173:42:27 Worden: Dave, you want to verify that the dump valve's in Auto?
173:42:33 Mitchell: Roger. Standby one. [Pause.]
173:42:39 Scott: Verify.
173:42:40 Worden: Okay, I'll go ahead and start equalizing the pressure.
173:42:41 Scott: Okay, good. [Long pause.]
173:43:12 Mitchell: And, Falcon; Flight - or rather, Falcon, Houston. FIDO's on pins and needles for your TPI solution if you can get a moment to read it to us.
173:43:23 Scott: Rog, we'll do it right now. [Long pause.]
173:43:38 Scott: Okay, Houston. I assume that you got the recycle before we went around the corner there.
173:43:43 Mitchell: That's affirm.
173:43:47 Scott: Okay, on the final [rendezvous burn] comp[utation], I'll read PGNS, AGS and CMC, if you are ready to copy them, in that order, in local-vertical coordinates.
173:43:56 Mitchell: Roger. Ready.
173:44:00 Scott: Okay. For the PGNS: plus 70.3, plus 5.9, minus 17.7. For the AGS: plus 70.4, plus 5.9, minus 19.1. The CMC: minus 69.1, minus 6.1, plus 16.1. We burned the PGNS on time, and we had about a 4-foot-per-second overburn on the APS which we trimmed out to 2/10ths.
173:44:41 Mitchell: Copy. [Pause.]
173:44:47 Scott: Okay, the residuals were - for the PGNS after the trim - were plus .2, plus .2, and minus .4.
173:44:56 Mitchell: Copy. And assume midcourses were...
173:45:02 Scott: Rog. We'll give you those too. [Long pause.]
173:45:27 Scott: Okay, and I'll give you the same answers for midcourse 1 if you're ready to copy, Houston.
173:45:31 Mitchell: Okay.
173:45:36 Scott: Okay, PGNS was minus 1.1, 0, and minus 1.1. AGS was minus 1.5, 0, and minus 3.0. CS - CSM, plus 1.5, minus .2, plus 1.9. And we burned the PGNS solution to 0, .1 and .2.
173:46:03 Mitchell: Thank you, Dave, that's fine. Appreciate it.
173:46:07 Falcon: Okay, you want midcourse 2?
173:46:11 Mitchell: No, we'll take your PGNS - we'll take all the rest of them; we'll get them later.
173:46:17 Scott: Okay, fine. It was pretty smooth all the way, everything looked nice, and the data went in very well, and I thought it was a super rendezvous.
173:46:27 Mitchell: Very good. Getting home's the main thing.
173:46:32 Scott: Yeah, but you know, these systems are just magnificent.
173:46:36 Mitchell: Yeah, they sure are, Dave. Okay, we suggest you press right along with your transfer and cleaning up.
173:46:46 Scott: Rog. We're in work right now.
173:46:48 Mitchell: And whenever Jim's ready to do the targeting, we'll read him a PAD on that.
173:46:56 Scott: Okay, stand by, we'll give you a call. [Long pause.]
This is Apollo Control at 173 hours, 47 minutes. The docked Falcon and Endeavour are in orbit, 64.1 by 53.8 nautical miles [118.7 by 99.6 km].
173:47:42 Irwin: Okay, Ed. I'm ready to copy the impact PAD.
173:47:49 Mitchell: Okay, understand you're ready for the LM impact PAD, Jim; is that correct?
173:47:56 Irwin: Yes, if that's what you have to pass.
173:47:58 Mitchell: Okay, it's a P30 PAD. 179:06:22.50; Noun 81s, minus 0121.9, plus 0056.0, plus 0148.8; 0071.1, minus 0037.1, 0200.3; 1:27; 047, 174. The rest is NA. And the LM weight: is 5444. [Pause.]
173:48:52 Irwin: Roger, Readback for P30 PAD. 179:06:22.50; minus 0121.9, plus 0056.0, plus 0148.8; 0071.1, minus 0037.1, 0200.3; 1:27; 47, 174. And LM weight is 5444.
173:49:22 Mitchell: Good readback, Jim. [Long pause.]
173:49:43 Mitchell: And, Falcon; Houston. The computer's yours.
173:49:51 Irwin: Rog.
173:49:53 Mitchell: And we want to leave it in Data, of course. [Pause.]
173:50:01 Scott: Okay, we'll leave it in Data. It's all yours now. [Long pause.]
173:50:27 Mitchell: And, Endeavour; Houston. Before you get LOS and get too busy with the transfer, I need to give you a camera photo PAD for the next pass. [Pause.]
173:50:41 Worden: Okay. Go ahead, Houston.
173:50:45 Mitchell: Okay, this is the one at 174:50, Al. T-start - it's for the Map Camera - T-start, 174:50:04; T-stop, 175:49:36. Your Image Motion BP plus 4 at T-start, and BP at 175:30:00. And your Pan Camera photo PAD, to be copied at 175:20. T-start, 175:34:32; T-stop is 36:52. [Pause.]
173:51:42 Worden: Roger, Ed. Understand Mapping Camera photo PAD is T-start, 174:50:04; T-stop, 175:49:26. And at T-start, you want Image Motion to go barber pole plus 4.
173:51:59 Mitchell: That's affirm.
173:52:00 Worden: And, at 175:30, understand you want Image Motion to go to barber pole.
173:52:07 Mitchell: That's affirm, Al. And the correct time for the T-stop on that was 175:49:36. [Pause.]
173:55:12 Worden: Yeah, it's pressurized, Jim. Can you read me? Okay, tunnel's pressurized and I'm up in it now, checking the latching.
The cabin pressures are equalized, now.
173:57:41 Scott: Hello, Houston. The Falcon is back on its roost and going to sleep.
173:57:47 Mitchell: Very good. [Pause.]
173:57:54 Scott: She's all yours now, Ed. We're going to go off comm and put her to bed.
173:57:59 Mitchell: Okay, one item, Dave. You're not marking these bags before you head them down, are you.
173:58:10 Scott: The bags are all numbered. We've got the collection bags in the cover bags with the proper numbers on them, and that was all we're planning to do.
173:58:20 Mitchell: Okay, you're not helping him with the stowage when you pass them in, are you? I would change your Flight Plan if you did; otherwise, I'll just give it to him. [Pause.]
173:58:33 Scott: Well, I guess the best thing would be to go ahead and give it to him, because we'll just pass them over then.
173:58:39 Mitchell: Okay, I've given them to him already. Thank you.
173:58:43 Scott: Yeah, that fine. He - he's got a much better handle on the stowage over there anyway than we do.
This is Apollo Control at 173 hours, 59 minutes. Dave Scott and Jim Irwin are powering down Falcon now. We'll be off communications for some time. They'll power down the LM and transfer the equipment and the samples into the Command Module.
174:02:27 Mitchell: Al, we observed when you were in P79, just before the docking, that you got a POO DOO. Do you have any words on that. [Pause.]
174:02:39 Worden: No, I don't, Ed. [Long pause.]
174:02:55 Mitchell: And, Endeavour; Houston. We're going to have to update your Flight Plan with a couple of items before you go around the corner, whenever you can get around to it.
174:03:07 Worden: Okay, Ed, let's go ahead and do them now.
174:03:11 Mitchell: Roger. And, Al, give us a Verb 74 when I'm talking to you.
174:03:22 Worden: Rog. Verb 74.
174:03:24 Mitchell: Okay, the first Flight Plan update is the - at 174:12. [Pause.]
174:03:37 Worden: Okay, go ahead.
174:03:39 Mitchell: Okay, where it says the "Mapping Camera Laser Experiment Covers, Open," et cetera, et cetera. Delete that.
174:03:50 Worden: Rog. Go ahead.
174:03:50 Mitchell: And the second line after that, the "Map Camera Track," et cetera, et cetera; delete that, we're going to move those to 174:40. [Pause.]
174:04:11 Worden: Okay, understand.
174:04:13 Mitchell: Okay, down a little bit in the next group of words where it says "Laser Altimeter, On" at 174:17; we're going to scratch that. [Pause.]
174:04:27 Worden: Okay, scratch Laser Altimeter.
174:04:30 Mitchell: We're going to move that to 174:49. [Pause.]
174:04:42 Worden: Roger. Move to 174:49.
174:04:45 Mitchell: Okay, and at 175:49, going to add a - another Laser Altimeter, Off. [Pause.]
174:05:07 Worden: Rog, understand. At 175:49, Laser Altimeter, Off.
174:05:13 Mitchell: Okay, the next item is at 1 - Stand by on that a minute. And at 175:54 [means 175:58], delete the Laser Altimeter, Off. [Long pause.]
174:05:37 Worden: Understand. At 175:58, delete Laser Altimeter, Off.
174:05:46 Mitchell: That's affirm.
174:05:48 Worden: Okay.
174:05:49 Mitchell: And at 176:02, the next page, right after all those words, we want to add in the "Map Camera" - that's about 176:02 - "Map Camera Laser Experiment Covers, Close, Talkback's barberpole slash gray, then Off." [Long pause.]
174:06:25 Mitchell: Looks like that item came down there about 4 minutes later, Al. [Pause.]
174:06:35 Worden: Roger that, I see it now.
174:06:38 Mitchell: Yeah, I just now saw it, too. I presume they want it moved up there a few minutes. And at 178:02; Oh, sorry about that - at 177:56, put in a "Logic Power, two, Off." [Long pause.]
174:07:15 Worden: Okay, I understand Logic Power, both of them, Off, at 177:56.
174:07:40 Worden: Delete "Laser Altimeter, On," at 178:02.
174:07:44 Mitchell: Okay. And at 179:40, following page, delete "Laser Altimeter, Off" - and about 179:41, delete those two lines, "Map Camera Laser Experiment Covers" and "Logic Power, two, Off." Delete those.
174:08:02 Worden: Okay. Delete the three lines at 179:40, "Laser Altimeter," "Mapping Camera Covers," and "Logic Power, Off." Delete those three lines.
174:08:12 Mitchell: Okay. I think we got them all that time, Al. Thank you.
174:08:15 Worden: Okay.
174:09:17 Mitchell: And, Endeavour; Houston. If you can holler at Dave and Jim, remind them that - to get their radiation meters out of their pockets. We'd still like those readings we didn't get earlier.
174:09:34 Worden: Roger, Houston.
