Spacelog Apollo 13

Aquarius, Houston. Fred-o, on that—to pass that check, the Sun is at—will subtend an arc of one-half degree in the AOT, so you can be two diameters off and still pass the check. Over.

Okay. It's a half a degree, and so we can be two Sun diameters off and still pass.

That's affirmative. And we want you to maneuver with a DAP of 0.2 of a degree a second. Over.

Okay. You want us to use a DAP of 0.2.

Okay. That DAP load, Fred-o, is 31120. Over.

Okay. 31120.

Roger. Now, if we pass that check, you can just terminate P52 right there, and we'll give you an attitude to go to a burn attitude, and from this we can get a star check. If you don't pass, we'd like you to do an alinement at 75 hours. And, if you're ready to copy, we have some Sun half-unit vectors and some Earth half-unit vectors at 75 hours. Over.

Stand by 1, Charlie.

Okay. Go ahead for 75 hours—Sun and Earth half-unit vectors.

Roger. First with the Sun; for X, plus 45483; for Y, plus 19053; for Zebra, plus 08262; Earth half-unit vector at 75 hours, plus 32120, minus 34155, minus 17370. Over.

Okay. Sun half-unit vectors: R₁ plus 45483, R₂ plus 19053, R₃ plus 08262; Earth half-unit vectors: R₁ plus 32120, R₂ minus 34155, R₃ minus 17370.

Roger, Fred-o. Good readback. Now, on the Earth, we estimate it—if you have to do this alinement, that the Earth will be about a 2-degree Earth. And it'll be approximately three-quarters lighted. Now, to mark on the Earth, we'd like you to take an imaginary line between the horns of the crescent and mark midway between the horns. Over.

Okay. We got a 2-degree Earth that's three-quarter lighted, and we're to imagine a line between the horns of the Earth and mark right in the center of that line.

That's affirmative. Now, on—on this star check—correction, the Sun check, Fred, at—On the 5018, I got some FDAI angles for you if you're ready to copy. Over.

Okay. You're talking about the check at 74 hours GET, right?

Roger. Okay. At 74 hours when you start this maneuver, the 5018 should look like R₁ of 2703 degrees, pitch R₂ is 0903, and R₃ of 2908. Over.

Okay. How about making those all five digit readouts; read them again, Charlie.

Okay. Pardon me. It's 27030, 09030, 29080.

Okay. The 5018 should look like R₁ plus 27030, R₂ plus 09030, R₃ plus 29080.

Roger. That's good readback. Now, we got one more procedure for you; and, right now, we got the rendezvous radar stowed and we won't be able to see anything out of detent 2, so we'd like you to position the radar to 0283; and we have a procedure for that. And we'd like you to do that right before you get the attitude. Over.

Okay. Stand by.

Okay. Go ahead.

Stand by.

Aquarius, Houston. On those 5018 angles we had at 74 hours, Fred, that was based on a VERB 49 to this attitude, and they will be incorrect for the two axis maneuvers, so you can just scratch them. Over.

Okay. You're saying the angles you gave me for the 5018, that was for a VERB 49, so they won't be good for the 5018, and we should scratch them.

That's affirmative. Okay. If you're ready to copy, I've got this rendezvous radar procedure. Over.

Okay. Go ahead.

Okay. It's about a 10-stepper, but real easy. Okay. On CB 16, EPS INVERTER 2, close. CB 11, AC BUS A BUS TIE INVERTER 2, close. Panel 14, verify INVERTER switch 2. CB 11 RENDEZVOUS RADAR 2, close. RENDEZVOUS RADAR, release. RENDEZVOUS RADAR to LGC on panel 3. Are you with me? Over.

Roger. I'm right up with you at step 6. Go ahead.

Okay, Fred. Good show. Step 6: VERB 41 NOUN 72 ENTER, plus all balls, plus 28300. Step 7: Monitor movement with VERB 16 NOUN 72. Step 8: CB 11 RENDEZVOUS RADAR 2, open. Are you with me? Over.

