Spacelog Apollo 13

We're considering powering down the PGNS but we want to know what capability you have to do a coarse and fine aline. We read your conversation about being unable to see out the window very good. How about out the AOT?

He's looking now.

Okay. And the other thing we thought you might try is to put the service module between you and the Sun and then to see if you can see anything out the window in that attitude.

The reason that we think that that would work is that it worked on Apollo 10. It made the constellations all recognizable when we put the the service module—in our case a LM, between us and the Sun.

AFT OMNI, Fred.

You're down in the mud again, Jack. It appears that some other circuit is feeding through on there with you.

Roger. AFT OMNI.

Aquarius, AFT OMNI.

Okay. You're down in the mud again, Jack. Lots of background static.

AFT OMNI, Aquarius.

Hello, Houston; Aquarius. How do you read?

Hello, there, Aquarius. Loud and clear. How me, now?

Okay, we're reading you loud and clear, Jack. I hope it stays this time.

Okay. We'd like to brief you on what our plan is. We're, at this time, water critical in the LM. So we'd like to use as little as possible. To do this, we're going to plan to make a free-return maneuver of 16 feet per second at 61 hours, which is 37 minutes from now. Then we're going to power down the PGNS, and then we'll—at 79 hours, we'll go ahead and make another abort maneuver to kick what we got. But we'd like to get that PGNS powered down as soon as possible. That would be after the midcourse and—so how do you feel about making a 16-foot-per-second burn in 37 minutes?

Well, we'll give it a try, Jack, if that's all we've got. That's a 16-foot-per-second DPS burn in 37 minutes?

Roger. We're working up a pad for it, but we'd want to know what you think about doing it at that time.

Well, we'll do it. Could you give us a little bit more time?

Okay, Jim. We'd like to get a suggested time from you. We can figure out a free-return maneuver for any time you want to give us, so if you'll give us the time you'd like to shoot for, we'll figure out a pad.

Okay, that sounds good. I think if we have a little bit more time; we want to do it right. Stand by 1.

Let's shoot for an hour if we can, Jack. How's that.

Okay, Jim. How about 61 hours and 30 minutes? That's an hour and 5 from now.

Okay. We'll do it and we want to be sure we talk back and forth now to make sure we get this burn off right.

Affirm.

Okay, in the interim, Jack, I looked around again and I saw that we have a radar and a landing-radar heater breaker in. Can I pull those out?

Affirmative. Pull them both out.

And now we want to ask you a question about alinements, and so forth. We wanted to know if you can see any stars out of the AOT. We also wanted to know if you could use the service module to cast a shadow on the LM windows and then look out the windows to see stars for a PS1 COAS alinement.

Okay, in this attitude, Jack, that we're pitching around, I cannot use the AOT to see stars. We—we're just not able to see them at all. Now we may be able to maneuver off in yaw or—and/or roll and see stars. Right now, we haven't been able to. The AOT is useless. The command module structure is just radiating too much light into the—into the telescope.

Okay, and how about using the service module to cast a shadow on the commander's window? If you do that, can you see stars for a COAS alinement?

We could give that a try, Jack, although I don't know how successful it will be. We tried to do it—The light shines off our quads which makes it difficult to see stars. We do have the Earth and the Moon, if that can be of assistance.

Another problem—Right now, Jack, I'm looking out the right window and it's pretty dark out that window but there are about a thousand or so false stars out here from—left over from some of the debris. It's hard to discern what's real and not real.

Okay, will do. And also, let me ask you a question. In this configuration, docked, we have to use the TTCA to control pitch and roll. And, just how much can we use that without really changing our trajectory? We only have 60 miles to play with.

Roger, we'll put that to them.

Okay, Jack, are you ready to go to work with me on the 2-hour DPS activation and contingency book, page 1?

Roger, we're ready to go.

Okay. Item one, we can—one through five, we can scratch off, as done. Is that correct?

Stand by 1, Fred.

Okay, Fred, let's go ahead. Step 1, page 1. Everybody's listening.

Okay, I've looked around, and I've essentially done steps 1 through 5 with the exception of floodlights and utility lights and I think we'll just do without those.

Roger. Your choice.

Okay, on EPS activation, we're through step—we're through that—bottom of that page. That's all done.

We concur, page 2.

Okay, in essence, we've circumvented step 4, and we're not sitting with all 4 aps—descent BATs on high-voltage taps, so I'll scratch off step 4.

Roger, and in step 5, we want to leave INVERTER 1 circuit breaker OPEN.

Roger. In step 5, we'll leave INVERTER 1 CB OPEN.

Omit step 6.

Okay, for the time being, our mission timer is the computer so, mission timer activation scratch off.