Spacelog Apollo 8

And the one I ended up with reads 3.10.

Okay. Thank you.

Okay. Go ahead, Ken. What else do you want to talk about?

Okay. To make everybody happy, we can use an estimate of the number of hours sleep the people got.

Just a minute, I'll give you that; I forgot. Bill Anders got about 5 hours, and Jim Lovell got about five, and I got about five and a half or six.

Sounds good. Okay. We went through an exercise with the mockup on the preentry preparations, and we noticed that in the LMP's checklist on page S-12, when you go to top off the repress bottles, I believe it is a misprint; it should read the PLSS fill valve rather than the REPRESS valve, and we should be going to the FILL position as opposed to going to ON.

Roger. That's what we do.

Okay. And on—go ahead.

Go ahead. We agree that's what we do.

Okay. On page E-7 of the entry checklist and under step 34, as long as you have panel 382 open, that's a convenient time to go ahead and have the evaporator water controls, both primary and secondary, to AUTO, and the suit heat exchanger for the secondary glycol to FLOW.

Those items are already accomplished.

Very good. On page E-9, when you are getting ready to transfer the RCS to the command module position, if you want to avoid having the engines fire as a result of attitude correction, you might want to take the manual attitude switches to ACCEL COMMAND or MINIMAL IMPULSE. And again on E-9 Alfa at step 41 Bravo, if you want to go back to attitude hold, bring your manual attitude switches back to RATE.

What was that last step?

Step 41 Bravo on page-E-9 Alfa. It's if you decide to use either MINIMAL IMPULSE or ACCEL COMMAND on page E-9, step 41 Bravo would be a good place to go back to RATE COMMAND.

Okay. We do a purge or —

Okay, fine. And —

I didn't put all those control configurations changes on the checklist, but that's exactly what we did, used MINIMUM IMPULSE.

Houston, Apollo 8.

Go ahead, 8.

Apollo 8, Apollo 8. Go ahead.

I'd like to confirm one item on the PAD message, please.

Roger.

Time to retro-drogues, reference you last time to drogues, please.

Okay. I'll check that one out.

And also, Ken, we are going to turn on our VHF now, about 4 hours before entry.

Real fine. Thank you. I'll let you know when we pick it up.

A Simplex.

Apollo 8, Houston.

Go ahead, Houston.

Okay. We have checked into your drogue time, and the number of 08:16 on your entry PAD is correct. We'll be giving you an updated entry PAD on the scheduled time of 143:30. At the same time, we'll be giving you an update of your state vectors for the LM and CSM. The midcourse correction number 7 was less than seven-tenths foot per second, and we will not execute it. You have a P52 scheduled at 143:30 which is not required. It's your option. However, if you decide to delete the P52, the CMC self-check and DSKY condition light test are still requirements. Over.

On that DSKY check . ..

Apollo 8, Houston. That's my mistake on CMC self-check and DSKY condition light. That's an optional test. Over.

That's what we thought, Ken. Gosh, if that's been working perfectly for 6 days, I don't see any reason to test it.

I agree.

Thank you.

Morning, Ken. How's Houston this morning?

Just fine. Nice and balmy.

Houston, Apollo 8. Over.

Go ahead, Apollo 8.

Apollo 8, go ahead.

I am just—It is my understanding that we are to bring up the secondary loop at 1 hour prior to SEP, isn't that right?

That is affirmative, about page Echo 9.

Okay.

And Bill, … suggested if we have the water boiler going on the primary loop, that you—you might wait about 5 minutes or so before you initiate the secondary loop.

Wait 5 minutes from what? From the time the primary loop starts or from 1 hour?

From the time the primary loop starts; this will give you a check to see if it had a chance to dry out or not.

Oh, I am with you. Okay.

And for your information, we already have a VHF downlink. It's poor quality, but we do have contact.

Okay. We haven't turned anything over to VHF yet.

Okay.

We tried to call you on the VHF though, Ken.

Roger. I say, the quality is pretty poor; they may not be able to understand you.

Houston, Apollo 8. Over.

Go ahead, Apollo 8.

Apollo 8, Houston. Go ahead.

Ken, we got two things going here which make this suit heat exchanger flow a little different. One of them is we are not doing a coldsoak, and the other one is we are powering down the secondary loop prior to SEP. And I wonder if it is a good idea to have the suit heat exchanger only on a secondary loop in that case. And plus the fact that we haven't got any cabin heat exchanger.

I don't think that was the intent, Bill. What they had in mind, we have the suit heat exchanger on both loops; and if they got too cold, you could use the panel switching to shut down the primary loop through the heat exchanger. But in any event, you would always have something going to the suit heat exchanger. I recognize that we are going to be shutting down the secondary heat exchanger pre-SEP and then turning it back on prior to entry, but the idea was to have both primary and secondary loops on the suit heat exchanger simultaneously.

Yes, my checklist doesn't reflect that. I think that's a good idea because we are a little suspect of our cabin fans and don't plan to use them.

Houston, Apollo 8. Over.

Go ahead, 8.

Apollo 8, Apollo 8. Go ahead.

Apollo 8, Houston. We will be making a handover from, Carnarvon to Honeysuckle at 15.

Houston, Apollo 8. Over.

Apollo 8, go ahead.

I am still a little bit confused on that- on this activating the secondary loop. You indicated inactivating it at 1 hour or 5 minutes after the primary evaporator comes on the line. My checklist shows that the primary evaporator probably won't come on the line until we bypass the radiators. Have you got something else in mind I don't know about?

Okay, Bill. We passed up an update some time back on page E-9 step 38 right at the beginning, and you have got a final GET drift check. And between there and the step 39 where it says terminate CM RCS preheat, that was the place we wanted to activate the primary loop by putting the glycol evaporator water switch to AUTO and the glycol evaporator steam pressure to AUTO.

Roger. I don't expect it to boil, though. Do you?

Okay, Bill. We are hoping that it will there. It looks like we will have had a stable attitude for sometime, and we anticipate that it will be warm enough to make it boil. That is the reason it's suggested if it is boiling, that you wait. If it isn't, go ahead and turn on the secondary loop.

Okay. Well, that's where I was confused. I am waking up. Thank you.

Yes, sir.

Apollo 8, Houston.

Go ahead, Houston.

Okay, Apollo 8. We would like to update your LM state vector, CSM state vector, and target point. If it is convenient now, why, we will go ahead and do that if you will go to P00 and ACCEPT.

Apollo 8, Houston.

Go ahead, Houston. Apollo 8.

Okay. The loads are in and verified, and the computer is yours.

Okay.

You can take it back to BLOCK, and for Bill's information, latest guess from the main bus post-SEP voltage to 27.5

Guess! You mean the EECOM's are guessing?

At least, they are honest for a change.

That is more than you can say for the computers.

Apollo 8, Houston.

Apollo 8, Houston.

Go ahead, Houston. Apollo 8.

Okay, 8. We have an entry PAD for you.

Good. Just a minute.

Ready to copy, Houston.

Houston, Apollo 8. Entry PAD as follows: mid-Pacific, 357 152 359 146:29:30 268 plus 0813 minus 16503 065 36221 645 12122 36301 146:46:14 0028, next block not applicable, 400 0212 0025 0334 0814 16059 312, Zeta Persei, up 165, right 35 up, use nonexit EMS pattern, backup alignment; Sirius, Rigel, roll 308, pitch 209, yaw 357, and we won't need P65.