Spacelog Apollo 13

Roger, Joe. Figured, if we're going to do this burn in PGNS now, I ought to give you an update on the contingency book pages 32, 33, and 34, because the last time we went through this portion, we were burning it in ACS.

Okay, Fred. Stand by. We've been talking about possibly having you do it in ACS. We recommend at this time that you do an ACS to PGNS aline, the 400 plus 3 procedure only. Over.

Okay.

And, Aquarius, Houston

Go ahead, Houston.

Roger. We recommend that you perform this burn in AGS, as you did the last midcourse manuever; we think it will save gas. Over.

Okay. Joe, do you want me to line up the same way we did the last one, too?

Stand by on that.

And, Joe, Jack just handed me some injector temperatures, if you want to read these on … so I can plug them in.

Roger. Go ahead with those.

Okay. 5 Charlie, 14.0; 5 Dogs, 3.7; 6 Able, 3.5; 6 Bravo, 4.1; 6 Charlie, 4.2; 6 Delta, 3.8.

Okay. Copy those, Fred.

Aquarius, Houston.

Go ahead, Houston.

Okay, Jim. Our recommendation on this burn is that you maneuver to the burn attitude, in PGNS MIN IMPULSE, then do a body-axis aline, 400 plus 5, followed by 400 plus 0, and then do the burn in AGS. Over.

Okay. Now we're spinning it with the PGNS, what you gave us for a PGNS attitude. Is this the wrong one? Do you want me to just to aline up the Earth as I did before in the last midcourse?

No. We don't want you to do that. Read me your FDAI angles, and let's compare them with what we have down here.

Okay. You're looking at them in the DSKY. I've got roll of 8.47; pitch of about 0.51; and yaw looking at about 3.750.

Okay, Jim. Those are very close—I guess all you need to do is trim them up a bit.

I plan to do a final trim—AUTO trim, and then a four-jet translation.

Okay, Jim. For fuel conservation, we'd prefer you to trim it up MIN IMPULSE, and there's really very little trim required; and then go ahead and do it AGS. We're on the expected fuel usage, but we're just being old ladies about it.

Okay. Understand. My only question, Joe, is the fact that both the roll and the yaw needles did not go to null when I did an AUTO maneuver. I'd tried to go manually to the attitude; and then went to AUTO, but the roll and the yaw do not come in at all.

Roger. I haven't got an answer on that yet, but your attitude looks very close.

Okay. I can take it on …

And, Houston, Aquarius. I'm not sure that if I follow and null the needles, that will be the proper attitude.

Okay. Stand by 1, Jim. We're talking about it. It's going to be very close; in any event, close enough.

Okay.

And, Jim, just for your information, I have the entry pad. I have the landing area weather summary, which you probably don't even have to copy, but which I'll read up to you when you're ready; and some stars for Jack that I'm holding for him for later on.

Okay.

And, Joe, Jack says all the injector temperatures, he just checked them again, and they're all over 3.9 —

That they're all over 3.9 now. Thanks a lot.

You can tell him that it's looking good to us. They were even happy with the previous ones.

Okay.

And, my only question, Houston, is do you want me to null the PGNS needle manually?

Okay. Stand by 1 more minute, Jim.

Houston, Aquarius.

Go ahead, Aquarius.

Yes. I guess the basic question is comparing the balls here and out the window it doesn't look too unreasonable, and I guess Jim says the COAS is yawed and roll slightly off from what he might eyeball; but yet, the FDAI air needles for PGNS are showing a full scale left in roll and full scale left in yaw. …

Okay. Go ahead.

Yes. It appears if we track those we, obviously, aren't going to be on the attitude that we burned the last midcourse.

Okay. Well, this attitude we passed you is not quite alined to the terminator, and stand by on this.

How you doing there, Houston?

Oh, we're getting there, Jim. We're—we're all agreed that you're almost, but not quite, in the proper attitude, and we're just trying to get you one firm recommendation on how to proceed from here.

Okay. I have nulled the null—roll needle and the pitch needle now and I'm yawed—rolled left now. I'm rolled left about 9 degrees.

Okay. Understand the needles are nulled.

The yaw isn't, but the pitch and roll are.

Aquarius, Houston.

Go ahead.

Okay. Here's the big story. Your attitude really looks quite good except in roll, and we'd like you to do the following. In MIN impulse PGNS, we'd like you to trim to zero pitch, which is about where you are now; to 008 degrees in roll, which is about 16 degrees from your present roll attitude; and to zero degrees in yaw, which is about where you are now. Then we'd like you to do the body-axis aline 400 plus 5, 400 plus 0. PITCH and ROLL to PULSE, select AGS, do the burn in AGS. How does that sound? Over.

Okay. I'm rolled the wrong way; that is what you're saying, right?

That's right.

And you know I can't roll in minimum impulse. I've got to use TTCAs.

That's right, Jim. Sorry.

And you don't want me to automatically trim 5018, I take it.

That's affirm, Jim. Don't trim 5018.

Okay.

We just want you to cycle on through P41 to get the average g and burn it out.

Okay.

Aquarius, Houston.

Go ahead.

Just for your information, we see 3.0 in register 1. We read you up 3.1 on the pad. The actual DELTA-V was 3.05, and they warned me that it might come out 3.0.

Okay. That's a little burn.

Right.

Aquarius, Houston. Your attitude looks real good. We will give you a mark at 10 minutes to the burn, which is in 28 seconds.

Okay. We'll burn it in AGS and use the AGS ball.