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Day Five Part Three
"I be a sorry bird".
LM and CM Problems,
Revs 12 and 13

Journal Home Page

Day Five Part Five
Clearance for PDI - Again -
and Landing, Revs 15 and 16

Apollo 16

Day Five Part Four: Rendezvous and Waiting. Revs 13 to 15

Corrected Transcript and Commentary Copyright © 2006 David Woods and Tim Brandt. All rights reserved.

Last update: 2020-02-11

Start of Chapter and CM transcript


Report of CM SPS Servo Fault


Fault Investigation


Further Fault Investigation


Wave-off Decision


Loss of Signal (CM Transcript)


LM Transcript Starts


Loss of Signal (LM Transcript)


Resumption of Combined Transcript.
General Discussions


Start of Rev 14


Start of Rendezvous Manoeuvering


Acquisition of Signal.
Continued Rendezvous Manoeuvering


Loss of Signal
End of Chapter


[We rejoin Apollo 16 halfway through Rev 13, awaiting AOS]

Public Affairs Officer: This is Apollo Control at 98 hours, 5 minutes Ground Elapsed Time into the mission of Apollo 16. Three minutes and 50 seconds to aquisition of signal; that is, [for] the two spacecraft to come around the Moon on the 13th lunar revolution. Some 29 minutes, 24 seconds until ignition for the landing phase. Ignition time for PDI or Powered Descent Initiation is 98:35:04. The descent engine will burn for approximately 12 minutes 53 seconds. According to the nominal plan, for a total velocity change from orbital velocity all the way down to zero on landing at the lunar surface of 6698 feet per second [2,041 metres per second]. The Lunar Module Orion will slim down at a rate that would make a calorie counter envious for at the start of PDI, the Orion will weigh some 18 tons. By landing, she'll only weigh 9 tons. All of this weight loss, of course, is propellant. During the descent, the Lunar Module Pilot will be calling out numbers that the computer display has displayed for him. He will call them out to the Commander and both men will be in what is call a vox motor voice actuated communications so that those on the ground can hear their conversation. The Lunar Module Pilot will call out these numbers for the angle at which the Commander can see the landing site on a grid on his window called the Landing Point Designator. During the final descent phase of the touchdown, the Lunar Module Pilot will be calling out the landing radar readouts of H and H dot, that is altitude and descent rate respectively. The so-called low level of propellant quantities will be called out when the propellant quantities reach 5. 8 percent. At that time, the burn time remaining will be approximately 111 seconds - 91 seconds into this margin. There's a point called "Bingo". This is the point where the Commander has to make the decision to go ahead and land or to begin vertical motion and then abort stage in case it's a no-go situation on the landing. He has approximately 20 seconds to make this decision to land. The CapCom, in this case, Jim Irwin, or the Orion, will be make this call of level and Bingo to the crew at the appropriate times. Some 19 seconds away from predicted acquisition as Orion and Casper come around the Moon and Casper meanwhile will have circularized. 25 minutes, 47 seconds from ignition, We should have acquisition now. We're standing by for that.

Public Affairs Officer: It remains to be seen whether the steerable antenna on the Orion is functioning properly as we come around on Revolution 13. In any case, whether it works or not, we're still Go for landing at this point. Displays here in Mission Control have switched from the lunar orbit back ground projection plotters to the X-Y plotters of altitude, velocity and so on. Colored lines that are driven by radar, for the descent and landing phase. We have AOS on Lunar Module Orion. Let's switch on to air-ground.

098 11 13 Hartsfield: Casper, Houston. How do you read?

098 11 16 Mattingly: Okay; they're locking up on me. Hello, Houston. This is Casper Bar [?] now. We did not do [the] Circ [burn], and I'd like to talk about the TVC servo loops.

098 11 29 Hartsfield: Understand. No Circ.

098 11 33 Mattingly: That's affirmative. Presently, about a mile ahead of the LM. And I'd like to talk about a TVC servo loop problem.

098 11 51 Hartsfield: Okay, Ken. Go ahead.

098 11 55 Mattingly: Okay, and - and break in and tell me as soon as you get the DS - get ready to dump the DSE, so you can take a look at what I'm talking about, and I'll leave the antenna Manual and Wide until you do. Okay; the text is that we came up to the burn time and I was going through the gimbal checks. Number 1 servo started normally, checked out. I switched to - clockwise on the THC to perform the secondary gimbal check and started them - they looked normal. I set the pitch trim normally, and I went to set the yaw trim; I'd just been checking that the trim lock [?] worked, and I got divergent oscillations on the yaw trim indicator, and you could feel them in the spacecraft. So I switched to the - Servo Power to the Number 2 Servo to AC1/Main A, tried that. That had no effect. Then I cycled through looking at - at the gimbal - with the Auto Drive switch in Number 1, Number 2 in Auto. Every time I selected Number 2, by some means, I had the same results. Then I tried SCS in Auto, and as soon as I would excite some motion in the secondary yaw servo, why it would go unstable again. I then tried using the G&N to drive the gimbal, and I did the first half of the gimbal drive in Servo Loop 1, then switched to the Servo Loop 2 for the second half, and again the same instability showed up. Based on the [mission] rule of four servo loops, I canceled Circ. I had no other indications in the cockpit, no warning lights, no - no other abnormalities.

098 13 58 Hartsfield: Roger. We copy...

098 14 01 Mattingly: The [garble] was in fact running, but I don't think that could have had any effect when SCS was going.

098 14 10 Hartsfield: Roger. Could we get you to go to the AOS attitude, Ken, so we can dump the data?

098 14 20 Mattingly: Yes, sir. Will do.

098 14 25 Mattingly: How about if I just give you the high gain from right here?

[CM on board transcript ends until 099:16:32]

098 14 31 Hartsfield: Okay, if you think you can get it up.

098 15 30 Mattingly: Okay; I've got you a solid lock on the high gain.

098 15 40 Hartsfield: Casper, Houston. We'd like to verify that...

098 15 40 Mattingly (CM comm): I prefer this attitude, Hank, because I can keep the LM in sight.

098 15 41 Mattingly: [Garble] So I can keep the LM in sight.

098 15 54 Hartsfield: Casper, we'd like to verify that the - that the oscillations were on servo loop Number 2. Is that correct?

098 16 00 Mattingly: That's affirmative. Servo loop Number 2, yaw only.

098 16 08 Hartsfield: Roger. And servo loop Number 1 is okay?

098 16 11 Mattingly: That's affirmative.

098 16 18 Hartsfield: And did I read that the first time through the servo checks, they were okay? And then when you started to set the yaw trim, the oscillation started, and that once you had the malfunction, it occurred in...

098 16 31 Mattingly: No, sir. No, sir. Primary loop checked out normally. Secondary loop never checked out in yaw servo.

098 16 40 Hartsfield: Roger; copy. And that was both...

098 16 43 Mattingly: [Garble] started normally, and it's - Go ahead, Hank.

098 16 49 Hartsfield: Roger. And that occurred both in SCS and G&N, is that correct?

098 16 56 Mattingly: That's affirmative. And I tried both Auto and Rate Command in SCS.

098 17 21 Hartsfield: And, Ken, We'd like to confirm that was a divergent oscillation. Is that correct?

098 17 28 Mattingly: That's affirmative.

098 19 08 Hartsfield: Casper, Houston. We'd like for you to run another gimbal drive check in the yaw axis on both SCS and G&N, and let us take a look at it.

098 19 18 Mattingly: Okay; I'm prepared to do that right now if you're ready.

098 19 24 Hartsfield: Ready to go.

098 20 13 Mattingly: Okay; I'm bringing the Bus Ties on.

098 20 30 Mattingly: Okay, and ServoPowers 1 and 2 are on in the loop configuration. Are you ready for me to start the gimbals ?

098 20 41 Hartsfield: That's affirmative, Ken. Go ahead.

098 20 51 Mattingly: Okay, here comes - You just wanted to look at the yaw. Here comes Yaw number 2. There it is, and it's oscillating now, and it's damped out, and that's in Auto. I'll switch it to Number 2, and Number 2 in Auto. I'm now going to move the , and it - Well, now it's - there it goes - now it's oscillating, and it's divergent, and I'm turning the Gimbals Off. Okay, Yaw Gimbal Number 2 is Off. I'll hold this configuration.

[No conversation for 12 minutes]

098 32 45 Young (LM): Ken, is your transponder on?

098 32 50 Mattingly: That's affirmative. It is.

098 32 59 Duke (LM): Okay. We're gonna try our radar lockup here again.

098 33 07 Mattingly: Okay.

098 34 03 Mattingly: John, you want to try to initialize VHF ranging while we're above it?

098 34 35 Mattingly: Orion, Casper.

098 34 45 Mattingly: Would you like to try and check out our VHF at the same time?

098 34 49 Duke (LM): Okay.

098 35 02 Mattingly: Sounds very garbled. If you can read me, Orion, you're extremely garbled and making a pulsing-noise sound.

098 35 51 Mattingly: Orion, do you read me on B Duplex?

098 37 10 Mattingly: Orion, do you read Casper? Orion, do you read Casper?

098 37 31 Mattingly: Houston, Casper.

098 37 33 Hartsfield: Casper, Houston. Go ahead.

098 37 39 Mattingly: Roger. It looks like I'm losing comm with Orion. Could you ask them to go back to A Simplex?

098 37 45 Hartsfield: Wilco.

098 38 00 Duke (LM): Go ahead, Ken.

098 38 03 Mattingly: Okay, you were just about unreadable. I don't know if you could pick me up on that other configuration, but that didn't work at all. Yeah, but it was coming through completely garbled - unintelligible. Okay. Okay; and if no voice in 30 seconds, we'll come back to A Simplex. Okay, how do you read me now? You're still very scratchy, hardly make you out at all. Yeah, that's pretty bad. That's not much better; it's not near like what we got before. Let's go back to A Simplex.

098 39 16 Mattingly: Hey, you sound good now.

098 40 00 Mattingly: Hey, Charlie.

098 40 18 Mattingly: Okay, you want to turn your light on when it gets dark? And how about let's try a little ranging here, before we go into the darkness?

098 40 25 MCC: [Garble] CapCom...

098 40 26 Mattingly: ...comm now - you're on - on configuration for ranging.

098 40 30 MCC: Hey - am I - Hey, Gerry, am I on your loop? Okay. Hey, on - on this conversation here, I ran this rendezvous from the miniball.

098 40 45 Mattingly: Hey, Stuart, you're on air-to-ground.

098 40 48 MCC: Sorry about that, Ken.

098 40 51 Mattingly: Hey, Charlie, let's - hey, Charlie, how about let's try out this ranging? You're in the ranging configuration, right? Okay, stand by for about 30 seconds until I try to lock up.

098 41 34 Mattingly: Okay, I've got you at 0.36; 0.38; 0.36, bouncing around. How does that compare? It doesn't really.

098 25 24 Mattingly: Gee, I think so. Might as well keep an eye on it, looks like we're getting ready to go in the dark here. Could you wait until we get in the dark so I can look at you? Right now, I've got the Sun right smack in my eyes.

098 45 40 Mattingly: Did you get any words out of Houston? I haven't heard a word from them.

098 45 50 Hartsfield: Casper, Houston. We're working on a problem down here.

098 45 57 Mattingly: Roger, Henry. I understand that; but I'm not bugging you. We'll stay off the loop.

098 46 02 Hartsfield: Okay, we've got the data down, and we've got the strip charts, and we' re taking a look here and see if we can't find some way to get around it.

098 46 11 Mattingly: Okay. I know if there's a way, you'll find it.

Public Affairs Officer: This is Apollo Control. There's a rather busy huddle around the Flight Director's console here at Mission Control as all the options for the current situation in the mission are considered. Shall we continue to troubleshoot the problem with the Command Service Module Stabilization [and] Control System or shall we proceed with re-rendezvous and a Trans-Earth Injection burn at several hours hence. The possibility is still open for troubleshooting the problem with the system that controls the Service Propulsion System, and just landing at a later time. We are hopeful that before Loss of Signal on this 12th revolution of Apollo 16 that the decision will be made. At 98:46, this is Apollo Control.

098 48 03 Mattingly: Stand by a second.

098 48 12 Mattingly: Was doing temporary battle with our friend, the trash bag. I have you, visual. Tally ho.

098 48 39 Mattingly: Okay. I'll keep you in sight.

098 49 09 Mattingly: That old probe is really nice.

098 50 43 Hartsfield: Casper, Houston.

098 50 48 Mattingly: Go ahead, Houston.

098 50 50 Hartsfield: Okay. We're getting set up for another gimbal drive check, Ken, and what we want to do is go through a complete gimbal drive check by the numbers, and have you tell us as you do each thing and especially in relation to the - the yaw thumb-wheel, which way you're moving it and how many degrees and - and what's happening. And we'll give you the word when we're ready to start that. We've got to get some things configured down here.

098 51 16 Mattingly: Okay. Was attitude - How about looking ahead to see if this attitude is going to hold throughout the test?

098 51 23 Hartsfield: Okay, I'll check it.

098 51 27 Mattingly: Thank you.

098 51 33 Hartsfield: The attitude is good, Ken.

098 51 38 Mattingly: Okay.

098 54 10 Hartsfield: Okay, Ken. We're ready to go. Do you think VOX might make it easier for you?

098 54 20 Mattingly: Yes, sir. I'll go to VOX now and, Orion, are you still working on your [P]52?

098 54 31 Mattingly: Okay. I'm going to have my head in the cockpit here for a while, but if Mr. Kepler isn't a high school dropout, why, we won't hit anyhow.

098 54 46 Mattingly: Okay, Houston. Here we go. I'm gonna run over the switch configuration that I've got in the cockpit. We're going to do this - everything except calling P40, or do you want to call P40 for something?

098 55 01 Hartsfield: We don't need P40.

