Spacelog Apollo 13

Okay, Houston, do you want to follow up on page 15 with RCS checkout? In essence, we've kind of already done that.

You're right, Aquarius. Let's delete the RCS checkout. And a DPS looks GO.

Houston, we're going to do a PGNS AUTO maneuver to the attitude.

Stand by on that. Aquarius, we recommend driving it around there manually with a TTCA.

We're going to AUTO now, Houston, to try to damp the rates. We're at the attitude.

Roger, Jim. We verify the attitude.

And, Houston, we'd like to confirm, do you want the VERB 65 ENTER in there?

Affirmative on the VERB 65.

Okay.

Okay, Jack. I got another question on page 18. At 1 minute, I concur with MASTER ARM ON, but I wonder why I have to have the ABORT STAGE breaker in. We sure don't want any staging now.

Aquarius, delete the ABORT STAGE circuit breaker CLOSE. Leave it open.

Roger. Will delete.

Okay. Also, Jack, since we have four-jet ullage versus two, do you want—still want 10 seconds ullage or do you want 5 now?

Okay, Aquarius, we'll use automatic ullage.

Okay. We'll just let the 7-1/2-second AUTO ullage do it.

Roger, and we'd like to do this in manual throttle, so on page 17 about two-thirds of the way down, THROTTLE CONTROL, MANUAL, vice AUTO.

Okay. We're set to MANUAL.

What's the 203 … ?

ENTER on the 203, Jim.

We've got 203 in the DSKY now and it looks as though it requires work, can we pass it?

Aquarius, ENTER on the 203.

Wait a minute.

Aquarius, we'd like to verify that your throttle is in the MIN position.

That's affirm.

And, in the event that you have to do a manual takeover, turn the ENGINE GIMBAL OFF, MODE CONTROL to ATTITUDE HOLD, and use the hand—use the TTCA.

Roger.

Okay, 1 plus 30 to burn.

Roger.

Okay, MASTER ARM's ON; 1 minute.

Roger, Aquarius. You're GO for the burn.

40 percent.

Okay, Aquarius. You're looking good.

AUTO shutdown.

Okay. You're looking at 1685 now, Jack.

Okay. You're GO in the residuals, proceed.

Okay. When you say GO on the residuals, you mean don't trim them. Is that right?

That's affirmative. No trim required.

Roger.

Okay.

Aquarius, check your MASTER ARM OFF, please.

Okay, Houston. Burn's complete. Now we have to talk about powerdown, and what do you want us to do with the PGNS?

Roger. We're looking at that right now, and you'll be the first one to get the word.

And, Houston, it's doubtful right now whether we'll be able to see the stars in this configuration. The only way we could possibly get alinement is with the Earth and the terminator or the Moon and its terminator and I'd sure like to have you look at a powerdown—keeping the PGNS if at all possible.

Roger, Jim. We'll get the word for you.

And, Houston, we're in an ATT HOLD mode, can we turn off the buses?

Okay, Aquarius. We're working on what's going to happen next. In the meantime, we'd like to take some high-power items off the line, so on panel 11, open DECA POWER, and open DECA GIMBAL. On 16, open the ATCA breaker.

I figured it. Let's just make it a good one.

We're looking real close at water usage profiles, and right now things are kind of swinging toward leaving the IMU powered up and powering down the LGC, but we'll have more word for you shortly. And we recommend for sleeping that you leave one guy on watch. We recommend you don't make any urine dumps if you can help it, because it'll make the debris problem worse than it is now. And we have some items that you might want to transfer to the LM, some towels, some penlights, fecal bags, UTS. And do you have any more items that we can help you out with at the moment?

Okay. Stand by on your latter list there, Jack. I understand no urine dumps. I guess we'll work through the UCD and all the bags we got; and real quick there, can you give a DAP load that we want in here now to conserve the RCS.

Okay. For attitude control coordinates, we're recommending manual control VERB 76 and watch your middle gimbal angle. Your DAP load that you have now looks good.

Aquarius, our decision for the time is to leave the IMU powered up, power down the LGC, and power down other nonessential items. We'll be coming up with a more precise checklist as soon as we can get it. Over.

Okay. The decision is to keep the platform, power down the computer, and we'll be standing by for further word on the powerdown, Jack.

Roger.

And, Aquarius, for your information, we now have 136-mile perigee. Confirmed by Doppler.

Okay. 136-mile perigee now. That's very nice.

Oh, wait a minute, Jack. Did you say pericynthion or perigee?

I meant pericynthion.

And, Houston, we pulled out your UPDATA LINK circuit breaker, so if you want to update it for anything, let us know and we'll put it back in.

Aquarius, AFT OMNI, please.

Houston, do you read Apollo 13?

This is Houston. Go ahead. Reading you weakly.

Okay, Jack. We don't want to bug you, but you ought to be thinking—or what your thoughts are concerning what the next burn will be. I got to figure out a watch schedule and the sleep schedule and just how we can meet the next maneuver.

Roger. We're getting you a flight plan update. We're still computing on your next burn, and we're getting ready to give you a procedure for powerdown.

Aquarius, one idea on managing the OMNI antennas. It might make it easier on everybody if we disabled the UPLINK SQUELCH and managed the antennas by switching when we hear the noise. Over.

Okay, Aquarius. Here's what we're going to do. We'd like you to point the LM X-axis either north or south. That's the positive X-axis. It appears to us that it would be closer to orient the LM plus X-axis toward the south. Do that with the LGC powered up using the TTCA. After that, we propose to power down the LGC to save some power. However, this means that we lose the use of the TTCA, and we'll have to control the spacecraft with the hand controller in the DIRECT mode. Request your—your position on these two items.

Aquarius, Houston. How do you read?

Okay, Jack. Understand. You want us to point the LM X—plus X-axis to the south using the TTCAs with the LGC powered up. Then, by powering down the LGC, we'll lose a TTCA. I wasn't too successful in controlling the spacecraft in attitude only, but I might be able to keep it out of gimbal lock.

That's affirmative, Jim. We'd keep your ball powered up and go to DIRECT on the hand controller. And maintain attitude in a DIRECT position.