Spacelog Apollo 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.

13, Houston. We see you now in the AUTO maneuver. How are your error needles looking now?

Okay. They look like they are working their way in, Vance.

Okay. You think maybe they are working right now?

Yes. Because we got a 270-degree roll, our pitch and yaw needles are reversed.

Okay.

Say, how do you read, Vance? …

Fred, you are starting to fade out. Request AFT OMNI, OMNI AFT.

Okay. You've got AFT OMNI.

Thank you.

13, Houston.

Okay, Houston; Aquarius. We appear to be there—at the burn attitude. And now do you want us to change the DAP?

Roger, Jim. We have a procedure to give you for widening the deadband to 5 degrees for the PTC in the next 3 or 4 hours, if you're ready to copy.

Okay, stand by.

Go ahead.

Okay. VERB 21, NOUN 01, ENTER; 3011, ENTER; 44, ENTER. Now, that's the procedure for widening the deadband to 5 degrees with the DAP. Later on, prior to the burn, you would return the deadband to 1.4 degrees, and if you're ready to copy, I'll read you that.

Stand by.

Okay.

Go ahead.

Okay. To return the deadband later to 1.4 degrees: VERB 21, NOUN 01, ENTER; 3011, ENTER; 200, ENTER. Over.

Okay, Vance. To widen the deadband, we'll enter a VERB 21, NOUN 01, ENTER; 3011, ENTER; 44, ENTER. Before the burn to go back to narrow deadband, it's VERB 21, NOUN 01, ENTER; 3011, ENTER; 200, ENTER.

Roger, Readback correct.

And, Houston, I'll guess we'll do this PTC in yaw, and do you want them all powered down?

Stand by.

Okay, Apollo 13. Over.

Go ahead.

Okay, that's affirm. You'll be doing the PTC in yaw, and we'll give you a call at each time you change yaw—yaw attitude. Aside from that, request low bit rate off; then DOWN VOICE BACKUP OFF; then POWER AMPL OFF; and then FDAI OFF.

Okay, Vance. On the power down, we go low bit rate; DOWN VOICE BACKUP, we'll pull the POWER AMPL breaker; and we'll power down the FDAI and the AC.

That's affirm. And the AOT, too.

Okay, are you all set for old a -

Okay, Houston; Aquarius. How do you read DOWN VOICE BACKUP?

Reading you loud—loud and clear now, Fred.

Okay.

Oh, Vance, do you want to stay in this attitude for a certain length of time before we start maneuvering?

Roger. Jim, we'll keep you there for about an hour, and then we'll have our first 90-degree rotation.

Okay. How wide do I make the deadband?

Say again.

… the other OMNI's in.