174:10:48 Mitchell: Okay, Endeavour; Houston. Can we have Auto on the High Gain [Antenna]? And request Falcon to go to Aft Omni as he goes over the hill, or after he's over the hill.
174:11:02 Worden: Okay. You want Falcon to go to Aft Omni.
174:11:04 Mitchell: Yeah, at LOS. And you're about 3 and a half minutes from LOS now.
174:11:16 Worden: Okay, I'm in Auto and they're going to go to Aft Omni at LOS.
174:11:20 Mitchell: That's affirm. [Pause.] And ask them when they do that to verify Track Mode, Slew.
174:13:53 Mitchell: And, Endeavour, we're about 40 seconds from LOS; see you on the other side.
174:14:00 Worden: Okay, Ed. Thanks much.
This is Apollo Control at 174 hours, 14 minutes. We've had Loss Of Signal on both spacecraft as they go behind the Moon, and on the 49th revolution for Endeavour. As we acquired Falcon on this pass, Dave Scott reported a good Terminal Phase Initiate burn. He reported he had performed two small midcourse corrections, and at that time could see the Command Module. The braking in the rendezvous went well. Al Worden brought the television up a few minutes early. We lost the picture for a while when the High Gain Antenna went to Wide Beam while Worden was maneuvering Endeavour for its inspection by Dave Scott and Jim Irwin. The picture came back in time for the docking. We copied the time of hard dock at 173 hours, 36 minutes, 27 seconds. We're showing the spacecraft in a lunar orbit of 64.1 by 53.8 nautical miles [118.7 by 99.6 km], with an orbital period of 1 hour, 58 minutes, 33 seconds. The crew of Falcon has powered down the Lunar Module and is preparing to transfer the lunar samples into the Command Module. We'll reacquire both spacecraft in 43 minutes from now. At 174 hours, 16 minutes; this is Mission Control, Houston.
This is Apollo Control at 174 hours, 58 minutes. We're a little over 30 seconds away from Acquisition Of Signal. There will be a news conference at 8:30 am tomorrow on the lunar surface activities conducted by astronaut Jack Schmitt. This news conference will be in the main auditorium. We'll stand by now for first words on this 50th revolution.
175:13:44 Mitchell: 15, Houston. We're having a lot of trouble with the LM comm. Apparently, we're right at the midst of the Omni. Let's try aft again, please. [Pause.]
175:14:00 Worden: Houston, I was talking with Dave. Say again.
175:14:03 Mitchell: Roger. Let's try the LM Aft Omni again, please.
AS15-M-1913 - Metric Camera image of the northern shore of Mare Fecunditatis including Rimae Apollonius and craters Abbot and Bombelli. Image taken at about 175:16. (250 megapixel version), (labelled version) - Image by NASA/ASU.
175:22:09 Mitchell: Al, we're going to change your Mapping Camera procedures. I'm going to call them to you on time rather than read them to you now. So press on, and I'll give you a warning here in about 5 or 6 minutes.
175:22:23 Worden: Yeah, that'd be fine, Ed. Just give me a couple minute warnings, so I can get over to the camera. As you probably know, the LEB [Lower Equipment Bay] Timer's not working.
175:22:31 Mitchell: Rog. I'll keep you posted on time; press on.
175:22:37 Worden: Okay.
AS15-M-1933 - Metric Camera image of northern Mare Tranquillitatis including craters Fabbroni, Vitruvius and Beketov. Image taken at about 175:24. (250 megapixel version), (labelled version) - Image by NASA/ASU.
175:25:02 Mitchell: Al, we observe that your - you've got P00 up instead of P20. Better check your attitude and get her back in P20, and let's see if our camera is pointed at anything.
175:25:15 Worden: Okay. [Long pause.]
175:25:46 Worden: Houston, 15.
175:25:48 Mitchell: Go ahead.
175:25:52 Worden: Rog. That just happened about 15 seconds ago. You must have caught it just as it went to P00. And I don't think we're even out of the deadband.
175:26:00 Mitchell: Very good. And Al - just stand by. We still got a couple of minutes, yet. What I'm going to do is have you retract the Mapping Camera with it still running and then turn it off. We're running a little test on it. And I'll call that for you in a couple of minutes.
175:26:20 Worden: Okay.
P20 is the orbital rate program which we want for the camera operations in the SIM bay.
175:28:21 Mitchell: Apollo 15, Houston. Stand by to retract the Mapping Camera.
175:31:54 Mitchell: Okay. Apollo 15, Houston. Turn your Mapping Camera, Off. [Pause.]
175:32:05 Worden: Okay, Ed. Mapping Camera going Off.
175:32:07 Mitchell: Roger. The Laser Altimeter, Off. And the Map Camera Laser Covers, Closed.
175:32:14 Worden: Okay, Laser Altimeter's Off.
175:32:19 Mitchell: And I'll have the Pan Camera T-start here in just about 2 minutes. I'll call you and give you 15 or 20 seconds warning.
175:32:28 Worden: Okay.
175:34:18 Mitchell: 15, Houston. Stand by for T-start on the Pan Camera. [Pause.]
175:34:28 Worden: Standing by.
175:34:32 Mitchell: Mark. T-start, Pan Camera.
AS15-P-9811 - Panoramic Camera image of Hadley Rille, west of the landing site. This is a stereo companion to 9816. A 385 megapixel PNG format version can be had from the ASU Apollo Image Archive - Image by NASA/ASU.
AS15-P-9816 - Panoramic Camera image of Hadley Rille, west of the landing site. This is a stereo companion to 9811. A 385 megapixel PNG format version can be had from the ASU Apollo Image Archive - Image by NASA/ASU.
AS15-P-9817 - Panoramic Camera image of Palus Putredinus. This is a stereo companion to 9822. A 385 megapixel PNG format version can be had from the ASU Apollo Image Archive - Image by NASA/ASU.
AS15-P-9822 - Panoramic Camera image of Palus Putredinus. This is a stereo companion to 9817. A 385 megapixel PNG format version can be had from the ASU Apollo Image Archive - Image by NASA/ASU.
Detail from AS15-P-9814 - Hadley Base post ascent. Click on image for larger unlabelled version.
175:57:13 Mitchell: Rog. Would you ask Dave and Jim to make sure that we go ahead and get steps 4 and 5 on page 14 of their checklist before LOS here? And then, soon as we get into attitude, we can take a look at all this before we go LOS. We got about 16 minutes.
175:57:37 Worden: Okay, understand. That's steps 4 and 5 on page 14.
175:57:40 Mitchell: That's affirm. [Pause.]
175:57:52 Mitchell: And, Apollo 15; Houston. Also, go ahead and get the P30 and et cetera, et cetera. [Pause.]
175:58:05 Worden: Rog. Understand. Go ahead and get the P30 in the LM.
175:58:08 Mitchell: And there is no update to the TIG. It's good as given to you earlier. [Pause.]
175:58:17 Worden: Rog. Understand. TIG is good. [Pause.]
175:58:30 Mitchell: And, Al, stand by to turn the Gamma-ray, Gainstep, Shield, On.
175:58:38 Worden: Gamma-ray, Shield, On.
175:58:40 Mitchell: Okay, Mark, On and let's take the Map Camera, On switch to Standby and the Map Camera, Image Motion, Off. [Pause.]
175:59:01 Worden: Okay, Ed. Thank you much for your help. [Pause.]
175:59:09 Irwin: Oh, Ed, I'm back on comm, over in the Falcon.
175:59:13 Mitchell: Okay, Jim. Sounds good. Should be in attitude in just a minute. And your angles, 205 and 70, as in the Flight Plan, should be good. And we're about 13 minutes from LOS.
175:59:32 Irwin: Okay. Do you have any updates for me before we have LOS?
175:59:37 Mitchell: Negative. All we wanted to do was just - the guidance system's state vector's okay and configured before LOS, and I don't believe we have an update. I'll check. [Long pause.]
176:00:16 Mitchell: Falcon, Houston. We'd just like to complete down through step 1 or 2 of configure AGS before LOS. And, Endeavour, if you can give us an Accept, we'll shoot you an uplink before LOS.
176:00:34 Worden: Okay, getting Accept.
176:00:38 Irwin: Falcon copies. [Pause.]
176:00:48 Worden: You got Accept.
176:00:49 Mitchell: Understand.
176:02:40 Irwin: Ed, can you get for - the P30 load here for me as I go through it.
176:02:45 Mitchell: Okay, stand by one. [Pause.] Okay. Go ahead. Got the first one.
176:03:04 Irwin: Okay, how does that look?
176:03:10 Mitchell: Looks good.
176:05:02 Mitchell: Looks good here, Jim.
176:05:06 Irwin: Okay, I'll [press] Pro[ceed] on this one. [Long pause.]
176:05:46 Irwin: Okay, I'm going to go to P00, Ed.
176:05:47 Mitchell: Rog, Jim. That one looks okay, too. I don't see much of it.
176:05:54 Irwin: That's right. [Pause.] Okay, do we have a Go for closeout?
176:06:03 Mitchell: Give us a 470 readout on the DEDA [Data Entry and Display Assembly, part of the AGS], please.
176:06:09 Irwin: Okay. You have it. [Long pause.]
176:06:24 Mitchell: Okay. And, Jim, can you verify that you've done all of step 2 on the comm?
176:06:31 Irwin: Yes, I meant Slew on the Track Mode. [Long pause.]
176:06:51 Mitchell: Okay, Jim. You're Go for closeout. The next time we see the LM, you'll all be buttoned up. So suggest you make a very careful check of the items from now on.
176:07:03 Irwin: Okay; thank you, Ed.
176:07:08 Mitchell: And, Endeavour. It's your computer.
176:11:23 Mitchell: Okay, Endeavour, Houston. We're a minute and 20 seconds from LOS. Your ascent CapCom's going off duty, and I'll see you back on Earth. It's been a lot of fun getting you up here.
176:11:38 Worden: Okay, Ed. You're - thanks a million, pal. You've been a great help, and it was fun talking to you.
176:11:43 Irwin: Hey, Ed; Falcon. Looks like we just about got things cleaned up here.
176:11:47 Mitchell: Very good, guys. We'll see you in a few days. Thanks a lot.
176:11:53 Worden: Okay, Ed, thank you.