098 55 03 Mattingly: [Garble] you do not want P40. Okay, here we go. I got - The circuit breakers are all checked over on Panel 8. The only ones that are out are RCS Logic, the Probe, and the stuff on the bottom rows that don't matter. Okay. The switches for SCS are in Limit Cycle, Off; Dead Band, Min; Rate, Low. I've got the Rotation Power at AC. Direct are Off. I've got my BMAGs. I'm going to ungag them now. They're ungagged. I'm going to SCS Control. Okay. Now I'm going over and catch the - the bus ties. Here comes Bus Tie, AC. It's On. EC is On. Gimbal power Number 1 to AC 1, number 2 to AC 2. Start Pitch Gimbal Number 1.

098 56 14 Mattingly: Mark. And Yaw Gimbal number 1.

098 56 19 Mattingly: Mark. I have a thumb-wheel drive. I'm driving it from zero to minus one-half to plus one-half, which is the trim. The Yaw thumb-wheel is at plus one half. I'm going to take it to zero and back up to 1, and will set it at 122. It runs smoothly in both directions. I'm making an MTVC check in Pitch. There's a little plus Pitch, a little minus Pitch - that's good - a little minus Yaw, a little plus Yaw. That's good and stable. I'm going to CMC Control.

Public Affairs Officer: This is Apollo Control. Aboard the Command Module, Ken Mattingly is troubleshooting the SCS reading out what his onboard indications are. Let's listen to that for awhile, and switch away from Orion.

098 56 55 Mattingly: Mark. I have no MTVC. I'm going clockwise on the translation hand controller.

098 57 01 Mattingly: Mark it. I still have no MTVC. I'm bringing on the Pitch 2 Gimbal -

098 57 08 Mattingly: Mark. I'm checking the thumb-wheel down to zero, up to 1, back to one-half. The Yaw thumb-wheel is going over to [garble] and I don't - Let me try it again. There it goes. Had the Motor on; now I'm turning it Off. I'll turn it on one more time. [garble] it's stable. I'm taking the trim, which is now set at a little over 1 on the thumb-wheel, down towards zero. I move it slowly. It gets a little dynamics, and then it stops. I'm going to take it down to zero at about this rate. It oscillates, and now it's diverging, and I'm turning the Gimbal Motor Off. I'm going to hold in this configuration.

098 57 54 Hartsfield: Roger. Copy.

098 59 13 Hartsfield: Ken, what we would like for you to do now is crank up the Yaw 2 Gimbal again to that stable condition, and then let's see what MTVC does to it - see if that will excite the oscillation.

098 59 28 Mattingly: It did last time. I now have the Gimbal on again, and I'm going to give it a little Yaw, and there it goes. Coming Off -

098 59 36 Mattingly: Mark.

098 59 38 Hartsfield: Roger. Copy.

098 59 49 Mattingly: Would you like to take a look at it in Accel Command?

098 59 53 Hartsfield: Stand by.

098 59 59 Mattingly: Understand. Stand by.

099 00 04 Hartsfield: Roger. Ken, go ahead and let's try it in Accel Command.

099 00 15 Mattingly: Okay, and it's diverging all on its own in Accel Command. I didn't put any inputs into it.

099 00 22 Hartsfield: Roger. Copy.

Public Affairs Officer: This is Apollo Control 99 hours and 1 minute Ground Elapsed Time. Flight Director Gerry Griffin is instructing the two spacecraft communicators to brief the crew on the current situation. And which apparently we have as long as five lunar orbits to make a determination on the feasibility of continuing with the landing, or whether we'll have to rendezvous with the two spacecraft back together, and do an immediate return to Earth. Assuming that the Service Propulsion System would be inoperative. We're some 14 minutes away from Loss of Signal with the Command Module. We will monitor the discussion between the spacecraft communicator, and the crew Orion, and Mattingly in Casper.

099 02 38 Hartsfield: Hello, Orion and Casper. This is Houston.

099 02 47 Hartsfield: Roger. It looks like we're not going to have a decision on this rev, and we do have the capability of spending about five revs in this configuration before we have to make that decision. We would like y'all to move into a station-keeping position, and you should be at the closest point of approach at about 100 hours, and we're recommending a CSM active to move into a position and to station-keep. And we're gonna run some simulations down here on this TVC problem, and we'll get back to you.

099 03 32 Hartsfield: Casper, this is Houston. You copied, too, didn't you?

099 03 37 Hartsfield: Okay.

099 03 38 Mattingly: Roger. I'm with you. I still have the - some of the gimbal motors on and the bus ties. Want to stand by on that?

099 03 43 Hartsfield: Okay, Ken. We'd like to try one more thing. There's a remote possibility that the RHC may be inducing some noise or transients into the system. We'd like you to kill all power to the RHC. Cut off both AC and DC, and repeat the gimbal check in AC Accel Command and see if the gimbal takes off.

099 04 09 Mattingly: Okay. I've got - I secured the hand controller by just taking Normal 2 Power to Off, and the rest of the Powers were Off. I'm in Accel Command on Yaws and I'm going Number 2 up to Start, and it's in Accel, and it's stable. Would you like for me to try the thumbwheels?

099 04 34 Hartsfield: Stand by one.

099 04 35 Mattingly: And with a little excitation from the thumb-wheel, it took off again.

099 04 39 Hartsfield: Roger. Understand.

099 05 09 Hartsfield: Ken, for that rendezvous, we're suggesting you use the procedure you worked on there in the simulator, just move it in, and when you're that close, you approach.

099 05 19 Mattingly: Okay, Hank. Will do that. Thank you.

099 05 23 Hartsfield: Let me see if there's anything else they want to do with this gimbal thing before we shut it down? Stand by one.

099 07 30 Hartsfield: Casper, Houston. We'd like for you to try, for our data, one more Yaw primary - Yaw secondary G&N servo loop check - gimbal check.

099 08 09 Mattingly: Henry, did you say primary and secondary on this G&N drive?

099 08 14 Hartsfield: Negative. Just - just the secondary loop. I didn't mean to say primary.

099 08 21 Mattingly: Okay. Can I turn the other three gimbal motors off?

099 08 27 Hartsfield: Say again. You were blocked out.

099 08 32 Mattingly: I say, I'd like to turn the other three gimbal motors off if we don't need them.

099 08 37 Hartsfield: Roger. Go ahead and turn those off.

099 08 50 Mattingly: Okay. I'm now in - I'm in S - in CMC Control. I'm setting up 204, and I have program 509 loaded. I'm starting Gimbal number 2 Yaw. Okay. It's stable now. I'm going to do a Proceed on 204.

099 09 16 Hartsfield: Roger.

099 09 49 Mattingly: Well, doesn't look like I got anything that time.

099 09 52 Hartsfield: I suspect you've got to be in G&N or CMC Control, haven't you?

099 10 01 Mattingly: Okay. Let's try it again. Go back over everything.

099 10 30 Mattingly: Okay. I'm coming up. I'm going to start it again. I'm going to try it. Now, as soon as I turn - Well, by golly, it - it damped itself there, it started out wild, and it's settled down. Now I'm going to Proceed on 204.

099 10 45 Hartsfield: Roger.

099 09 53 Mattingly: Plus two, and it's oscillating. Minus two, and it's oscillating about one degree each, and it's oscillating in the center, it is not divergent, however. Well - now it's gone to trim, and it's oscillating about plus or minus - almost two degrees - or plus or minus one degree. I'm going to turn it Off...

099 11 14 Mattingly: Mark.

099 11 19 Hartsfield: Roger. Copy.

Public Affairs Officer: This is Apollo Control at 99 hours, 11 minutes into the mission of Apollo 16. To recap the current situation, the crews of both vehicles Casper and Orion have been instructed to station-keep as they come to their closest approach during the next pass behind the Moon, with the Command Service Module being active in the rendezvous. We have some five hours to resolve the current problem which consists of difficulty by Ken Mattingly in getting the Thrust Vector Control System which keeps the Service Propulsion Engine aligned through the center of gravity on the Command Service Module. At the same time people on the ground, here in Mission Control and over in the Training Building are running simulations to attempt to develop a bypass or a workaround for the situation that Ken Mattingly has encountered and as preparations for the circularization burn. Some three minutes away from Loss Of Signal.

099 12 14 Hartsfield: Casper, Houston. You can go ahead and shut down the gimbal motors, and turn off the TV servo loops - TVC servo loops, and clean it up.

099 12 26 Mattingly: All right, sir. I'll power down. Thank you.

Public Affairs Officer: This is Apollo Control. One slight correction. We have five revolutions which amounts to ten hours in which to make the decision before the geometry of the two spacecraft orbits would dictate no landing, would be out of plane with the landing site beyond the capability of the Descent Propulsion System to steer into the landing site. To repeat again, that is five revolutions instead of five hours.

099 13 12 Hartsfield: Casper, Houston. I've been advised that the average g kills your EMP.

099 13 23 Mattingly: Okay. Thank you.

099 14 48 Hartsfield: Casper, Houston. We're about two minutes from LOS, and when you come around next time, in that rendezvous, just come up on the best omni, and then we'll get high gain from there.

099 15 02 Mattingly: Okay, Hank. And is there anything else you can think of we can do - we might try and take a look at? Otherwise, we'll just be station-keeping so.

099 15 18 Hartsfield: We can't think of anything else down here, Ken.

099 15 25 Mattingly: Okay. Thank you, sir. See you in a few minutes.

099 16 35 Hartsfield: Ken, for your info, we up-linked a new vector to the the LM, and we weren't able to get yours in. So there will be a small difference - a couple feet per second.

099 16 45 Mattingly: Okay.

[Loss of Signal. Casper's onboard transcript restarts at 099:16:32]

[Now for Orion's communications, restarting from 098 10 38]

098 10 49 Irwin: Orion, this is Houston; I'm reading you. We want you to stay with the omni antenna.

098 11 11 Irwin: Orion, this is Houston. How do you read?

098 11 44 Irwin: Orion, this is Houston. How do you read?

098 11 54 Duke (LM onboard): Okay; yaw around to - yaw to zero.

098 11 58 Young (LM onboard): Yaw - yaw what?

098 12 04 Duke (LM onboard): Yaw right a little bit.

098 12 11 Young (LM onboard): Why?

098 12 13 Duke (LM onboard): So we can get a better - better lock on them.

098 12 13 Irwin: Orion, this is Houston. How do you read?

098 12 15 Mattingly (CM comm): [Garble] checked out. I switched to...

098 12 18 Young (LM onboard): Loud and clear.

098 12 20 Mattingly (CM comm): ...[garble] the THC to perform the secondary gimbal check [garble] normal. I set the pitch trim normally, I went to set the yaw trim; and [garble] that the trim would not work and I got divergent oscillations on the yaw trim indicator, and you can feel them in the spacecraft. So, I switched to the...

098 12 44 Duke (LM): Hey, Ken. Go off VHF please.

098 12 45 Mattingly (CM comm): ...the number...

098 12 46 Duke (LM onboard): All we got to do is -

098 12 47 Young (LM onboard): Huh?

098 12 49 Duke (LM onboard): Turn yours off, man.

098 12 51 Young (LM onboard): Huh?

098 12 52 Duke (LM onboard): Turn it off over there.

098 12 58 Young (LM): Houston, Orion. Over.

098 12 60 Irwin: Orion, this is Houston. We read you rather weak. How do you read us?

098 13 06 Duke (LM): Roger; you're five by five. And Command Module did not reach Circ. And we're standing by to - for y'alls' decision with him. Over.

098 13 15 Irwin: Roger. Understand you standing by. We want you to stay with the omni and we'll be requesting high bit rate shortly.

098 13 24 Duke (LM): Roger.

098 13 26 Irwin: And we're ready for high bit rate now.

098 13 28 Duke (LM): Did you copy? No Circ.

098 13 29 Irwin: We copy, no Circ.

098 13 33 Young (LM): Okay; you have high bit rate.

098 13 34 Young (LM onboard): You hear that noise?

098 13 35 Irwin: Okay. I anticipate a waveoff for this one. We'll set you up for the next one.

098 13 42 Young (LM): Okay.

098 13 46 Duke (LM onboard): Yeah, What is that noise? Huh?

098 13 50 Young (LM onboard): I don't know either. Engine Arm, Off, Master Arm, Off, P00, Landing Radar is Off, Ascent Bats, Off.

098 13 57 Duke (LM onboard): They are.

098 13 58 Young (LM onboard): Propellant Quantity Monitor, Off.

098 13 59 Duke (LM onboard): It is.

098 14 00 Young (LM onboard): We never turned it on. Audio to PTT.

098 14 03 Duke (LM onboard): It is.

098 14 04 Young (LM onboard): ECS to Cabin mode.

098 14 05 Duke (LM onboard): It is.

098 14 06 Young (LM onboard): Helmet and gloves off, AGS to Att Hold.

098 14 08 Duke (LM onboard): It is.

098 14 09 Young (LM onboard): Align IMU, P52, same stars.

098 14 19 Duke [Young in LM transcript](LM): Okay, Ken's right out in front of us, maybe about a - 600 feet [180 metres], so we have a visual on him.

098 14 25 Mattingly (CM comm): How about if I just give you the high gain from right here?

098 14 27 Duke [Young in LM transcript](LM): So we have a visual on him.

098 14 32 Irwin: Okay. We copy.

098 14 34 Young (LM): What attitude do you want us to go to for bit.

098 14 38 Duke (LM onboard): I think you can stop it right now.

098 14 40 Young (LM onboard): I'm -

098 14 41 Irwin: Stay right where you are, John. You're coming - comm's fairly good.

098 14 46 Young (LM): Okay.

098 14 49 Irwin: Orion, will you confirm forward omni?

098 14 56 Young (LM): Roger. That's what you have, forward omni.

Public Affairs Officer: Lunar module Orion has been advised of the possibility of a wave-off for landing on this revolution. It seems that the circularization burn on the Command Module Casper was unsuccessful.

098 15 40 Mattingly (CM comm): I prefer this attitude, Hank, because I can keep the LM in sight.

098 15 52 Young (LM onboard): Let's try that rendezvous radar lockup again, Charlie.

098 15 55 Duke (LM onboard): Okay.

098 15 57 Young (LM onboard): I don't understand why it didn't work. Do you?

098 15 58 Duke (LM onboard): No.

098 16 18 Duke (LM onboard): It's good, John.

098 16 21 Young (LM onboard): It got him, hadn't it?

