Spacelog Apollo 13

Roger. Now stand by 1.

Okay. Hand me the eyepiece. I got Scorpio.

You have?

Yes. And Antares.

Where's the other one? I'll put it back in here.

Hello, Aquarius. Houston. On activation page 16, if you are ready. Over.

Okay. Stand by just 1, Charlie. Jim's going to fish around and see if he's got—he thinks he's got Scorpio. I'm the AOT now. Okay, Charlie, go ahead. I'm on 16 now.

Okay. Fred. On page 16, perform the “Docked DPS BURN (PGNS),” that entire sequence down—down through the end of the page, except cross out that “CSM Maneuver to Burn Attitude, then CMC—FREE.” Over.

Yes. I kind of deduced that one, Charlie. Page 16, “Docked DPS BURN (PGNS),” except we'll forget the CSM maneuver.

Okay. And you can forget the “APS Follow-up,” too. Okay, on page 17, perform all of the AGS entries and at 4 minutes, we got a change. First line, CB(16) INVERTER 3, CLOSE; line 2, scratch out “Select INVERTER 1.” At—proceeding on down the page, after “ATTITUDE MONITOR,” we'd like you to place the RATE SCALE to “25 degrees a second.” Okay, proceeding on down four more lines to “BALANCE COUPLE,” we'd like to turn “BALANCE COUPLE-OFF.” That's to keep the upfiring jets off of the CSM, in case we have to damp any rates in AGS, though we don't think we will. Then perform the rest of that page as written. Over.

Okay, on page 17. Do the AGS load at minus 4 minutes; it's CB(11), INVERTER 2, CLOSE, and scratch “Select INVERTER 1.” RATE SCALE changed to “25 degrees a second.” “BALANCE COUPLE,” we'll turn “OFF;” and, incidentally, on the AGS dampen rates point, it brings up the discussion we'd had before, Charlie, on takeovers. You might discuss what it's going to cost us DELTA-V-wise, if we get a control problem, to just shut her off and it take 30 minutes to regroup for a good manual burn.

Fred, we already got that story for you, pretty well in hand. We're reviewing it right now. And I'd like to defer that question until later on. Basically, we're just going to shut down and take what we got, and we got a midcourse of about—the maximum of 5 foot per second, anywhere in the burn to get back to free return. That—that's basically the story. We'll give you the mission rules for this burn momentarily. I'd like to proceed on to page 18, at minus 1 minute, scratch “MASTER ARM—ON.” Stand by.

Okay, on page 18, and I've already done that at 1 minute; “MASTER ARM—ON,” I'll scratch —

— Slipped that … and I won't have anything to do —

— I've already scratched “CB(16) ABORT STAGE—CLOSE” for the previous burn.

Okay. We want you to close the CB(16) ABORT STAGE. Over.

Okay. You got some special reason for that?

Yes, sir. We like—In case we don't get a manual ON—I mean, an AUTO ON, we're going to back up using the abort stage in the descent-engine command override at ignition plus 1 second. Backing up to page 17, at minus 4 minutes, you read “CB(11) INVERTER 2,” it should be “CB(16) INVERTER 2.” Over.

Okay, I got you, Charlie. 17, “CB(16) INVERTER 2, CLOSE.”

Okay, back to page 18. We'll continue on as is at 30 seconds, 10 seconds, 7 seconds, minus 5 seconds. At “ignition,” no ignition and we'll add here, “no ignition, START pushbutton—push; still no ignition, DESCENT ENGINE COMMAND OVERRIDE, ON.” Over.

I got it out there, but I can't get to see it closer.

Okay, on channel—on page 18, right on down the line, everything holds until after “ignition”; “if no ignition, START pushbutton—push; still no ignition, DESCENT ENGINE COMMAND OVERRIDE switch ON.”

Okay, good readback, Fred-o. At plus 15 seconds, scratch “MASTER ARM—OFF;” and at—proceeding on down to “At Engine Cutoff,” it's—after the “MODE CONTROL: PGNS to ATT HOLD,” we'd like a “VERB 76,” and the “Damp Excessive Rates Via the LM Y, Z Translation.” Over.

Okay, scratch “MASTER ARM—OFF” at plus 15, and “At Engine Cutoff” after “MODE CONTROL: PGNS—ATT HOLD,” we want a “VERB 76 ENTER,” and “Damp Excessive rates Via LM Y, Z translation.” And a question on the—propellant quantity, we expect it to get down below 37 percent on this burn. Does that compare with that burn time when you get down to it.

That's negative. At this—this burn, we're looking at—not reaching 37 percent, so I don't think we'll have to perform that step. We will verify that for you. Okay. One other statement: “At Engine Cutoff, if manual start, then at 30 feet per second to go, throttle to 40 percent. At DELTA-V equals zero, stop pushbutton, push.” Over.

Okay, Charlie. If a manual start, that was throttle to 40 percent at—Was that 30 foot per second to go?

That's affirmative. At 30 foot per second to go.

Okay. Then it's stop pushbutton at VGO equals zero?

That's affirmative. What we want to do, if we got a manual start, we're going to have to shut down manually, and, to get a better guided cut-off at 30 foot per second to go, we want you to throttle at 40 and acceleration is within reason there, and we feel like we can get a good manual cut-off. Over.

Okay.

Okay. Now, Fred, that was good in the checklist. That's all. We'll have the powerdown checklist for you momentarily, and we'd like to ask you if you plan to use the DPS burn card. If you do, we have some changes to that. Over.

Okay. Let me get ahold of this … right now.

Let me know when you are ready to copy. Over.

Roger. Be advised I'm now seeing Antares and Nunki in the AOT, and I just wanted to know whether you want me to try to do a P52.

Roger. Stand by. We copy the stars you are seeing. Stand by on a P52.

Not very far apart. Put the card back up, Jim —

It's better than Antares and Shaula.

Yes. Sure is. That's right.