This is Apollo Control. The Ken Mattingly press conference is scheduled to begin shortly in the MSC news center auditorium. During the press conference, we will tape any conversation with the spacecraft and play that back immediately following the press conference. At 4 hours, 45 minutes, this is Mission Control, Houston.
004:50:49 Haise: Is the S-IVB doing something different now?
004:50:56 Kerwin: Well, I don't know. It should be - let's see, it should have started the LOX dump at least quite a while ago. I guess that's complete. Why do you ask, Fred?
004:51:10 Haise: I'm looking out window 5 at what I think is the S-IVB, and I'm seeing what looks to be double plumes, growing in - it's two very narrow bands, maybe about 3 degrees, that are streaming out from it. And then there is a less dense band that covers maybe a 40-degree swath through the sky that continues out, also, in two directions.
004:51:45 Swigert: Hey, Joe, what it looks like, kind of, is if you pull up behind a guy that's pulling a contrail, and you get in his contrail, like he's going away from you - there's a long contrail.
004:51:55 Kerwin: Okay; stand by. Let me see what Frank's got to say about that.
004:51:59 Haise: Except we're between - Looks like we're between two contrails, one guy above and one below.
004:52:07 Kerwin: Roger. [Pause.]
004:52:14 Haise: It's a very pretty sight. [Long pause.]
004:52:33 Kerwin: Okay, 13; Houston. The booster says that the propulsive dump is concluded; he now has the nonpropulsive vents open and what you see is a normal phenomenon and it should go on for another 5 minutes or so.
004:52:52 Haise: Okay.
004:52:54 Kerwin: And, while I've got you, 13, at your convenience, we'd like to have the results of the EMS bias tests that you did pre-TLI and pre-Sep.
004:53:08 Swigert: Stand by.
004:53:10 Kerwin: Okay. [Long pause.]
004:54:05 Swigert: Okay, Joe. The TLI - the Delta-V no-bias test prior to TLI, we had a 0.8, and post-TLI, it was 1.0.
The Entry Monitor System, or EMS. Original scan via heroicrelics.org
EMS functional flow.
004:54:24 Kerwin: Okay, Jack. Copy that. Thank you very much. Incidentally, as your tracking gets better and better, the size of MCC-2 is getting lower and lower and figures to be somewhere between 10 and 30 feet per second now.
004:54:40 Swigert: Sounds good.
004:54:41 Kerwin: Yeah, sure does. [Long pause.]
004:54:54 Kerwin: Apollo 13, Houston.
004:54:56 Swigert: Go ahead, Joe.
004:54:57 Kerwin: Okay. We have a PTC REFSMMAT ready, if you're ready to go P00 and Accept, we'll stick it in there.
004:55:05 Swigert: Okay. Stand by.
004:55:08 Kerwin: Okay. [Long pause.]
004:55:45 Swigert: Okay. I'm P00 and Accept, Joe.
004:55:48 Kerwin: Okay. Roger that.
This listing from the Guidance System Operations Plan for Apollo 13 shows the structure of the REFSMMAT update. When the Data Uplink is selected, the computer in Mission Control produces the navigational data in the order listed above. It lists the location in the Apollo Guidance Computer memory, its value in the form of six numbers, and each followed by an Enter. The computer update program was designed to emulate the DSKY keyboard, so that for the computer it is irrelevant whether the update is made by an astronaut punching in numbers, or via the radio.
This is Apollo Control, Houston; at 4 hours, 58 minutes. During the press conference, the liquid oxygen propulsive vent from the S-IVB was completed successfully. We also had an exchange with the crew during which Jack Swigert and Fred Haise reported noticing what appeared to be contrails coming from the S-IVB and we advised them that this was a normal occurrence during the propulsive vent from the S-IVB. The plan was to dump the liquid oxygen for a total of 48 seconds or until the tank went dry. As it turned out, the tank did not go dry at the end of 48 seconds and the Instrument Unit, as planned, shut the vent off. Now this meant, then, that we continued to get non-propulsive venting which produced the apparent contrails viewed by the crew. We have a scheduled midcourse correction opportunity for the S-IVB at six hours. It is expected that this midcourse correction will be required and we also have an opportunity at 9 hours for an additional midcourse correction on the S-IVB to assure that it is on a trajectory which will impact the Moon at the desired point. We'll play back for you now, the taped conversations with the crew, and then continue to stand-by for any live communications with the spacecraft.
