Spacelog Apollo 13

Okay, The second step was in the LM circuit breakers panel 11 and 16: ASCENT ECA CONTROL, close, two of them. Cross that out. In the next line, we had BATTERY 5 NORMAL FEED, on; cross out BATTERY 5 and put BATTERY 6 in there. In the next line was —

… Jack … Hey, Jack; I have for step 3, I have BAT 5 and BAT 6 NORMAL FEED, on. You just want BAT 6?

That's affirmative. Just BAT 6, Jack. And the next line, you had BATTERY 1 and 3. Make that BATTERY 1, 2, 3, and 4. Just add BATs 2 and 4. All four descent BATs. And then the next two lines about waiting 30 minutes, cross that out. And the next line about BATTERIES 2 and 4 OFF/RESET, cross that out, too.

And, Jack, the —

Okay. Let me read -

Go ahead.

Let me read you all the steps as I've got them, Jack, and make sure we've got them right. … ASCENT ECA, two, closed. Step 2 will now be BAT 6, NORMAL FEED, on. Step 3, BATS 1, 2, 3, and 4, OFF/RESET.

Okay. That part's all right, Jack. And we had—about 11 or 12 steps for the command module. They go as is with no change. And then we had a couple of more procedures for the LM. Stand by 1.

Okay. Jack, let me read you command module procedures just to make sure I have them right, also.

Okay. Go ahead with the command module procedures.

Okay. Connect LM and CSM umbilicals. Step 2, panel 5: LM POWER 1 AC and 2 AC, closed, circuit breakers. Step 3, panel 5: EPS SENSOR SIGNAL, MAIN B, closed. Step 4, panel … closed. Then there's step 5: MAIN B BAT BUS B, closed. Verify MAIN BUS voltage, then switch the LM power to CSM. Step 7: CB MAIN B BAT BUS B, open. And on panel 250, BAT POWER ENTRY and POSTLANDING, open. Verify MAIN BUS voltage.

Okay, Jack. The CSM procedure's okay, and then we had to go back to the LM and do something. And the first line is okay, cross out “BAT 5 and 6 OFF,” delete that. And delete the next line also, that says “Panel 11 to 16 ASCENT ECA CONTROL, open.” Then we had a couple of notes which remain the same. Go ahead.

Okay. I didn't get the notes, but I'll read you the steps as I have them now. One step, BAT 1, 2, 3, and 4 … and at this point should have BATTERIES 1, 2, 3, 4, and 6 ON. Is that affirmative?

That's affirmative. So now we have BAT 1, 2, 3, 4, and 6, ON, and I got two notes. Number 1 is: your circuit breaker protection limits—your circuit breaker protection—limits the current to 15 amps. Number 2 note is: now the umbilical between the LM and the command module is hot. And the MAIN BUS voltage can be monitored by selecting MAIN B.

Okay, Jack. These notes are: circuit breaker protection limits current to 15 amps. The tube, the umbilical between the CSM and LM is hot. I can monitor MAIN B for the bus voltage.

That's affirm, Jack.

Okay, Jack. One question here. If we transfer power like this, we're not going to cut us short on power remaining in the CSM …, are we …?

Say it again, Jack. I didn't get it.

Okay. Stand by. If we configure the CSM for powering up the LM, we aren't going to cut it short on LM power requirements to get us back in the entry interface, are we?

That's a negative, Jack. According to the latest update, we've got ampere-hours out to 203 hours.

Stand by. …

Okay, Jack. One question from Jim is, he wants to know whether the procedure has been tried …

Okay. Try it again, now, Jack. What did Jim want to know?

Okay. He would like to know whether the procedure has been tried and whether it has been found to be okay; and there's no danger of shorting out any of our batteries or anything we have on board the LM now.

Okay, Jack. This procedure has not been tried out as such; however, the hardware paths through which the current flows are the same ones which we used during translunar trajectory, and there's not a problem with shorting out a descent battery. Over.

Okay. I'll relay that to Jim.

Jack, of course, the reason for all of this is that we see we're 20 amp-hours short on one of the entry batteries, and we've got to juice that up to get you home with.

Okay.

Okay. What we owe you from here on out is the actual battery A charge procedure, and then a procedure to turn this all around, again.

