Spacelog Apollo 13

Okay. We PRO on—after entering the 200. We'll get a flashing 0688. We then load the Sun unit vectors for 74 hours, which are R₁ plus 5—correction, plus 45498, R₂ plus 19024, R₃ plus 08250.

Roger. That's good, Fred-o. And that'll bring you to step 8, and you get a flashing 5018 when you PRO on the NOUN 88. Okay. At 5018, we want to do an AUTO maneuver to—to the attitude, so just do the—the PRO with the GUIDANCE CONTROL, PNGS; MODE CONTROL, PNGS, AUTO; and we'll take this attitude. Now, that's going to put us at—at attitude for the Sun check. Now, we're being a 1.4-degree deadband in this program in a docked configuration; so, to help you out, you could call VERB 62 to get your needles—and it—when the needles go through zero or null out and—in that deadband—then you take a look in the AOT and see how close the Sun is. And we want within plus or minus 1 degree. Over.

Okay. So we PRO on the NOUN 88, and we end up with a flashing 5018; and you want an AUTO maneuver here rather than using the TTCA, so we PRO with GUIDANCE, PNGS; MODE CONTROL, AUTO. We've got a 1.4-degree deadband with a VERB 62 will give us the needles to try to zero them in and, at that time I look through the AOT and, if it's like Apollo 11 Sun check, all we've got to have is the Sun somewhere in the—out there somewhere on the Sun as it passes. Is that correct?

I think that's a little tight; that's about a quarter degree. We can go a little bit out of that. Stand by 1. Fred, we'll get you an answer on that one. And also, if you'll stand by, we'll give you a DAP load for this maneuver. Over.

Okay. We'll—You'll give us a DAP load.

Roger. Stand by.

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. 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.