This is Apollo Control at 176 hours, 12 minutes; and we've had Loss Of Signal on the 50th revolution. Dave Scott and Jim Irwin still in the Lunar Module but preparing to close it out. By the time we reacquire, they will be back in the Endeavour with the Lunar Module set up for jettison and later deorbit burn and impact on the lunar surface. During this pass, they transferred the lunar samples to the Command Module. Al Worden remarked they were doing some house cleaning, obviously a lot of dust and dirt comes up with those samples and they use the vacuum cleaner to clean up the cabin after the transfer. Al Worden in Endeavour conducted more orbital science during this pass while Dave Scott and Jim Irwin were configuring Falcon for the deorbit. Here in the Control Center, Flight Director Milt Windler is preparing to hand over to Flight Director Glynn Lunney and his team of flight controllers. We're estimating the change of shift news conference for 5:15 pm Central Daylight Time. At 176 hours, 14 minutes; this is Mission Control, Houston.
This is Apollo Control at 176 hours, 23 minutes. The change of shift briefing scheduled for 5:15 has been canceled. To repeat, the change of shift briefing scheduled for 5:15 has been canceled. And to repeat an earlier announcement, a news conference on lunar surface activities will be held at 8:30 am tomorrow in the main MSC auditorium. Astronaut Jack Schmitt, the backup Lunar Module Pilot for Apollo 15, will be present at that news conference. This is Mission Control, Houston.
This is Apollo Control at 176 hours, 56 minutes. We'll be reacquiring the Command Module Endeavour, still docked with the Lunar Module Falcon, in about 2 minutes. At that time we expect that all three crewmen will be buttoned up inside the Command Module, and on this revolution will be preparing to jettison the Lunar Module and perform a small separation maneuver with the Command Module prior to LM impact. Glynn Lunney, the Flight Director for this shift, has completed a review of the status of the mission with each of his flight controllers, and, essentially, that status is as follows: For the Command Module, during the evening, the SIM bay will have the following experiments deployed; the Gamma-ray and Alpha Particle sensors; that'll be on this coming revolution. However we will not be getting data from those two sensors because the spacecraft will be in the separation attitude, which is not a suitable attitude for recording the particle data, and the gamma-ray data. During the sleep period, Al Worden will wear the lightweight headset and will have the watch to give Jim Irwin and Dave Scott maximum opportunity for a good night's sleep. In the way of continuing problems, the Laser Altimeter in the Scientific Instrument Module bay is still not functioning and we are about to write that off as broken. We don't expect that it will begin functioning. The Pan Camera - the Laser Altimeter, by the way, is used with the Mapping Camera to provide altitude information on each of the frames that is shot. The Panoramic Camera is generally functioning well. However about 1 frame out of 10, or about - actually about 20 per cent of the frames shot with that camera, are, we think, being smeared because of a problem with the sensor, called the A over H [means V over H] sensor, which senses the altitude at which a photograph is taken and rocks the camera on a pivot to compensate for the motion, and about 1 frame out of 8 or 9, this sensor is apparently sending either the wrong command, or the command is not being processed properly and the rocking motion is not as it should be and the frame is apparently being smeared, but all the rest of them would appear to be good frames. The Mass Spectrometer; we continue to have a problem with the boom. It doesn't appear to be a serious problem at this time. The instrument itself is functioning very well, providing very good data. We have, on several occasions when retracting the boom, the 24-foot [7.3-metre] boom that the sensor is mounted on, have found that the retraction is slower than we would expect, which gives an indication that perhaps it's hanging up. And, other than that, all of the SIM bay instruments are functioning well and providing excellent data. We just had a call to the crew. We'll stand by for that.
176:59:38 Parker: Apollo 15, Houston. Over.
176:59:47 Scott: Hello, Houston; 15. How are you?
176:59:49 Parker: Roger. Doing fine down here. Can you fellows confirm LM closed out and ready for jett[ison of LM].?
176:59:59 Scott: Rog. LM's closed out, and we're just now running our pressure integrity check, and we'll be all set in a jiffy.
177:00:06 Parker: Roger.
Dave Scott reporting that the LM is ready for jettison on time. The Spacecraft Communicator on this shift is astronaut Robert Parker. During the LM impact, Doctor David W. Streinway, Chief of the Geophysics Branch at the Manned Spacecraft Center, will be available in the MSC News Center briefing room to provide background information and answer questions on the LM impact and the seismic data that is received. That will be at 8 pm in the MSC News Center briefing room. Also, in the way of briefings, tomorrow morning at 8:30 am, there will be a lunar surface science briefing with astronaut Jack Schmitt. And that will be at 8:30 am in the main auditorium of Building 1. Also at 10 am, there will be a subsatellite briefing given by TRW. At the present time Apollo 15 is in an orbit of 52.7 [nautical miles, 97.6 km] at its low point with a high point, or apocynthion of 64.8 [nautical miles, 120.0 km].
177:10:11 Slayton: Say, Dave, beautiful job there today all the way around. Hey, one quick question - how come you guys need plugs for those suits?
177:10:22 Scott: Well, because, apparently, the LCG connection on the inside won't hold an air seal, so we're getting them taken care of with these special - extra little blue plugs we got that are airtight on the inside. [Long pause.]
177:11:13 Scott: At least that's our first guess of - of why we didn't get a good suit integrity check or didn't even get a good buildup in the suit pressure.
177:11:22 Slayton: Rog. We - we had a complete misunderstanding on that, so that's the reason I asked the question, because we thought those plugs only were required when the LCG was not on. We're trying to crack that one for you down here, Dave. There's something screwy here. [Pause.]
177:11:41 Scott: Okay. Well, we'll put these plugs in and run another pressure integrity check and see how it works.
177:11:46 Slayton: Rog.
177:13:35 Parker: 15, Houston.
177:13:41 Scott: Houston, 15. Go.
177:13:43 Parker: Roger, Dave. You guys talking about inside plugs or outside plugs?
This is Apollo Control. The plugs that are being discussed between Dave Scott and Donald K. Slayton, Director of Flight Crew Operations at the Manned Spacecraft Center, is a Liquid Cooling Garment plug. It plugs the inside of the hole or the feed thru in the suit where the water is normally brought into the suit from the backpack, the Portable Life Support System [PLSS], Of course, in suited operations inside the spacecraft, the backpack is not required and there is a plug on the inside of the suit that should seal this. Apparently Scott and Irwin were having some problems getting their suits to maintain pressure and were checking this - this particular plug. Just a few moments ago the EECOM, Environmental and Electrical systems engineer for the Command Module, reported that it appeared from the telemetry data that they had gotten the problem squared away and were getting a good pressure integrity on the suits. We'll continue to follow the situation, there is no particular problem as far as the LM jettison is concerned. If the jettison is somewhat late we can make up the difference by the time of ignition for the deorbit burn, and still get impact at the desired point.
177:18:28 Scott: Okay, Houston, 15. We've got a good suit circuit now.
177:18:33 Parker: Roger. We've been looking at it; copy, agree.
177:19:44 Parker: And, 15, we're still looking for an X-ray/Alpha Cover door, Closed. [Pause.]
177:19:57 Scott: Okay. Stand by one, Houston.
177:19:59 Parker: Roger. [Long pause.]
177:20:11 Scott: Okay, Houston. The X-ray/Alpha door is Closed.
177:20:15 Parker: Copy.
The spacecraft is now in the proper attitude for the separation - jettison and separation. And you heard Dave Scott report that, and we confirmed through telemetry on the ground, that their suits are now holding pressure as they should. Apparently they've gotten problem, whatever it was, with the...
177:21:33 Worden: Houston, 15.
177:21:34 Parker: Go.
177:21:39 Worden: Okay, we're ready to Arm the Logic.
177:22:02 Parker: Roger. You're Go for Pyro Arm. [Pause.]
177:22:06 Worden: Roger. [Long pause.]
We do have a good seal on the plugs for the liquid-cooled garment fittings on Irwin's and Scott's suits. And we're moving toward the LM jettison at 177 hours, 20 minutes, 33 seconds and separation 5 minutes later at 177:25:33. We're counting down to separation - rather to jettison, in 2 minutes, 47 seconds.
177:23:44 Scott: Okay, the LM/CM Delta-P doesn't look exactly right to us. What do you think?
177:23:49 Parker: Stand by. [Long pause.]
177:24:32 Parker: 15, Houston. We'd like to get another pound [per square inch of pressure] out of there. We're showing about 3.5 [psi, 24 kPa] in there.
177:24:42 Scott: Okay. We had a suspicion that possibly the LM overhead dump valve was open, and it might be.
177:24:54 Parker: We don't think so down here.
177:25:00 Scott: Okay. Well, we'll go to Tunnel Vent for a little longer, must just be slow then; we've been in it for probably about 15 minutes.
177:25:15 Parker: Copy. [Long pause.]
177:25:27 Parker: 15, what position are you in when you're reading that out, in Vent or in Delta-P?
177:25:34 Scott: Delta-P.
177:25:37 Parker: Roger.
177:25:43 Scott: It's up to about 2.3 now, and I've been holding it in Tunnel Vent. [Pause.]
177:25:59 Parker: 15, we'll take that. It'd take too long to get it down, we believe. So let's press on with Jett at that pressure.
177:26:09 Scott: Okay, well, the strange thing about it is that we had it up to about - oh 2.7 or 2.8 at one time and then went back to LM/CM Delta-P, and for some reason it [the pressure] built back up in the tunnel. And, I guess the only conclusion we could come to was - from the LM, 'cause the hatch is pretty simple and secure in here. [Long pause.]
177:26:47 Parker: Dave, we think that the increase in the cabin pressure during the suit integrity check could have raised it from - from your side.
177:27:11 Parker: [Stand] by, Dave; confusion reigns down here.
177:27:14 Scott: [Thinking out loud] Have you seen any ch - Well, I guess it sort of does up here, too. I wonder if you see any difference in the - you can't read the tunnel, though, can you? [Long pause.]
177:28:24 Parker: And, 15; this is Houston. We'd like to verify that you did get a good hatch integrity check back there a ways. [Pause.]
177:28:36 Scott: Yes, that's affirm. We got a good hatch integrity check, but - I guess what I'm thinking is there's - you know, there could be something in the seal there. And perhaps the thing to do would be to repressurize the tunnel and pull the hatch down, and take a good close look at the seal and then stick it back in. It shouldn't take too long. [Long pause.]
