Spacelog Apollo 13

Okay. DELTA-V_Z in NOUN 81 is minus 02226.

Okay. Good readback.

Somehow that didn't add up with the DELTA-V_X to give a DELTA-V_R of that magnitude. It seems like it'd been bigger.

Okay, Houston. I'm not having too much luck holding this particular attitude.

Okay, Jim. Stand by 1.

Okay, Aquarius. When you get her pretty much in attitude there, and it looks like you're as close as we need to be, we'd like to try a control mode and see if it will work; sort of a semi-PTC. We'll leave the ball powered up for this, and if this doesn't work, why, we'll have to revert to ATTITUDE HOLD mode. But—Stand by 1, please.

We'd like you to think about this control mode, Jim, and see if you think it might work from what you know right now. We're a little skeptical, but we'd like to put it to you. So, once you get in a pretty good attitude, monitor in VERB 16 NOUN 20, go to PGNS MINIMUM IMPULSE, VERB 76, as we have, and set up a yaw rate—yaw rate to the right. Monitor the middle gimbal on R₃ on the DSKY and see if she'll kind of stabilize out. If not, the only other suggestion we've got is to go to PGNS ATTITUDE HOLD. We'll keep the ball up until you make this evaluation.

Okay, Houston. You cut out, say again.

Okay. Where'd you lose me, Jim?

I lost you when you said try the control mode; you're a little skeptical.

Okay. From what you say, we have to be a little skeptical of this procedure, but we'd like to have you try it and have you evaluate it. You can monitor the middle gimbal on R₃. Before we power down the ball, we want your evaluation. The next best choice is PGNS ATTITUDE HOLD. Over.

Okay. I'll try it.

Okay. Go ahead with the control mode procedure.

Hello, Houston; Aquarius.

Go ahead, Aquarius.

Okay. I'm not … you. I can monitor register 3. I can probably keep it out of …—going into gimbal lock.

Roger. How are pitch and roll?

Okay. I think I can control the gimbal angles in 16 20 with the compressors the way they are, but I'll have to try MINIMUM IMPULSE—just a minute.

Okay, Jack. I've a question—one more question about Odyssey.

Go ahead.

Okay, I still have the PYRO A sequence A and PYRO B sequence B circuit breakers in. Do you want those out?

Stand by 1.

Odyssey, Houston. The two circuit breakers you referred to, leave them in.

Okay. Copy. Leave them in.

Okay, Houston. I can control yaw in minimum impulse, but stand by on pitch.

And, Fred-o, the DELTA-V_R resultant computes with the components.

Fred's off the COMM now, Jack.

Roger. Your PAD is good.

And, Jack, we didn't get that whole sentence there.

Okay. I said that the DELTA-V_R that Fred questioned computes well with the component—its rms.

Okay. Copy.

Okay, now. Jack, let's go over this once more. You wanted me to try out control of the spacecraft in the PULSE mode. Is that correct?

That's affirmative. Set up a yaw rate and monitor the middle gimbal angle.

Okay. I can do that. I'm not too sure whether I can control roll or pitch in pulse, but I can control yaw in pulse—yaw in pulse on the ball.

Roger. And remember we're not going to have a ball there, so that we're going to be monitoring CDUs on the DSKY, and if we get it off, it will be pretty hard to figure out where to fly back to; and, well, in addition, have to control the OMNIs while we're doing this.

Roger.

Without the ball, I still have use of the TTCA for control of the—angles.

Affirmative. You'll have the TTCA for pitch and roll.

Okay. I think I can do that without the ball, and if you just give me the TTCAs I think I can control the spacecraft using 16 20.

I'm going to yaw right.

Okay, Jack. I am now—The REGISTER 1 is in the DECREASE mode.

And, Houston, do you see anything wrong with this spacecraft motion?

We have a data drop on right now, Jim; we'll look at it as soon as it comes up.

Okay, Aquarius. We're going to dispense with this control mode. We'd like you to fly the machine back to the original attitude that you had, and we'll go PGNS ATTITUDE HOLD, and then we've got to get that ball off the line to save some power. And then, in order to keep even heating, every 15 or 30 minutes, we'll give you a call to give us 90 or 180 degrees of roll—of yaw.

Okay, Houston; Aquarius. I'm flying it back over towards the initial angles you gave me of a pitch of 257. I'll get near the bellyband in roll and yaw; then I'll go to PGNS ATT HOLD.

That's affirmative, Jim. And then we're going to have you go through a powerdown procedure.

Okay.

Okay. Stand by.

Okay. I'm now in PGNS ATT HOLD. And are you reading my DSKY angles?

Roger. We see them.

Now, you want me to power down the ball, and if you'll give me the procedure for that, I'll do it right away.

Okay. We'll buy what you've got on the DSKY there, and we'd just like to go through an overall powerdown procedure, and in so doing we'll catch the ball and inverter and it will only take a few minutes. So are you ready to start on panel 11?

Roger. Jack will copy, and I'll do the work.