Stand by 1.

Okay. Go ahead now.

Roger. Step 9 is a VERB 44. Step 10: CB 16, EPS INVERTER 2, open. Over.

Okay. I got it.

Okay.

Do you want me to read it back now?

I got one more for you. You'll copy this and give me it all on the readback. Okay. Once you get the attitude and you want to use the—you want to get the AOT lamp, we got to go CB 16 EPS INVERTER 2, close; CB 11, AC BUS A AOT LAMP, close. After the P52, you can open CB 16 EPS INVERTER 2, and open CB 11 AC BUS A AOT LAMP and AC BUS A BUS TIE INVERTER 2. Over.

Okay. Stand by 1.

Okay. Let's see if I got it all. For rendezvous radar parking: first of all we want CB 16 EPS INVERTER 2, closed, CB 11 AC BUS A BUS TIE INVERTER 2, closed. Then on panel 14, verify INVERTER 2 selected. And CB 11 RENDEZVOUS RADAR 2 closed, both breakers. Then we are to pull the RENDEZVOUS RADAR RELEASE handle. On panel 3, we then want RENDEZVOUS RADAR to LGC. A VERB 41 NOUN 72 ENTER with plus all zips, plus 28300 in registers 1 and 2. GO on that. Then we monitor movement with the 16 72. After it gets parked, CB 11 RENDEZVOUS RADAR 2 open, followed by VERB 44 ENTER. And CB 16 EPS INVERTER 2 open. Now, when it comes time for the alinement to get an AOT lamp, CB 16, EPS INVERTER 2 closed, CB 11 AC BUS A AOT LAMP closed, and after the alinement is completed at CB 16, EPS INVERTER 2 open, CB 11 AC BUS A AOT LAMP open, CB 11 AC BUS A BUS TIE INVERTER 2 open.

Good readback, Aquarius. We'll—To get those needles on the VERB 62, we got to power up the commander's FDAI. We'll have that procedure for you shortly. Over.

Okay.

Charlie, Jim here.

Roger. Go ahead.

Have you run a Earth set alinement in the simulator with a docked configuration?

Is the question, “Have we run a—an alinement in the docked configuration?” That is affirmative.

Okay. Did you have any trouble controlling the vehicle, and what techniques did you use?

Briefly, to control pitch and roll, use the TTCA, as we've practiced; for yaw you can use the ACA. Over.

Okay. You have no special techniques going back and forth between the yaw and the X and Y lines. Over.

Not right now, Jim. Dave Scott's been running these things and we'll get them up to you shortly. Over.

Okay.

We think the alinement's going to be okay, so we don't have to do this P52 fullup alinement. We think the check is going to be okay. Like to remind you since you are in ATT—if check does not pass, since you are in attitude for the Sun, that we'd—We want the Sun half-unit vectors first. Over.

Roger. Understand.

Okay, Houston. It's been over an hour since we did our last PTC. You want us to do another one now?

Stand by 1. Over.

Aquarius, Houston. We'd like you to go ahead and yaw 90 for the PTC. Keep a close eye out on your middle gimbal angle. You're about 30 degrees from gimhal lock, and we'll call you an OMNI switch halfway through the maneuver. Over.

Roger.

Okay. And, Houston, Aquarius. You might know when you've had enough ranging so we can get the power amp back off again.

Roger, Fred-o. We got one more procedure, and we can shut it down, and that's to get the needles and the FDAI for this maneuver. That 5018 could take you to gimbal lock, and we think it's a good idea to power up the commander's ball. We've got a four-stepper, if you're ready to copy. Over.

Okay, Go ahead.

Okay. Verify that you got AC power, in other words, the INVERTER 2 selected and the BUS TIE INVERTER 2 AC BUS A closed. We'll be under FLIGHT DISPLAYS, GASTA closed, commander FDAI, closed. On the AC BUS A, CBs GASTA closed, CONBIANDER FDAI closed. Over.