005:39:51 Lovell: Okay. I just got all hooked up to get in my comm system here, and I just wanted to check out. I've got my suit stowed, a few other odds and ends done, and I'm back in business again.
005:40:01 Kerwin: Okay. Good deal. We're kind of hanging loose down here. I've got a Lift-off plus 15 PAD. There's no hurry to read it up, so let us know when you're ready.
005:40:09 Lovell: Okay.
This is Apollo Control at 5 hours, 41 minutes. At the present time, we show Apollo 13 to be 24,916 nautical miles [46,144 km] from Earth. The spacecraft velocity is 12,172 feet per second [3,710 metres/second]. The Booster engineer here in Mission Control is currently...
005:41:44 Lovell: Okay, Houston. Go ahead with the PAD.
And we'll stand by for that PAD to the crew.
005:41:48 Kerwin: Okay, Jim. Lift-off plus 15 PAD: GETI, 015:00; Delta-VT, 5622; longitude, minus 165; and GET 400K, 047:04. Over. [Pause.]
005:42:19 Lovell: Okay, Houston. Lift-off plus 15: GETI, 015:00; 5622; minus 165; 047:04. Is that correct?
This is Apollo Control at 5 hours, 45 minutes. Our Booster systems engineers just reported that the first midcourse correction opportunity with the S-IVB, the midcourse correction designed to put the S-IVB on the proper impacting trajectory with the Moon, will be required and it is expected that this maneuver will be a 217-second burn of the two Auxiliary Propulsion System modules on the S-IVB. These modules each produce 70 pounds of thrust [311 newtons] for a total thrust of 140 pounds [623 N]. The Booster engineer also reported that it would probably be required to utilize the second S-IVB midcourse correction opportunity at 9 hours to assure the proper trajectory. Midcourse correction 1 for the spacecraft, the Command and Service Modules, is not expected to be needed. The first midcourse correction opportunity which we would anticipate the possibility of having to make a small midcourse correction would be for midcourse correction number 2 at the scheduled time in the Flight Plan. At 5 hours, 47 minutes; this is Mission Control, Houston.
This is Apollo Control at 5 hours, 59 minutes. We're about one minute away now from the scheduled midcourse correction with the Saturn S-IVB, the third stage of the Saturn. This mid-course correction will utilize the auxiliary propulsion units on the Saturn third stage, each producing 70 pounds of thrust [311 newtons] for a total thrust of 140 pounds [623 N]. The maneuver will be commanded by the Saturn Instrument Unit. It is scheduled to have a total Delta velocity, a change in velocity of about 29.7 feet per second [9.1 m/s]; the burn duration planned for 217 seconds. This maneuver is targeted to impact the S-IVB on the lunar surface at longitude and latitude of about 3 degrees south, 30 degrees west. And our booster engineer reports that the midcourse burn has been initiated at this time.
Program 23 - Optics Calibration/Cislunar Navigation
The P23 horizon sighting, with the associated compensation.
This is Mission Control at 6 hours, 3 minutes. The Booster engineer has just reported that the midcourse correction with the S-IVB is complete. We'll be standing by for an analysis of the results of that midcourse correction. The midcourse correction opportunities scheduled at 6 hours and 9 hours for the S-IVB are intended to impact the Saturn third stage within about 200 kilometers of the Apollo 12 landing site. That would be 200 kilometers west of the Apollo 12 landing site. At the present time in Mission Control, we're in the process of changing shifts. Flight Director Gerry Griffin is coming on to replace Flight Director Milton Windler. We expect that the change of shift briefing will occur at about 8 pm Central Standard Time in the News Center Auditorium. At 6 hours, 5 minutes; this is Mission Control, Houston.
006:15:43 Kerwin: Rog. Would you please verify or tell us what S-band antenna configuration you're in, please?
006:15:51 Lovell: Okay. Stand by. [Long pause.]
006:16:07 Lovell: We're in High Gain.
006:16:10 Kerwin: Roger. Stand by a minute, Jim. Our signal strength is getting a little low. We may have a recommendation. [Pause.]
006:16:21 Kerwin: 13, Houston. Are you in Manual or Auto in High Gain?
006:16:26 Lovell: Stand by. [Pause.] We're in Auto Track, Joe, and High Gain.
006:16:37 Kerwin: Roger.
This is Apollo Control at 6 hours, 17 minutes into the mission. The change of shift news briefing time has been advanced. We're anticipating the change of shift news briefing to begin in approximately ten minutes. Approximately ten minutes, in the news center briefing room.
This is Apollo Control at 6 hours, 38 minutes. The Flight Director Gerry Griffin has been taking status reports from each of his flight controllers. Everyone reports all spacecraft systems looking good. The Flight Surgeon reports the biomedical instrumentation looks excellent - very clean data. He thinks that, when this crew completes this long day, that they'll be tired and get a good night's sleep. They have about another six and a half hours before bedtime today. Booster systems engineer reports the S-IVB has been safed, retaining attitude control and midcourse capability, but that all pressure spheres have been dumped. He also reports to the Flight Director that the second midcourse correction for the S-IVB may be later than Ground Elapsed Time of 9 hours. He wants to get a good tracking vector to use for this final maneuver and he's not quite sure whether he'll do the maneuver at 9 hours or a little bit later after he refines his tracking data. He reports the S-IVB still has 372 seconds of burn time remaining, plus enough fuel in the APS after that to maintain attitude until 12 hours Elapsed Time. The guidance officer is watching Command Module Pilot Jack Swigert perform cislunar navigation tasks. Through telemetry, he's monitoring Swigert's marking stars with the sextant. He's very complimentary of Swigert's ability in this task. On his P23, says this procedure going very smoothly. At 6 hours, 41 minutes; this is Mission Control, Houston.
006:45:42 Kerwin: And, 13, Houston. You can go ahead with the purge and dump at your discretion.
Cutaway diagram of a fuel cell stack.
006:45:47 Lovell: Roger, Houston. What we're going to do is, we're going to get rid of Fred's suit here. Fred's suit has been right in the commander's slot here for the last half hour. So we're going to try and get it stowed.
006:46:00 Kerwin: Okay.
006:46:03 Lovell: You did a pretty good job.
The spacesuits are stored in an L-shaped box in the Lower Equipment Bay.
This is Apollo Control at 6 hours, 46 minutes. We'll take the release line down now while the change of shift news briefing is under way. We will tape any air-ground and play it back after the news briefing. This is Mission Control, Houston.
This is Apollo Control at 6 hours, 59 minutes. During the news conference the air to ground conversation totaled 35 seconds. We have the tape of that now. We'll play that for you and then we will stay up live.
007:17:05 Lovell: Roger. We're at that stage now where we're going to take some Earth weather photography. If you're standing by, I have the camera aimed at the Earth right now, and I'll give you a mark when I take the first picture.
007:17:19 Brand: Roger. We copy, Jim. We'll be standing by for the mark. [Long pause.]
007:17:41 Lovell: Okay, Houston. 3, 2, 1...
007:17:45 Lovell: Mark.
007:17:48 Brand: Roger, copy. [Long pause.]
007:18:17 Brand: And Apollo 13, Houston. Over.
007:18:21 Lovell: Go ahead.
007:18:23 Brand: For the PTC, recommend that you disable quads A and B. Over.
007:18:30 Lovell: Okay. Disable quads A and B, will do; and soon as Jack gets finished thrashing around, we'll be going to that PTC mode.
This is Apollo Control. It's 7 hours, 46 minutes. Apollo 13 now 37,630 nautical miles [69,691 km] from Earth. Velocity, 9,878 feet per second [3,011 metres/second]. Apollo 13 taking Earth weather photography, photographing the Earth one frame every twenty minutes for three hours. Jim Lovell has taken two photographs so far. We have a reminder for the newsmen from the print media. There will be a meeting at 9:30 am tomorrow, Sunday, in the news center briefing room. The writing press will select representatives to fill the Mission Control Center pool positions at that time. 9:30 am Central Standard Time tomorrow. At 7 hours, 47 minutes; this is Mission Control, Houston.