Okay. Panel 11, top row, open all the circuit breakers.

All circuit breakers on top row coming open.

They're all open, top row.

Okay. Second row, close the first six on the left through the ISOL VALVE and open all to the right of that.

Okay. First six on the left are closed—That's through the ISOL VALVE, but I opened up every one from there on.

Okay. Third row, open up the next five—correction—Open up the first five on the left, close AOT HEATER, close SIG CONDITIONER 1. Close ATTITUDE DIRECT, and open the rest on row three.

Do you want ATCA (PGNS) open?

Leave ATCA (PGNS) closed; four breakers on the third row must be closed. AOT HEATER, SIG CONDITIONER 1, and ATCA (PGNS), ATTITUDE DIRECT CONTROL. Our mistake, good going.

Okay. I'm opening up ENGINE START OVERRIDE right now. And that row's taken care of.

Okay. On the fourth row. Open—From the left, open the first five—correction—Close the first five, and open CABIN FAN 1. Close the three GLYCOL PUMP circuit breakers; open all the COMM breakers, except for COMMANDER'S AUDIO; close it. All the PGNS breakers, open—correction—Open the first three PGNS breakers, close LGC/DSKY, IMU STANDBY, IMU OPERATE.

That's complete, Jack.

Okay. And EPS, close BAT FEED TIES, CROSSTIE BAL LOAD, and open the CROSS TIE BUS. Close the next three; open ASCENT ECA CONTROL, ASCENT ECA, and INVERTER 1. Close DC BUS VOLT. Go ahead.

That's complete, Jack. Panel 11 is configured.

Okay. Let's go over to panel 16, top row, and starting from the left—Open the first four.

Stand by, Jack.

Okay. Starting from the left, open the first four.

Okay. And close the ISOL VALVE, keep your TCA breakers closed, close the CROSSFEED, open the next two displays. Close the MAIN SOV and the PROPULSION breakers should all three be open.

Roger. The main valves are closed, and the DISPLAY ENGINE OVERRIDE LOGIC's coming open, and the PQGS and ASC He REG are open.

That's affirmative. The second row: they should all be open except for three breakers under instrumentation. Close SIG SENSOR, PCM/TE, and SIG CONDITIONER 2. Over.

Roger. Do you want SUIT FLOW CONTROL open?

ENGINE ARM coming open and ASA I guess will be open. Is that correct?

We just got a change on that. Let's keep the ASA closed.

How about SUIT FLOW CONTROL and ENGINE ARM?

Okay, Jim. SUIT FLOW CONTROL can be open, and ENGINE ARM—ENGINE ARM open.

Okay. Let's go to row 3.

Okay. Row 3 under COMM. Open DISPLAYS, close SE AUDIO, open VHF A TRANSMITTER and B RECEIVER, close the PRIMARY S-BAND circuit breakers, both of them. Open the S-BAND ANTENNA, PMP closed, TV open, and all the rest of them open under ECS, except CO₂ SENSOR, closed.

Roger.

Okay. Under row 4: under HEATERS, your RCS QUAD heaters should—four of them—be closed, open DISPLAYS, open S-BAND ANTENNA, open SEQUENCE CAMERA. Under EPS, open DISPLAYS, close DC BUS VOLT, open INVERTER 2, open ASCENT ECA CONTROL and ASCENT ECA, close DESCENT ECA, DESCENT ECA CONTROL, TRANSLUNAR BUS TIE, close CROSS TIE BAL LOADS, open CROSS TIE BUS, close BAT FEED TIES. Over.

That's been completed, Jack.

Okay, Jim. And we've already got a change to what we just told you. Under ECS, close the CABIN REPRESS, and insure that the ASA BREAKER is closed under S and C.

The ASA BREAKER is closed, but I closed the CABIN REPRESS.

Okay, Jim. Looks like what we have to do is—In order to maintain even heating, we just have to yaw the whole machine about 90 degrees per hour in increments. So we'll give you a call when it's time to yaw 90 degrees.

Okay. We have to YAW the machine as I understand it, Houston, and you'll give it to me in increments of 90 degrees.

That's affirm.

Okay, Jim. Your present configuration has the following features. We got the electrical BUSES cross tied through the BAL LOAD circuit breakers, and we have AUTO CABIN REPRESS. One thing we'd like to do right now is to give you an uplink, so immediately we have to, on panel 11, close the UPDATA LINK circuit breaker. Go to P00 and DATA. Over.

Houston, Aquarius. Did you say that you had a new pad for us to copy?

Jim, I passed that newest pad that we have to Fred about 30 minutes ago. That's our latest. It's PC plus 2, and it begins with NOUN 33 of 79 hours 27 minutes and 40.13 seconds. You got that one?

Okay. We've got that one. What kind of a ATT HOLD MODE do you want us to do? Do you want us to do WIDE DEADBAND? I didn't … on the DAP.

Jim, the deadband is good the way it is. It's 5 degrees, if you want to stay in it. And stay in the PGNS ATT HOLD mode.

Okay.