098 16 22 Duke (LM onboard): Yeah. Go Auto Track.

Primary loop checked out normally. Secondary loop never checked out in yaw servo. The motor started normally, and it's - Go ahead, Hank.

098 16 58 Irwin: Orion, this is Houston. We'd like you to go back to normal RCS configuration.

098 17 07 Young (LM): Roger.

098 17 08 Young (LM onboard): Normal RCS config, Charlie; whatever that means.

098 17 15 Duke (LM): Jim, be advised we had a couple of RCS Reg A lights on the back side, and flipping the system - it went out.

098 17 30 Duke (LM onboard): I think he's probably just about out of Mode - Mode 1 limits, John.

098 17 33 Young (LM onboard): Yeah, I think that's what it is.

098 17 33 Irwin: Roger. We copy, Charlie.

098 17 49 Young (LM onboard): Well, the heck with it.

098 17 51 Duke (LM onboard): Wait a minute. Let me park the antenna where it should be.

098 17 57 Young (LM onboard): Plus all balls? No, you - there you go, plus.

098 18 25 Young (LM onboard): Okay.

098 18 26 Duke (LM onboard): Let me pull the breakers.

098 19 12 Young (LM): Houston, how do you read. Over?

098 19 17 Irwin: Orion, this is Houston. Read you loud and clear.

098 19 19 Mattingly (CM comm): Okay; I'm prepared to do that right now if you're ready.

098 19 22 Duke (LM): Okay. I don't think we're going to have a - remeeting problem here, but we're pointed right at him and as I look at him on my LPD - Ken is out at 46 degrees and about - oh, I'd say 800 or 900 feet, maybe a thousand.

098 19 55 Irwin: Roger. Can you see those booms that had the problem?

098 20 01 Duke (LM onboard): They're all retracted. Everything's retracted.

098 20 05 Duke [Young in LM transcript] (LM): Everything is retracted in the SIM bay.

098 20 09 Irwin: Okay, we copy.

Public Affairs Officer: This is Apollo Control. We are going around at least one more rev before attempting the Power Descent Initiation for Lunar Module Orion. Ken Mattingly in Command Module Casper encountered some problems in preparing for the Service Propulsion System burn for the circularization maneuver. Seems that a secondary circuit on the Thrust Vector Control System apparently did not come up to specifications. So the circularization burn was aborted, and we have a wave-off. We'll stand by for the remainder of this front-side pass as a new circularization burn maneuver is calculated, and troubleshooting continued for Ken Mattingly and his problem aboard Casper.

098 23 12 Young (LM onboard): There's nothing we can do, Charlie. You think?

098 23 18 Duke (LM onboard): Up to them. Let's see the book.

098 24 26 Young (LM onboard): You want - you say you want to go ahead and try it without - without the - without the loops? What do you think?

098 24 31 Duke (LM onboard): I don't think they do. I bet you they don't.

098 26 13 Young (LM onboard): You never can tell, Charlie.

098 26 15 Duke (LM onboard): What?

098 26 16 Young (LM onboard): What they'll do. Sock, me a little water.

098 26 24 Duke (LM onboard): Okay.

098 26 34 Young (LM onboard): That's fine. Thank you.

098 27 21 Duke (LM): Houston, 16.

098 27 23 Irwin: Okay, go ahead, 16.

098 27 24 Duke (LM): All right, Jim. You guys working on some more pads and stuff for us?

098 27 32 Irwin: Oh, yes, we are, Charlie, and when you get a chance we'll take your AGS cal, if you have those.

098 27 39 Duke (LM): Yes, sure do. Stand by.

098 27 44 Young (LM): We'd like to pitch down to keep Ken in sight. Is that possible?

098 27 49 Irwin: Okay, you're clear.

098 27 55 Duke (LM): Okay, starting with 540, minus 008, plus 001, plus 002, plus 006, plus 05 - correction plus 045, minus 088, and the initial numbers were the same as on the Data Card Book.

098 28 14 Irwin: Okay, beginning, it was a readback, beginning at 540, minus 008, plus 001, plus 002, plus 006, plus 045, minus 088, and the initial values were the same as on the card. Over.

098 28 33 Duke (LM): That's affirmative.

098 28 36 Irwin: Okay. And on your RCS situation, we suspect that the burst disk went back side. We'd like to make sure that the System A pressure, when the source pressure in System A gets down to 500 psi, we'd like you to close off System A. Over.

098 28 56 Duke (LM): Roger.

098 28 57 Young (LM onboard): What is it now, Jim?

098 29 07 Duke (LM): When you say source pressure, you mean helium?

098 29 09 Irwin: Affirmative.

098 29 13 Duke (LM): Okay, Jim, the helium is holding right up there. It's 2400 and that was where it was before we started getting those RCS lights. The pressure never has gone above about the 205, 210 maybe.

098 29 27 Irwin: Okay, we copy.

098 29 42 Duke (LM onboard): But it's RCS problem. The comm problem.

098 29 46 Young (LM onboard): The radar problem.

098 29 48 Duke/Young (LM onboard): And the gimbal problem.

098 29 58 Young (LM onboard): They're liable to shoot us down on numbers alone.

098 30 00 Duke (LM onboard): Yeah.

098 30 04 Young (LM onboard): Man, I'm ready. I'm ready to go down and land. I think that'd really be neat.

098 30 47 Duke (LM onboard): I bet we dock and come home in about three hours.

098 31 55 Duke (LM): - Jim, give us a call when you want us to go to Aft omni.

098 31 58 Irwin: Roger. We sure will, Charlie.

098 32 20 Duke (LM): You got any LOS time for us?

098 32 39 Young (LM onboard): 300 hours in the pressure suit.

[LM transcript ceases until 099:22:56]

098 32 45 Young (LM): Ken, is your transponder on?

098 32 53 Duke (LM): Okay.

098 32 59 Duke (LM): Okay. We're gonna try our radar lockup here again.

Public Affairs Officer: This is Apollo Control here in Mission Control. All of the options are being considered with the current situation in which the Thrust Vector Control portion of the Stabilization and Control System, which in turn controls the firing and gimbaling of the Service Propulsion System engine. It's being mulled over. The other options would be rendezvous over the next couple [of] revolutions and possibly using the Descent Propulsion System onboard Orion for injecting the spacecraft back into a trans-Earth trajectory. Over the next several hours this consideration should sort itself out.

098 34 34 Irwin: Okay, Orion. Let's go Lo bit rate.

098 36 37 Irwin: Orion, will you go Hi bit rate, again?

098 36 41 Irwin: Orion, go Aft omni.

098 36 48 Young (LM): We have Aft omni, Jim.

098 36 50 Irwin: Roger.

098 37 33 Irwin: Orion, go Lo bit rate.

098 37 35 Young (LM): We have Lo bit rate.

Public Affairs Officer: This is Apollo Control at 98:37. The current situation in Apollo 16 is a wave-off. That is another revolution before attempting a landing.

098 37 50 Duke (LM): We have an RCS Reg A light, Jim. We're going to [garble].

098 37 52 Irwin: Orion, go A Simplex, Ken's trying to call you.

Public Affairs Officer: However as mentioned earlier other options are being looked at in case the trouble shooting on the Command Module - Command Service Module Stabilization and Control System fails to pan out to where the circularization burn or any other Service Propulsion System burns could be conducted successfully.

098 38 00 Duke (LM): Go ahead, Ken.

098 38 31 Irwin: Orion, go Forward omni.

098 38 34 Irwin: Orion, Forward omni.

098 41 40 Duke (LM): Hey, that sounds pretty good. Houston, how do you read Orion? Over.

098 41 48 Irwin: Read you loud and clear, Orion.

098 42 47 Young (LM): Houston, this is Apollo 16 [garble]. PDI. We'd like to try.

098 42 56 Irwin: Orion, this is Houston, if you're calling.

098 43 02 Young (LM): Roger. We wonder if there is any possibility of an answer on - We're going to do a P52 and get ready for another PDI. Over.

098 43 21 Irwin: Stand by. We'll tell you.

098 44 10 Irwin: Okay. Orion, this is Houston. You can go ahead with your P52, John, we're thinking of having you all try to get back closer together on the back side if your - point of approach. And we'll have some more words to you on that. And if later we decide for the PDI, we'll have another procedure for you.

098 44 36 Young (LM): Okay. Understand.

Public Affairs Officer: This is Apollo Control. Spacecraft communicator Jim Irwin in the next few moments should pass up to the crew of Orion what the current thinking is here in the Control Room on attacking the problems that have arisen in the Apollo 16 mission.

098 49 59 Duke (LM): Houston, I gave you Aft omni.

098 50 29 Irwin: Orion, go Aft omni.

098 50 33 Duke (LM): Orion is in Aft omni.

098 50 36 Irwin: Roger. Copy.

098 52 26 Irwin: Orion, go Forward omni.

098 54 29 Young (LM): [Garble] registering 10.

098 54 43 Young (LM): Yeah, the ... was off 10.

098 58 35 Irwin: Orion, go Aft Omni.

098 58 40 Duke (LM): Orion, Aft Omni.

099 02 40 Irwin: Hello, Orion and Casper. This is Houston.

099 02 46 Young (LM): Go ahead, Houston.

099 02 47 Irwin: Roger. It looks like we're not going to have a decision on this Rev, and we do have the capability of spending about five rev's in this configuration before we have to make that decision. We would like y'all to move into a station-keeping position, and you should be at the closest point of approach at, about 100 hours. And we're recommending a CSM active to move into a position and to station-keep. And we're going to run some simulations down here on this TVC problem, and we'll get back to you.

099 03 22 Duke (LM): Roger.

099 03 30 Irwin: Casper, this is Houston. You copied, too, didn't you?

099 03 34 Duke (LM): Roger. He reads you.

099 03 35 Irwin: Okay.

099 05 16 Duke (LM): Go ahead.

099 06 04 Duke (LM): That -

099 06 56 Irwin: Orion, this is Houston. We want to try another procedure here to improve our comm. We want you to select Secondary Power Amplifier.

099 07 08 Duke (LM): Okay, [garble] Secondary Power [garble].

099 08 25 Irwin: Orion, this is Houston. Will you confirm that you changed power amplifiers?

099 08 32 Duke (LM): That's affirmative.

099 08 36 Irwin: Roger. Copy.

099 09 07 Irwin: Orion, let's go Hi bit rate.

099 09 27 Duke (LM): You have Hi bit rate.

099 09 28 Irwin: Roger.

099 10 23 Duke (LM): Hey, Jim; Orion. Could we close off main B in this system A?

099 10 30 Irwin: Stand by.

099 10 35 Irwin: Orion, we're happy with your present RCS configuration.

099 12 22 Irwin: Orion, this is Houston. And if - you're in P00; if you'll go to Data, we'll send you a state vector. Over.

099 12 34 Young (LM): Roger. You have it. Go ahead.

099 12 35 Irwin: Roger.

099 15 01 Irwin: And, Orion, we're 2 minutes from LOS.

099 15 17 Duke (LM): Copy, Jim. And we're going to - Updata Link to Off.

099 15 43 Irwin: Orion, we're finished with your computer.

099 15 49 Duke (LM): Roger. Thank you much.

[The LM transcript restarts at 099:23:02]

Public Affairs Officer: This is Apollo Control. We've had Loss Of Signal near the end of the 13th lunar revolution as both spacecraft go around the back of the Moon. Flight Director Gerry Griffin is having what he calls a "tag up" with all of the console positions here in the Control Center for a discussion of the current situation in Apollo 16. We've had a wave-off so far. That is the current posture of the mission. Crew will rendezvous at the next closest approach time and station-keep until such time as the resolution is made here on the ground whether or not to continue the mission or to re-rendezvous, dock and do an immediate Trans-Earth Injection burn. They're attempting to work around the problem and the Command Service Module thrust vector control circuitry, which apparently bombed out on Ken Mattingly when he was preparing for his circularization burn. We have some five revolutions in which the decision can be made before it would be a definite no-go for landing. At 99:18, and 46 minutes away from acquisition on Rev 14, this is Apollo Control.

[We start with just under six minutes of CM transcript]

099 16 32 Young (CM onboard): [Garble] the CSM to be active [garble]. They want [garble]. Oh, this one must be - Yeah, this is RCS [garble]...

099 16 44 Mattingly (CM onboard): Okay.

099 16 46 Young (CM onboard): Yeah, they - yeah, but they must want the CSM to be active on the [garble]. What is the [garble]? [garble] go down there [garble]. Can't [garble] these burns [garble]. It's very expensive to try to keep [garble].

099 17 18 Duke (CM onboard): Okay, Ken. We're gonna lock on to the landing rad - to the rendezvous radar, and are you just gonna move in with RCS?

099 17 26 Mattingly (CM onboard): Yeah. I think I'll [garble].

099 17 31 Duke (CM onboard): You're pretty garbled.

099 17 34 Mattingly (CM onboard): [Garble]. Can you read me now, Charlie?

099 17 38 Duke (CM onboard): Yeah, we - we read you.

099 17 40 Young (CM onboard): You sound like you're talking through about six feet of grits.

099 17 47 Mattingly (CM onboard): I don't think that's what it is right now.

099 17 53 Young (CM onboard): That's [garble] all that stuff? Oh, man. [garble].

099 18 33 Young (CM onboard): Makes you think that the [garble] valve [garble][garble] landing radar, Ken. Pick me up [garble].

099 19 06 Young (CM onboard): Look at that.

099 19 08 Duke (CM onboard): What?

099 19 09 Young (CM onboard): Already lost some of it.

099 19 13 Duke (CM onboard): This was pretty good flight.

099 19 17 Young (CM onboard): Going down.

099 19 32 Duke (CM onboard): Got time for this [garble]? It has - it's got a main [garble] minus something.

099 19 47 Young (CM onboard): Well, it will be here pretty quick, Charlie. [Garble].

099 20 07 Young (CM onboard): That's 20 minutes. I don't think we'll ever agree on that, though; okay?

099 20 13 Duke (CM onboard): Okay. Let's try [garble].

099 20 16 Young (CM onboard): Okay.

099 20 38 Young (CM onboard): [Garble] there and [garble].

