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.

Okay. Let me ask one question, here. About how long do you think it'll take to charge these batteries?