Okay. Do you have it there, and how long is it …

Okay, Jack. I have the procedure in front of me. It's about 18 steps, and the reason it's so long is because we're starting from this basic configuration which we gave you earlier. It concerns a charge on battery A, of course, which is our low one. So, when you're ready to copy it, let me know.

Okay. Let's go at it.

Okay. Are you ready to read—copy it?

Go ahead.

Okay. On panel 250, circuit breaker BAT A, POWER ENTRY/POSTLANDING, close; on panel 275, circuit breaker INVERTER POWER 2, MAIN B, close. Next several circuit breakers are on panel 5; circuit breaker BAT RELAY BUS, BAT A, close; circuit breaker EPS SENSOR UNIT, AC BUS 2, close; CB EPS SENSOR SIGNAL, AC2, close; CB BATTERY CHARGER, MAIN B, close. Are you still with me?

Okay, Jack. I'll read back those steps you gave me so far. Panel 250 CB BAT A, POWER ENTRY/POSTLANDING, close, panel 275, CB INVERTER POWER 2, MAIN B, close; panel 5, CB BAT RELAY BUS, BAT A, close; CB EPS SENSOR UNIT, AC BUS 2, close; CB EPS SENSOR SIGNAL, AC2, close, CB BAT CHARGER, MAIN B, close.

Okay. Good readback, Jack. The only one is number 1—number 4. I didn't get your readback, but it's EPS SENSOR UNIT AC BUS 2, close. You got that?

Yes. I read that back CB EPS SENSOR UNIT, close.

Okay. To continue—to continue on—the same panel, panel 5: circuit breaker, BATTERY CHARGER, AC POWER, close; circuit breaker BATTERY CHARGER, BAT A CHARGE, close; circuit breaker INVERTER CONTROL 2, close; circuit breaker INVERTER CONTROL 3, close; I've got a switch for you, MAIN BUS TIE, BAT A/C, OFF; and another switch, BATTERY CHARGE to AC2. Read those back.

Okay, Jack. CB BAT CHARGER to AC POWER, close. Stand by. Okay. I had to get a light here. CB BAT CHARGER, BAT A CHARGE, close; CB INVERTER CONTROL 2, close; CB INVERTER CONTROL 3, close; the two switches, MAIN BUS TIE, BAT A/C, OFF; and the second one, BAT CHARGER TO AC2.

How about reaching over there on your right-hand side and turning the BIOMED off? See if we can improve the COMM a little bit.

Okay. How do you read, now?

Jack, about how many amperes of LM power will this 15 hours …?

Stand by. We'll get it for you —

How many, Jack?

Okay. He got it. He got the question.

Okay, Jack. That's going to take 120 amp-hours out of the LM, which is equivalent to 10 hours, which will put us back to 193 hours, and that's plenty.

Okay. Let me relay that to Jim here. It'll be 120 amp hours, which leaves us—which puts us back from 203 hours … to 193 hours.

Yes, there's that much to spare.

Okay, Jack. One question here. If we have any problems setting up this LM power to the CSM, is the quickest way to get out of it, return to the normal configuration, as it is for me to just switch the LM POWER to CSM to RESET then OFF?

Stand by 1.

I would like to give one quick step in case that gave Jim report some sort of problem for us to get out of it quickly.

Okay. Let us talk it over for a minute, Jack.

Okay, Jack. Are you with me?

Yes. We're still here, Jack. What we want to do is follow you through on this, so we're going to get high bit rate to do it. In answer to your question, to undo this procedure quickly, in the event a problem develops, be sure that you don't touch the 124 POWER switch because it's got a RESET position. But the way to undo it is go into the CSM and on panel 5 open two circuit breakers. And they're some of the first ones we read to you. Open LM POWER-1 MAIN B, and open LM POWER-2 MAIN B. You copy that?

Okay. Understand. If I want to get out of this real quickly, I have to open just two circuit breakers in the CSM; that's on panel 5, LM POWER-1 MAIN B, LM POWER-2 MAIN B.

Okay. And before you go ahead with this, let's establish high bit rate and wait 1 on that. And then as we go through the procedure we want you to wait when you get power on MAIN B so we can take a look at MAIN B without any loads on it before we start charging the batteries.

Okay. I understand you want high bit rate on the LM or CSM just before we start this?

That will be high bit rate on the LM, and stand by for it.