099 21 06 Mattingly (CM onboard): Okay, [garble] lock up on the radar [garble]. Okay, Charlie.

099 21 12 Duke (CM onboard): We're not locking up. We're gonna say that we don't want to do it for this, Ken.

099 21 18 Mattingly (CM onboard): [Garble] plans.

099 21 25 Young (CM onboard): Okay.

099 22 22 Mattingly (CM onboard): [Garble] flight [garble].

099 22 34 Mattingly (CM onboard): [Garble] oh, okay [garble] try to [garble].

099 22 55 Mattingly (CM comm): I didn't get a chance to follow all the things [garble]. Do you have any problems or anything?

[LM transcript restarts and is combined with the CM one from 101:10:46]

099 23 02 Duke (LM comm): We got a RCS problem, but it's not too bad. And, otherwise, we're okay. We can't get our steerable antenna up.

099 23 21 Mattingly (CM comm): You don't need that now, do you?

099 23 22 Duke (LM comm): No.

099 23 23 Mattingly (CM comm): Can you land on omni?

099 23 25 Duke (LM comm): Yeah, we can land on omni. How does that thing look to you, Ken? Is it unstable everywhere?

099 23 30 Mattingly (CM comm): Yes, sir. There's no question about it. I - any - any force at all that moves at all makes it go unstable. Looks like feedback in the control.

099 23 41 Duke (LM comm): Is that Main B? Is it run off Main B?

099 23 44 Mattingly (CM comm): Yeah. But I don't think that - it's not likely that I wouldn't have done that, I wouldn't think. They - they told me after - I guess it was after you guys had left that they went back and looked at the dumps and found that we happened to hit all the heaters at one time.

099 24 00 Duke (LM comm): Ah so. Well, I never did think it was a good idea to run those gimbal motors that long.

099 24 13 Mattingly (CM comm): Well, I guess they're having some of those kind of thoughts right now, too.

099 24 19 Duke (LM comm): Yeah. Those once in a million problems like that coarse align, and everybody gets boresighted on it.

099 24 33 Mattingly (CM comm): Well, I guess we really need to wait and see [garble] really want. You never know, those guys might come through here and find a way to take you down. Thought that it would hold its position with an external force on it, we could control the problem pretty good by using the - just using the proper trims to start the burn.

099 24 59 Duke (LM comm): Yeah.

099 25 01 Mattingly (CM onboard): But if you just count on the external forces not moving it, then I don't know what you do. I was thinking maybe we could use it in Accel Command with - just set the proper trim and immediately go to SCS and Accel Command, point it the right direction.

099 26 18 Young (LM onboard): [Garble] that pulse. [Garble]

099 26 25 Young (LM onboard): You sleeping?

099 26 27 Duke (LM onboard): Was I sleeping? I was almost asleep.

099 26 37 Young (LM onboard): I bet my bride is beside herself.

099 26 41 Duke (LM onboard): Yeah.

099 27 12 Duke (LM onboard): Well, we'll be two revs late, but we'll do it.

099 27 16 Young (LM onboard): I hope you're right.

099 27 28 Young (LM onboard): We ain't gonna do any EVA today, either.

099 27 30 Duke (LM onboard): You don't want to?

099 27 32 Young (LM onboard): Not for two revs, Charlie. Let's do it tomorrow and do the full thing.

099 27 54 Young (LM onboard): What's it do, bend?

099 27 59 Duke (LM onboard): Probably the first dish, yeah.

099 28 34 Duke (LM onboard): He's dropping down out the bottom of the window.

099 26 54 Mattingly (CM comm): We're now passing right [garble] through Scorpio.

099 28 58 Young (LM comm): Yep.

099 29 00 Mattingly (CM comm): Did find out that once we got the LM off there that the - we'd be able to see it a lot better. I guess the telescope just wiped out the [garble] the LM.

099 29 39 Mattingly (CM comm): What's the limitation of how long you can stay before - you can't go down?

099 29 44 Young (LM comm): Five revs.

099 29 46 Mattingly (CM comm): No, I mean what's the limiting factor? Is it water?

099 29 49 Young (LM comm): No. We got plenty of water.

099 29 51 Duke (LM comm): We could - we can land and just do a couple of EVAs.

099 29 56 Mattingly (CM comm): I just wondered what - how they came up with five revs - was it water or what [garble]?

099 30 02 Young (LM comm): Got no idea.

099 30 03 Duke (LM comm): I don't know.

099 30 13 Duke (LM comm): Light still on?

099 30 16 Young (LM comm): Yeah, ours is.

099 30 18 Duke (LM comm): No, I mean the RCS light.

099 30 26 Young (LM comm): What's the pressure?

099 30 29 Duke (LM comm): It's 210.

099 30 47 Duke (LM comm): I think we got enough ullage in there, in the tanks to -

099 30 55 Young (LM comm): Just let it go? It's not firing anymore?

099 31 02 Duke (LM comm): Well, I don't know.

099 31 13 Duke (LM comm): I don't think we ought to fire anymore.

099 31 33 Duke (LM comm): It's probably that thermal blanket blew off and caused this thing to overpressurize.

099 31 39 Young (LM comm): Probably right, Charlie.

099 31 43 Duke (LM comm): But the temps are good.

Public Affairs Officer: This is Apollo Control, 99 hours, 31 minutes Ground Elapsed Time into the mission of Apollo 16. To recap the current situation here in Mission Control Center, various considerations are underway on whether or not to continue the mission with a later landing or to have the two spacecraft, Orion and Casper, rendezvous, dock and do a Trans-Earth Injection burn using the Lunar Module's Descent Propulsion System. This would assume of course that the Service Propulsion System on the Command Module is inoperative, because of the apparent problem in the SCS or Stabilization Control System, which in turn drives and controls the SPS system, aboard the Command Service Module. We have something in the neighborhood of five revolutions or about 10 hours in which to reach the decision on the outcome of the lunar landing. As Orion came around the East limb of the Moon this last revolution in preparation for Power Descent Initiation, they were prepared for the landing. However Casper, piloted by Ken Mattingly, reported that he had not made the Circularization Burn. Since that time there have been many huddles here in the Control Room; engineers are going over drawings in the back rooms, simulations are underway here at the Manned Spacecraft Center to determine the nature of the Service Propulsion System control problem and hopefully by the time the crew comes around the corner again some 31 minutes from now at least some clarity will come out of the situation. But as mentioned earlier it may take the entire five revolutions. The limit of five revolutions has to do with the orbital geometry because after that time the orbital plain of the Lunar Module would be - would have drifted so far away from the landing site that the - there's not ample propellant to steer into the Descartes landing area from the present orbit without a [orbital] plane change. At 99:34, and 30 minutes and 30 seconds from acquisition of signal [from] both spacecraft, this is Apollo Control.

099 33 21 Duke (LM comm): Is that sunrise?

099 33 27 Young (LM comm): Yep.

099 33 30 Mattingly (CM comm): Did you say you had sunrise, Charlie?

099 33 32 Duke (LM comm): It's coming up. We can see it glowing beyond the horizon.

099 33 36 Young (LM comm): It's gonna be instant sunrise.

099 33 39 Mattingly (CM comm): [Garble] doing? Man, looks like [garble] dark as ever.

099 33 45 Duke (LM comm): It's behind you, Ken.

099 33 46 Young (LM comm): Yeah, it's behind you, boy. When it comes up, we won't be able to see you anymore.

099 33 52 Mattingly (CM comm): Okay; I've got you boresighted.

099 33 54 Young (LM comm): Okay.

099 34 15 Young (LM comm): Be kind of hard to get a radar lock. Oh, no.

099 35 24 Duke (LM comm): Yeow!

099 35 25 Mattingly (CM comm): Boy! Did you ever brighten up in a hurry!

099 35 34 Young (LM comm): It was long before we got there, though, that we saw it, right?

099 35 37 Duke (LM comm): Right. Yeah.

099 35 38 Young (LM comm): Do you reckon light bends?

099 35 40 Duke (LM comm): Huh?

099 35 44 Young (LM comm): Reckon the light bends?

099 35 44 Mattingly (CM comm): Man, are you ever bright!

099 35 48 Young (LM comm): Where'd my glove go?

099 37 40 Young (LM comm): We were Go for PDI there for a while.

099 37 43 Duke (LM comm): Yeah.

099 37 46 Young (LM comm): I can't - I can't believe it. I can't believe it (laughter). We'd had no trouble at all picking up the site either.

099 37 54 Duke (LM comm): I know; it's beautiful. I guess you can't win them all.

099 38 10 Young (LM comm): I'm not getting any cooling at all, Charlie. Are you?

099 38 13 Duke (LM comm): Cooling?

099 38 14 Young (LM comm): Yeah.

099 38 15 Duke (LM comm): A little bit out of the suit. Not much.

099 38 22 Young (LM comm): Why don't you go to LGC on a - for a second or two?

099 38 42 Young (LM comm): Okay.

099 39 13 Young (LM comm): Charlie, we ought to have an eat period is what we ought to do. You ain't hungry?

099 39 20 Duke (LM comm): No.

099 39 22 Young (LM comm): How about something to drink, or something like that?

099 39 24 Duke (LM comm): Back there in the food locker.

099 39 36 Duke (LM comm): I don't want anything, really.

099 39 38 Young (LM comm): You don't? Okay.

099 39 42 Duke (LM comm): Unless they got a sandwich or something back there. I'll eat that.

099 39 49 Young (LM comm): All they got is those drinks, Charlie. Those orange drinks.

099 39 57 Duke (LM comm): Wait a minute. Open the top, John.

099 40 01 Young (LM comm): I don't want to get too close to the hatch.

099 40 04 Duke (LM comm): Ain't nothing wrong with the hatch. It's okay.

099 40 15 Duke (LM comm): Those two on the left come open.

099 40 18 Young (LM comm): Yeah, I know it, if I can get to them.

099 40 38 Young (LM comm): See. Those orange drinks.

099 40 50 Duke (LM comm): What's all that's in there, is orange drinks?

099 40 52 Young (LM comm): Well, there's some stuff behind it, but I can't get at it. I'm not - I just can't. I - I could reach it with the moving the orange drinks, but if I do, I don't know what I'm gonna do with them.

099 41 06 Duke (LM comm): Put them in the Flight Data File up here. There's plenty of room up here.

099 41 47 Duke (LM comm): Oh, oh. Excuse me.

099 41 48 Young (LM comm): Son of a gun, I keep - I keep getting them things.

099 41 58 Young (LM comm): In this one?

099 41 59 Duke (LM comm): Yeah. Either one.

099 42 03 Young (LM comm): Don't think there is plenty of room in there. No, there ain't.

099 42 19 Young (LM comm): Man, there is more pieces of metal around this spacecraft! You want a food stick?

099 42 28 Duke (LM comm): It won't go in there?

099 42 31 Young (LM comm): Might if I fold them in half.

099 42 32 Duke (LM comm): Stick them into the ISA then.

099 42 41 Young (LM comm): There we go.

099 42 51 Young (LM comm): I'd hate for any of that stuff to get loose in zero gravity. It would be a mess.

099 43 07 Young (LM comm): Charlie, you got me almost to PDI there.

099 43 11 Duke (LM comm): Well, I tried hard.

099 43 12 Young (LM comm): You did good.

099 43 18 Duke (LM comm): But if the gear don't work. Well, maybe they'll come up with something.

099 43 27 Young (LM comm): How about a food stick? Can I have a food stick, Charlie?

099 43 30 Duke (LM comm): Sure.

099 43 59 Young (LM comm): Don't know where he is now.

099 44 01 Duke (LM comm): Probably down below him. Below us, rather. Hey, Ken, they want you to rendezvous at 100 hours, wherever that is.

099 44 10 Mattingly (CM comm): Yeah, I thought they said that was our closest point of approach, and it sure doesn't look to me like it's gonna be. Looks like we passed it back there about 20 minutes ago.

099 44 19 Duke (LM comm): Yeah, I - I agree with you. They want you to be active.

099 44 24 Young (LM comm): There is no way they can tell what it is or, these short things; they don't have any idea where we are, Charlie - Ken.

099 44 38 Mattingly (CM comm): Charlie, I'm going to try reacquire range and make sure I don't have a bad rate.

099 44 43 Duke (LM comm): Okay, I got 0.68 on the...

099 44 45 Mattingly (CM comm): I got 0.52. Let me reacquire and we'll try it again.

099 44 52 Young (LM comm): That - What is that? That's not 1678.

099 44 55 Duke (LM comm): No, that's...

099 44 56 Mattingly (CM comm): Say, could you could stay off the mike while I get it working?

099 45 16 Mattingly (CM comm): Okay, I have reacquired the LM. 0.55.

099 45 20 Duke (LM comm): Okay; you can start closing if you want, I guess.

099 45 25 Mattingly (CM comm): Yeah, I guess I will. I was gonna watch - watch the Sun here. It should scoot back around any minute.

099 45 31 Young (LM comm): Yeah, just be - Hey, if you want us to give you range and range rate, we'll lock on you. How about that?

099 45 37 Mattingly (CM comm): I'm sorry. I didn't understand what you said, John.

099 45 39 Young (LM comm): We should lock on you and give you range and range rate.

099 45 43 Mattingly (CM comm): Well, I thought you were saying you didn't have your radar, and I thought that made good sense.

099 45 47 Duke (LM comm): No. We got plenty.

099 45 49 Young (LM comm): We've got plenty of radar. We're going to do it.

099 45 51 Mattingly (CM comm): I thought you were trying to save on your amps.

099 45 54 Young (LM comm): No. No, we got plenty of amps.

099 45 57 Mattingly (CM comm): Okay. Well, that would help. That's better than this thing.

099 45 59 Young (LM comm): Dang right. Where are - Which way should we pitch to get to you?

099 46 05 Mattingly (CM comm): Beg your pardon?

099 46 06 Young (LM comm): Which way should we pitch to get to you?

099 46 09 Mattingly (CM comm): Oh. Well, let me see here. All - Oh, boy. It's hard to tell what figures I'm looking at, it's so bright. I think I'm looking at the top of you, though.

099 46 26 Young (LM comm): Okay.

