. I got another question on page 18. At 1 minute, I concur with Master Arm, On, but I wonder why I have to have the Abort Stage breaker in. We sure don't want any staging now. [Pause.]
061:24:38 Lousma:
Aquarius, delete the Abort Stage circuit breaker Close. Leave it open.
Throughout this exchange, Fred's intimate knowledge of the Lunar Module, its systems and how they are meant to work is very apparent. Fred was not wrong in his assumption that the abort system should be left unpowered, lest they experienced an accidental separation of the two halves of the Lunar Module - with the loss of their consumables needed for the journey home.
061:24:46 Haise:
Roger. Will delete. [Pause.]
061:24:55 Haise:
Okay. Also, Jack, since we have four-jet ullage versus two, do you want - still want 10 seconds ullage or do you want 5 now? [Pause.]
061:25:09 Lousma:
Okay, Aquarius, we'll use automatic ullage. [Pause.]
061:25:18 Haise:
Okay. We'll just let the 7½-second Auto ullage do it.
061:25:23 Lousma:
Roger, and we'd like to do this in manual throttle, so on page 17 about two-thirds of the way down, Throttle Control, Manual, vice Auto.
Page 17 of the 2-hour checklist shows various procedures to configure the systems for engine firing. Here they modify the plan to use manual throttle instead of having the computer do so automatically.
061:25:35 Haise:
Okay. We're set to Manual. [Long pause.]
061:25:58 Lovell:
What's the 203 [Garbled]?
061:26:05 Lousma:
Enter on the 203, Jim.
061:26:11 Lovell:
We've got 203 in the DSKY now and it looks as though it requires work, can we pass it?
061:26:16 Lousma:
Aquarius, Enter on the 203.
Register value 203 indicates that the engine firing control has been transferred to the PGNS computer.
061:26:22 Lovell:
Wait a minute. [Long pause.]
061:26:51 Lousma:
Aquarius, we'd like to verify that your throttle is in the Min position.
061:26:58 Lovell:
That's affirm.
061:27:00 Lousma:
And, in the event that you have to do a manual takeover, turn the Engine Gimbal Off, Mode Control to Attitude Hold, and use the hand - use the TTCA.
061:27:16 Lovell:
Roger. [Long pause.]
This procedure would lock the engine nozzle so as to prevent the computer from turning it, using Attitude Hold to stabilize the spacecraft, and then use the TTCA hand controller for engine throttling and thrusting.
061:28:14 Haise:
Okay, 1 plus 30 to burn.
061:28:20 Lousma:
Roger. [Long pause.]
061:28:45 Haise:
Okay, Master Arm's On; 1 minute.
061:28:53 Lousma:
Roger, Aquarius. You're Go for the burn. [Long pause.]
Contemporary illustration of the Lunar Module's Descent Engine burning to push the injured Odyssey onto the return trajectory.
061:29:55 Lovell:
40 percent. [Pause.]
061:30:04 Lousma:
Okay, Aquarius. You're looking good. [Long pause.]
061:30:25 Lovell:
Auto shutdown. [Long pause.]
Albeit the throttle control was set to manual, it was the computer that started and stopped the burn during this short maneuver.
061:30:40 Haise:
Okay. You're looking at 16 85 now, Jack.
Verb 16 Noun 85 has been entered on the computer. This displays the velocity components still to be gained. In essence, it displays the difference between the velocity change they wanted and what they got, known as the residuals. With the knowledge of what the residual velocities are, they have a choice whether to leave them as they are or to use their RCS thrusters to bring the values to zero, known as 'nulling the residuals', or trimming.
061:30:46 Lousma:
Okay. You're Go in the residuals, proceed.
061:30:55 Haise:
Okay. When you say Go on the residuals, you mean don't trim them. Is that right?
061:31:00 Lousma:
That's affirmative. No trim required.
061:31:06 Lovell:
Roger.
061:31:08 Haise:
Okay.
Comm break.
061:32:17 Lousma:
Aquarius, check your Master Arm, Off, please. [Long pause.]
061:32:44 Lovell:
Okay, Houston. Burn's complete. Now we have to talk about power-down, and what do you want us to do with the PGNS?
061:32:52 Lousma:
Roger. We're looking at that right now, and you'll be the first one to get the word. [Long pause.]
061:33:19 Lovell:
And, Houston, it's doubtful right now whether we'll be able to see the stars in this configuration. The only way we could possibly get alignment is with the Earth and the terminator or the Moon and its terminator and I'd sure like to have you look at a power-down - keeping the PGNS if at all possible. [Pause.]
Jim wants them to get the LM's power usage down as soon as possible, to save on their precious supplies of battery power and cooling water. He knows that the computer and the IMU are high demand items and will likely need to be turned off, but he is also aware that they might be unable to get proper navigational alignment again if they lose the one they currently have.
061:33:49 Lousma:
Roger, Jim. We'll get the word for you.
Comm break.
061:35:24 Lovell:
And, Houston, we're in an Att Hold mode, can we turn off the buses? [Pause.]
061:35:40 Lousma:
Stand by on that one, Jim.
Long comm break.
061:38:13 Lousma:
Okay, Aquarius. We're working on what's going to happen next. In the meantime, we'd like to take some high-power items off the line, so on panel 11, open DECA Power, and open DECA Gimbal. On 16, open the ATCA breaker. [Pause.]
061:38:36 Haise:
Okay, on 11, we got DECA Power, DECA Gimbal, Open. On 16, we got the ATCA breaker Open. [Long pause.]
To start with a power-down after the burn, they have turned off the DPS control electronics that are not needed anymore, immediately saving about 2 amps.
061:39:37 Lovell:
And, Houston, while you're thinking, see if you can come up with a procedure of perhaps using the Command Module optics with manual drive to perhaps look for stars.
061:39:51 Lousma:
Roger.
Comm break.
The Command Module telescope and sextant are usually electrically operated, but they can be hand cranked into position with one of the tools stowed onboard, if necessary.
061:41:24 Lovell:
And, Jack, Aquarius. While you're thinking - before we had our comm problems, we were wanting to know what to - whether we should hook up the side hatch urine dump system. So we wouldn't freeze up the normal urine dump system.
061:41:45 Lousma:
Roger. We gave you a Go on that earlier. Sorry, you must have missed it. Use the side hatch for urine dump.
061:41:54 Lovell:
Okay.
061:41:56 Lousma:
And, how are the stars out the window now? [Long pause.]
061:42:13 Lovell:
Well, I'll look again, Jack, but at this attitude, the Sun is reflecting off of - off of quad 4 so bright that it's ruining any night vision and we still got particles floating around us; I'll have to take a long look and see if I can see any star patterns.
061:42:34 Lousma:
Roger. [Pause.]
061:42:44 Lousma:
And Aquarius, we're going to have to hand you over to a different site now, and we think maybe things will work better if this time we turn off the S-band Transmitter/receiver, and bring it back up in 5 minutes. You copy?
061:42:59 Lovell:
Okay. Stand by one. [Pause.]
061:43:10 Lovell:
Okay. I understand you want us to turn off the S-band Transmitter/receiver and bring it up in 5 minutes. Is that correct?
061:43:15 Lousma:
That's affirmative.
061: