Spacelog Apollo 13

Well, if I—If I get everything done, I'll try, but I tell you, it's almost impossible to sleep. All of us have that same problem. It's just too cold to sleep.

Roger. The way we're looking at it, looks like you ought to have a couple 3 hours here before you have to really get with it.

We'll—we'll take it easy, but I—and we'll try to sleep, but it's just awful cold.

Present data indicates that your entry angle is minus 6.03 degrees. Your DELTA-V at the midcourse is going to 2.8 feet a second.

Okay. Copy.

Jack, this is Jim. I understand this is going to be an RCS burn.

That's affirmative, Jim. It's going to be an RCS burn.

Okay.

And we need the SUIT CIRCUIT RELIEF valve back to AUTO. Correction, back to CLOSE.

Hey, Jack, that's in work. And one thing, comparing Jim's checklist with my own, I find one difference there at EI minus 02:30. His checklist has me changing a—opening a EPS SENSOR SIGNAL circuit breaker right prior to turning off LM power. Is—I'd like to find out which checklist is correct.

Hey, Jack. The LM checklist is just for information to Jim. It's just to tell him that—that you're changing back to command module power. Your checklist is correct. Over.

Aquarius, all of your pads will be coming up in about 3-1/2 hours, at EI minus 06:30. And one thing we want to remind you of, when you remove power from the command module LM umbilical, is to be sure that you open the LM POWER MAIN B circuit breakers, both of them, before you start throwing switches and circuit breakers in the LM. Do it as we've outlined it in the procedure, in that order. Over.

Okay. That's the way we planned on it. We'll let Jack do his three and then he'll tell us when we're GO from there. What pages are those changes on?

Okay, Fred. The one I've got for you is at the end of power removal from the command module LM umbilical. And just for your information, after you go through that entire procedure and about the time you're ready to transfer to the command module, at that time, power will be removed from the umbilical, and it's okay to disconnect it. That is, after you've thrown the switches in the LM. Is that clear?

Roger. That's where I've got a remark here to check with you to see if it's all right to proceed.

Roger. And that would be just after, on panel 16, you opening ASCENT ECA CONTROL breakers.

Which step number is that?

The confusing thing is, Jack, where they told me to wait for MSFN GO before proceeding was that BAT 2 LOW VOLTS OFF/RESET, then ON.

Okay. That's still affirmative. We'll give you a go after waiting 5 seconds, and then down from there just a few steps, after you have opened the ASCENT ECA CONTROL breakers on panel 16, at that point, the umbilical is not powered, and it's okay to disconnect them should you care to do so.

Okay. After the last step then, I'm free to disconnect.

Right. And one other change we have is, shortly after that, where we're configuring for jettison, we have closed both the FORWARD DUMP valve and the OVERHEAD DUMP valve. And we don't want to get in a locked up position like that, so one way to get around it is to—After we close the FORWARD DUMP valve, turn the DESCENT OXYGEN valve off. Over.

Okay. After the FORWARD DUMP valve, add a step in that says the DESCENT OX valve, off.

Okay, Fred. That concludes the DELTAs. And perhaps you heard that our GAMMAs are still minus 6.03 and our DELTA-V will be a 2.8-foot-per-second RCS burn.

Roger.

Fred-o, we've got one more change we'd like to give you to clarify a question that Jack asked earlier. At EI minus 02:30 —

Okay. Hold on a minute, Jack. I meant to call Jack back down. I'm not familiar with the previous discussion.

Negative. This is on your checklist.

Okay. Go ahead.

At E mi—EI minus 02:30, during power removal from the umbilical, first thing we do is two steps with the CSM. We open the MAIN B, the LM POWER to MAIN B circuit breakers, and then there's a third step which says “Circuit breaker EPS SENSOR SIGNAL, MAIN B, open.” Just delete that step. Over.

Okay. Delete the third step.

And, Aquarius, for your information, as far as our water supply is concerned, including our plans for powerup, we have an additional 18 hours of water remaining from this point.

Okay. Eighteen hours of water remaining from this point, Jack.

Hello, Houston; Aquarius.

Hello, Aquarius. Go ahead.

Okay, Jack. This is Jim. I just want to make sure that you're filtering the changes to the checklist that come up to make sure that they're absolutely essential. When we learn our procedures, we can only do it one time, and we can't make changes at the last minute. We'd like to do the best, the safest way possible, but unless the changes are really essential, don't bother sending them up.

Roger. We won't. The chairman of the CPCB is still active, and one thing we're trying to do is to save you all the time we can between EI minus 02:30 and 1 hour.

That's affirm. That's a real important time.

Yes. For your information, Jim, I don't know whether you heard that originally, but that time from 2-1/2 to 1 in there has been run about three times, and it's pretty tight, so we've tried to weed out what we could, which isn't much, but I think the other message you might impress on Jack when you get around to alining that platform, don't try to get it down too neat. It doesn't have to be all that good. Just do a nice quick and dirty one, and that's going to be good enough anyway.

I concur. I think for reentry we don't have to have a real accurate platform, but I haven't told Jack that.

Roger. Hey, Jim, while you're up and things are nice and quiet, let me give you a couple of other things to think about. One specifically. I know none of you are sleeping worth a damn because it's so cold, and you might want to dig out the medical kit there around 01:35 or in that ballpark, and pull out a couple of Dexedrines apiece and try one about then, and another around 01:39 to 01:40.

Well, I hadn't brought that up. We might—We might consider it.

Okay.

Wish we could figure a way to get a hot cup of coffee up to you. It'd probably taste pretty good about now, wouldn't it?

Yes, it sure would. You don't realize how cold this thing becomes when it's in a PTC mode that's slowing down, and I just clocked the cycles on my … And it's about 11 to 12 minutes now, and the Sun is directly overhead, so it's shining on the engine bell of the service module and not getting down to the spacecraft at all.

Hang in there. It won't be long now.

Aquarius, Houston.

Go ahead, Houston.

Not a bad idea.

And, as you can see, Houston, at turnon we got our old friend downlink 2 back.

Aquarius, Houston. It looks like you're proceeding toward the gimbal lock there. We'd like you to check that, please.

Roger. Not much we can do about it. We can't use the thrusters, Houston.

And, Houston, Aquarius. I guess the next thing for the PGNS will be a coarse aline 000, but I guess we ought to hold up now until we get enough time on the RCS thrusters.

Aquarius, Houston.

Go ahead.

Roger. Did you get my GO for RCS?

That's affirm. We're GO. What we're doing now, Jack, is letting the spacecraft drift in this mode to pick up the Earth again.

Okay.

It's going to be interesting today, Jack. The Earth's a lot bigger; the crescent is a lot more pronounced than it was yesterday.

Well, you're going in the right direction.

That's right.

And, Jack, I guess we haven't changed our angle much with respect to the Sun 93 million miles away, so it ought to be in about the same place in the AOT, isn't that Charlie?

Hold 1 on that, Fred. I'll get an answer for you.

Okay.

Aquarius, your ASA is warmed up now. You can activate the AGS.

Aquarius, Houston. When you look out a detent 2 in the proper burn attitude, what you ought to see is the Sun at 12 o'clock, about halfway between the top of the AOT and the center of the pipper. And you ought to see the Earth —

Okay.

— at 6 o'clock.