099 46 28 Duke (LM comm): That's what it says, pitch up.

099 46 32 Young (LM comm): [Garble], Well, you can't believe that, Charlie. We ain't updated it.

099 46 35 Duke (LM comm): Huh?

099 46 36 Young (LM comm): We ain't updated it or nothing.

099 46 38 Duke (LM comm): I said - Oh, you mean the radar?

099 47 35 Young (LM comm): I don't see him anywhere.

099 47 42 Mattingly (CM comm): That's superbright. That must be - maybe I'm looking at the heat shield around your engine. That's probably it, because I can see the four gear. You - you must be pitched 180 to me.

099 47 57 Duke (LM comm): That's what I thought. He's been going in under us.

099 48 03 Young (LM comm): Well, why did you say pitch up?

099 48 05 Duke (LM comm): I didn't say that, Ken did.

099 48 09 Young (LM comm): (Laughter) You ain't gonna take credit for it, huh? [Garble] I'd have swore I heard you say pitch up.

099 48 16 Duke (LM comm): Well, that's what the AGS says, but that ain't right.

099 48 20 Young (LM comm): Well, it must have been - You know...

099 48 21 Duke (LM onboard): Yeah, yeah.

099 48 22 Young (LM comm): ...you can't - Anything less than a mile, these things ain't no good. Because - Well, AGS is okay. But this thing here measures from the center of the Moon. I don't have the foggiest notion where our boy is.

099 49 32 Young (LM comm): Hear that noise?

099 49 35 Duke (LM comm): It's in the comm. Oh, that whooooo? Oh, yeah.

099 49 42 Young (LM comm): That's what I mean.

099 49 43 Duke (LM comm): Yeah.

099 49 44 Young (LM comm): We were back here - It's got something to do with the VHF ranging.

099 51 02 Young (LM comm): Boy, I don't see him anywheres.

099 51 06 Duke (LM comm): Think we got quite a ways to pitch yet.

099 51 08 Young (LM comm): Oh, shoot. Do it.

099 51 16 Young (LM comm): There he is. Yeah, he's way far away from us. I think what the problem is, Ken...

099 51 21 Duke (LM comm): There he is, dead ahead.

099 51 22 Young (LM comm): ...is you're opening up.

099 51 24 Duke (LM comm): Dead ahead.

099 51 25 Young (LM comm): Yeah, I got it.

099 51 26 Duke (LM comm): Push the Rendezvous Breakers breakers in.

099 51 27 Young (LM comm): Yeah, that's a good idea.

099 51 32 Mattingly (CM comm): I agree with you.

099 51 33 Young (LM comm): You want to be careful how much velocity you add, because you're too low to add a lot. Or...

099 51 39 Mattingly (CM comm): So far I've just put in two foot per second, but that's - that's even closing [garble]

099 51 45 Young (LM comm): Okay.

099 51 47 Mattingly (CM onboard): It looks like you're looking at me now.

099 51 49 Young (LM comm): Well, two foot per second, you should of took out two foot a second on account of you're ahead of us.

099 51 56 Mattingly (CM comm): Say again?

099 51 59 Young (LM comm): Remember Mr. Kepler?

099 52 10 Mattingly (CM comm): Say again, John.

099 52 11 Young (LM comm): Either way, two foot in or out will do it. That'll make him slow down when he goes up over the top of us.

099 52 23 Duke (LM comm): Yeah.

099 52 28 Young (LM comm): I'd rather have - There we go.

099 52 58 Duke (LM comm): Hey, we got him. Okay. He's still opening.

099 53 03 Mattingly (CM comm): Okay. What kind of a range do you read now?

099 53 05 Duke (LM comm): 0.66 miles and open, and it's 0.6 foot a second.

099 53 09 Mattingly (CM comm): Okay.

099 53 24 Mattingly (CM comm): Well, I guess I better put in another couple of foot per second then. Hate using all that gas on it, but I guess that's the only way.

099 53 50 Young (LM comm): Let me get him boresighted and locked up.

099 54 08 Young (LM comm): Well, let me get it like this.

099 54 10 Duke (LM comm): Okay. Thought we might have had a side lobe.

099 54 16 Young (LM comm): Yeah.

099 54 19 Duke (LM comm): There you go. Go to LGC.

099 54 34 Duke (LM comm): Got a side lobe.

099 54 35 Mattingly (CM onboard): Okay, what do you show now? ["Tell me when you [garble]" in LM comm]

099 54 41 Duke (LM comm): Stand by, Ken. We had a side-lobe block. We're getting the main lobe.

099 54 44 Mattingly (CM onboard): Okay.

099 54 48 Duke (LM comm): That looks like it, John. Oh, you want to go to -

099 55 01 Young (LM onboard): There we go.

099 55 04 Duke (LM comm): Okay; we close. Show 0.68 miles [1.26 kilometres], 0 feet a second,

099 55 12 Young (LM comm): Yeah, you're 4200 [feet, 1,280 metres] out. It says here it -

099 55 20 Duke (LM comm): Okay; we show you -

099 55 35 Duke (LM comm): Better not add too much.

099 55 36 Young (LM comm): No. I'd just hold what you got, Ken.

099 55 39 Mattingly (CM onboard): Okay.

099 55 41 Duke (LM comm): He'll drop way down. You know, if he - if he fires this way, it's retrograde; it's gonna drop him low - lower his orbit.

099 55 55 Young (LM comm): Yeah, how much did you put in?

099 55 57 Mattingly (CM comm): I put in a total of 3.5 [feet per second or 1.0 metres per second].

099 56 01 Young (LM comm): Okay. Well, that's gonna get you right close to the ground.

099 56 05 Mattingly (CM comm): Not from over here.

099 56 10 Mattingly (CM comm): Well, I ain't gonna get very far from you.

Public Affairs Officer: This is Apollo control 99 hours, 56 minutes Ground Elapsed Time into the mission of Apollo 16. Some seven minutes, 40 seconds away from acquisition on the 14th lunar revolution. To recap again the current situation in the mission, the circularization burn for command module Casper was aborted when Ken Mattingly discovered some discrepancies in the backup system which control the Service Propulsion Engine. We still have a good prime system, that is a Guidance and Navigation system aboard the Command Module, however, we would be one failure away for the very critical Trans-Earth Injection maneuver which requires a fairly lengthy burn and a stable engine bell from the Service Propulsion System; therefore, quite a few people here in Houston and at the spacecraft manufacturer in Downey, California are looking into the ramifications of the backup system having apparently failed would this present any structural strain on the spacecraft if the engine bell went to full yaw, and would we be able to do a successful Trans Earth Injection with this engine. As all of these questions are answered the decision will be made whether or not to continue with the landing phase or to rendezvous and do a Trans Earth Injection burn using the Descent Engine on the Lunar Module, Orion. We have about five revolutions or some 10 hours in total time in which to make this decision. This, again, is dictated by the orbital mechanics. The fact that the Lunar Module would drift away from the desired ground track for the landing site at Descartes during any time past these five revolutions. The Gold Team of flight controllers will stay on duty in the Control Center for the landing if a decision is made to land. If the decision is made to rendezvous and do a docked descent propulsion burn to bring the spacecraft home, Pete Frank's Orange Team will take over. Some 4 minutes, 37 seconds now away from acquisition and at 100 hours, even, this is Apollo control.

099 56 28 Mattingly (CM comm): Am I closing any yet?

099 56 32 Young (LM comm): No. It - it'll take half a rev.

099 56 34 Mattingly (CM comm): Okay, I'm not sure - it seemed to me like they gave us bum dope on this 100 hours.

099 56 44 Young (LM comm): Yeah, you know they have no idea where we are.

099 56 47 Mattingly (CM comm): Yeah, but they know where we undocked and we haven't done anything. Think they ought to...

099 56 51 Young (LM comm): No, no. There's no way. Not for short ranges like this.

099 57 24 Mattingly (CM comm): I really wanted to get within half a rev. I guess that ought to be a radial burn, shouldn't it?

099 57 30 Duke (LM comm): Okay. We show you closing slightly now, about a half a foot a second.

099 57 35 Mattingly (CM comm): Okay.

099 57 54 Mattingly (CM comm): Yeah, it shows it took me down to 8.6. But as long as I stick with you, I can't get too far away.

099 58 03 Young (LM comm): Okay. Our Range Rate meter says you're 4,100 foot [1,250 metres] out.

099 58 07 Mattingly (CM comm): Okay.

099 58 19 Mattingly (CM comm): What do you show for your - perilune?

099 58 23 Duke (LM comm): The what?

099 58 25 Mattingly (CM comm): What's your perilune?

099 58 35 Duke (LM comm): Ours says 11.0 [miles, 20.4 kilometres], Ken.

099 58 41 Mattingly (CM comm): Okay, I'm reading 8.6 [15.9 kilometres].

099 59 02 Duke (CM comm): I guess the five revs might have been, John, the - the high gain coverage they got, since our steerable doesn't work. We can go as long as we got the 210.

099 59 15 Young (LM comm): Yeah.

099 59 22 Duke (LM comm): It's going to be hard to run - He's going to take a lot of gas to get over here.

099 59 27 Young (LM comm): Should have took it out.

099 59 31 Duke (LM comm): Huh?

099 59 43 Young (LM comm): You thrusted toward us 3.5 feet a second. Is that true?

099 59 47 Mattingly (CM comm): I thrusted toward you 3.5. Yeah that was - looks like mostly retrograde.

099 59 55 Duke (LM comm): Yeah. Looks like to me you're gonna have to go up a little bit now, a couple of feet a second.

100 00 04 Mattingly (CM comm): Have you got some kind of a chart there I could navigate with?

100 00 07 Young (LM comm): No, we sure don't.

100 00 08 Duke (LM comm): No. But, see, that retrograde burn is going to take you down, below us.

100 00 15 Mattingly (CM comm): Roger. I understand that. It really looks like what I want to do is make a radial burn, you behind me. I really ought to make a radial burn now, shouldn't I?

100 00 33 Duke (LM comm): Yeah. Shouldn't he?

100 00 35 Mattingly (CM comm): How about let's do that?

100 00 41 Duke (LM comm): Okay.

100 00 44 Mattingly (CM onboard): What's my range and range rate now?

100 00 47 Duke (LM comm): 0.680 feet a second [0.21 metres per second].

100 01 28 Mattingly (CM comm): Okay. There's 0.5 foot per second 0.15 metres per second] radial out. ["0.4 foot per sec" in LM tape]

100 01 33 Duke (LM comm): Okay.

100 02 09 Duke (LM comm): Man, it's really white into zero phase, isn't it?

100 02 25 Mattingly (CM comm): Sure looks to me like I'm opening again.

100 02 29 Duke (LM comm): Well, we got you about zero, Ken, maybe closing slightly. I think it's gonna take a couple of feet per second radial.

100 02 49 Young (LM comm): He's got to go up like that. But with our mechanics, it may not do anything.

100 03 04 Mattingly (CM comm): I guess I'm getting a little concerned about that minus-X I put in there.

100 03 18 Young (LM comm): Guess I don't blame you. I'd have thought you'd have put in plus-X and rose over the top of us.

100 03 25 Mattingly (CM comm): Yeah, I think I'm gonna take it back out and go the other way. That sound reasonable?

100 03 36 Duke (LM comm): Sure does to me, Ken.

100 03 55 Mattingly (CM onboard): Okay; here we go.

100 04 27 Mattingly (CM comm): Okay, there's two - two power.

100 04 30 Young (LM comm): Okay, now that shows you're opening at 3 and a - that shows you're opening at 3 [feet per second - 0.9 metres per second].

100 04 44 Duke (LM comm): Here comes Earthrise. See it?

100 04 52 Young (LM comm): Yeah.

100 04 53 Duke (LM comm): That's spectacular.

100 04 58 Young (LM comm): Yeah. Now according to our mechanics, you're bound to end up behind us, and close to us.

100 05 07 Mattingly (CM comm): Okay. That shows I got a 59 by 9 [nautical mile, 109 by 17 kilometres orbit].

Public Affairs Officer: This is Apollo Control [at] 100 hours, 3 minutes Ground Elapsed Time. Less than a minute away from acquisition of Orion and Casper coming around the east limb of the Moon on the 14th lunar revolution. Standing by for acquisition here half a minute away. The atmosphere here in the control room is reminiscent of the period just after the cryogenic oxygen tank incident on Apollo 13. Ten seconds. We' re waiting confirmation from the network controller that we've had acquisition. We have AOS, Lunar Module. Lets stand by now for resumption of communications between the control center, Jim Irwin CapCom, and the crew of Casper and Orion.

[LM tech transcript restarts ]

100 05 19 Duke (CM): Houston, Orion. How do you read?

100 05 24 Irwin: Orion, this is Houston. Read you loud and clear.

100 05 26 Duke (CM): Roger; same-o, Jim. We're about 0.7 of a mile 1.3 kilometres] out from Casper now.

100 05 42 Irwin: Say again, Charlie. We still have excessive noise down here.

100 05 46 Duke (CM): I say our range to Casper is about 0.7 of a mile.

100 05 51 Young (CM): And he's opening at 2 [feet per second, 0.8 metres per second]. He put in some posigrade velocity to go up and above and come down and get with us.

100 06 08 Mattingly: John, I think that total is still slightly retrograde.

100 06 12 Young (CM onboard): The total is slightly retrograde?

100 06 18 Mattingly: Yeah, you - I - I'm thinking maybe I ought to go put some more in there. What do you think?

100 06 31 Mattingly: Okay.

100 06 50 Irwin: Okay, 16. This is Houston. We still don't have an answer, but people are working very feverishly.

100 07 03 Duke (LM onboard): Orion. Roger.

100 07 05 Young (LM onboard): Okay; thank you. It'll probably be awhile before we get to station-keeping anyway. Like about a week.

100 07 18 Irwin: Roger.

100 07 25 Mattingly: That only shows 9.2 [2.8 metres per second]. Why don't we get them to get an arc on this? I guess I'd like to know how good my vector was to start with.

100 07 33 Young (LM onboard): It's no good this close in, Ken.

100 07 36 Mattingly (CM comm): How's that?

100 07 38 Mattingly: Say again? I'm sorry; I can't hear you.

100 07 37 Young (LM onboard): It's not any good this close in.

100 07 40 Mattingly (CM comm): Okay. I can't hear you.

100 07 43 Duke (LM comm): He said it's not any good this close in.

100 07 49 Mattingly: I know, but my state vector is good. How good is it?

100 07 52 Young (LM comm): Oh, okay.

100 07 53 Mattingly (CM comm): That's what I'd like to know from Houston.

100 07 54 Young (LM onboard): You're not locked on them?

100 07 55 Irwin: Stand by, Ken.

100 07 57 Duke (LM onboard): Ken - Ken, you should be able to get a lock on with them.

100 08 01 Mattingly (CM comm): No, I've been trying that.

100 08 04 Mattingly: Roger. I'm trying now.

100 08 22 Duke (LM comm): Houston, Orion.

100 08 25 Irwin: Go ahead, Orion.

100 08 28 Duke (LM onboard): Okay; we got an RCS System A Reg light. Pressures: Helium is looking like 2300...

100 08 36 Young (LM onboard): Get the B?

100 08 37 Duke (LM onboard): The Propellant is at 210; the Fuel Manifold at - and Ox Manifold is - correction, make it 215 - or 220. And everything else looks pretty good. Pressures are holding up - You think the burst disk is gone?

100 08 56 Mattingly: Houston, do you read Casper?

100 09 00 Irwin: Roger. That looks that way to us, Charlie.

100 09 02 Mattingly: Houston, do you read Casper?

100 09 06 Duke (LM onboard): Okay.

100 09 07 Irwin: Yes, Casper. This is Houston. Read you loud and clear.

100 09 08 Mattingly: Okay. Look like we got a - that 100 hours was a bad time, and I tried to close at him before he realized that it was all minus X. I put in about 3 foot per second and got to checking. That didn't look like the right thing to do. So I took about 3 of that out, and...

100 09 25 Young (LM onboard): Hey, Ken, why don't you summarize what you did in the way of thrusters to tell them what to expect. Okay ?

100 09 31 Mattingly (CM): I'm doing that, John.

100 09 31 Mattingly (CM): ...and so I took about three of that out, and I put in a half foot per second radial at about 100 hours and 5 minutes. And I put in the rest, took two foot per second posigrade at about 100 hours and 6 minutes. And at about 100 hours, then I put in three - it was about - roughly retrograde. And my computer now shows 16.5 by 9.2. And I had a good state vector when I started, and that's probably a good value - whenever you get a short arc or something on me.

100 10 11 Irwin: Roger. We copy, Ken.

100 11 00 Duke (LM onboard): That [garble] sound - sounds like all the gears are broken in it.

100 11 07 Irwin: Orion, this is Houston. We're wondering where you got the estimate of 0.7 nautical-mile range [1.3 kilometres].

100 11 18 Duke (LM onboard): We got the rendezvous radar locked on, if you want us to. Or do you want us to turn it off?

100 11 24 Irwin: No, that's fine.

100 11 30 Mattingly: Yeah, I show us now at about 0.9 mile [1.7 kilometres]. Is that correct?

100 11 33 Duke (LM comm): That's right, Ken.

100 11 35 Young (LM com): 5500 feet, Ken [1.7 kilometres].

100 11 38 Mattingly: Okay. And still opening?

100 11 38 Young (LM comm): Yeah.

100 12 00 Duke (LM comm): Houston, Orion. John and I been talking about - If we get to land this thing, we'd like to - probably ought to think about going to sleep first, and we'd get up and do a full EVA tomorrow.

100 12 14 Irwin: Roger. We - we concur down here.

100 12 34 Mattingly (CM comm): Could you tell me if my range...

100 12 33 Irwin: Okay, Casper; this is Houston. We're recommending that you null the line-of-sight range...

100 12 38 Mattingly: ...[garble] Go ahead.

100 12 39 Irwin: ...and fire five feet per second toward the LM.

100 12 46 Mattingly: Okay. That's still going to be mostly retrograde, it looks like. That's how I got in this place to start with.

100 13 02 Irwin: We copy you, Ken.

100 13 06 Mattingly: Okay, I'm going to hold. Can you guys get a short arc going on my trajectory?

100 13 35 Irwin: Okay, Ken. We show you coming up on perilune now, so you'll be affecting your apolune.

100 13 47 Mattingly: You show me coming up on perilune?

100 13 49 Irwin: That's affirmative.

100 13 50 Mattingly: Roger. My state vector shows 19 miles up [35 kilometres], and we're not - I'm just passing Smythii. is that - Does that sound reasonable, that we shifted that much in orbital track?

100 14 13 Irwin: Okay. That sounds good, Ken.

100 14 27 Mattingly: Okay, I guess I'd like for you to - to summarize again where I stand. I'm a little bit confused now, Jim.

100 14 35 Irwin: Roger. We were hoping that...

100 14 40 Mattingly: [Garble] I'm just passing Smythii, and my altitude according to my computer - Was my state vector a little bit off to start with?

100 14 52 Irwin: We think your state vector was fairly accurate, Ken.

100 14 59 Mattingly (CM comm): Okay. Then there's still a discrepancy in - -

100 15 00 Irwin: And you'll be at perilune in 15 minutes...

100 15 02 Mattingly: Okay, that makes more sense. All right. Because I'm presently at 19 miles, and I think that's probably a good estimate. All right. If I do - Do you want me to thrust towards the LM now, because I'm approaching perilune. Is that affirmative?

100 15 21 Irwin: That's affirmative.

100 15 26 Mattingly: Okay. Now I'm - This is using up a great deal of RCS which is going to violate the next line. Is this preferable to trying to do a regular rendezvous now?

100 15 38 Young (LM onboard): Regular what?

100 15 46 Mattingly (CM): Because if we still have a chance at landing, then I need to [garble] to you...

100 15 46 Irwin: Ken, could you give us your position, relative to the LM?

100 15 56 Mattingly: Yes, sir. I'm ahead of him and slightly below, and I show a - a mile [1.8 kilometres] on the EMS, and I don't know what John has on the radar.

100 16 04 Young (LM onboard): Yeah, he's - he's ahead of us, and I show him about - level and 6,500 feet [2.0 kilometres] out and opening at 3 feet a second [0.9 metres per second].

100 16 23 CC-CM: Okay. We copy your position as ahead, below, and about one nautical mile.

100 16 31 Mattingly: That's affirmative.

100 16 32 Young (LM onboard): And he's opening at 2-1/2 on 1678. And 3 feet a second on the tapemeter.

100 16 37 Irwin: Roger.

100 16 44 Irwin: Okay. Stand by.

100 16 XX Young (LM onboard): Give me a Verb 83.

100 16 50 Duke (LM onboard): Can't unless we terminate this.

100 16 52 Young (LM onboard): Well, let's terminate it.

100 17 03 Young (LM onboard): Can't terminate it, huh? Go to Auto in Track.

100 17 08 Mattingly: Okay, Jim. To make sure there's no confusion, I haven't done anything yet.

100 17 10 Duke (LM onboard): No, you got to -

100 17 17 Irwin: Okay. Stand by.

100 17 22 Mattingly: Thank you, sir.

100 17 32 Young (LM onboard): Okay. On the - on the COAS, I've got him boresighted there, and he's 35559 from local vertical.

100 17 44 Irwin: Okay, Casper. This is Houston. We're convinced that we want you to fire directly at the LM about 5 feet per second. We want to get a positive closing rate.

100 17 58 Mattingly: Okay. That's in work.

100 19 38 Mattingly: Okay. It looks like the DAP isn't stable now. How about if I give it a Verb 46?

100 19 45 Irwin: Roger. We copy.

100 19 53 Mattingly: Is that a good idea?

100 20 02 Irwin: Ken, we show you in Free.

100 20 06 Mattingly: I am now: but I wasn't.

100 20 08 Young (LM onboard): The DAP is unstable!

100 20 09 Irwin: Okay.

100 20 11 Mattingly: Does that mean I'm clear to do a Verb 46?

100 20 09 Duke (LM onboard): Yeah, they said okay.

100 20 13 Young (LM comm): They say okay, Ken.

100 20 14 Mattingly (CM): Okay. Oh, it still didn't work. I think maybe I've had one of those transients.

100 20 36 Mattingly (CM): For some reason, every time I pick up CMC Auto, this thing - starts doing maneuvers.

100 20 58 Irwin: Orion, let's go Lo Bit Rate.

100 20 59 Duke (LM onboard): Can't believe it.

100 21 03 Young (LM onboard): Turn on some water, Charlie.

100 21 11 Irwin: Orion, let's go Lo Bit Rate.

100 21 12 Mattingly: Okay. I've got it under control, Jim. I had a bad DAP.

100 21 18 Duke (LM): You have it.

100 21 25 Young (LM onboard): Okay.

100 22 00 Mattingly: Okay; we'll [garble] 5 feet per second directly at the LM.

100 22 11 Irwin: Go.

100 22 10 Young (LM onboard): Didn't mean to do that.

100 22 12 Duke (LM onboard): What?

100 22 14 Young (LM onboard): What he just did.

100 22 15 Duke (LM onboard): Huh?

100 22 16 Young (LM onboard): He didn't mean to do it.

100 22 17 Duke (LM onboard): He didn't?

100 22 18 Young (LM onboard): No. It's going up and over us right now.

100 22 28 Young (LM onboard): See? The line-of-sight rate...

100 22 34 Irwin: Casper, this is Houston. Hold up on that RCS maneuver.

100 22 37 Mattingly: Okay. I've put in 3 feet per second.

100 22 38 Irwin: Hold up, Ken.

100 22 45 Mattingly (CM comm): Say again, please?

100 22 47 Irwin: Okay. Hold it there.

100 22 48 Mattingly: [Garble] Okay. Holding at three.

100 23 08 Duke (LM onboard): You keeping him boresighted?

100 23 10 Young (LM onboard): Yeah.

100 23 24 Duke (LM onboard): Roll's going off a little bit, John. Not that that's going to hurt you any.

100 23 50 Duke (LM onboard): Say he's drifting down - that says he's drifting down.

100 23 54 Young (LM onboard): He's drifting up.

100 23 55 Duke (LM onboard): Well, look at the needle.

100 23 58 Young (LM comm): Okay, Ken, to - to get us, you're going to have to thrust down to null the needles.

100 24 10 Mattingly: Thrust down means towards the Moon or down as you see it?

100 24 13 Duke (LM onboard): Towards the Moon.

100 24 14 Young (LM onboard): Towards the Moon.

100 24 18 Mattingly (CM comm): Okay. I guess I am. Houston, do you want me to go null line of sight all the way in?

100 24 25 Irwin: We need a range and range rate reading now.

Public Affairs Officer: A maneuver Mattingly was attempting was a 5 foot per second line of sight RCS maneuver toward the Lunar Module. Right now he's ahead and below the Lunar Module by about one nautical mile straight line distance. We would like to reemphasize that this will be strictly for a station-keeping. Lunar landing is still not positively ruled out at this time depending on what decision is made on the - with reliability of the Stabilization and Control System to control the SPS engine on the Service Module. Continuing to monitor air [to] ground from both spacecraft. This is Apollo Control [at] 100 hours, 24 minutes.

100 24 28 Mattingly: [Garble]

100 24 30 Young (LM comm): 7000 feet [2100 metres], closing at 3 feet [0.9 metres] a second, and we have a line-of-site rate.

100 24 44 Irwin: Roger. We copy.

100 24 44 Duke (LM comm): Okay, Ken. If you can kill that line of sight, you're closing.

100 24 48 Irwin: Roger; we copy.

100 24 49 Mattingly: Roger, Charlie. I'm standing by for instructions for best [garble]

100 25 05 Irwin: Yes, Casper; this is Houston. You should null the line-of-sight rates.

100 25 11 Young (LM onboard): He'll take...

100 25 13 Mattingly: Okay, do you want me to keep them nulled and go all the way in? Is that the idea?

100 25 17 Irwin: Roger. Keep a positive closing rate.

100 25 24 Mattingly: Okay. It's likely to be expensive, but we'll do that.

100 25 30 Mattingly: Okay, you're going to have to - Your needles are better than mine, why don't you tell me what to do there, John.

100 25 38 Young (LM): Okay. Thrust down, and I'll tell you which way the needle moves. [Garble].

100 25 41 Duke (LM onboard): Towards the Moon, Ken.

100 25 42 Young (LM onboard): Towards the Moon.

100 25 44 Mattingly: Wilco.

100 25 49 Young (LM): That's the wrong way, Ken.

100 25 50 Mattingly (CM comm): That's sure towards the Moon.

100 25 53 Young (LM): Were you thrusting?

100 25 54 Mattingly (CM comm): That's affirmative.

100 25 55 Young (LM): Okay, thrust away from the Moon. That's doing it. Little more.

100 26 13 Young (LM): You didn't get it corrected, Ken.

100 26 19 Mattingly (CM comm): How's that now?

100 26 21 Young (LM): Oh, it's just not moving very much at all.

100 26 24 Mattingly (CM comm): You think this is a good place to stop.

100 26 26 Young (LM): No, you - It's gonna be expensive, Ken, to do this, but you - you're gonna have to thrust up.

100 26 32 Mattingly: Okay, I just need some gauges to when I got it nulled.

100 26 37 Young (LM onboard): Okay. You don't have it nulled.

100 26 43 Mattingly (CM comm): How's that?

100 26 45 Young (LM onboard): That's - you've got 4 milliradians down.

100 26 55 Mattingly (CM): Okay. What's my range rate?

100 26 57 Young (LM): Three - 3 feet a second, closing.

100 27 00 Mattingly (CM): Okay.

100 27 01 Young (LM): You're at 6600 feet [2,000 metres].

100 27 03 Mattingly (CM): Still going down.?

100 27 05 Young (LM onboard): That's affirmative.

100 27 13 Young (LM onboard): You got it to 3 milliradians.

100 27 17 Young (LM onboard): You got it to 2 milliradians.

100 27 28 Young (LM): You've got it to 2 milliradians. Now you've got it, Ken. You killed it.

100 27 32 Mattingly (CM comm): Okay.

100 27 55 Mattingly: Looks to me now like I'm drifting the other way.

100 27 59 Young (LM onboard): Not according to my needles.

100 28 01 Mattingly (CM): Okay; I'll believe your needles.

100 28 07 Young (LM onboard): Better be something right around here.

100 28 16 Duke (LM onboard): Well, I really don't know.

100 28 18 Young (LM onboard): Don't know what, Charlie?

100 28 25 Mattingly: Range rate?

100 28 31 Young (LM): Three and a half feet [1.1 metres] a second, and you're at 6300 feet [1900 metres].

100 28 35 Mattingly: Okay.

100 29 01 Mattingly: Is the rate starting to build now? I'm trying to calibrate the dead band activity here so I can tell what the rate - when it's really a rate and when it's just dead banding.

100 29 14 Young (LM): Okay. Your rates are nulled, essentially.

100 29 20 Mattingly: Okay, thank you.

100 29 21 Young (LM onboard): Turn on some more water, Charlie. I don't know if I can stand this or not.

100 29 27 Duke (LM onboard): I think I might throw up.

100 29 47 Duke (LM onboard): Houston, Orion...

100 29 47 Irwin: Orion, request you select the Secondary Transmitter and Receiver.

100 30 07 Duke (LM onboard): Ken - Ken, tell them I selected that Secondary. It'll be awhile.

100 30 12 Mattingly: Okay, Houston. Orion says that they have already selected the Secondary.

100 30 24 Duke (LM): Okay, Houston. How do you read now?

100 30 29 Irwin: Read you loud and clear, Orion.

100 30 32 Duke (LM): Okay. You're five by. How's the problem looking?

100 30 54 Irwin: 16, no answers yet. We're still looking at it.

100 30 55 Duke (LM onboard): You - you maneuvering, aren't you, John?

100 31 11 Duke (LM onboard): You - are you - you're pitching up, aren't you?

100 31 13 Young (LM onboard): Yeah.

100 31 14 Duke (LM onboard): Huh?

100 31 15 Young (LM onboard): Yeah.

100 31 16 Duke (LM onboard): Okay. I just wondered. He looks like to me he's moving on out there some.

100 31 21 Young (LM onboard): He is moving out.

100 31 42 Young (LM): Okay, Ken. You're at 5600 feet [1700 metres], closing at 4 feet [1.2 metres] a second.

100 31 48 Mattingly: Okay.

100 32 10 Irwin: Okay, Orion. This is Houston. We'd like you to open the Primary Power Amp circuit breaker on [Panel] 16.

100 32 23 Duke (LM): It's open, Jim.

100 32 25 Irwin: Roger.

100 32 46 Irwin: Okay, Orion, let's go Hi Bit Rate.

100 32 52 Duke (LM): Roger. You have Hi Bit Rate.

100 32 54 Irwin: Roger.

100 33 02 Duke (LM onboard): Here comes the landing site.

100 33 07 Young (LM onboard): Yeah.

100 33 20 Young (LM): Okay, Ken. You're getting a line-of-sight rate. You're going to have to thrust a little toward the Moon.

100 33 29 Mattingly: Okay, let me try this.

100 33 32 Irwin: Okay, we can't hold Hi Bit Rate. Request you go back to Lo Bit Rate, Orion.

100 33 38 Mattingly: Is that the right direction?

100 33 41 Young (LM comm): Needles didn't move, Ken.

100 33 46 Duke (LM comm): That's the right direction.

100 33 51 Mattingly: Okay, that's up for me - it looks like it ought to be down for you.

100 34 02 Duke (LM): That sounds pretty good, Ken.

100 34 03 Mattingly: Okay.

100 34 23 Young (LM onboard): Okay, Ken. You've got it.

100 34 23 Irwin: Orion, this is Houston. Can you give us a range and range rate read-out?

100 34 30 Young (LM): Okay; 4900 feet [1500 metres], closing at 5 [feet 1.5 metres, per second].

100 34 34 Irwin: Roger. 4900 closing at 5.

100 34 53 Young (LM): You got the line-of-sight rates nulled now, Ken.

100 35 00 Mattingly: Okay. Man, this is expensive.

100 35 14 Young (LM onboard): They wouldn't want to do it the easy way. We're gonna arrive at the same time, in the dark. They've thrusted toward us at - at perigee at 100 hours. Man, that's really - I mean, he's thrusting at apogee so it'd take effect at perigee. And that's no good.

100 36 18 Mattingly: Rates hulled again, John?

100 36 19 Young (LM): Yes, they're nulled right now.

100 36 20 Mattingly: Okay - They are going to keep building this way, and do we have some - some fuel point at which to cut off and switch over to LM power.

100 36 36 Young (LM): How much are you using?

100 36 XX Mattingly: Well, it's really showing, and I don't know how much more we're going to see on the way in and I'm reading - of course, these gages don't tell you exactly what it is, but I have - That's 65 percent showing on B. And all this stuff is going to be in the - in the [garble]. Houston, you got any thoughts on a cut-off point on the RCS?

100 37 15 Irwin: Stand by, Ken.

100 37 17 Young (LM): Okay, well, you're at 4000 feet [1200 metres] now, at 5 feet [1.5 metres] a second, Ken.

100 37 20 Mattingly (CM comm): Okay...

100 37 21 Young (LM): And - and - and your line-of-sight rate is starting to build a little in the other direction. You've got it now.

100 37 22 Mattingly: Okay, hopefully, that's most of it.

100 37 54 Irwin: Orion, this is Houston. Is the CSM above you or below you? We hope he's directly ahead.

100 38 07 Young (LM): He's at 45 degrees above us.

100 38 11 Irwin:: Forty-five degrees above.

100 38 15 Young (LM): Above the local vertical.

100 38 18 Irwin: Roger.

100 38 29 Young (LM): And, he's got a - a 5-foot-a-second closing rate, and his line of sights are nulled on the radar.

100 38 34 Irwin: Roger.

100 38 43 Mattingly: And they look like they are killed completely on the optics too. Going to need your tracker light here in a minute. We're just getting a little glinted sunlight now.

100 38 55 Duke (LM comm): Okay. It's on now?

100 39 00 Mattingly: Okay. Thank you.

100 39 03 Young (LM onboard): Which way was he supposed to thrust to null them?

100 39 09 Duke (LM onboard): The one that was down - then it was up, he was thrusting -

100 39 14 Young (LM onboard): Toward the Moon...

100 39 15 Duke (LM onboard): Yeah.

100 39 16 Young (LM onboard): ...away from the Moon.

100 39 17 Duke (LM onboard): It was down for him.

100 39 18 Young (LM onboard): It was opposite.

100 39 19 Duke (LM onboard): Yeah. They're just opposite of what we're looking at.

100 39 20 Young (LM onboard): Yeah.

100 39 31 Mattingly: Boy, those rates look steady as they can be.

100 39 33 Young (LM): You've really got them killed.

100 39 51 Mattingly: Okay, and since we are going to get rendezvoused in the dark - I guess we'll just come up alongside and hold stations.

100 40 05 Young (LM): That seems like a fair thing.

100 40 09 Mattingly: All right, sir.

100 40 41 Young (LM onboard): Would - would it be easier to thrust down now?

100 40 46 Duke (LM onboard): Yeah.

100 40 50 Young (LM): Okay, Ken. You're going to have to thrust down a hair.

100 40 57 Mattingly: That's down to you, right?

100 40 56 Duke (LM onboard): It looks - it would be up to us, Ken. I think if we thrusted, we'd have to thrust up. I think you have to thrust down a skosh.

100 41 05 Mattingly: Yes [garble]. Yes, that's what I mean, you would thrust - you would thrust up.

100 41 07 Duke (LM onboard): Yeah.

100 41 08 Mattingly: Okay. I think I got it killed again.

100 41 11 Duke (LM onboard): It's looking good.

100 41 12 Young (LM onboard): Looks pretty good.

100 41 17 Mattingly (CM comm): What's that closing rate now?

100 41 19 Young (LM): Looks pretty good. Still five feet a second. Still off 3 feet [1.1 metres] a second now at 3000 [900 metres].

100 41 23 Mattingly: 3 feet per second.

100 41 25 Young (LM onboard): Roger.

100 41 26 Mattingly (CM): Okay, all I've got's the tracking light; I've lost the rest of your image.

100 41 32 Young (LM): Okay. You've - you're gonna have to thrust a little more to kill that rate the same way.

100 41 48 Young (LM): Okay. That got a lot of it, but not all of it. Okay. You got most of it.

100 41 58 CC-CM/LM: Okay, Casper. This is Houston. You might pick up a temperature caution light on your quads, but it's of no consequence.

100 42 09 Mattingly: Okay. Yes, I see B is up high. Is that due to the thruster activity?

100 42 14 Irwin: Affirmative, Ken.

100 42 15 Mattingly: Or is that due to heater fail-on?

100 42 19 Irwin: I think it's thruster activity.

100 42 21 Mattingly: Okay. Roger.

100 42 28 Irwin: Orion, this is Houston. Will you give us another range and range rate, John?

100 42 35 Young (LM): Yep. They're at 3100 feet [950 metres], at 3.

100 42 44 Young (LM): Roger. At an angle of 68 degrees to local vertical now.

100 42 50 Irwin: Understand; 68 degrees.

100 43 23 Young (LM onboard): I can't believe I'm doing this. I can't believe we're doing this. Turn on some more water.

100 43 33 Young (LM): Okay, Ken. You got a sight rate going to the south according to my needles.

100 43 49 Young (LM onboard): Whoa, Charlie.

100 43 50 Duke (LM onboard): Whoa.

100 43 51 Mattingly: Okay. Let's watch that for a minute before I start working on it, because we haven't had any plane component before.

100 43 58 Mattingly: How's the line-of-sight rate doing now? Holding?

100 44 01 Young (LM onboard): It's holding. It's holding - the vertical one is holding right on.

100 44 05 Mattingly: Okay. And range rate?

100 44 02 Young (LM): Holding - holding the vertical, and it's holding right on. You're at 3000 feet [900 metres], at 3 feet [0.9 metres] a second.

100 44 17 Mattingly (CM): Okay.

100 44 18 Young (LM comm): 2800 feet [850 metres].

100 44 21 Mattingly: Now we must be going in the right direction then. Yeah.

100 44 25 Young (LM): Yeah, you're gonna get there. You now have 2 milliradians to the south. Yep.

100 44 39 Mattingly: Okay, I'll take some of that out. That means I go to the south, right?

100 44 42 Young (LM onboard): Yes.

100 44 49 Mattingly: How's that? Right direction?

100 44 51 Young (LM): Yeah, that's got most of it.

100 45 13 Irwin: Go ahead.

100 45 21 Young (LM): You still got some more to the south you've got to get. Still 2 milliradians. Okay. That's got it, Ken.

100 45 32 Mattingly: Okay.

100 46 22 Mattingly: Okay, it looks like I'm picking up a rate in the opposite direction in the - - the in-plane component.

100 46 26 Young (LM): No, you're not - you're not - You don't have any rate yet. According to my needles.

100 45 32 Mattingly: Okay. All right.

100 46 43 Mattingly: This is very much like the simulator where, because of the dead band lags, it looks like it takes a long time to pick up one of those rates.

100 47 04 Irwin: Orion, this is Houston. We want you to get the rendezvous radar and the tracking light off as soon as it's feasible, to conserve power.

100 47 15 Young (LM): Roger. We will. It's not too feasible right now.

100 47 21 Irwin: Yes, we understand.

100 47 36 Mattingly: Okay, it looks like I may be a little more to the south.

100 47 39 Young (LM): Just a hair, Ken. Okay. You're at 2400 feet [730 metres] at 2 [feet, 0.6 metres, per second].

100 47 46 Mattingly: Okay.

100 47 50 Duke (LM onboard): He's going to need to thrust towards us a little bit.

100 47 51 Young (LM onboard): Yeah.

100 48 21 Young (LM onboard): He thrusts the opposite way we do. We're up down.

100 48 24 Duke (LM onboard): Yeah.

100 48 24 Mattingly: How about that rate to the south? It looks like it's building again. Okay.

100 48 29 Young (LM): Ken, our needles don't show it.

100 48 33 Mattingly (CM comm): Okay.

100 48 34 Duke (LM onboard): He never really got it all out.

100 48 46 Young (LM onboard): Better start using their -

100 48 49 Duke (LM onboard): Huh?

100 48 50 Young (LM onboard): Somebody better start using their brains and common sense here.

100 48 53 Duke (LM onboard): What do you mean?

100 48 55 Young (LM onboard): Or it'll blow the whole works.

100 49 05 Duke (LM onboard): You don't think this is right, what he's doing?

100 49 07 Young (LM onboard): Yeah.

100 49 15 Duke (LM onboard): You want me to stick that card back over there?

100 49 23 Mattingly: Hey, I show quite a drift rate now, John. Do you still show no out of plane?

100 49 29 Young (LM): Yeah, I don't show any, and I've got you boresighted in Att Hold, and I don't show any motion there either, Ken.

100 49 35 Duke (LM onboard): Where? Our needles say he's drifting south.

100 49 42 Young (LM): Just a little south, Ken.

100 49 44 Mattingly: Okay. It looks like it's pretty good bet. I'm going to take some of that out.

Public Affairs Officer: This is Apollo Control. Flight Director, Gerry Griffin, has instructed the CapCom to tell the crew that at acquisition of signal on Rev 15 - that's in spite of the next revolution - they'll be given a Go/No-Go for a landing on Rev 16. Hopefully be that time the situation will have resolved itself on the Thrust Vector Control System which drives the SPS. Apparently there is a problem in the yaw gimbal actuator in the Service Propulsion System. The decision has not yet been made, and hopefully will be made prior to the time of acquisition of signal on Revolution 15. Some 19 minutes remaining in this 14th revolution. Add to that 47 minutes of backside pass, and at - start of that rev we'll either be Go for landing (or) for immediate rendezvous (and) docking, and subsequent return home. This is Apollo Control at 100 hours, 51 minutes.

100 49 59 Duke (LM onboard): He's going off the bellyband.

