Joe Kerwin (CAPCOM)

Okay. Good deal. One other detail for you, Jack; GNC tells us that the OPTICS jitter is very similar to what we had on Apollo 12. It's no problem, but when you're not using the OPTICS, we recommend that you turn the OPTICS POWER switch to OFF to guard against a possible degradation as the flight progresses. Over.

Joe Kerwin (CAPCOM)

Okay. Apollo 13, Houston. I have one more little update for you, and it's another update to the erasable memory onboard crew charts on page G/9-2. Over.

Jim Lovell (CDR)

Houston, 13. We're ready to copy.

Joe Kerwin (CAPCOM)

Okay, Jim. These are gyro compensation terms. They've already been uplinked, and we're just updating your onboard charts now. In column A, number 11, change from 77646 to 00114; number 12, change from 77332 to 77546; number 13, change from 76617 to 77201. Over.

Jim Lovell (CDR)

The changes are as follows, and all in column A: number 12, the new change is 77546; number 11, the new change is 00114; and 13, the new change is 77201. Over.

Joe Kerwin (CAPCOM)

Roger. Readback correct.

Jack Swigert (CMP)

And, Joe, do you know—Are you going to try and let us spot the Bennett Comet on this next revolution there? Or do you want me to turn the OPTICS power off now?

Joe Kerwin (CAPCOM)

Stand by 1, Jack. Okay, Jack. We don't have confidence on those roll angles yet, so why don't you turn the OPTICS off, and we'll update you later.

Joe Kerwin (CAPCOM)

Roger, Jim. If you've got a couple of minutes now, I'd like to read up to you the change to the LM entry procedure that we'd like you to observe at 55 hours, and the rationale for it. Over.

Joe Kerwin (CAPCOM)

Okay. Before you start copying, this procedure is—is basically simply to activate the supercritical helium pressure gaging so that you can read it. And the concern here is lest this supercritical helium pressure reach 1800 psi by 103 hours, at which point we'd be within a possibility of rupturing the burst disk when you activate the DPS. Now, based on the pressure at launch, and based on a nominal rise time of about 6-1/2 psi per hour between then and now, the pressure should read about 710 psi. Stand by, 13, until we get better COMM.

Jim Lovell (CDR)

Houston, you were cut out. Would you say again about the helium pressure.

Joe Kerwin (CAPCOM)

Roger. Based on the prelaunch pressure in the SHe tank and the nominal rise time of about 6-1/2 psi per hour, the pressure should be about 710 at 55 hours. Are you reading? Over.

Joe Kerwin (CAPCOM)

Jim, Houston. Did you read that last?

Fred Haise (LMP)

Okay, Joe. I 'm on OMNI C now. How do you read?

Joe Kerwin (CAPCOM)

13, Houston. You're loud and clear now. INCO tells me he's having a little problem at Goldstone and wants me to stand by for a minute.

Fred Haise (LMP)

Okay. How do you read now, Joe? I'm going from OMNI C to D now.

Joe Kerwin (CAPCOM)

You're still loud and clear on—on D, Fred. Stand by 1.

Fred Haise (LMP)

Okay. I'll put her back to OMNI B if you all want to take command again?

Fred Haise (LMP)

And the last thing we heard, Joe, was that the SUPERCRIT should be reading about 710 psi.

Joe Kerwin (CAPCOM)

Okay. That's the last thing I passed up. And while we're waiting for INCO to decide here, let me continue. The deadband that is considered acceptable is between 660 and 770 psi. In other words, any rise time that'll give you one—a pressure between those two, will keep you below the critical pressure at 103 hours or so. So, we expect it to read in that—in that band and if it does, there will be no problem. If it reads between 770 and 800 psi, we will want you to check the pressure again at about 59 hours, and I'll get the detailed procedures in a minute. If the pressure is equal to or greater than 800 psi, we're going to have to go into some more detailed procedures; we're going to try to—to get PCM data on it, for one thing. We may have to have you sit there and stare at the gage for a while to find out when it clicks up and get an accurate rise time on it, and then in extreme case, we are even thinking about a DPS burn, but we don't really think that will happen. Now, if you are ready to copy, what I have for you is a change or an addition to the LM Activation checklist between pages TLC-1 and TLC-2, which consists of seven steps, and if you can find a blank side to write it down on, I would like to pass it up. Over.

Fred Haise (LMP)

Okay. How do you read on OMNI C, now?

Joe Kerwin (CAPCOM)

Okay. You're loud and clear on OMNI C. Stand by 1 while we get INCO synced up.