177:29:33 Parker: Apollo 15, Houston. That seems to be about the best conclusion we can come to down here, but we're - [we'd] kind of like to go into a hold briefly. Another indication is that we would - we are seeing the LM cabin holding steady and not using any oxygen from the ascent tanks, which seems to say that we're not leaking into the tunnel from the LM.
177:30:02 Scott: Okay, understand.
177:30:08 Irwin: Do we? [Long pause.]
This is Apollo Control. Recapping our situation at the moment, we're going to hold off on the LM jettison until we've gotten a more fuller, more complete understanding of the pressure rise in the LM tunnel. We've seen a slow pressure rise in that tunnel.
177:30:44 Parker: 15, Houston. We'd like to verify that the pressure equalization valve is closed.
177:30:54 Scott: That's verified; it's closed and on the yellow stripes.
177:30:58 Parker: Roger. [Long pause.]
177:31:32 Parker: And, 15, we'd like to back out of your Pyro Arm situation right now. [Pause.]
177:31:43 Scott: Okay, Houston; 15. Pyro Arm is Safe, Logic is Off, and the Pyro Arm circuit breakers are pulled.
177:31:50 Parker: Copy. [Long pause.]
177:32:22 Parker: 15, can you give us a LM/CM Delta-P reading at this time, please?
177:32:31 Scott: Okay, right now it's 3.0.
177:32:33 Parker: Copy, 3.0.
177:32:38 Scott: And, I've had the valve in Tunnel Vent for the last 5 minutes or so.
177:34:40 Parker: Apollo 15, Houston. Recommendation right now is to stop the - the LM Tunnel Vent, and then we will sit and monitor the CM/LM Delta-P for a short while to see what happens to it. And, after that, we're still considering opening up the tunnel to check the seal. Over.
177:35:03 Scott: Okay, we're in LM/CM Delta-P right now, and it's reading about 3.1.
177:35:09 Parker: Copy, 3.1.
This is Apollo Control. We're going to continue watching the pressure in the tunnel between the LM and the CSM for a pressure rise. The pressure has not dropped as we would expect and this implies that perhaps there is some leakage into the tunnel. Since the LM cabin appears to be stable, we suspect that if there is leakage, it would be coming from the Command Module side. If this is the case, the thing we would suspect is some bit of contamination in the CSM [forward] hatch. We're going to continue to watch the pressure in the tunnel, see what happens, and if necessary, we'll remove the hatch on the CSM side, inspect it for any contamination, reseal it, double check the integrity, and then try to vent the tunnel again. There hasn't been any resolution as to just what effect this will have on the LM jettison. The Flight Dynamics Officer [FIDO] has asked the Flight Director if he wanted to delay LM jettison for 1 revolution and we haven't gotten a decision on that at the present time. So we're standing by and watching, and we'll see how the pressure check goes on the LM tunnel, and if it becomes necessary to remove the hatch, we probably will have to delay jettison for 1 rev.
177:36:35 Parker: 15, we'd like to pull the B/D Roll jets.
177:36:35 Irwin: Roger. B/D Roll jets coming off. [Long pause.]
177:37:44 Parker: And, 15, if one of you has a chance, would you put X-ray to Standby, please? [Pause.]
177:40:40 Parker: 15, Houston. [Can] you give us a reading now on that? [Pause.]
177:40:49 Scott: Okay, Houston; stand by one. [Pause.]
177:41:00 Scott: It's just a little under 3.1, just a - just a hairline.
177:41:07 Parker: Roger; copy. And we're still looking at the possibility of opening the hatch. We're just trying to - right now, trying to understand the situation before we open the hatch and destroy the configuration we're in.
177:41:23 Scott: Okay, we'll stand by.
This is Apollo Control. Flight Director Glynn Lunney has just advised the Flight Dynamics Officer [FIDO] to be prepared to go either way with the LM jettison. We're holding the option open to jettison this revolution if we get the situation with the CSM tunnel cleared up. However, it begins to look more and more likely that we will be jettisoning the next revolution which would be two hours from the Flight Plan time, and would move the subsequent activities with respect to the Lunar Module; the deorbit burn and the impact also two hours later. Again the situation here is that we're holding the option open to go either way on that, it does appear at this point more likely that we will be delaying the LM jettison for one revolution, 2 hours and this would delay the subsequent activities with the LM, the deorbit burn and the impact by a like amount, 2 hours.
177:46:38 Parker: And, 15; Houston. Could we have another reading in 10 minutes? [Pause.]
177:46:48 Scott: Well, it's reading right now just about the same that it was when I last called you.
177:46:54 Parker: Roger; copy. There's certainly enough uneasiness down here that we think we ought to proceed back through and open both the Command Module hatch and the LM hatch, check the seals on both and the relief valves on both, proceed back through that, doing - doing those checks, because there could be a very slight leak from the LM that the telemeter guys would not see at - for this small volume in the tunnel. Over.
177:47:27 Scott: Rog. We sort of think that's a good idea, too. We'll proceed.
177:47:31 Parker: Roger. Keep us posted when convenient.
177:47:36 Scott: Roger. Will do. [Long pause.]
Flight Director Glynn Lunney has just made the decision that we will delay the jettison one revolution and consequently the subsequent Flight Plan relating to the Lunar Module will also slip by one revolution.
177:47:55 Parker: 15, just in case you haven't got the idea, when I said check the seals, I mean clean them too.
177:48:03 Scott: Rog. Understand. We'll make sure they're good and clean.
This is Apollo Control. One of the problems in diagnosing the pressure rise in the tunnel is that the tunnel volume is very small with respect to the volumes of the cabin in either the LM or the Command Module, which makes it very difficult to detect the amount of a pressure loss in either of those vehicles that would account for the pressure rises we're seeing in the tunnel. The amount of oxygen lost would be on the order of 1/100th of a pound and this is really below - as they say, below the noise level, almost undetectable. So that's one of the reasons - the principle reason that we are asking the crew to remove and inspect both the hatches from the LM side and from the CSM side since this is such a difficult problem to diagnose and we don't want to get sealed up and then find that the problem was in the LM hatch all along, so we will have them check the seals on both hatches and seal up the tunnel again and again try to vent and see if we can get a proper vent indicating that we have good tight seals on both hatches. The one revolution delay in the jettison will as we said, slip the events related to the LM impact by about 2 hours. This is an approximation and we'll have to wait for the Flight Dynamics Officer to come up with new event times. The orbital period at the present time is 1 hour, 58 minutes, 28 seconds and, for preliminary planning purposes, this would be a good number to use in computing what the slip will amount to in total time; that's 1 hour, 58 minutes, 28 seconds orbital period. Again, though, this - the precise times will have to be computed by the Flight Dynamics Officer.
178:01:37 Worden: Okay, Houston; we're about 2.2 [psi]. [Pause.]
178:01:46 Parker: Copy. [Long pause.]
178:01:58 Worden: And, Houston, do you want to go to 3 [psi] and let it stabilize there?
178:02:03 Parker: I guess we'll do it per the checklist which is 3.5, right? [Pause.]
178:02:16 Scott: Well, not really. Our checklist says before jettison only, LM Tunnel Vent valve, LM Tunnel Vent at least 10 minutes, period. [Pause.]
178:02:27 Parker: Okay. Stand by. [Pause.]
178:02:39 Scott: 'Course, that's after the hatch integrity check. If we want to go ahead and run through the full hatch integrity check, then we'd run up to 3.5 and then run another 10 minutes, I guess.
178:02:48 Parker: Yeah, that's the point, Dave. We want to run a complete hatch integrity check; in fact, we'll proba - we may ask you to run it longer than usual.
178:02:59 Scott: Okay.
178:03:02 Parker: Obviously, what we're thinking about here is a bad hatch seal, so we're particularly interested in that.
178:03:09 Scott: Rog. [Long pause.]
178:04:09 Parker: And, 15, a reminder. When you're on the back side, the LM is still in 5 degree deadband, so play it cool with the Command Module. [Pause.]
178:04:22 Scott: Rog.
178:05:58 Parker: And, 15, what we'd like to see you do is leave that tunnel at 3.5 for the entire back side pass, and we'll see what happens to that leak rate. That gives us a nice, long leak check on the hatch. And, we'll be satisfied with that Delta-P for Jett[ison], if that's the way it works out on the other side. [Pause.]
178:06:21 Scott: Okay. And, I guess in that case, we'll probably break the suits down and then run another suit check before we see you around the corner. So...
178:06:34 Parker: Okay, we'll buy that.
178:06:39 Scott: It's about time for dinner.
178:06:41 Parker: I knew there was a reason.
178:06:46 Scott: Rog. [Pause.] Okay, we're about 3.2 [psi] now on the Delta-P. We'll leave LM [meaning tunnel] in Vent.
178:07:03 Parker: Rog. I understand; 3.2 and still venting.
178:07:08 Scott: Rog. [Long pause.]
178:07:54 Parker: Dave, stand by on taking your suits off; if you haven't taken them off already.
178:08:01 Scott: Oh, we hadn't planned to take our suits off; we were just going to break off the helmets and gloves so we could get something to eat.
178:08:11 Parker: Roger. But stand by on breaking the suits down; because it's a debate as to whether we want to do another suit integrity check.
178:08:19 Scott: Okay.
178:09:24 Parker: 15, press on. You may - you are permitted to break the suits down, but do not do the suit integrity check until you come back around the other side; we can take another look at that tunnel. Over.
178:09:38 Scott: Roger; understand. We'll break them down and hold off until we see you on the other side.
178:09:43 Parker: Okay, good luck.
This is Apollo Control at 178 hours, 11 minutes. We've had Loss Of Signal now with the Command Module, with the LM still in tow. And to resummarize the situation on that last revolution front-side pass: As the spacecraft came into acquisition at the start of this revolution, they were preparing to jettison the Lunar Module on the scheduled time in the Flight Plan. However, one of the checks that we run is a pressure integrity check on the tunnel in the Command Module - the tunnel used by the crewmen to pass from one vehicle to the other - which has hatches at both ends sealing the LM from the CSM. And this tunnel, which is vented down, which in turn produces a pressure differential across the CSM hatch, is checked by seeing how well it maintains this difference in pressure. If the pressure difference changes, it indicates that there's some leakage into the tunnel area. And we saw this sort of a pressure change - a rise in pressure in the tunnel which indicated that either there was a leak across the LM hatch or across the CSM hatch into the tunnel.