Computer generated view of Earth as it would have appeared from the spacecraft at this time. Flight Plan illustration.
008:02:33 Brand: Apollo 13, Houston.
008:02:36 Haise: Go ahead.
008:02:39 Brand: Aah, Fred, recommend that, when your window comes around facing the Earth again, that you catch another one of those pictures, and at the same time, you should probably start PTC again. We might have sent a confusing bit of info up to you. The 'disable two quads' only applies to an early step in the procedure. We didn't mean that for the latter part of the procedure where we have the statement 'enable all jets.' Over.
008:07:46 Swigert: Vance, Fred said that you had some more information about PTC and a different way of establishing it or something, huh?
008:07:55 Brand: Rog. Referring to the procedure on G/8-2, if you have that open, I'll tell you what we had to give you. [Pause.]
008:08:11 Swigert: Okay. Stand by and I'll get it out.
008:08:13 Brand: Okay. [Long pause.]
008:08:35 Swigert: Okay. Go ahead, Vance.
008:08:38 Brand: Okay. On checklist G/8-2 under step 5, there's a statement, 'disable all jets on two adjacent quads,' and that's what we were referring to when we called up saying 'disable quads A and B.' So that's all fine; however, going down now to step 7 where it says 'enable all jets,' we hoped that you didn't think we meant leave A and B disabled there. In that case, it's as written. All jets should be enabled. Over.
008:09:20 Swigert: Okay. Our checklist has 'all jets' scratched out, and it says 'enable couples on all axes.' So what we'll do is - we'll re-establish this thing and come down to that step 7, and we'll enable all jets. That means enable quads A and B. Is that right?
008:09:42 Brand: That's affirm. You'll have A, B, C, and D enabled for step 7.
008:09:47 Swigert: Okay, real fine. I'll start on it now.
008:09:51 Brand: Okay. Understand you're going to re-establish it. [Long pause.]
008:10:46 Haise: And Vance, on that picture, I was all set to shoot it just a little before you called, and the Earth hasn't showed up in the window yet. I don't know if we got too far off the bellyband or what.
008:11:02 Brand: Roger. Copy, Fred. [Long pause.]
008:11:46 Brand: Apollo 13, Houston.
008:11:50 Haise: Go ahead, Vance.
008:11:52 Brand: Roger. On the photo, you'll probably have to re-establish the attitude for PTC and then whenever it comes into the window again, why we'll just be standing by for the photo. [Pause.]
008:25:06 Swigert: Hey, Vance, would you monitor our rates and kind of give us an idea of when you think they're stable enough to start PTC.
008:25:14 Brand: Rog, Jack. We'll take a look and let you know as soon as they look stable enough.
008:25:19 Swigert: Okay. I've got quads A and B disabled here.
008:25:24 Brand: Roger. [Pause.]
008:25:32 Swigert: Have they come up with an idea of how much fuel I used on the docking and also the P23 session at 5 hours or 6 hours. [Pause.]
008:25:47 Brand: I think we can give you something. Stand by a minute.
008:26:59 Brand: Apollo 13, Houston.
008:27:02 Swigert: Go ahead.
008:27:04 Brand: Okay. It's looking good so far as RCS consumables are concerned, Jack. You're standing about 20 pounds above the curve right now. Looking at the TD&E, you expended 65 pounds or - Stand by - 55 pounds, correction on that.
008:27:27 Swigert: How much?
008:27:28 Brand: And 14 pounds on P23s. You used a little more out of quad A than out of the others.
008:27:37 Swigert: Okay. Thanks, Vance.
008:27:38 Brand: Rog.
008:27:42 Swigert: Hey, could you say again the TD&E fuel? We've got a different - we all heard different things.
008:27:49 Brand: I said 65 and then corrected that to 55 pounds.
