Spacelog Apollo 13

Okay, this is just a precaution, Jack. If we park the optics with a 90-degree shaft angle, that will line up the slits so it gives you the best airflow over that part of the heat shield and avoids a hot spot. If you don't remember it, I don't think it makes much difference. It's just good procedure.

Okay.

Okay. OPTICS POWER, OFF; stow the optics.

Okay, that's good, Okay. The next thing we'll do is to initialize the EMS and that's on entry checklist page 2-1, step number 2.

Okay, perform EMS initialization per entry checklist page 2-1, step 2.

Okay, that's correct. Now we're coming up on EI minus 45 minutes, and we'll give you an entry pad and a final state vector.

Okay, at minus 45, entry pad and final state vector from MSFN.

Okay. Now we're going to perform what we call the Moon check. Rather than go into detail, if you already know what we're doing, just say so; otherwise, I'll describe the use of the Moon-attitude set.

Maybe you better describe it.

Okay, Jack. You remember everybody in the past has commented on seeing Moonset just a couple minutes prior to EI, and your horizon will probably be dark at the time that you get there; you're having an early morning entry; and coming in from the west, you'll still be looking at a dark horizon. So, just as a backup technique, just like you would track the horizon, we're going to give you an attitude which will be on the pad so that you can look directly at the Moon. This is an inertial attitude; it won't be changing, and you'll put the 36-degree window line on the Moon, and then just sit there and watch it. And just prior to EI, the Earth will come up and occult it, and you will then have a good horizon check. And I have some times, and I'll give you that later. And if you just look at this thing now, at that point you can set the GDC or whatever you desire. And you will have a known attitude reference. It's just like a horizon check.

Okay, I maneuver to the Moon check attitude; at which time I put the 36 window line on the Moon, and just prior to EI, the Earth will occult the Moon.

That's correct. And that corresponds to the same inertial attitude that you'd have on the back of your entry card where it shows the horizon attitude several minutes prior to EI; it's the same thing.

Yes, that's that one at 17 minutes prior. Okay.

Okay, and we're just getting it in a little closer. Okay, the next item on the check—checklist here is an EI minus 40; we're going to panel 7, and it's BMAG NUMBER 2 POWER to WARM UP.

Okay, panel 7: BMAG NUMBER 2 POWER to WARM UP.

That's correct. Now, I'd like to verify the SURGE TANK and REPRESS PACKAGES are ON.

Verify SURGE TANK and REPRESS PACKAGE are ON.

That's correct. On panel 5: circuit breaker ENVIRONMENTAL—CONTROL SYSTEM; WASTE WATER/URINE DUMP HEATER, two of them, closed.

Panel 5: CB ECS, WASTE H₂O/URINE DUMP HEATERS, two, to close.

That's correct. SUIT COMPRESSOR number 2 to OFF.

SUIT COMPRESSOR 2 to OFF.

That's right, Jack, and what this—what we're planning to do in order to conserve power is we're going to run the suit compressor from an hour to this point at minus 40. And we'll be watching the PCO₂; if that thing's working, we'll turn it off at the earliest time that we have a good cabin, and then we'll just leave it off. And in the event that the PCO₂ gage isn't working properly or something like that, well, we'll just go ahead and run it for this time frame.

Okay, that sounds good.

All right. Now we're at EI minus 30. SEQUENTIAL, LOGIC, that's two of them, to ON, up.

EI minus 30; SEQ, LOGIC, two, ON.

Okay, in panel 7: the BMAG number 2 POWER to ON.

Okay, we—you only gave that 10 minutes for the warmup, huh?

That's okay.

Okay.

All right, and FDAI POWER to BOTH.

FDAI POWER to BOTH.

Okay. And we want to activate the primary evaporator.

Okay, activate the primary evaporator. All this time, Ken, what've we been getting our cooling? Right now, I think we have the radiators at PULL TO BYPASS.

That's correct. We started out that way, and we turned the glycol pumps on, and we're just circulating it internally. And we're counting on the command module being a heat sink; it's pretty cold soaked, and it looks like this is good enough. You got some relatively low heat loads —

Okay.

— and we'll keep watching the temps, and if we need it, why we'll start the evaporator early.

Okay, that sounds good.

Do you believe it's cold up there?

Yes, and we used to call the command module the bedroom and it's now the refrigerator.

Okay, just don't call it the reefer. Okay. At about EI minus 19, we get back into the standard entry checklist on page 2-2, where it starts with P61.

Okay, at EI minus 19, we get back into the entry checklist at page 2-2, where we start entering P61.

Okay, Jack. Now that's the—those are the time-line notes I had for you. I hate to tell you this, but I also have a couple of corrections to make to the entry checklist. They aren't corrections, they just are pieces of the entry checklist which will correspond to what I've written—already read to you. And I'm ready to go on that whenever you are. And Vance tells me you can get into the descent water for drinking now.

We can get into the descent water for drinking, huh?

Yes.

Sounds good.

Hey, go to it.

Jim would like to know whether the descent water will be good until LM jettison?

Okay, Jack. Looks like we're going to go on the ascent tanks at 128:30. And it looks like —

Okay, understand. We are going —