In order to assure that on jettisoning the LM, we had a good tight seal on the CSM hatch, the crew was instructed to open the tunnel up and remove the probe and drogue assembly and check the seals on both the LM and the CSM hatches. They did this, and Dave Scott reported, at 177 hours, 56 minutes, that the hatches had been checked; they were clean, resealed and ready to proceed. By this time, we had gone beyond the point which we could jettison the LM as per the Flight Plan. Flight Director Glynn Lunney decided to delay the LM jettison and subsequent activities with the LM for one revolution. After getting the hatches back in place and resealed, the crew will be going through the depressurization of the LM - the tunnel venting procedure again. They're going to let the tunnel depressurize until there is a 3½-pound [per square inch] differential in the tunnel compared with the pressure in the CSM cabin. And then they will watch this pressure and we'll read it when they come back around on the front-side again at the start of the next revolution and see how well the tunnel has held the pressure differential. If we have a good tight seal, at that point we will proceed with the jettison.
The conversation with the crew, just prior to Loss Of Signal, about removing the suits centered around concern here in the Control Center that nothing be done to change the pressure in the Command Module cabin. In removing the suits, there would be nothing that would change the pressure, however, in running a suit integrity check, where the suits are pumped up and then the pressure bleeds off slowly, we do get a change in the cabin pressure. It was decided that there would be no problem in allowing the crew to remove their helmets and gloves so that they could get something to eat on this backside pass. They will then put their helmets and gloves back on, but will not run the pressure integrity check until after we've had a chance to look at the pressure in the LM tunnel. Once the tunnel has been verified, then they'll again run a pressure integrity check on the suits before jettisoning the Lunar Module. At 178 hours, 15 minutes; this is Apollo Control, Houston.
This is Apollo Control at 178 hours, 53 minutes and we are about 3 minutes away now from reacquiring Apollo 15 on its 52nd revolution of the Moon. The Command Module and Lunar Module are still docked at present time. We've delayed the jettison for one revolution because of an unexplained rise in the pressure in the tunnel which is used by the crewmen to pass from one vehicle to another, and which at jettison would have hatches both on the LM side and on the CSM side sealing it off. During this backside pass, while we were out of radio contact with the spacecraft, Flight Director Glynn Lunney reviewed the situation with his flight controllers and on reacquiring we'll be looking to see that the pressure difference in the tunnel has maintained an acceptable level while the spacecraft was on the backside of the Moon. The crew, just before we lost radio contact with them on the last revolution, had vented the tunnel down so that it had a pressure differential of 3½ pounds, in other words the pressure in the tunnel was 3½ pounds lower than the pressure in the Command Module and if we have a good seal on the tunnel, if we have no leakage across the LM hatch or the CSM hatch, the pressure in the tunnel should be fairly close to this number. The environmental systems engineer, the EECOM, has some acceptable leak rates which he will be looking for and will determine if the leak rate across the hatches, either of the hatches is more than acceptable. The previous time on the last revolution when the crew performed this pressure integrity check on the tunnel, part of the operation was done while we were out of radio contact with the spacecraft and on reacquiring, the pressure difference, the change in the tunnel pressure, was not one that was necessarily unacceptable except that we had not been able to see how it had occurred, and there was some concern that it might have been a rapid change in pressure rather than a slow change. A slow change, if it had been consistent, could have been perfectly acceptable, but since there was an element of uncertainty and we could not be absolutely certain that we had good hatch seals, we instructed the crew to pull the hatches, both in the LM and CSM and check them. We just had a call to the crew, we'll stand by for their response.
178:56:04 Parker: Apollo 15, Houston. Over. [No answer.]
178:56:26 Parker: Apollo 15, Houston. [No answer.]
178:56:50 Parker: Apollo 15, Houston. Over. [No answer.]
178:57:14 Parker: Apollo 15, Houston. Over. [No answer.]
Our network controller reports that we may have a ground problem, which is why we're not getting a response from the crew to our calls, and he's checking that, at the present time, to see if we do have a problem at one of our ground - ground stations.
178:58:13 Parker: Apollo 15, Houston. Over. [No answer.]
We do have telemetry data from the spacecraft but we' re not getting voice communications, apparently because of a problem on the ground.
178:58:36 Comm tech: Goddard Voice, Houston Comm tech. Net 1.
178:58:41 Comm tech: Goddard Voice, you're loud and clear.
178:58:43 Comm tech: Roger.
178:58:51 Parker: Apollo 15, Houston, Reacq and Narrow. Over. [No answer.]
Our telemetry data shows that the pressure in both the LM and the Command Module cabins is normal.
178:59:49 Parker: Apollo 15, Houston. Over. [Pause.]
178:59:56 Scott: Houston, Apollo 15. Go ahead.
178:59:59 Parker: Roger. Do you - Roger. Do you have any good word for us?
179:00:05 Scott: I'd say LM/CM Delta-P is off-scale high. [Pause.]
179:00:13 Parker: Roger. And how'd the hatch integrity check go? [Long pause.]
179:00:28 Scott: Well, we've just had it in tunnel vent all the - the way around the back side as I think you suggested. [Long pause.]
179:00:53 Parker: 15, did you have a look at holding it in Delta-P to see how the - see how it was holding on there?
179:01:01 Scott: No, we just left it in Tunnel Vent all the way around the back side. I - That's what we'd thought you'd said to do. We can check it now. [Long pause.]
179:01:21 Parker: 15, why don't you bring it up to 3.5, and let us watch it for a while. I think we garbled some - and you watch it. I think we garbled something there.
179:01:33 Scott: Okay. Our understanding was to let it go all the way, and then you get a good look out on this side. So we'll bring it up to 3.5.
179:03:58 Parker: 15, Houston. Two items; one, we want to make sure that you're aware that we cannot read the tunnel pressure, and so we're depending upon your readouts of this Delta-P to give us the confidence here in the hatch integrity. One other item that we do know, is that during all that period when the tunnel was vented, our O2 flow was off-scale low, which does give us some confidence in the integrity of the hatch. And, meanwhile, we're waiting for your call on a 3.5 reading so we can begin a hatch integrity check. Over. [Pause.]
179:04:36 Scott: Roger.
179:04:38 Scott: Mark. Two minutes and 3.5 plus or minus 0.
179:04:44 Parker: Roger. Copy.
179:04:50 Scott: And - and I think we have the same confidence, Bob. We noticed the low O2 flow also. The only question we had was, why did the Delta-P change? [Pause.]
179:05:03 Parker: That's the same question that was bothering us.
179:05:09 Scott: But, it's steady at 3.5, and has been now for about 2 and a half minutes.
179:05:15 Parker: Copy. [Long pause.]
179:05:43 Parker: Okay, 15. This is Houston. We'd like to run that hatch integrity check to about 5 minutes total, because of what we suspect was the problem before. And, if it passes at that point, we'll press on, per the Flight Plan, for following the normal steps. And you can plan, if we have time for it, we're looking for a jett[ison of the LM] at 179:30, at the present time. Over.
179:06:12 Scott: Roger. 179:30, and we'll give you a call at the 5-minute point.
179:06:17 Parker: Thank you.
At the present time, the crew has vented the tunnel to a pressure differential of 3½ pounds, and then resealed it. And we're going to continue looking at it for a total of about 5 minutes to see if it continues to hold its pressure - to hold the pressure differential. Scott reported after the first 2, 2½ minutes that it was holding well and we'll continue to look at it for another minute or so before deciding with certainty that we have a good hatch seal.
179:07:38 Scott: Okay, Houston. There's 5 minutes at 3.5 and it looks solid.
179:07:43 Parker: Roger, Dave. Let's press on with a nominal timeline.
179:07:49 Scott: Roger. [Long pause.]
179:08:16 Scott: And, Houston. Are you happy with 3.5 or would you like to bleed it down a little more?
179:08:20 Parker: Roger, Dave. We're happy with the hatch integrity, and let's open the tunnel vent and bleed down towards 4.0 at - for the nominal setup. And I guess it's on the decal there.
179:08:31 Scott: Rog. No, the decal says go for 10 minutes in LM tunnel vent.
179:08:41 Parker: Roger. And I guess that means after hatch integrity, which means beginning now.
179:08:53 Scott: Rog. Step 7, and it's in work.
With that test, we're satisfied that we do have a good seal on the hatch and we're going to proceed now with jettison and separation. The LM jettison is scheduled to occur at 179 hours, 30 minutes, and the separation maneuver by the Command Module will be at 179:35, or 5 minutes after the jettison.
179:21:40 Scott: Okay, Houston; 15. We got a good pressure integrity check. We're ready to press on.
179:21:46 Parker: Roger, we agree. [Long pause.]
179:22:32 Parker: And, 15, we're still aiming for 179:30 for Jett[ison]. And be advised, of course, this means we're going to have to retarget P30 to 179:35. And, other than that, all attitudes will be the same. Although, of course, since you'll be local vertical, your inertial attitudes for the burn will be slightly different than what you've seen. [Pause.]
179:22:59 Scott: Okay. Understand. And your Delta-P is off-scale high now.
179:23:04 Parker: Roger. And you're 14 minutes past that time [that they began venting the tunnel for the last time]. [Long pause.]
179:23:44 Worden: Houston, 15.
179:23:45 Parker: Go. - Go ahead, 15.
179:23:54 Worden: Roger. Understand. The retargeting on P30 - you want to target that for 179 plus 30 plus 00, and the same Delta-Vs as before?
179:24:05 Parker: Negative, Al. It's going to be 179 plus 35 plus 00 for the Sep burn.
179:24:16 Worden: Sorry about that. I meant 179 plus 35. Three zeros Jett, huh?
179:24:21 Parker: That's affirm. [Long pause.]
179:24:53 Worden: Houston, 15.
179:24:54 Parker: Go. [Pause.] 15, go ahead.
179:25:05 Worden: Roger. We're ready to turn the sequence arm on [to re-arm the tunnel pyrotechnics].
179:25:08 Parker: Roger. You're Go for turning them on.
179:25:05 Worden: Okay, and Logic 1, On; Logic 2, On. [Pause.]
