Spacelog Apollo 13

Two things, Jim. We want you to know that there's some pretty big attitude errors in, so if you go to AUTO, the computer is going to try to crank you around, and the other thing is don't drink water out of the LM.

Okay. You might think about this. You know we lost our oxygen pressure in the command module.

Aquarius, we're finished with the uplink. The computer is yours, and you can open the UPDATA LINK circuit breaker.

Okay. We've opened up the UPDATA LINK, and we've gone OFF of DATA, and I've got 16 20 in the computer.

Roger, Jim. I guess we're going to just kind of perk away here now.

Okay, Jack. One more question about Odyssey here.

Go ahead, Jack.

Okay. How about the service module O₂ supply valve? Do you want that off?

Affirmative. Service module O₂ supply off, Jack.

Okay. On the way.

And, Jim, we see a PROGRAM ALARM in there. We think it's just got to do with pulling the UPDATA LINK circuit breaker—UPLINK too fast.

Roger. I don't see it. Should I reset?

Houston, Aquarius.

Go ahead, Aquarius.

One thought that might occur here is that if we have low descent water pressure, we might consider taking the PLSS water and fill it in reverse. If that works, you might look at a procedure for that.

That's a good thought. Let us bounce that around a little.

Okay, Jim. That's a good thought, and we've looked at that, and it looks like that's feasible. So if and when we need to do that, we will.

And, something else, Jack. When it's time for me to make my 90-degree yaw, what I planned on doing was going to NOUN 76 hold and just pulse and yaw several times until the yaw start and hope that pitch and roll stay within the limit.

Roger. It sounds like a good plan and you can use your TTCA in MIN IMPULSE to take care of pitch and roll.

Okay.

Aquarius, Houston. We see ASCENT O₂ tank number 2 building up again, so we'd like to use something out of it, so turn on ascent O₂ tank number 2 and turn off descent O₂.

And, Aquarius, Houston. We're starting to think about CO₂ buildup up in the command module there so we've got a recommendation, and what we're recommending is that you take the commander's hoses in the LM and put a cap over the red return hose and then figure out a way to fasten those hoses so they blow up into the CSM by extending them up through the tunnel as far as possible. And we'll get some flow out the blue side, circulate up and around the command module and to keep the CO₂ level down.

Roger. We're thinking of that too, and one problem is that the COMM is connected securely to the hose, so we've got to get the COMM cable off somehow to get that—So we'll still have COMM down here in the LM and you have the hose up there.

Houston, we're trying to extend that commander's hose by use of the vacuum hose.

Sounds like a good plan if you can work that out, Jim.

Aquarius, if you can shake Jack loose there, I've got a—some procedures for him to write down.

Okay. Stand by.

Okay, Jack. Is this a long one?

Oh, it's about 12—15 lines. It's a matter of verifying some valves and so forth.

Okay. Go ahead.

Okay. We want you to go in when you can and verify the following valves and leave them as we outline here. REPRESS PACKAGE valve, off; EMERGENCY CABIN PRESSURE, off; DIRECT O₂, off; DEMAND REG, off; both WATER ACCUMULATORS, off; MAIN REG A and B, open; WATER GLYCOL—correction—WATER and then GLYCOL TANK INLET and OUTLET, both. Now if you want to get some water, we recommend that you momentarily turn the SURGE TANK on to pressurize the system and then turn it off and take out water as required. Over.

That's it, Jack. And another note on taking water; if you don't drain enough water so that —

Say again, Aquarius.

That wasn't us, Jack.

Okay. One more note on the water, Jack. If you don't bleed the pressure off when you—don't take enough water to bleed the pressure off completely, the pressure that's left on there is going to drain away in a period of 1 to 3 hours. So it's a small amount of oxygen, but we might as well save it. So if you want to eliminate that problem you could completely drain the pressure off by putting the water in a water bag and saving it that way.

Okay. That's a good idea.

So that's the end of my —

What I'll do—let me repeat—Okay. Let me repeat it all back to you. REPRESS PACKAGE VALVE, off; EMERGENCY CABIN PRESSURE, off; DIRECT O₂, off; both the DEMAND REGs, off; both H₂O ACCUMULATORS, WATER GLYCOL ACCUMULATORS, off; MAIN REG A and B, open; WATER and GLYCOL TANK INLET and OUTLET, open; for water, momentarily pressurize the SURGE TANK, take out water as required. You're recommending drain out all the water until I can't get any more water out of it in order to conserve the oxygen.

Okay. We just want you to turn off the water accumulators and not the glycol accumulator. Over.

Okay. These are the water accumulators on 382, right?

Houston, Aquarius.

Aquarius, Houston. Go.

Roger, Jack. We're asking whether P51 and a P52 are required in the back side of the Moon.

I think so, Jim, but stand by while I verify it.

Aquarius, Houston.

Go ahead.

We think we know where the platform is, Jim. The tracking looks real good from the last burn. We feel just a P52 will be required.

Okay.

Joe, has your continued tracking changed our pericynthion altitude any?

Stand by. We'll get the latest on that, Jack.

Aquarius, Houston.

Go ahead.

Roger, Jack. We're still looking at 137 miles and Doppler's confirming it. We will have a good update after 67 hours.

That's good. I want to say you guys are doing real good work.

Aquarius, Houston.

Go ahead, Houston.

Okay, Jim. We've come up with a COMM recommendation which we hope will save some power by powering down the power amplifier, if it works. And I'd like to read up the steps to you and have you think about them for a minute, and we recommend trying it before the first yaw maneuver. Over.

Okay. You can read up the steps.

Okay. Step 1, BIOMED off; step 2, go to LOW BIT RATE; step 3, go to DOWNVOICE BACKUP; step 4, POWER AMP to PRIME; step 5, panel 16, POWER AMP CIRCUIT BREAKER open; step 6, RANGE FUNCTION switch, off. Read those back to me, and then I'll have a remark.

Okay. BIOMED, off; LOW BIT RATE; DOWNVOICE BACKUP; POWER AMP to PRIME; circuit breakers, panel 16, POWER AMP CIRCUIT BREAKER, open. RANGE FUNCTION switch, off.

Okay. And the note says that you should be able to hear us. If we can't hear you in a couple of minutes, you should close the POWER AMP circuit breaker on panel 16, and we expect to save an amp or more on this. It should work in the present attitude. When we go to the new yaw attitude, we're thinking about powering up the steerable, leaving the POWER AMP off and, if we can get good COMM in that mode, we'll still save some power. So if you concur, why don't you go ahead.

Okay. In this mode, you should hear us—or we should hear you, but if you can't hear us, then we ought to close POWER AMP circuit breaker again. Is that right.

That's affirm. We'll just run a little COMM check after you get done and see how we're doing.

Okay, fine. And if that all fails, we'll go back to our original configuration.

That's affirm.

All amps PRIMARY.

POWER AMPs in PRIMARY.

Okay. Circuit breakers 16, POWER AMP circuit breaker, open; COMM; POWER AMP circuit breaker, open.

There's only one. Ready?

RANGE … switch off.

It is off. …

Yes, I think so; yes, that's off.

… Okay, Houston; Aquarius. How do you read me?

Aquarius, this is Houston. We read you with a lot … static. How do you read us? Over.

We read you with a lot of noise, the noise seems to indicate … read you better.

I didn't copy your last remark, Jim. I heard that you had a lot of noise in the background also.

Okay, Houston; Aquarius. How do you read us now?