Fred Haise (LMP)

Okay. The rest of your update was that it's okay if it is anywhere between 660 and 770 psi. If it's above 770, you are going to ask us to consider going back in at 59 hours and either get PCM going or sit there and give you gage reading changes on the basis of that. And you said something about an extreme measure. We may have to consider some sort of DPS maneuver.

Joe Kerwin (CAPCOM)

That's correct, Fred. We don't have procedures for that yet, and we don't have any real expectation of getting into it. The procedure I'd like to read up to you now is simply the steps required to get the supercritical helium pressure reading at 55 hours. Over.

Joe Kerwin (CAPCOM)

Okay. We're calling this TLC-1A, step 6, “Transfer to LM power.”

Fred Haise (LMP)

All right. Stand by 1, Joe.

Jack Swigert (CMP)

Okay, Joe. He's ready to copy.

Joe Kerwin (CAPCOM)

Okay. Step 6, “Transfer to LM power (floodlights blank), CAUTION WARNING POWER CAUTION light ON. Report GET to MCC. Panel 11, CIRCUIT BREAKER EPS TRAESLUNAR BUS TIE, CLOSED. Circuit breaker panel 16, EPS TRANSLUNAR BUS TIE, CLOSED. Circuit breaker panel 11, LIGHTING UTILITY, CLOSED. And activate utility lights.” Over. And, 13, Houston. Select OMNI Bravo, please.

Fred Haise (LMP)

Okay, Joe. I've created a new page here called TLC-1A, item 6, Transfer to LM power and the usual check that the floodlight's blank and that I've got the CAUTION WARNING POWER light ON; I get a GET from Jack, and I will pass that on down to you. Item 7, CIRCUIT BREAKER EPS TRANSLUNAR BUS TIE, panels 11 and 16, CLOSED. Step 8, circuit breaker lighting and utility on panel 1, CLOSED, and turn on the utility lights. However, the lighting is such that I don't really need those. They are in stowage, right now, I guess, in the ISA, and I'll probably just leave them there.

Joe Kerwin (CAPCOM)

Okay. That's optional. The way we had page TLC-1A written, that was all part of step 6. You haven't even gotten to step 7 yet. Step 7 is as follows.

Joe Kerwin (CAPCOM)

Fred, Houston. Are you with me?

Joe Kerwin (CAPCOM)

Apollo 13, Houston. Are you reading me now?

Fred Haise (LMP)

Okay. Houston, 13. How do you read?

Joe Kerwin (CAPCOM)

13, Houston. Loud and clear. What OMNI you on now?

Fred Haise (LMP)

I'm going to stay OMNI B, if you all want to take command back and you can let INCO jockey them around between B and D. And how many steps we got, so I know whether to write big or small here, Joe?

Joe Kerwin (CAPCOM)

Okay. We got steps 6 through 12, but step 7 is the same size as 6, and 8 through 12 are short. They're only one line each.

Joe Kerwin (CAPCOM)

Okay. Step 7 follows: “Circuit breaker panel 11, AC BUS B, HELIUM PQGS PROPELLANT DISPLAY, CLOSED. Circuit breaker 11, AC BUS B, NUMERIC LIGHTING, CLOSED. Circuit breaker 11, AC BUS B, BUS TIE INVERTER 1, CLOSED. Circuit breaker panel 11, EPS INVERTER 1, CLOSED. Circuit breaker panel 16, INSTRUMENTATION SIG SENSOR, CLOSED. INVERTER 1” —

Fred Haise (LMP)

Hold on a minute, Joe.

Fred Haise (LMP)

My shorthand is rather poor today.

Fred Haise (LMP)

Okay I'm now up to circuit breaker panel 11, INVERTER 1, CLOSED.

Joe Kerwin (CAPCOM)

Okay. Next was “Circuit breaker panel 16, INSTRUMENTATION SIG SENSOR, CLOSED. Then INVERTER 1, SELECT. Then HELIUM MONITOR to SUPERCRIT PRESS. Report SUPERCRIT PRESS to MCC.” Over.

Fred Haise (LMP)

Houston, 13. How do you read?

Joe Kerwin (CAPCOM)

13, Houston. You're coming through. We still have some background noise. Do you want to read back step 7?

Fred Haise (LMP)

Okay, Joe. The last thing I got was HELIUM MONITOR to SUPERCRIT PRESSURE.

Joe Kerwin (CAPCOM)

Okay. The last part of step 7 is, “Report SUPERCRIT PRESSURE to MCC,” and read back step 7.