179:25:26 Parker: And, 15, you're Go for Pyro Arm.
179:25:32 Worden: Roger. [Long pause.]
179:25:57 Parker: And, 15, we need Direct RCS, On, please. [Pause.]
179:26:09 Worden: Okay. Directs are on. [Long pause.]
179:27:04 Parker: And, 15, 3 minutes to Jett[ison], and we're wait - we're watching for Pyro Arm.
179:27:13 Scott: Okay. We're proceeding through the pre-Jett checklist at this time, and we'll get right to you.
This is Apollo Control. We're now about 2½ minutes away from the scheduled time for jettisoning the LM. At the time of jettison, the spacecraft will be in an attitude with the Service Module SPS engine pointed towards the Moon and the LM jettison will occur with the LM jettisoning away from the lunar surface. Following the jettison, the Command Module will perform a small retrograde separation maneuver to assure that there's no chance of recontacting the Lunar Module, and with separation coming at 179:30, the deorbit burn, the burn to impact the Lunar Module into the lunar surface, will occur at 181 hours, 4 minutes, 19 seconds; and we predict impact would be at 181 hours, 29 minutes, 23 seconds.
Coming up now on 15 seconds to LM jettison.
And we confirm jettison.
179:30:17 Scott: And, it's away clean, Houston.
179:30:19 Parker: Roger, copy. Hope you let her go gently. She was a nice one.
179:30:25 Scott: Oh, she was at that.
Diagram of LM jettison configuration.
179:32:15 Scott: Houston, 15. Question on the separation maneuver. Do you want us to burn the residuals in P41, or just make 1 foot per second burn?
179:32:27 Parker: Roger, Terry. Burn them in P41, please.
179:32:32 Scott: Rog.
179:32:36 Parker: You understand that's burn the residuals, right?
179:32:38 Worden: Just - just making - just making sure. [Long pause.]
This separation maneuver will be performed using the attitude control thrusters, the RCS system, and will be 1 foot per second [0.3 m/s] velocity change.
179:33:29 Scott: And forward takes us right back to the LM. [Pause.]
179:33:42 Parker: Stand by, Dave. We're looking into that, of course.
179:33:48 Scott: Okay. We got about a minute and 15 seconds or so.
179:33:53 Parker: Roger. [Long pause.]
179:34:34 Scott: Average g is On [i.e. the computer is about to begin the burn and has begun measuring acceleration]. [Long pause.]
179:34:50 Parker:Ah, hold the burn, Dave.
179:34:54 Scott: Okay, we'll hold the burn.
179:36:26 Parker: 15, this is Houston. We'd like to have visual reference relative to your position to the LM. We'd like you behind the LM. And, we'll give you a burn attitude for 5 minutes from now. [Pause.]
179:36:42 Scott: Roger. [Pause.] Okay, I guess she's 150 feet [45 metres] dead ahead.
179:36:53 Parker: Okay. Copy, Dave. Thanks.
Spacecraft Communicator Bob Parker double checked the attitude - or the position of the Lunar Module relative to the Command Module. And while we were getting that double check, we delayed the separation maneuver for 5 minutes. And we're, at this point, waiting for the Flight Dynamics Officer to recompute the burn attitude. And we'll be performing that separation maneuver in about 3 to 4 minutes from now.
179:38:14 Parker: And, Dave. Can you verify, were you behind, in local vertical, or body attitude coordinates?
179:38:24 Scott: Well, give us a little while to figure that one out.
179:38:26 Parker: Roger. Are you behind it in the orbit, or are you just - is it just sitting there in front of you as you sit there and look at it?
179:38:34 Scott: It's sitting in front of us when we sit there and look at it.
179:38:41 Worden: Bob, we're almost directly radially inward from the LM right now.
179:38:47 Parker: Copy that. [Long pause.]
179:39:25 Scott: Houston, our attitude is 150 degrees relative to the local horizontal.
179:39:33 Parker: Say that again, please, Dave.
179:39:37 Scott: Rog. Our attitude, according to Verb 83 down there, is 150 degrees, relative to the local horizontal. Which means we're, I guess, fairly close to local horizontal, at least within 30 degrees. [Long pause.]
179:40:28 Parker: Stand by, guys. Confusion still reigns, I think.
179:43:22 Parker: 15, do you have an ORDEAL ball going at the moment?
179:43:27 Scott: Sure do, and it's on the DSKY; you can see it right down there.
179:43:30 Parker: Thank you. [Long pause.]
179:44:04 Parker:Roger, Dave. We would like you to do a VFR burn, which means go - maneuver to a trailing position - and fire one foot per second retrograde. Understand?
179:44:16 Scott: That sounds like a good burn. Rog. We'll do that. [Long pause.]
This is Apollo Control. The separation maneuver which...
179:45:19 Scott: Houston, 15. This ought to make for some interesting discussion, but I guess what you want us to do is point at him and burn aft to one foot per second; is that correct?
179:45:28 Parker: Roger, Dave. That's probably the best way to keep an eye on him.
179:45:34 Scott: Well, we're having a tough time doing that, because he's right in the Sun right now. [Long pause.]
179:45:54 Scott: But, Houston, I think at this attitude, a one foot per second aft will give us sufficient clearance. Don't you? [Pause.]
179:46:06 Parker: As long as you're trailing him, Dave. I guess, right now, we can't give you any sound advice down here.
179:46:14 Scott: Okay, well, if we burn one foot per second on the local horizontal, which we are almost on right now, I think that will put us in a orbit which re - remains clear of it. [Long pause.]
179:47:01 Scott: Okay, Houston. As far as trailing goes, right now as we look over the ground, we're leading him.
Diagram of CSM/LM orbital configuration at separation maneuver.
179:47:06 Parker: Roger. That's our...
179:47:07 Scott: We're about on a horizontal in front of him.
179:47:10 Parker: Roger. We need you behind him, Dave. That - we were gradually coming to that conclusion. That was the only way you could have him in the Sun. We need you behind him and then a firing of retrograde. [Pause.]
179:47:26 Scott: Yeah, that's going to take an awful lot. Because we're a fair ways out now, and we'll have to maneuver quite a ways to get behind him, and it'll take quite a while and a little bit of gas.
179:47:37 Parker: Roger, Dave. Understand that. Stand by. [Long pause.]
179:48:07 Parker: Okay, Dave. How about 2 foot per second posigrade, as long as you're in front of him. Understand? 2 foot per second posigrade. [Long pause.]
179:48:32 Scott: Okay; so that'll be a minus-X Delta-V for 2 feet per second at out present attitude, right? [Long pause.]
179:48:49 Parker: Rog. That affirm, Dave.
179:48:53 Scott: Okay. We're all in the same frequency. We'll do that.
We show the separation maneuver in progress at this time.
179:50:02 Worden: Okay, Houston. We put in 2 feet per second aft. And that was done just at local horizontal.
The timing of the separation maneuver is not critical and won't affect the events with the Lunar Module; the deorbit burn and the subsequent impact of the Lunar Module. We took some additional time to assure that the crew aboard the Command Module had good visibility of the Lunar Module at the time they performed the separation. And they completed the maneuver using the attitude control thrusters, changing their velocity [by] 2 feet per second to assure they got adequate separation from the Lunar Module.
179:50:45 Parker: And, 15; if you can anticipate, why don't you give me a call when you get yourself partially powered down from this. Then we'll read you some Flight Plan updates, which are mostly just the deletion of activities so you can get to bed.
179:51:03 Scott: Okay, Houston. Appreciate that. Thank you, and we'll call you back.
And CapCom has just advised Dave Scott that we're going to proceed on with the power down as soon as possible to allow the crew to get some much needed rest.
179:55:32 Parker: 15, Houston. You got a moment for this update?
179:55:38 Scott: Just a minute, Bob. [Long pause.]
179:56:06 Irwin: Okay, Bob. What changes do you have for us.
179:56:07 Parker: Okay. These will start out in the Flight Plan here. And, after LM Jett, we'd like you to proceed with the activities that run on the original Flight Plan from 177:30 through 178:01. So that last entry that we will be doing will be the line that says "X-ray, On" at the very top of that next page.
Parker (continued): After that - during that, though, we will delete at 177:53, the line that says "Mapping Camera/Laser Experiment Covers, Open, talkback, barber pole, then, Off, center." It's the second line in the block at the bottom. You got that?
179:56:56 Irwin: Okay, understand. We'll delete that particular line, "Mapping Camera/Laser Experiment, Off," and we'll do all the activities up to - through 178 there, the Mass Spec. X-ray, On.
179:57:11 Parker: Roger. And at the - on that same page, beginning at 178:20 to 178:30, we will scratch that particular - that whole block of items. And going along with that, at 178:39, it says "DAC, On;" we'll also scratch that. Over. [Pause.]
179:57:11 Irwin: Roger. Understand. We'll scratch the activities from 178:20 to 178:30. And, at 178:39, we'll scratch "DAC, On." How about the activity there at 18:31 [means 178:31]? We - guess we'll do that, huh?
179:57:58 Parker: Roger. At 178:31, that "Mass Spec., Multiplier, Low, Discriminator, High: Ion Source, On" will be done 30 minutes - three zero minutes after the Mass Spec. Experiment, On; Ion Source to Standby, which is over there at 178:01. [In] other words, we need a 30-minute delay between the top item on the left-hand column and the top item on the right-hand column.
179:58:27 Irwin: Okay, we understand.
179:58:29 Parker: Okay, we'll delete the Pan Camera activities over on 179 hours. There's one at a hundred [pause] 15, if you read, there's one item at 179:16, and another item at 179:21 that pertain to the Pan Camera. We will delete both of those. [Pause.]
179:59:02 Irwin: Okay, understand. Delete the Pan Camera action at 179:18 and 179:21.
179:59:11 Parker: Roger. Copy. And when your ready to sleep, I guess you can start with the Systems Checklist - pre-sleep checklist at 179:31, there.
179:59:22 Irwin: Okay, thank you, Bob.
179:59:24 Parker: And you'll noticed we didn't delete the eat period. [Pause.]
179:59:32 Irwin: Thank you.
179:59:34 Parker: And - and, Jim; do you guys want a TEI-58 PAD? [Long pause.]
179:59:52 Irwin: Okay. We'll take one.