100 50 00 Mattingly: Can you tell if I'm going to - maybe I put that in the wrong direction, although I'm sure that that was the right - South is to your left, isn't it?

100 50 12 Young (LM onboard): You betcha.

100 50 13 Mattingly (CM): Okay. We're going the right way, then.

100 50 18 Duke (LM onboard): Hey, wait a minute, Ken...

100 50 06 Young (LM): Whoa, Ken. You got it.

100 50 26 Duke (LM onboard): Okay, Ken. You were drifting south. That's right. You have to thrust north. You got it.

100 50 29 Mattingly: John, we've been going the right direction all along, then.

100 50 32 Young (LM): Yeah, you have. Yeah, don't worry about it.

100 50 34 Mattingly: It appears to be I'm still a little bit out of plane. I guess that's the sensitivity of the rendezvous radar.

100 50 37 Young (LM onboard): Yeah, don't worry about it.

100 50 55 Duke (LM onboard): Down to one foot [0.3 metres] a second. If he'd get a little bit more closing rate in, it'd be less gas.

100 51 07 Young (LM onboard): I think it would be too.

100 51 08 Duke (LM onboard): Huh?

100 51 09 Young (LM onboard): Let's call up Verb 63 again. Can we do that? No, I don't want to - I don't want to break lock.

100 51 17 Mattingly: Okay; how's my closure rate?

100 51 21 Young (LM): We're showing a foot a second on tapemeter. It isn't closing very fast.

100 51 24 Mattingly: Well, that's what I was just wondering. There could be a little more plus-X.

100 51 32 Mattingly: Okay, I'm going to put in a foot plus-X.

100 51 33 Young (LM): Okay. Say when and how much.

100 51 32 Mattingly: Okay? As long as we are using brute force, we might as well.

100 51 45 Young (LM): Okay.

100 52 00 Mattingly: Okay, that's about a foot.

100 52 01 Young (LM): Okay. You're at 2000 feet [600 metres] at 2 [feet per second, 0.6 metres, per second].

100 52 19 Young (LM): There you go. It worked.

100 52 22 Mattingly: How about that?

100 52 23 Duke (LM onboard): What was that?

100 52 24 Young (LM onboard): Tunnel light.

100 52 25 Duke (LM onboard): Oh.

100 52 56 Mattingly: I can see the LM in Earthshine now.

100 53 03 Young (LM): Okay, fine.

100 53 14 Young (LM): You're getting over behind us, Ken. You're going to have to - to thrust toward us a little more.

100 53 19 Mattingly: Okay, what's my range rate now?

100 53 23 Young (LM): You're at 2000 feet, but it's hardly closing at all.

100 53 24 Mattingly: Okay, give me another foot.

100 53 34 Mattingly: Okay, there's another foot per second.

100 53 44 Young (LM): Okay.

100 53 55 Young (LM): Now you're starting to build a rate to the north.

100 54 04 Mattingly: I don't think those [garble] are as good as we're using them in here.

100 54 08 Young (LM): Yeah, I - I don't think they're quite as good.

100 54 12 Mattingly: It looks like I need to start reversing my in-plane direction.

100 54 11 Duke (LM onboard): Yeah.

100 54 20 Mattingly: Okay, do I still have a positive closure rate?

100 54 23 Young (LM): Yep, 3 feet a second; 2000 feet. 1800 feet now [550 metres].

100 54 27 Mattingly: Okay.

100 54 XX Young (LM): 1800 feet now.

100 55 09 Duke (LM onboard): Old Antares.

100 55 39 Young (LM): Okay, Ken. There, you are moving north definitely.

100 55 42 Mattingly: Okay, I'm getting you centered back up in the COAS.

100 55 50 Young: Okay.

100 56 01 Duke (LM onboard): He's got to put that 05 back in to get - to get his orbit back up.

100 56 13 Mattingly: Okay, do you guys still have a closure rate?

100 56 15 Young (LM): Say again?

100 56 XX Mattingly: Do I still have a closure rate?

100 56 18 Young (LM): That's affirmative; 2 feet a second.

100 56 XX Mattingly: Okay. Looks like the old EMS is just sort of sitting here looking at itself.

100 57 10 Young (LM onboard): Okay, Ken. You do have a line-of-sight rate to north.

100 57 15 Mattingly: Okay, I'm going to go ahead and use the EMS - I mean the COAS on the sync because that's working out pretty good in here. Seems to be a more sensitive indicator of out of plane.

100 57 28 Young (LM): Okay, you've got 4 milliradians to the north. You're at 1500 feet now.

100 57 51 Mattingly: Okay. Just barely drifting in the COAS. It's pretty good here.

100 58 11 Young (LM): Okay; well, now, you have -

100 58 31 Young (LM onboard): Can you see me at all?

100 58 33 Mattingly: Yes, sir, in Earthshine I can see the whole LM now.

100 58 34 Young (LM onboard): Okay, fine.

100 58 35 Mattingly (CM): I'm afraid we're going to run out of Earthshine here before we get it completed. How's the closure rate now?

100 58 47 Young (LM): Still 2 feet a second, Ken. We're about 1400 feet [430 metres] now.

100 59 03 Mattingly: Okay. Man, that Moon in Earthshine is really something.

100 59 06 Young (LM): Okay; And I show you with 4 milliradians to the north, and I see you drifting slowly across the COAS to the north.

100 59 11 Mattingly: Roger. I didn't quite get it stopped.

100 59 30 Mattingly: That looks to me like that's fixed.

100 59 25 Young (LM): Okay, you're fixing it.

100 59 XX Mattingly: You still show some residuals?

100 59 36 Young (LM): Yeah, you're still 3 milliradians to the north.

100 59 XX Mattingly: Okay.

100 59 54 Irwin: Orion, this is Houston. We're showing about ten minutes to LOS, and I have some words for you on our general plan, when it's convenient.

101 00 04 Young (LM comm): Go ahead.

101 00 XX Irwin: Okay, when you come up on AOS, on the next rev, Rev 15, we'll give you a Go or No-go for another try, and we'd be looking at PDI on Rev 16. And at that time, we'd have pads for you and procedures. Over.

101 00 29 Young (LM): Okay. Fair enough.

101 00 38 Irwin: And, Casper; this is Houston.

101 00 43 Mattingly: Go right ahead.

101 00 46 Irwin: Roger. We want you to verify that you're in Auto Dump on the water. That's Pressure Relief in the number 2 position. That's vertical. And if you have an opportunity to get away from the controls there, we'd like you to manually dump the water to ten percent on the back side. That should require about 17 minutes. Over.

101 01 08 Mattingly: Okay. I am in Auto Dump and I'll have to wait until we get in daylight to go down there, I think.

101 01 19 Irwin: Okay, we copy.

101 01 20 Mattingly: I show about full, but I guess it isn't.

101 01 27 Young (LM): Okay, Ken. The line-of-sight rate is starting to - Have to thrust down a little - I mean, up a little.

101 01 41 Mattingly: Okay. How's my closure rate?

101 01 52 Young (LM): Two feet a second. You have it. You're at a thousand feet [300 metres] now, approaching [garble].

101 02 01 Mattingly: How's the out of plane?

101 02 02 Young (LM): It's starting to go to the south of here. Don't worry about it right now.

101 01 05 Mattingly: All right.

101 02 41 Young (LM): You got it, Ken. When you get in - when you get in...

101 02 50 Irwin: Orion, this is Houston. We would like you to configure for RCS Bravo only. Over.

101 02 58 Duke (LM): Roger. We'll open the Cross Feed and pull Main SOV A.

101 03 12 Duke (LM): We're configured.

101 03 45 Young (LM onboard): Why don't you turn out some lights, Charlie? I don't know -

101 03 47 Duke (LM onboard): Okay. How's that?

101 03 51 Young (LM onboard): Yeah. Okay.

101 03 53 Duke (LM onboard): Let me turn the numerics down a little bit.

101 04 15 Young (LM): Okay, Ken. You're about 990 feet [300 metres] now.

101 04 19 Mattingly: All righty.

101 04 26 Duke (LM onboard): What a time to be closing, pitch black dark.

101 04 38 Young (LM): 970 [295 metres]. You've got the line-of-sight rate. Okay; can you see me with the spotlight yet?

101 04 50 Mattingly: No, that's what I was looking to see, because we're going to lose Earthshine here in just a minute.

101 05 27 Young (LM comm): Okay, Ken. You've got to thrust down just a hair.

101 05 36 Young (LM comm): You get that thrusting down a hair?

101 05 39 Mattingly: Yeah, I'm not sure if that was the same [garble] you're talking about.

101 05 41 Young (LM onboard): Okay.

101 05 49 Mattingly: Does that fix it?

101 05 XX Young (LM onboard): No.

101 05 XX Mattingly: Right?

101 05 XX Young (LM onboard): That made it worse. That's making it worse.

101 05 XX Mattingly: It's really strange, it was sitting here in the COAS here, right in the middle.

101 06 14 Young (LM): You thrust a hair down and a hair to the north.

101 06 18 Mattingly: You're upside down compared to me, and when you say down you mean you're going - you're going down on me - is that correct?

101 06 30 Young (LM): I'm doing it from the needles. If you don't ro - if you haven't rolled from the last way you were doing it, we were doing it okay.

101 06 35 Duke (LM onboard): Yeah. That's right, Ken. We're going down with you. We'd have to thrust up, according to the needle.

101 06 44 Young (LM): Okay; it's 820 feet [250 metres] now.

101 06 52 Mattingly: Okay. It still doesn't seem like it does much. Okay; I show a line of-sight rate that's essentially killed.

101 07 12 Duke (LM onboard): That's about right.

101 07 13 Young (LM comm): Yeah. They're about killed for this close in.

101 07 18 Duke (LM onboard): He looks bigger than 800 feet [240 metres].

101 07 22 Young (LM onboard): Sure does. At night, all cats are black.

101 07 42 Duke (LM onboard): [Garble] one of those cycle slips of that radar.

101 07 54 Young (LM onboard): What's your VHF reading, Ken?

101 08 04 Mattingly: One-four.

101 08 02 Young (LM onboard): 0.147

101 08 03 Mattingly: Yes, sir.

101 08 04 Young (LM onboard): Okay; we're 750 feet [230 metres] here.

101 08 06 Mattingly: How much?

101 08 08 Young (LM onboard): 750.

101 08 10 Mattingly: Okay, I can see your image is about 2 degrees, now.

101 08 29 Irwin: 16, this is Houston. We're showing about two minutes to LOS, now, if you'll give us a range and range rate, and, Ken, perhaps you could repeat it for us.

101 08 38 Young (LM onboard): Okay; 710 feet [215 metres], closing at 2 feet a second, rates essentially nulled.

101 08 47 Mattingly: Did you copy that, Houston? The range is 710 feet, 2 feet per second, rates nulled. Houston, did you copy Casper?

101 09 12 Irwin: Roger; we copied down here. Thank you.

101 09 19 Mattingly: Okay.

101 09 16 Young (LM onboard): Okay, Ken. I can see the whites of your eyes. I can see you every time your light flashes. And every time my light flashes, it flashes off your probe.

101 09 36 Mattingly: Uh huh. Let me turn my spotlight now.

101 09 38 Young (LM onboard): You ought to have me now. Does it do you any good?

[CM tape on until 101 59 29]

101 09 54 Mattingly (CM): Yeah, I can tell I got you, but it's a poor competitor for Earthshine.

101 09 56 Young (LM comm): Well, we ain't got any Earthshine, old buddy.

101 10 02 Mattingly: Beg your pardon.

101 10 03 Young (LM comm): I say, we're gonna lose Earthshine here in a minute.

101 10 05 Mattingly: Roger. It will all of a sudden look very nice.

101 10 26 Mattingly: You can rendezvous under these conditions very nicely, the problem being that you've got to keep referring to the reticle to get some kind of range, I because there's just no - you still don't have enough good depth perception to tell where you are.

101 10 37 Young (LM onboard): Right. You're gonna be docking with - you're just slowly drifting to the north. You got the vertical line-of-sight rate killed.

[LM tape off at 101 10 46. Not resumed until much later]

101 10 47 Mattingly: Okay, in order to have good comm, - man, you just disappeared - got the spotlight on. I tell you, the spotlight isn't nearly as good as Earthshine. I'm really surprised.

[End of Tech transcript until 101 59 34]

Public Affairs Officer: This is Apollo Control. We have loss of signal with both vehicles as they pass behind the Moon during the end of revolution number 14. At the start of Revolution 15 the crew of Apollo 16 still at this time station-keeping in the two vehicles. [They] will be given a Go/No-Go decision for powered descent and landing during Rev 16 which will be some 4 hours from now. If the decision is [for a] go, all of the maneuver timelines will have to be read up to the crew during the front-side pass of revolution number 15. If the decision is [for] no landing, then the crew would proceed to rendezvous, dock, and prepare the spacecraft for return home. To recap the situation, the planned circularization maneuver by the Command Service Module back prior to AOS on Revolution 13 was aborted by Ken Mattingly when he discovered that the backup system, [in] the Stabilization and Control System which in turn controls the gimbal actuators on the Service Propulsion System, apparently had a malfunction in the yaw direction - in other words the driver that moves the engine bell left and right apparently had some excursions of several degrees and fairly rapid amplitude, [in] fairly rapid succession. Simulations are underway here at Houston and the Command Module simulator and some structural tests are underway at this time at the manufacturers plant [at] Downey in California to determine if indeed the problem would present any structural hazard to the spacecraft should the backup SCS system have to be used in SPS burns. Keep in mind, please, that the primary system - the G&N system - is still in perfect condition, but the mission rules call for both systems being operational before we have a "go" for landing. Some 44 minutes remaining now until acquisition on Rev 15. During the next three quarters of an hour the decision should be firmed up on a go for landing Go/No-Go decision. And at 101 hours, 14 minutes Ground Elapsed Time into the mission of Apollo 16, This is Apollo Control.




Day Five Part Three
"I be a sorry bird".
LM and CM Problems,
Revs 12 and 13

Journal Home Page

Day Five Part Five
Clearance for PDI - Again -
and Landing, Revs 15 and 16