Spacelog Apollo 13

Okay. VERB 49, yaw plus 27100, pitch plus 35500, roll plus 33000. And do you think it's cheaper to manually make that maneuver or take the 0.2-degree range and go in AUTO maneuver?

Fred, we're recommending AUTO maneuver. Over.

Okay. AUTO maneuver, and could you give me a GET right now.

Okay. I understand you want GET of the burn. Stand by 1.

That's negative, Vance. What is your clock reading right now?

Okay. When I give you a hack, it will be 73:59, and that's about 40 seconds away.

Okay. I think we will make one last check there with the half-unit vectors for 74 hours before we leave this attitude.

Okay. And I'm going to calculate in the 2 seconds in giving you the time hack coming up on 73:59:00 when I give the mark. Okay. Stand by.

MARK.

Looked good.

Okay. I understand you got it.

You want me to PROCEED one more time on that, Jack?

Roger. Yes, go ahead.

Oh, it's on; it's a center.

That's it, she's right on still. Okay. I have, too. That's better than I expected.

Okay. Let's do a VERB 74 and get out of here.

If we can. Go to P00? Okay. I'm going to go to -

…

737100. Roger. 35500, plus 33000. …

Okay. That's —

Yaw, pitch, and roll.

Let me see. No, that's yaw, pitch, and—Okay. Everything's … … That's roll, pitch, and yaw.

Roll, pitch, and yaw.

Everything … yaw.

The roll's going to be down here, but the yaw will be off the bellyband. … procedure, or don't you have a procedure?

Roll, pitch, and yaw, but drift's the one. That would be gimbal lock if it wasn't for being off …

And, Houston, I see that this maneuver gives us a roll of 27172, a pitch of 08301. Is that what they gave us?

This is Houston. Please repeat.

Houston, did you give us VERB 49 in yaw, pitch, and roll, or register 1, 2, and 3?

We gave it as yaw, pitch, and roll.

Okay. We wrote it as roll, pitch, and yaw.

Okay, Jim. We read it to you as yaw, pitch, and roll, and we should have given it to you registers 1, 2, and 3; but we did not. So register 1 is 33000, register 2 is 35500, and register 3 is 27100.

Okay, Vance. Register 1 will be 33000, register 2 35500, register 3 27100.

Hey, Fred? Stand by on that.

Okay. Plus 27100. Okay. Stand by. Right now you can enter …

Okay. Apollo 13, Houston.

Go ahead.

Okay, Jim. We sorted it out, and it is correct the way we gave you the first time. So, R₁ 27100, and in the LM, that's yaw; R₂ 35500, and that's pitch; R₃ 33000, and that's roll in the LM. Over.

I agree with you. Okay. 5018, it's there, and 5018, and that's what it will be. Okay.

That's right. That's VERB 49.

There are 25. 25, ENTER.

Okay. Plus 27100, plus 35500, plus 33000.

Okay.

So far we're … what can we do about it?

Apollo 13, Houston. You better watch that middle gimbal. Over.

Roger. We're watching that middle gimbal. We have as a roll, 27172. Our yaw is—that's register 3—3300. How did we get this?

And, Apollo 13. We have a procedure for you describing how to widen the deadband to 5 degrees later on. But stand by for that.

Apollo 13, you're heading for gimbal lock. You better stop everything.

Yes, we're back in ATT HOLD now. We're trying to stop it.

Apollo 13, Houston. It looks like VERB 49 maneuver will just take you right through there. You're going to have to go around it. Over.

Okay. That's what we're in the process of doing.

Si, si.

We're manually working our way around it, Vance.

Okay.

Pitch is 083.

How do I work my way around it? I'm 58g's, and I want yaw 231, right? I think they screwed up on our—our numbers again.

Zero out the needles; we're heading that way, and then we'll stop and talk about it.

No. Pitch is 83. Pitch should be up here. … … What's the number, 552?

Pitch should be 83 degrees. …

Roll 232; that's a long way to roll, … yaw is 62 …

… yaw.

… roll.

…

Okay. What's that read; there's 180.

Roger.

… is over here. Houston, 13.

Go ahead, 13.

There's something screwed up on our burn attitude. We're not getting the proper readings on the ball and the needles are centered. I'm not too sure what's wrong. Let's go through this procedure again.

Okay. Stand by 1. Let us look at it.

— angles you gave us, Vance, aren't correlating the VERB 49 numbers.

Okay. We'll check into it.

We know the ball is good. Why don't we just get a 40?

You better watch out; it's heading that way.

Apollo 13, Houston.

Go ahead, Houston.

Okay, Jim. To answer your last question, do you have PGNS checklist page 57 handy?

Right, we do. I'll check it.

As soon as you open up to that, I'll explain it.

Okay. Go ahead, Vance.

Okay. Under VERB 49, crew-defined maneuver, the flashing 0622 are the angles that we gave you that were loaded. The flashing 5018 actually represents FDAI angles, and so what you read on 5018 should —

Right. I understand.

— should not correspond with NOUN 22.

Yes. We appreciate that, Vance. It's just that right now we're trying to follow center needles that appear to be possibly taking us away from the place we know we want to be in the ball.

Okay, You're tending toward the gimbal lock area again. Heads up.

Roger.

There's our 83. —

Apollo 13, Houston.

Go ahead.

13, request you put in the POWER AMPL circuit breakers so that we can take a look at your angles.

You got it.

Thank you. And now high bit rate.

Apollo 13, Houston.

Go ahead.

Okay, Jim, we just took a look at your angles, and you're looking good here. Your PGNS is looking good. We can't yet explain the attitude error needle thing, but I suggest you continue on in your maneuver.