This is Apollo Control at 8 hours, 51 minutes. Tracking of the S-IVB since its first midcourse correction indicates that a second midcourse correction will not be necessary. I repeat; a second midcourse correction of the S-IVB trajectory will not be necessary, based on tracking to date since the first midcourse correction. The booster systems engineers plan to wait until about 10 hours Elapsed Time before making a final decision on whether to perform a midcourse. They want to get further tracking data from some other stations, and will have it by that time. The present indications are that the S-IVB is on the proper trajectory to impact the Moon at the planned impact point, and a - Booster has come up with a time based on present indications, a prediction that the impact will take place at 77 hours, 49 minutes, 23 seconds. He says he will update this time later, but that's the prediction at the present time. His studies all show that capability to command the midcourse will exist until an Elapsed Time of 13 hours, 48 minutes. Capability to command attitude control will exist to the same Elapsed Time; 13 hours, 48 minutes. And, we at present have capability to track the S-IVB until an Elapsed Time of 84 hours, 42 minutes which is well past the predicted impact time. Apollo 13's altitude now 43,653 nautical miles [80,845 km] from Earth. Velocity, 9,069 feet per second [2,764 m/s].
009:24:11 Brand: Jim, Houston here. Two items: first of all, your PTC is looking very good and it should carry you through the night; second point, have a procedure to give you, if you're ready to copy. We'd like to set three bits in the computer, and I'll explain why. [Long pause.]
009:24:43 Haise: Go ahead, Vance, we're ready to copy.
009:24:46 Brand: Okay. The procedure is as follows: Verb 25, Noun 07, Enter; 1331, Enter; 7, Enter; and Enter. Explanation as follows. During the P23s, there was one time when Verb 37 was entered into the computer at about 16 seconds after the Optics Zero switch was flicked to Zero. This is a very uncommon anomaly in that, if you do this during - point - four tenth of a second interval at around 16 seconds after you zero the optics, some OPT-mode bits are reset; and this would mean that, if you had a OCDU fail, it wouldn't be indicated; so all this procedure is doing is setting these three bits back again where they should be.
009:26:01 Swigert: Okay, Vance, and I guess I'll try to be slower on that Verb 37.
009:26:07 Brand: Yes. Actually slower or faster, either one, I guess. Well, yeah, slower. It's a very unusual thing to have that happen.
009:26:19 Haise: Okay. And, Houston, stand by for a mark on another picture.
009:26:24 Brand: Rog. Standing by.
009:26:33 Haise: 3, 2, 1...
009:26:36 Haise: Mark it.
009:26:39 Brand: Roger. We copy, Fred. [Long pause.]
009:26:54 Swigert: Okay, Vance; we've completed that procedure, and let me know if everything was okay. [Pause.]
009:26:59 Brand: Okay, thank you. We'll let you know if anything isn't okay. I'm sure it's good now. [Pause.]
009:27:15 Haise: Tell G&C and Guido thanks a lot for keeping good track of me, there.
009:27:21 Brand: Rog. They're right on the ball. [Long pause.]
009:27:36 Brand: And, 13, Houston. If you would like, we can let you know about every 2 minutes before the Earth should be coming into your window. We think we've got it pegged down pretty well now, and you won't have to look for it so much. Do you want that?
009:27:54 Haise: Yeah. That would be fine, Vance.
009:27:56 Brand: Okay. [Pause.]
009:28:06 Brand: And, 13, Houston. Guido says the bits are reset - rather, are set.
This is Apollo Control at 9 hours, 32 minutes. The Booster systems engineer has just advised Flight Director Gerry Griffin that he and his group are going to pack it up and move out, meaning that no midcourse correction number 2 will be required for the S-IVB. The midcourse correction number 1 for the third stage of the booster has placed it on a trajectory which is calculated to impact at - into the Moon at the desired point. Several of the Booster people will stand by to continue to monitor, but at this point everything looks and the majority of the people at that position will be ending a very long day for them and leaving the control center. To repeat, no midcourse correction number 2 will be required for the S-IVB. This is Mission Control, Houston.
009:46:04 Brand: It's time for Fred to start looking for the Earth, should be coming by in about a couple of minutes.
009:46:10 Lovell: Okay. He's got his head out there right now.
