Spacelog Apollo 13

Jim, that's affirm. That pad is still valid.

And that is assuming no midcourse 7 here at 105 hours.

That's affirm.

Aquarius, Houston.

Go ahead.

Jim, we're setting up your burn for 105:30, and we'll be working up a pad, et cetera, based on that time. Over.

Roger. The time will 105:30.

And, additional point; I guess this one's for Jack. Do we have any idea why we couldn't read the MAIN BUS B voltage a while back when first he didn't get it and then later he did?

Yes. I think we have a reason for that. Stand by.

It appears, Vance, that the battery charge circuit breaker which appeared to be in, wasn't in. Fred pulled it and reset it, and then he started getting readings.

Roger. Which circuit breaker was that?

It was—It was the battery charge circuit breaker that allows you to read volts, but we haven't—don't know the exact name for it yet.

Okay. Understand.

The name is BATTERY CHARGER BAT B CHARGE Jack tells me.

Okay. BATTERY CHARGER BAT B CHARGE.

Aquarius, Houston.

Go ahead.

Have you opened your—just curiosity—Have you opened your food locker just aft of the LM data file? Over.

Yes. It's been opened.

Okay. Just checking. Thanks.

. .. meal had come through.

Good.

It came at the right time.

Aquarius, Houston. Over.

Go ahead.

Jim, we have some CSM temperatures here for you that might be of interest, if you're ready to copy.

Roger. Go ahead.

Okay. Your quad package temperatures range from 85 degrees to 44 degrees. Your CM RCS injectors range from 44 degrees to 21; and your heat shield is well above its lower limits in all the various locations. Temperatures appear to be cycling based on Sun angle, and it's no sweat. They all look very good.

Were you calling, Houston?

Negative, Jim.

And, Houston, how do you read Aquarius?

Read you loud and clear, Fred. How do you read?

Okay. …

Roger. We were just about to send you up some items of information pertaining to the burn. Are you ready to copy?

Stand by.

Okay.

Okay. Go ahead, Vance.

Okay, Vance. You're saying we should start into the PREP in the contingency book at about 104:30, and I'll talk this over in a minute with Jim and we'll get back with you on it. When in the burn attitude, we should see the Sun right at the top of the AOT, and I assume this is detent number 2. Jim and I'd already been talking about that, and just eyeballing the terminator in the Earth, we figured the Sun at about something like a 70-degree angle—65-degree angle, so that'll be right up there. We get one burn rule that says if the rates are greater than 10 degrees per second, shut her down. And, after we trim, you want me to leave 470 up for a while so you all can have a look at it, and you'll tell me when to get rid of it.

That's right, Fred. And, if you have any questions at all regarding the alinement, why please let us know. We'll be happy to answer them, like alining on the Earth, as was described before. Also, you should know that the pitch is the most critical attitude so far as errors are concerned in this burn; but, as I said, it's still not very sensitive.

Yes, the—and unfortunately, the way we're looking out the window through the COAS, we can aline the yaw and roll pretty well, but it's the—Sun that has to get us pitch.

Right. And—and a correction on this DEDA 470 thing. Request that we let you—Give you a GO before you trim. Over.

Say—Say again, Vance, on that last.

Roger. We would like to see address 470, and give you a GO before you trim. Over.

Roger. Go ahead.

Okay. The picture that Jim gave me on his view through the COAS was within the—the partial Earth, the lit portion laying in the top half of the COAS with the cusp laying right on the Y-Y line. And so the—The whole dark part of the Earth would be at the bottom part of the Earth, except a very thin crescent of the dark part to a line—line above the Y-Y line.

Okay. That is correct.

And that in essence—that in—Yes, that in essence would put our X-axis pointing toward the Sun.

That's correct. The plus X-axis pointing toward the Sun and perpendicular to the terminator of the Earth.

Okay.

Two other points, Fred. One is that we don't expect hardly any misalinement of your engine for the burn, so we don't really expect any rates throughout the length of the burn, especially since it's at very low thrust. Second point, request you verify that your suit temperature rheostat's in FULL COLD. That—if it—If it were in FULL COLD, that might help your cabin temperature situation. It might bring the temperature up.

Okay.

Okay. The latter was a good point. We had it in FULL HOT.

Very good.

And Roger on the—Roger on the rates, too.

Okay.

Okay, Vance. Is the T_ig time going to be approximately—Is it 105 or 105:30?

It's 105:30.

Okay. Your 104:30 time to start in is—sounds pretty good. That'll give us lots of time to get set up with the attitude business, in case we have any trouble stopping PTC and getting there and—That will give us a little time to be sitting and waiting, all set up.

Aquarius, Houston. Over.

Are you calling, Vance?

Right, Fred. We just noticed a 2-pound drop in your water quantity. Have you guys had a drink recently or do you know any reason why it might have dropped? Over.

Negative.

Thank you.

Aquarius, Houston.

All right. Go ahead, Vance.

Fred, that may be a funny in the data. The rate's gone back to normal; and we'll keep an eye on it, but we don't think you should worry about it too much.

And, Houston, Aquarius.

Go ahead, Aquarius.

Are we going to get any sort of a pad on this?

That's affirm, Fred. Estimating we'll have it to you in about 15 minutes.

Okay.

And, Houston, you might just let us know if there's any chance it's going to slip further down the road, because we're going to kind of hold to that 104:30 start time. And if you're going to delay any, we'll delay accordingly.

Roger. We won't have any trouble making that, Fred, I'm told.

Hello, Houston; Aquarius.

Go ahead, Aquarius.

Roger. We have about 104 degrees now. How does that …?

Okay. FIDO's hustling here. We'll try to get it right up to you. Stand by.

…

Aquarius, Houston. Over.

We have …

Aquarius, Houston. Over.

Vance, we have the quad heaters on, now.

Roger. Copy, Jim. And the—Jack's going to read you the pad right now, so I recommend you go ahead and get started. You shouldn't be delayed by the pad at all.

Aquarius, Houston. I've got your burn pad.

Roger, Houston. Stand by. Are you ready—Stand by to copy. Okay. Ready to copy.

Okay. A P30 maneuver pad on the DPS: purpose is midcourse 5, NOUN 33, 105:30:00.00, NOUN 81 is N/A, H_A is N/A, perigee, plus 0019.8, 0.007.8, 0.15, the rest is N/A. Shut down the engine at 1 second prior to the end of burn time. Shut down at 14 seconds manually. Ullage is four jets for 10 seconds, 10-percent throttle. Go ahead.

Okay, Jack. We've got a DPS midcourse 5: NOUN 33, 105:30:00.00; NOUN 81, N/A; H_A N/A; plus 0019.8, 0007.8, burn time 0.15, the rest of the pad, N/A. Shut down manually at 14 seconds, ullage four jets for 10 seconds, and the entire burn is at 10-percent throttle.

Okay, Fred. I want to verify that your DELTA-V_R is 0007.8.

Okay. I read you back 0007.8.