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Ken Mattingly
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That's correct. Now we want to perform the CMC powerup per the CSM G&C checklist, G 2-2.
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Ken Mattingly
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That's correct. Perform the EMS check, step 32 of the entry book, page 1-4.
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Ken Mattingly
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That's correct. Okay, now the ground is going to give you a P27 update, at EI minus 2 plus 15. That's a—that's a time that you need to be configured to accept up telemetry. And what they're going to give you on a P27 update will by a clock increment, a state vector; they'll give you a VERB 66; they'll give you two REFSMMATs, there'll be an actual and a preferred; and the entry target load. Now, if you'd like. to copy those, I can take it a little slower.
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Jack Swigert (CMP)
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No, I've got them. They are going to give me a clock DELTA, state vector, VERB 66, two REFSMMATs, and an entry target load.
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Ken Mattingly
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No, not very much. How about IMU powerup according to the G&C checklist, G/2-1.
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Ken Mattingly
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That's correct. And the next thing you will do will be to set the mission timer and what we've done is to only turn on the mission timer on the MDC. And you'll probably have to wait here until they get through with the uplink so you can have the computer.
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Ken Mattingly
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That's affirm. Okay. Now, we are getting ready to start the alinement sequence, and are you familiar with the general sequence of events we're going to use, Jack?
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Jack Swigert (CMP)
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How do you mean? We are going to make an alinement on the Moon and on the Sun; other than that—I didn't get any—I wasn't on the headset when the general information was passed up, so if there was any more than that, I didn't get it.
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Ken Mattingly
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Okay. Basically, that is correct. Let me just run through it hand-waving-type for a minute, and then I'll read you the steps. I think it will make more sense. The scheme is that the LM can fly to a set of ball angles that will point your optics at the Moon. Now, at any time, in any attitude that we happen to be at, if you can look in the telescope and recognize star patterns sufficient that you believe you can make an alinement all on your own, that's the place we'd like to break off and let you go ahead and take over with your own alinement. However, we are giving you a procedure which will give you things we know you can see in the telescope without worrying about any reflections or anything of that nature, and it's not intended that this procedure has to be followed past the point where you know you've got good definition of star patterns in your telescope. If you need to go on, we'll maneuver, take a look at the Moon, we'll take a mark there, and then we'll maneuver with the LM/FDAI angles again and take a look at the Sun, and get yourself another mark on the Sun and that will complete the alinement. Now, the alinement scheme is that we are going to give you a set of angles that you can coarse aline the ball through when the LM is pointing you at the Moon. Now, this set of angles will agree with the REFSMMAT that you have in as a nominal REFSMMAT in you CMC. You can coarse aline to that, set a drift flag and REFSMMAT flag, and you'll have a good platform and we'll be within a couple of degrees of a good alinement. And, if we have to, we could break off at this point and go ahead with an entry; however, in an attempt to get a good platform, we are going to have you then do a P52 option 1, and what you are going to find in the option 1 slots is the entry REFSMMAT. You'll come up with the NOUN 22 values, and we intend to go ahead and coarse aline the ball to the entry REFSMMAT attitude, and then we'll go ahead and take marks through a normal P52 sequence. So that's the general scheme that we are going to use. If you think you have a handle on that, I will go ahead and read you the steps.
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Jack Swigert (CMP)
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Okay. Well, let me ask a question. The LM maneuvers to a set of Moon-viewing angles. Okay, at this time, I am going to do a P52, is that right? With the planet option?
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Ken Mattingly
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The first thing we are going to do is to coarse aline the platform and get it inertial, based on the REFSMMAT that you have in the present slot inside the CMC. We'll then go—and do a P52, option 4—Correction, option 1.
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Jack Swigert (CMP)
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Okay—That's after the LM gets established at the attitude. Jim says I'm here at the Moon-viewing attitude, I do a VERB 41 NOUN 20 to the set of angles that you're going to give me in the pad.
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Ken Mattingly
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The P52 will be done as an option 1. The only reason you have the other REFSMMAT inside the computer is that in order to set the REFSMMAT flag, you need some relative orientation.
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Jack Swigert (CMP)
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Okay. I see. I do a P52 option 1, and when do I set the REFSMMAT flag and the drift flag?
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Jack Swigert (CMP)
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Okay. All right. Let's go at it. Maybe it'll all fall out and I won't have any questions. Go ahead.
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Jack Swigert (CMP)
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Okay. When the LM is in the Moon-viewing attitude, I do a VERB 41 NOUN 20, ENTER.
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Ken Mattingly
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That's right. And you'll put in the attitudes that you'll get from one of the pads, and this will be for the coarse aline angles when the LM is at the Moon-viewing attitude. Then when they're all squared away, I tell you they have the right attitude; we then pick up again with a VERB 40 NOUN 20, ENTER.
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Jack Swigert (CMP)
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Okay. VERB 40 NOUN 20, ENTER when Moon is—the LM is satisfied that they're at the Moon-viewing attitude.
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Ken Mattingly
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That's correct. Now we're going to set the REFSMMAT and drift flags according to the G&C checklist, page G/7-1, steps 3 and 4.
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Ken Mattingly
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That's affirmative. Okay. When that's complete, the LM will maneuver to the Sun-viewing angle for attitude. And when they get there, you take a mark on the Sun using the Sun filter and the telescope; and, again, we're marking on the center.
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Jack Swigert (CMP)
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Okay. Now, let me ask you a question. Is the first mark on the Moon made with the—are all these made with the telescope and not the sextant?
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Ken Mattingly
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If—I'm not sure right offhand what the angular size of the Moon is, Jack. If you can get it in the sextant; that's the best thing to do, but you may have to go into the telescope in order to define the center. Either one's acceptable.
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Jack Swigert (CMP)
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Okay. If I can define the center through the sextant, do it that way. And if I can't, use the telescope.
Spoken on April 17, 1970, 2:09 a.m. UTC (54 years, 6 months ago). Link to this transcript range is: Tweet