179:59:54 Parker: Okay. If you got - have you got the [writing] pad out?
179:59:59 Irwin: No, stand by.
180:00:00 Parker: Give me a call.
180:00:05 Irwin: Okay.
180:00:08 Parker: Okay, Jim. Understand you have the [writing] pad. SPS/G&N; 36363; plus 0.61, plus 0.93; 192:13:33.30; plus 2799.7, plus 0609.5, minus 0098.0; 181, 112, 015. Rest of the PAD [is] NA. Ullage: 4 jet, 12 seconds. Over. [Pause.]
180:01:08 Irwin: Understand. It's a TEI-84 SPS/G&N; 36363; plus 0.61, plus 0.93; 192:13:33.30; plus 2799.7, plus 0609.5, minus 0098.0; 181, 112, 015; 4 jet for 12 seconds.
180:01:34 Parker: Roger, Jim. Except it's TEI-58.
180:01:41 Irwin: Roger. It's 58. [Pause.]
180:01:47 Slayton:Okay, Jim. And, while we got you, - this is Deke. I'd like to have you and Dave, at least, take a Seconal here before you go to sleep so you can really power down for the night. You guys need it. It's up to Al whether he wants one or not.
180:02:04 Irwin: Okay, thank you, Deke.
180:02:06 Slayton: Roger.
180:03:37 Parker: 15, Houston. We have a correction to that update, if you'd get the Flight Plan back out please.
180:03:47 Irwin: Okay, go ahead.
180:03:48 Parker: Roger. That item 178:30, on the Mass Spec., the discriminator value there should be Low. Copy? [Pause.]
180:07:35 Slayton: Apollo 15, Houston. You're about one minute until LOS. Sleep tight.
180:07:44 Worden: Right, Deke. Goodnight.
This is Apollo Control. We've had Loss Of Signal now. Again to go back over and sort out some of the activities on that revolution. We successfully completed the LM jettison and that occurred at 179:30, after reverifying that the tunnel was maintaining the proper delta pressure - pressure differential, and that we had a good tight Command Module hatch seal. We had planned to do the separation maneuver performed in the Command Module using the Reaction Control System thrusters at 179 hours, 35 minutes; and just before the maneuver was to be performed, Dave Scott gave us a call indicating that he wasn't quite sure that the attitude we had given would be in the proper direction to avoid recontact. At that point Flight Director Glynn Lunney told the CapCom to call off the burn while we sorted everything out, made sure that there was no confusion and after reviewing the position of the Lunar Module, double checking that with the crew - the relative position of the LM with respect to the Command Module - and providing them an attitude which could be a burn giving them, at the same time, a view of the LM and keeping the Sun out of their eyes, we performed the maneuver about 10 minutes late to about 14 minutes late at 179 hours, 49 minutes. The timing on this burn is not critical for separation, thus there is no concern about delaying it to make sure that everyone agreed that we were in the proper attitude and that the maneuver was in such a way that the crew would be able to see the LM and also to keep the Sun out their line of sight.
The LM impact is scheduled now to occur at 181 hours, 29 minutes, 23 seconds; and this will be about 25 minutes after the deorbit burn which will be performed on command from the ground at 181 hours, 4 minutes, 19 seconds. The one revolution delay in performing the jettison will affect, of course, the LM impact time. This time that we've just given you is approximately one revolution later than the Flight Plan time. However, by the time we've completed the sleep period tonight and back in activities tomorrow, we should - we would expect to see no change to the Flight Plan for such events as Trans-Earth Injection and subsatellite deploy and this sort of thing. We would expect that the delay in performing the jettison tonight would have no effect on these downstream Flight Plan activities. The principal concern at the present time is to get Jim Irwin and Dave Scott to bed at the end of a very long day. The Flight Activities Officer [FAO] reported that he felt they could probably begin their sleep period, in fact may already be asleep by the time we reacquire the spacecraft on its next frontside pass. Virtually all of the activities requiring their assistance have been completed. The other activities aboard the Command Module can easily be handled by Al Worden, and Dave Scott mentioned that they were going to be getting a bite to eat and we would hope that they would either have begun their sleep period by the time we reacquire or will begin the rest period shortly after we reacquire on the 53rd revolution. At 180 hours, 13 minutes; this is Apollo Control, Houston.
This is Apollo Control at 180 hours, 52 minutes. And we're now 2 minutes from reacquiring the spacecraft. We would hope that Jim Irwin and Dave Scott either have begun their rest period, or will shortly after we reacquire the spacecraft. And on this revolution, the major activities will be the Lunar Module deorbit burn and LM impact. The deorbit burn is scheduled to occur at 181 hours, 4 minutes, 19 seconds; with impact on the lunar surface occurring about 25 minutes later at 181 hours, 29 minutes, 23 seconds. The impact coordinates are 26.12 degrees north and 1.06 degrees east. Let's correct that to say 26 degrees, 12 minutes north, and 1 degree, 6 minutes east, rather than hundredths of degrees. So that would be 26 degrees, 12 minutes north, 1 degree, 6 minutes east; impact coordinates for the Lunar Module ascent stage.
The LM, at the present time, is in an orbit 64.3 nautical miles by 52.2 [119.1 by 96.7 km]. And at the time the deorbit burn is performed, we estimate that the Command Module will be 8 [nautical] miles [15 km] behind and about 2¼ miles [4.2 km] above the LM. We should have Acquisition Of Signal from the Command Module in about 1 or 2 seconds. And our network controller, INCO, report that we have Acquisition Of Signal.
The INCO reports that the radio contact we have is with the Lunar Module. We're still waiting to get radio lock on with the Command Module in its 53rd revolution of the Moon now. The Guidance Officer [GUIDO], just a minute or so ago, radioed the command to the LM guidance system which starts the proper computer program in process and will end with the deorbit burn, which will occur about 8 minutes, 50 seconds from now - or correction - 6 minutes, 12 seconds from now at 181 hours, 4 minutes and 19 seconds.
180:58:39 Parker: Apollo 15, this is Houston. Standing by in the blind. [No answer.]
INCO says we do have radio signals now from the Command Module.
181:01:15 Parker: Apollo 15, this is Houston. Standing by in the blind. Over. [No answer.]
181:02:59 Parker: Apollo 15, Houston. Calling in the blind and standing by. Over. [No answer.]
181:03:47 Parker: Apollo 15, Houston. Calling in the blind. Standing by. Over. [No answer.]
We're coming up now on 20 seconds until the beginning of the LM deorbit burn. It will be a 201-foot-per-second [61.3 m/s] burn, using the four Reaction Control System thrusters on the LM ascent stage.
Our LM Guidance and Control Officers both report telemetry data indicates the LM is burning. And we should have impact at 181 hours, 29 minutes, 23 seconds. We do have lock on with the Command Module, However, the signal strength is not strong enough at the present time for us to hear any response from the crew. Apparently they're not in the attitude with the High Gain Antenna yet to give us a good - good enough signal strength for voice communications. The Guidance Officer says that the burn is progressing normally with the LM ascent stage. And again those predicted impact coordinates are 26 degrees, 12 minutes north, 1 degree, 6 minutes east.
The Guidance Officer says we've had shutdown now. And the LM guidance system appears to have shut the burn off right on time. Guidance says the residual was .08 [fps, 2.4 cm/s], which indicates that the burn was almost precisely as planned. And at the conclusion of that burn, the ascent stage has a weight of 5,315 pounds [2,411 kg]. Currently the altitude is 61.4 nautical miles [113.7 km] and we'll be able to watch that altitude as it drops off to nothing at impact.
181:08:14 Parker: Apollo 15, Houston, in the blind. Over. [No answer.]
181:10:14 Parker: Apollo 15, Houston, in the blind. Over. [No answer.]
Falcon's altitude at the present time is 53.1 nautical miles [98.3 km] and at impact the LM ascent stage will have a velocity of 5,560 feet per second [1,695 m/s]. The flight path angle will be minus 3.2 degrees, or 3.2 degrees pitched down from horizontal; very shallow angle of impact. We're now about 17 minutes, 50 seconds away from LM impact.
INCO reports that signal strength is coming up on the CSM antenna indicating that we're getting the antenna - the High Gain Antenna around into position where we should be able to get voice communications with the crew aboard Endeavour.
181:15:56 Worden: Okay, we're just about getting bedded down here, Bob. I wanted to check and clarify one thing with you before we did.
181:16:04 Parker: Please do.
181:16:09 Worden: Okay, the Flight Plan updates that you gave to Jim a little while - earlier included Mass Spec. Experiment, On, and some switching with the discriminator and multiplier. Now, as of yesterday, we had decided not to use the Mass Spec. because of the boom deploy problems. Has somebody decided that we now should deploy the boom?
181:16:32 Parker: Rog. My understanding is that we didn't want to do it before the plane change because we might have to jettison it and it's - now that we've got the plane change accomplished, we'll run it. And, if you have to jettison before TEI, we'll do that. Over.
181:16:49 Worden: Okay, I understand. I guess I didn't understand that yesterday; and, we'll go ahead and deploy it and get the Mass - Mass Spec. going now.
181:16:56 Parker: Roger, Al. And one more thing; we'd like to make sure tonight that Jim is on the EKG for the evening.
181:17:08 Worden: That's affirm. Jim will stay on biomed tonight.
181:17:15 Parker: Rog. And, one more thing, Al, we would like to verify High Gain Antenna angles as pitch 25, yaw 185.
181:17:26 Worden: Right. That's what they're set on now, Bob.
181:17:28 Parker: Okay. We had a long while picking you up. I guess we were a little worried, there.
181:17:35 Worden: No, we just got our signals crossed in here. And, we had some different numbers on them before. So I got them. We're fixed up now.
181:17:41 Parker: Okay, and we'll be expecting you to be in VHF bistatic later on, right? [Pause.]
181:17:51 Worden: I guess. Do you want us to go ahead and do that?
181:17:56 Parker: Yes, please, Al.
181:18:02 Worden: Okay. [Long pause.]
181:18:25 Parker: Okay, and one last little check is Optics Power is On. We'd like it Off eventually. I expect you haven't gotten that far yet, Al.
181:18:34 Worden: That affirm. We'll get it.
181:18:35 Parker: Okay, and otherwise you call us; we won't call you.
181:18:42 Worden: Okay, we'll call you. Thank you, Bob. Goodnight.