009:46:14 Haise: Yeah. You've got that pretty well pegged, man. There it be.
009:46:21 Brand: Doesn't that give you confidence?
009:46:26 Haise: Yeah. I guess so. In a minute, you're going to hear my kitchen timer ding, and that also says the Earth is there.
009:46:39 Brand: Okay. [Long pause.]
009:46:57 Haise: Okay. Stand by, Vance, for our countdown. [Pause.]
009:47:09 Lovell: 3, 2, 1...
009:47:12 Lovell: Mark.
009:47:15 Brand: Roger. We copy.
009:48:50 S/C: [Music. Hall of Montezuma] [Long pause.]
009:49:51 Brand: Apollo 13, Houston. Over.
009:49:54 Lovell: Go ahead, Houston.
009:49:56 Brand: Rog. We're enjoying Fred's music there. [Pause.]
009:50:04 Lovell: Yeah, [garble] up here.
009:50:09 Haise: Yeah, I kind of like it too, Vance. [Pause.]
009:50:15 Brand: Yeah, we - we didn't hear much of it, though.
This is Apollo Control. Fred's music was a few bars from the Marine Corps Hymn. Obviously recorded on the on - one of the on board tape recorders. Lunar Module Pilot Fred Haise is a former Marine aviator.
010:59:13 Brand: Jim, we're coming up on a handover between sites. You might lose comm momentarily.
010:59:20 Lovell: Okay. Understand handover, we might lose the comm.
010:59:23 Brand: Roger.
This is Apollo Control at 11 hours. That handover will be from Goldstone to Honeysuckle, taking place now. Apollo 13 is 53,925 nautical miles [99,869 km] from Earth, velocity 8,093 feet per second [2,467 m/s].
011:13:56 MCC: You should have the Earth coming into view here shortly.
011:14:02 Swigert: Okay. [Pause.]
011:14:12 Haise: We got a new CapCom now. [Long pause.]
011:14:29 Brand: No, I changed my voice. [Long pause.]
011:14:58 Haise: 3, 2, 1...
011:15:01 Haise: Mark.
011:15:03 Brand: Roger. Copy.
011:15:08 Lovell: That was negative, Houston. Say again.
011:15:12 Brand: We got your mark, Jim.
011:15:16 Lovell: Okay.
011:16:53 Haise: Hey, you still there, Vance?
011:16:56 Brand: Rog. Go ahead.
011:16:59 Haise: I guess the world really does turn. I can see some of my landmasses now. It must be Australia down near the bottom and I guess we haven't really figured out what's over the - to the left. It must be some part of Asia. China, probably.
011:17:19 Brand: Hey, maybe the fact that you verified that the Earth really turns, we can call this Haise's Theory, huh? [Pause.]
011:17:32 Haise: Very good, Vance. Very good.
011:17:36 Lovell: It's looking good for you, Vance.
011:17:39 Brand: No, seriously. Very interesting, we can see on the map now that you're between Guam and Hawaii and a little bit north, and you're almost out 60,000 miles [110,000 km].
011:17:58 Swigert: Yeah. I just did a P21 and we had 55,900 [103,500 km]. [Pause.]
011:18:08 Brand: Okay. That's pretty good.
011:18:12 Swigert: I'll let you look at it again here. [Pause.]
011:18:24 Brand: Incidentally, we're looking at a replay of your TD&E stuff here and the TV looks pretty good. First chance some of us had had to see it. [Long pause.]
011:18:47 Swigert: Okay, Vance. In R1, there's our altitude in tens of miles, 55,290 [102,400 km]. [Pause.]
011:19:01 Brand: Okay.
011:20:14 Brand: Apollo 13, Houston.
011:20:18 Lovell: Go ahead, Houston.
011:20:19 Brand: Okay. Looking at our computations back here, we show you about 55,450 [nautical miles, 102,690 km] and going out rapidly now.
011:20:33 Lovell: Well, HAL might be a little bit off.
011:20:36 Brand: Okay.
011:20:37 Swigert: We have a sign underneath our LEB DSKY that 'my name is HAL.'
011:20:45 Brand: I can't imagine how that got there. [Pause.] Just remember, you have to be nice to HAL.