Okay.

Okay, Jack. Before we go ahead with this, what we want to do is read you the reverse—the normal reverse procedure.

Okay. I'm ready to copy.

Okay, Jack. I got the start on how you reverse this procedure. Ready to copy?

Go ahead, Jack.

Okay. First you want to reverse the battery charge procedure. To do that, on panel 3, switch BATTERY CHARGE, off; AC INVERTER 2, off; panel 5, MAIN BUS TIE BAT Alfa Charlie, on, up; panel 250, circuit breaker BAT Alfa, POWER ENTRY, and POSTLANDING, open. Read back.

Okay, Jack. On panel 3, BATTERY CHARGER, off, AC INVERTER 2, off; on panel 5, MAIN BUS TIE Alfa Charlie, on; panel 250, CB BAT A, POWER ENTRY and POSTLANDING, open.

That's affirmative, Jack, and then if you'll go back to the rest of the circuit breakers on that list, and just opposite—Open them all up. Stand by 1.

Okay, Jack. Go back to the battery charge procedure I gave you. And, in order to terminate charge, just—You'll just have to write “Open” or “Off” next to the circuit switch that I gave you. So on panel 250, that circuit breaker you've already opened; on panel 275, INVERTER POWER-2 MAIN B, open; panel 5, BAT RELAY BUS BAT A, open; EPS SENSOR UNIT AC BUS 2, open, EPS SENSOR SIGNAL AC2, open; BATTERY CHARGER, MAIN B, open; BATTERY CHARGER AC POWER, open; BATTERY CHARGER, BAT A CHARGE, open; INVERTER CONTROL 2, open; INVERTER CONTROL 3, open; you've already done the MAIN BUS TIE; and then BAT CHARGE switch to AC 1. Over on panel 3, you have already set the AC INVERTER 2 to OFF and then INVERTER 2 AC BUS 2, OFF; AC BUS 2 RESET to OFF. You have already put the BATTERY CHARGER switch to OFF; and your DC Indicator select to MAIN B. Over.

Okay, Jack. Do you want me to read it back to you?

No, if you've got something in the right-hand column for all of those, we don't want to have to do it. And now one more thing I owe you is how to untransfer LM power to the CSM, and I'll get that for you in a jiffy.

Okay. I'll be standing by to copy it.

Houston, 13.

Go ahead.

One thing I guess you probably all have considered it, but what heavy things can we store down there where the SRCs normally go to help increase our L over D?

I understand the question is what kind of heavy things can you store where the SRCs go.

Yes. They go down in the LEB underneath the computer, and the heavier things you have down there increases the L over D. We don't have any SRCs, so I was just wondering what heavy things—We could probably put some cameras, television cameras, things like that that normally pretty heavy down there in—that, in our SRC. No, we can't put the in our SRC, but we could put them in that container down there which would help decrease our L over D. Anything else you can think of would be greatly appreciated because we don't even have a throwaway station, so we're down a little bit in L over D.

Okay. Let me pass that question along, and get somebody working on it.

Souvenirs, I guess.

What souvenirs? (Laughter) All I've got is a Marine Corps foxhole-digging shovel.

You've got all you need then, buddy.

Okay. Ready to copy the power removal from the command module/LM umbilical.

I'm ready to copy. Go ahead.

Okay. This assumes that all the descent batteries are on line and ASCENT BATTERY 6 is on NORMAL FEED, as we said earlier. First thing you do is go in the CSM and look on panel 5 circuit breaker. LM POWER-2 MAIN B, open; LM POWER-1 MAIN A, open; circuit breaker EPS SENSOR SIGNAL MAIN B, open.

Hey, Jack.

Go ahead.

… You got just a little bit scratchy there because of the antenna problem. Let me read this back to you.

Okay. What I got, Jack, was the procedure assumes that all DESCENT BATTERIES are ON, and BAT 6 is on NORMAL FEED. Now we're going into the LM and on panel 5, we take LM, or CM LM POWER-2, MAIN B, open. And that's as far as I got.

Okay, the second one is on panel 5 also. Circuit breaker, LM POWER-1, MAIN A, open; circuit breaker EPS SENSOR SIGNAL, MAIN B, open. Okay, read those back for the CSM, and I'll give you some steps in the LM.

Okay.