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.

Okay. And -