011:20:55 Swigert: We will. [Pause.]
011:21:04 Swigert: I think this PTC's going to work out good. I been watching it here for the last hour here.
011:21:13 Brand: Good. It's looking good here. [Pause.]
011:21:26: (Music - Aquarius)
011:21:44 Brand: Good Lord!
011:23:57 Lovell: Houston, 13.
011:24:02 Brand: 13, Houston. You're very weak. Please repeat.
011:24:07 Lovell: Vance, to our calculations, we have taken about 10 Earth window photography pictures. I see nothing coming up here except to close the waste stowage vent here in a little while. I was thinking about getting squared away to bed down for the evening pretty soon. [Pause.]
011:24:35 Brand: Okay. That sounds good, Jim. FAO here would like to request just one more picture before you bed down, if you don't mind.
011:24:47 Lovell: Okay. We'll come through with one more picture.
011:30:40 Brand: A couple of items, Jim. The first is, the time for closing the waste stowage vent is 12:24. If you turn in before that time, why it's okay as far as we're concerned down here to close it before that time, just before you go to bed. The second point, we have some results on the P23s, and, if Jack's interested, we could give him the corrected altitudes we're getting, and so forth.
011:31:18 Swigert: Yeah. I sure am, Vance. [Pause.]
011:31:26 Brand: Okay. This is preliminary results, but it will give you some indication. Corrected altitude is turning out to be 17 plus or minus 4 kilometers, and the fact that it's plus or minus 4 kilometers indicates that you're being very consistent in judging the altitude. The effective altitude is turning out to be 10 plus or minus 12 kilometers. Comments are that, as I said before, you're being consistent on the horizon selection. The substellar point error is averaging 15 arc-minutes and if you could hold the rates to a minimum, you might shoot for 5 arc-minutes. That's the only comment there. Over.
011:32:31 Swigert: Okay. We'll try doing it better next time.
011:32:35 Brand: But, they're real satisfactory. [Pause.]
The LM/CM Delta-P gauge displays the difference in pressure between the Command and the Lunar Module when the vent valve is set to that position.
012:09:37 Brand: 13, Houston.
012:09:41 Haise: Go ahead.
012:09:42 Brand: Only other readouts we need are those on page 3-13 of the Flight Plan. Bat C, Pyro Bat A, Pyro Bat B, RCS A, B, C, and D readings, and DC Indicator select Main A or B.
012:10:07 Haise: Okay. Stand by. [Long pause.]
012:10:49 Haise: And, Vance, we're still charging Bat B. Did you want to dispense with that in a few minutes? [Pause.]
012:11:06 Brand: Stand by on that, Fred. [Pause.]
012:11:13 Swigert: Okay, Vance, I've got your readouts on page 3-13 of the Flight Plan.
012:11:17 Brand: Okay. Ready to copy.
Typical consumables update box, with annotations.
012:11:20 Swigert: Okay, Bat C is 37, Pyro Bat A is 37, Pyro Bat B is 37; RCS A, 94 percent; B, 95 percent; C, 93 percent; D, 96 percent. [Pause.]
012:11:41 Brand: Roger. Copy that. [Long pause.]
012:12:23 Brand: Apollo 13, Houston.
012:12:28 Haise: Go ahead.
012:12:30 Brand: Okay. In answer to the battery-charging question, I calculate it should be fully charged at 12:35. Play that one, though, the same as the waste vent. If you want to do it earlier because you're turning in, why that's fine with us.
012:12:52 Haise: Okay, we'll continue on with a few other things we got to get done, and just before turning in, we'll check with you, and you can remind us then.
This is Apollo Control at 13 hours, 8 minutes. We don't anticipate any further conversation with the crew tonight. At least we do not intend to put in any more calls to them. Apollo 13 crew settling down for a 10-hour rest period. Apollo 13 is 63,312 nautical miles [117,254 km] from Earth; velocity, 7,358 feet per second [2,243 m/s]. We'll take the release line down now. Come back up at approximately an hour with a status report. If there is further conversation, we'll come back up and bring that to you. This is Mission Control, Houston.