Spacelog Apollo 13

Okay, 13. You're loud and clear again.

We averaged about 5-1/2 hours' sleep apiece, and we are estimating that the sleep was good.

Okay. Copy that. Let's see what else we have for you, Jim. Midcourse-2 looks like about 23 feet per second, approximately retrograde and on time. And it's holding real firm now. For your information, and you don't need to copy this down, because it's still pretty soft, but we have an S-IVB impact of about 8.57 south and about 33.9 west, which is a little west and a little south of the flight plan value. We have it at a GET of about 77 plus 51 which is just before AOS, and the LOI pads are a little bit late, and as I say, it's still pretty soft, and we'll be updating you with firm numbers.

That's fine, Joe. Just as long as it doesn't hit Cone Crater.

Okay. And I'll have a consumables update for you in a little while, and I have a small flight plan update for you sometime a little later on when you're ready to copy. There's no big deals in it.

Roger.

And, 13, Houston. We'd like to verify that you cycled the O₂ cryo fans. We saw the H₂, but we didn't see the O₂ get stirred up.

Yes, Joe. We did, and it kind of looked like we might have had a little stratification because right after we put them on, we had a CRYO PRESS light.

Okay. EECOM told me that might happen, and he was right.

Okay, Joe. We're ready to copy a flight plan update and your consumables.

Okay, Jack. The flight plan update has a couple of items in it, and the first one we'd like to do is to update the T_ephem values in the G&C checklist on page G/9-2. These are fairly small changes, but in case you need them, we'd like you to have the exact numbers. Over.

Okay. Just a minute. I'll get it out.

Joe, was that the G&C checklist, page 9-2?

That's affirmative. G&C, page G/9-2.

Okay. Go ahead.

Okay. On that page in line 04, column B, change the number from 03366 to 05253. Over.

— 53.

Okay. And in line 05, column B, change from 11000 to 33661. Over.

33661.

Okay. That's right. The only other thing I've got for you, Jack, is three additional questions for the booster systems debriefing, which is to take place at about 25 hours, and we thought we'd pass these questions up to you early so you can consider them. Over.

Okay. We're ready to copy.

Okay. The first extra is, and let me get the original question because this question says, “More specifically on item 2,” and item 2 says, “Were there any significant changes in the noise vibration level during the single stage of powered flight?” Specifically, describe your observations during the early S-II center engine out-off, and approximately 90 seconds prior to TLI cut-off, you reported a high vibration in the S-IVB. We'd like you to describe the buildup of this vibration and its behavior through cut-off. Over.

Okay. Essentially, what you'd like us to talk about is vibration sequence during the early S-II cut-off of the center engine and also describe the vibrations that we encountered during the S-IVB TLI burn. Is that correct?

That's it. Okay. The second extra question is for you, Jim, and it says, “Comparing this flight with your ride on Apollo 8, were there any significant differences in the powered flight environment?”

Okay. We'll describe a comparison with 8 and 13 as far as powered flight goes.

Roger. And the last additional question is what did the ORDEAL ball look like during TLI? As you know, we passed you an update to that setting, and we'd like to know whether it was riding right on zero or what during the burn. Over.

Okay. Will do. We'll describe the ORDEAL ball.

Okay. That's it, and that's the whole flight plan update. I have a consumables update now if you want to listen to that.

Okay, Joe. We're ready to copy.

Okay. At 23 hours the total RCS is 1121, quad A is 274, quad Bravo is 286, quad Charlie is 274, quad Delta is 287, and the cryos are as follows: H₂ tank 1, 83 percent; H₂ tank 2, 86 percent; O₂ tank 1, 87 percent; O₂ tank 2, 87 percent. Over.

Okay, Joe. We got all those, and how do we compare them with where we should be in the time line?

As I understand it, Jack, you're running slightly ahead of nominal in both those areas.

Okay; real fine.

No problem.

And, 13, Houston. That's all the business I got right now. I have a little news and plan of the day for you, if you feel like listening to that a little later on.

Just hold off a little bit there, Joe if you don't mind. …

Stand by one, Jim. You're coming in garbled again.

Houston, 13.

Okay, 13; Houston. Loud and clear again. Go ahead.

Okay. Joe. On the news, Jim would like to hold off a little bit on that, and I want to make a request to FAO, if he will at sometime during the day, when we get a flight plan update with those activities we agreed to make optional during lunar orbit and the few activities we were going to delete, I think that I forgot and left that card back during the press of suiting, I left it in the suit room.

Okay. Wilco.

Okay, Jack. I understand FAO's working on that and we'll have something for you later on.

Okay. We're not in any hurry.

Okay, Houston; 13.