Fred Haise (LMP)

Okay. Step 7. Circuit breaker panel 11, AC BUS B, HELIUM PQGS DISPLAY, CLOSED. Main—Circuit breaker panel 11, AC BUS B, NUMERIC LIGHTING, CLOSED. CD panel 11, AC BUS—Is that AC BUS B? BUS TIE INVERTER 1, CLOSED?

Fred Haise (LMP)

And CB—CB EPS INVERTER 1, panel 11, CLOSED. CB panel 16, INSTRUMENT SIGNAL SENSOR, CLOSED. INVERTER 1, SELECT. HELIUM MONITOR to SUPERCRIT PRESSURE. Report pressure to MSFN.

Joe Kerwin (CAPCOM)

Okay. That's correct. Now step 8 is, “On MCC request, perform step 9.” In other words, you wait for us to decide what to do and that's according to the gouge we've already given you. And step 9, I'll give you now, is “HELIUM MONITOR to OFF, INVERTER to OFF.” Over.

Fred Haise (LMP)

Okay. Step 8 says, “Set in an MCC hold.” Step 9 says, “On MCC' s words, HELIUM MONITOR OFF, INVERTER OFF.”

Joe Kerwin (CAPCOM)

Roger. That's correct. Step 10 is, “Configure circuit breaker panels per Activation 3 and 4.”

Fred Haise (LMP)

Okay. Configure—step 10, “Configure circuit breakers per Activation pages 3 and 4.”

Joe Kerwin (CAPCOM)

Roger. That's correct. Step 11 is, “Deactivate the utility lights if you activated them,” and step 12 which is the last one is, “Transfer to CSM power, usual observations, and report time to MCC.”

Fred Haise (LMP)

Okay. Step 11, “Deactivate utility lights.” 12, “Transfer to CSM power and note the usual observations and report the GET.”

Joe Kerwin (CAPCOM)

Okay. That's it. And, of course, Houston will be requesting you to go to step 9 if the pressure is less than 770. If the pressure is between 770 and 800, we will be asking you to do the following, if you're ready to copy.

Fred Haise (LMP)

Stand by. I've got to find some more blank paper.

Joe Kerwin (CAPCOM)

Yes. This is going to be page TLC-3, but it's very short.

Fred Haise (LMP)

Okay. Go ahead with TLC-3.

Joe Kerwin (CAPCOM)

Okay. Stand by 10 seconds, Fred.

Joe Kerwin (CAPCOM)

Roger. We'll hold off on that. It was a short three-step procedure which said, “Repeat activation pages 1, 1A, and 2,” but there was another step in it that nobody understands. So, essentially what we'd recommend in that case would be that you would repeat the procedure that we just passed up for reading the SUPERCRIT pressure. If we need to, we'll clarify it later on. And that's all we've got.

Jim Lovell (CDR)

Okay. One thing, Joe; I just want to doublecheck again. All the stuff that normally was going to start at 57 hours, which the first item was pressurize CSM to 5.7 psia, we're going to move that up to 64 now, so we have our LM entry which was nominally at 58 at 55. Is that correct?

Jim Lovell (CDR)

Okay.

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Spoken on April 13, 1970, 9:39 p.m. UTC (51 years, 7 months ago). Link to this transcript range is: Tweet

CapCom

Apollo 13, Houston.

CapCom

Roger, 13. Because of the O2 tank 2 quantity sensor drop out, EECOM wants to keep a little closer track of the cryo quantities, and he's going to be asking you to stir all the cryo tanks at slightly more frequent intervals than had been planned, and the first time is now, and we will be calling you probably every 5 or 6 hours, except during sleep period and high activity periods. We'd like you to do it now. Over.

Jim Lovell (CDR)

Okay. We'll start it … now.

CapCom

And, 13, Houston. For your information, a normal 1-minute or so stir will be fine.

Vance Brand (CAPCOM)

Jim, just an advisory; expect a CAUTION AND WARNING on H2 tank 1 pretty quick. No problems; Just warning you about it.

Jim Lovell (CDR)

Okay. A zero pressure light on H2 tank 1 coming on shortly, huh?

Jim Lovell (CDR)

Okay. Well, you're pretty close. It just came on.

Vance Brand (CAPCOM)

Any other predictions you'd like?

Jim Lovell (CDR)

Well, there's—I guess there's all sorts. Could you go to the horse races with me?

Vance Brand (CAPCOM)

I'm sorry; you were garbled. Say again?

Jim Lovell (CDR)

I said I'd like to invite you to the horse races with me.

Vance Brand (CAPCOM)

Right. We'll—We'll send EECOM.