181:18:44 Parker: Goodnight.
We're coming up now on 10 minutes until LM impact. And we currently show Falcon to be at an altitude of 31.5 nautical miles [58.3 km].
181:20:29 Parker: 15, Houston. Over. [Pause.]
181:20:36 Worden: Famous last words; go ahead.
181:20:37 Parker: Yeah. How's that for broken promises. Hey, OSO [Orbital Science Officer] just came out of the woodwork and was worried because he doesn't have X-ray and Gamma-rays and all those on yet either. I'd assume you probably have - just haven't done any of that block, right?
181:20:51 Worden: Yeah. Hey, Bob, we're still trying to get cleaned up in here and get suits put away and all that sort of stuff. We'll get with it as soon as we can, but it's awfully cramped quarters and an awful lot of stuff to move around.
181:21:02 Parker: Rog. We were afraid you'd get used to the luxury of all that space.
181:21:09 Worden: I kind of liked it here by myself.
181:21:16 Parker: This time I'll keep my promise.
181:21:20 Worden: Okay.
This is Apollo Control. We're nearing 6 minutes away now from LM impact. In the MSC News Center briefing room, Dr. David W. Strangway will be available to provide background information and answer questions on the LM impact and we'll have displays of the seismometer tracings that we're receiving here in Mission Control from the Apollo 15 and Apollo 14 science experiment packages - Passive Seismic Experiments. At the present time we show Falcon to be 17.4 nautical miles [32.2 km] above the lunar surface.
This is Apollo Control. The actual time of LM impact, as computed from the time at which our displays on the LM went static and we lost radio communications from the vehicle, was 181 hours, 29 minutes, 37 seconds.
This is Apollo Control at 182 hours, 7 minutes. We said goodnight to the crew aboard Apollo 15 about 45 minutes ago. At the time, Al Worden reported that they had a good bit of cleaning up to do, and getting things shipshape before they'd be able to actually begin their rest periods. However, we do not plan to call the spacecraft again. If there is any communications, the crew will initiate a call to Mission Control. The Flight Dynamics Officer [FIDO] is continuing to refine the impact time for the LM ascent stage. At the present time our best estimate is that impact occurred 181 hours, 29 minutes and 34 to 36 seconds, and we'll get that impact time more precise as the remote sites have a chance to refine the data and determine precisely when we lost radio contact. We've now had Loss Of Signal with the Command Module Endeavour. Spacecraft on its 53rd revolution and we'll be reacquiring in about 45 minutes as the spacecraft comes back around to the front side of the Moon on its 54th revolution of the Moon. At 182 hours, 8 minutes; this is Apollo Control.
182:07:11 Worden (onboard): Cabin reading about 5.7 over there, Dave?
182:07:22 Irwin (onboard): Okay. I guess we ought to wait until we complete chlorination before we get the...
182:07:33 Worden (onboard): David.
182:07:35 Irwin (onboard): ...the gloves and helmets off.
182:07:47 Worden (onboard): Hello, Houston; this is 15.
182:07:50 Irwin (onboard): Baseband.
182:07:51 Scott (onboard): Yes. Of course.
182:08:57 Irwin (onboard): Mine.
182:09:01 Scott (onboard): Yes, that's yours.
182:09:02 Irwin (onboard): Let me get that.
182:11:52 Worden (onboard): Hey, pretty good.
182:12:23 Worden (onboard): Help me put the other end of this guardrail on here.
182:12:27 Irwin (onboard): MDC guard, Al.
182:12:30 Worden (onboard): So the MDC guard.
182:12:32 Irwin (onboard): Yes.
182:12:33 Scott (onboard): Hope it doesn't get over [garble].
182:12:37 Worden (onboard): Is it in the way? Huh?
182:12:42 Irwin (onboard): Oh, the MDC guard.
182:12:43 Scott (onboard): Did you take that down?
182:13:40 Worden (onboard): Okay.
182:33:59 Scott (onboard): Got it?
182:34:00 Worden (onboard): I got it.
182:34:08 Scott (onboard): Okay, pal.
182:34:12 Worden (onboard): Come here and - get this.
This is Apollo Control. We're now about a minute away from reestablishing radio contact with Apollo 15. The spacecraft now in it's 54th revolution of the Moon. We do not expect to have any communications with the crew. We said goodnight to them at 181 hours, 18 minutes; or about an hour and a half ago. And at that time, Al Worden said they still had a fair amount of cleaning up to do and getting sample containers stowed and the Command Module cabin cleaned up and ready for sleep. We told them that we would not call them. If they had anything for us, that they could give us a call and recommended that they get to sleep as soon as possible. We do have biomedical telemetry on Jim Irwin, and that will probably be our best indication as to whether or not they're sleeping when we reacquire. INCO says we have reestablished radio contact with the spacecraft. And the ALSEP support room here in the Control Center reported that we got seismic signals registered on all three of the active stations - the passive seismometers at Apollo - at the Apollo 12 site, the Apollo 14 site, and the Apollo 15 site from the LM impact. While we're in radio contact with the Command Module, we'll keep the - keep the lines up although we do not expect any voice communications for the duration of the sleep period.
182:55:06 Worden: Houston, 15. [Pause.]
182:55:11 Parker: 15, go ahead.
182:55:16 Worden: Is it time to get up yet, Bob? [Pause.]
182:55:25 Parker: Rog. We've got about 15 updates here for you, if you want to get ready in the SIM bay.
182:55:34 Worden: Thought we'd give you a crew status report and the onboard read-outs before we called it a night. I just wanted to check and make sure we got everything turned on for you. [Pause.]
182:55:48 Parker: Roger. We'll get the guys looking at that...
182:55:50 Worden: We got the Mass Spec. out. Okay, Bob, we got the Mass Spec. out, and I think we've cleaned up everything else for you for tonight, and I'll give you the readings here and then we'll call it a night.
182:56:07 Parker: Rog. We're listening, and I hope everybody else down here will be getting with me so we can give it to you at the end, if anybody wants anything. Go ahead. [Pause.]
182:56:20 Worden: Okay. The PRDs: 25023, 23174, 08029.
182:56:32 Parker: Copy.
182:56:33 Worden: My read-outs: Bat C, 37 [volts]; Bat A, 37.5; Bat B, 37.5. RCS quads are 63, 58, 60, 58.
182:56:50 Parker: Copy.
182:56:54 Worden: And, we are configured for the bistatic radar test. [Pause.]
182:57:02 Parker: Al, that should be bistatic VHF.
182:57:09 Worden: That's correct, Bob. The bistatic VHF radar test. [Pause.]
182:57:25 Worden: And, can you think of anything else that needs to be done?
182:57:29 Parker: Stand by, Al.
182:57:33 Worden: Okay. [Long pause.]
182:57:02 Parker: Okay, three verifies for you, Al. Can you verify the Gamma-ray's out? The X-ray is ready? And we need a verify on Jim for his EKG.
182:58:07 Worden: Okay. He's not hooked up yet but he will be shortly. And we'll verify the Gamma-ray, out and On, and the X-ray, On.
182:58:13 Parker: Thank you. [Pause.]
182:58:21 Parker: And, Al, we're working a state vector uplink for you. Stand by a minute and we'll get a decision on that.
182:58:31 Worden: Okay, Rob. I guess we didn't have a[n indication of the] Gamma-ray [boom going] out, so it's going out now.
182:58:37 Parker: Roger. That's a verify, I guess.
182:58:39 Worden: And the X-ray is On.
182:58:41 Parker: Thank you. [Pause.]
182:58:49 Worden: Okay, the X-ray is On. Seems like we had quite a few loose ends tonight. [Long pause.]
182:59:16 Parker: And, Al, how about a verify on X-ray Covers, Open? [Long pause.]
This is Apollo Control. We hadn't expected to hear from the crew aboard Endeavour on this, the 54th revolution. However, we received a call from Al Worden about 30 minutes ago. Worden passed along a crew status report and mentioned that Jim Irwin was still in the process of getting set up for the sleep period, and hadn't, at that time, hooked up the biomedical sensors that we'll be using to monitor his sleep this evening. We had Worden double check some of the switching configurations for the orbital science experiments, particularly the Gamma-ray and X-ray spectrometer, and also, a bit later, put in another call to Worden to double check the switch settings for the Mass Spectrometer, which we were not receiving data on. And after a double check, Worden found a switch that was out of the proper configuration, switched it on and we are getting Mass Spectrometer data. The crew is about 3 hours late or a little more getting started on their rest period and we plan to let them get a good night's sleep. Gene Kranz, who is the Flight Director coming on duty, has asked his Flight Activities Officer [FAO] to plan for a day of orbital science based on a 10-hour rest period, which would mean that the crew would be awakened at about 193 hours, or perhaps a bit later. The Flight Dynamics Officer [FIDO] has come up with a set of impact coordinates for the Lunar Module, and they are as follows: 26.327 degrees north and 0.267 degrees east. The target coordinates were 26.2 degrees north and 1.1 degrees east. So the principal effect was to put the impact point down range approximately 9/10ths of 1 degree. And the Flight Dynamics Officer is computing an actual miss distance, in terms of kilometers and miles, and we should have that a bit later. The impact was registered on the seismometers of all three ALSEP stations which are on the Moon, the Apollo 12, 14 and 15 stations, and was, as we understand, weakest at the Apollo 12 station. Apollo 15, at the present time, is in an orbit with an apocynthion of 67 nautical miles [124.1 km] and a pericynthion of 52.8 [97.8 km]. We have about 34 minutes of acquisition time left before we lose radio contact with the spacecraft on its 54th revolution. At 183 hours, 31 minutes; this is Apollo Control, Houston.
This is Apollo Control; 183 hours, 51 minutes Ground Elapsed Time. Crew still asleep. 14 minutes remaining until Loss Of Signal with Command Module Endeavour toward the end of the 54th lunar revolution. Handover complete to Gene Kranz's White Team of flight controllers, Black Team headed by Glynn Lunney going off shift. Change of shift press conference with Flight Director Lunney will commence in about five minutes at 12:30 Houston time in the small briefing room in the News Center. We'll leave the line up through the end of this revolution until Loss Of Signal this revolution, in the off chance there might be additional conversation with the crew, but it seems it's highly unlikely. At 183:52, this is Apollo Control.