Okay. It's verify we have AC, which is panel 16 INVERTER 2 closed. CB INVERTER 2 closed. Then on panel 11 under FLIGHT DISPLAYS, we want the GASTA and the COMMANDER's FDAI breakers closed. Also under panel 11, AC BUS A GASTA and COMMANDER's FDAI breakers closed.

That's affirmative. Over.

Aquarius, Houston. After the OMNI switch, we would like you to get the ranging off, the VOICE switch to DOWN VOICE BACKUP, and the POWER AMP CB on 16 open. Over.

Okay. After the OMNI switch, we'll get the POWER AMP off and go back to DOWN VOICE BACKUP FTA and the RANGING off. It's your call.

Roger. Stand by.

Fred-o, we got about 2 minutes to the OMNI switch. You can go ahead and power the RANGING down and and the DOWN VOICE BACKUP, and we'll give you a call on OMNI switch. Over.

Okay.

How do you read Aquarius now on DOWN VOICE BACKUP?

Roger, Aquarius. We are reading you about the same, about 2-by.

Okay.

Aquarius, Houston. Select FORWARD OMNI. Over.

…

Do you read down there, Houston?

Apollo 13, Houston. We read you weakly. Go ahead.

Okay. Vance, if Buzz or Neil are around you might ask them if they had to use the AOT lamps to shoot the Sun like they did on 11.

Well, where's the …

Right down below me here?

Fred, breaking in. You're very weak. Understand if Buzz or Neil are down here, you'd like to ask them if they used the AOT lamp to what? Over.

To see the Sun, Vance. It might be possible to see the reticle without even having the light on.

Oh, I see. See if it's possible to see the reticle without the light on. Okay. We'll make a check. And one other thing, you might move that rendezvous radar antenna to park any time now. You can start any time you want.

Okay.

… it's out of the way.

Apollo 13, Houston.

Go ahead, Vance.

Jim, Neil is here. He advises that you will not need the lamp on for the Sun check but that you will need it on for the Earth check. Over.

Understand.

Okay. Let's park the radar. Are you ready?

Okay. Let me—First of all, let me see how we're doing here. That's going down. That's better. That's coming up. That's right. Let's—Okay. Let's park the radar. How—How long is it going to take?

Not too long. Okay, INVERTER 2 … Here, hold the light for me, Jim. Right here on the … panel. Hold it still. … AC BUS A BUS TIE.

Okay.

AC BUS A.

Okay.

BUS TIE INVERTER 2.

BUS TIE INVERTER 2. PRO.

Okay. Panel 16 verify and select INVERTER 2.

Okay.

Okay. On CB 11, give me the RENDEZVOUS RADAR breakers, with 30-second spread.

Okay. … at 15, I …

Okay. … 30 seconds.

Okay. Go ahead.

Right.

Okay. Thirty seconds. AC breaker.

Okay. Got a big dip.

Okay. Reach up here and give me the … panel …

Okay. She's pulled.

Okay. Panel 3, check the LGC.

LGC.

Okay. Give me a VERB 41 NOUN 72.

Still going good, right?

Okay. And they're all zips, 28300.

00.

Go.

… 16 72 …

It's going now. … signal light.

Right.

… is running away. Docking light.

What?

Command module docking light. Okay. You got them. They're in.

Okay. Two RENDEZVOUS RADAR breakers, pull them. … …

…

CB 16 INVERTER 2 open.

Okay.

You know that light on the command module …?

Apollo 13, Houston. Over.

… get that thing …

Roger. One correction. We think that the cheapest way for you to maneuver to change attitude is with minimum pulse ACA. That's to do the star mark.

We had—Okay. As soon as possible we'll get that star data … we can get to maneuver attitude by using TTCA.

Roger.

And, just out of curiosity, we got rid of the radar very nicely. It's hanging right in the middle of the—the forward digit is the docking light on the command module. Can you believe that? I don't think it will hurt our Sun check, but it'll sure make P52 …