Frank Borman (CDR)

Say again, please. Go ahead. We are 130—Will you say again, please?

Ken Mattingly (CAPCOM)

Wilco, Apollo 8. First, if you can spare, we would like to have the high gain to complete the dump.

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Spoken on Dec. 25, 1968, 3:12 a.m. UTC (50 years, 11 months ago). Link to this transcript range is: Tweet

Frank Borman (CDR)

Stand by. We will try to get it for you.

Frank Borman (CDR)

In a couple of minutes there, Houston.

Ken Mattingly (CAPCOM)

Okay, Apollo 8. While we are —

Ken Mattingly (CAPCOM)

Apollo 8, while we are waiting for the high gain, I will continue the trajectory summary. We can still get back to the mid-Pacific line in 146 hours from the thirteenth REV, and you are on your way after 138 seconds of the burn. That's 138 seconds, gets you clear of the butterfly region. We recommend not trying preignitions or restarts after 20 seconds. If you go beyond 20 seconds, this may get the trajectory beyond the correction—RCS correction capability to a free return. The weather in recovery area is good. We have an AOS following TEI of 89 plus 28 plus 39 and an AOS without TEI of 89 plus 37 plus 24. During the burn, you may notice a slight change in chamber pressure and tank pressures due to the fuel exhaustion in the storage tank and going to the sump tank. This may occur somewhere around 2 to 5 seconds into the burn. It'll be a small change in pressures in both systems. Going down the systems, all systems are GO. In ECS, we want to stop water boiling after TEI for trajectory purposes. Your water dump situation looks good; you should be good to greater than 105 hours. We'll try to hold off the water dump until after MCC 5. In the EPS, we'd like to stir the cryos prior to TLI—correction TEI. The next purge on the fuel cells will occur at approximately 92 hours, and that will be both hydrogen and oxygen. Your battery status: battery A 34.9, battery B 39.1, and Charlie 38.5. We have the single tank cryo capability. SPS: looking at the performance on the previous burns, you can anticipate a normal burn taking approximately 3.7 seconds in excess of the computed values. Engine performance looks nominal, and all parameters have been steady. RCS looks good; all four quads according to the computer programs have approximately the same capacity. You have a good REFSMMAT to take you through TEI. We'll have a post TEI PTC attitude for you in a few minutes. and that just about wraps up what we have on systems. Over.

Frank Borman (CDR)

Roger. Thank you, Houston. We appreciate the summary. We're trying to get high gain.

Frank Borman (CDR)

You do have the high gain. Now, Ken, as I understand it, if it shuts down after 20 seconds of burn, you don't want us to try to re-light it. Is that what you said?

Ken Mattingly (CAPCOM)

Apollo 8, the intent was do not delay ignitions beyond 20 seconds. Over.

Frank Borman (CDR)

Oh, do not delay ignition beyond 20 seconds Roger.

Frank Borman (CDR)

Okay. You want me to start it on tank A and then switch to B again like we did on our LOI, right?

Frank Borman (CDR)

Did you put in this PAD for us? Should P30 and 40 be in our computer now?

Ken Mattingly (CAPCOM)

Apollo 8, that's negative. We had not uplinked this PAD. We'll put this one in on the next pass.

Ken Mattingly (CAPCOM)

Apollo 8, Houston. You have a GO for this REV.

Ken Mattingly (CAPCOM)

Apollo 8, Houston. We have completed the tape dump, and the recorder is yours.

Bill Anders (LMP)

Houston, how do you read? Apollo 8 on OMNI C.

Ken Mattingly (CAPCOM)

Apollo 8, Houston. We're 5 minutes to LOS; we'll have AOS Honeysuckle at 87:38:42.

Ken Mattingly (CAPCOM)

Apollo 8, everything looks good going over the hill.

Frank Borman (CDR)

Roger, Ken. Thanks a lot. We'll see you around the next pass. Just have our TEI update for us when you're ready. Okay?

Ken Mattingly (CAPCOM)

Loud and clear, Apollo 8.

Frank Borman (CDR)

Okay. You want the computer?

Ken Mattingly (CAPCOM)

Apollo 8, we would like to have the high gain, and when we get that, well, we will start a dump, and we will start your updates.

Frank Borman (CDR)

Okay. How about reading us the PAD, and we will try to get you the high gain.

Frank Borman (CDR)

Ken, read us off the PAD in case you can't get the dump in; we can still do it.

Ken Mattingly (CAPCOM)

Roger. I have got them right here.

Ken Mattingly (CAPCOM)

Okay, Apollo 8. The first PAD I have is TEI 10.

Ken Mattingly (CAPCOM)

Alright. TEI 10, SPS/G&N: 45597, minus 040, plus 157 089:19:15.67, plus 35186, minus 01512, minus 00520 180 007 000, November Alfa, plus 00186 35223 318 35018 42 0924 253; Scorpii Delta, down 069, left 45, plus 0748, minus 16500 12994 36300 146:50:05; primary star Sirius, secondary Rigel, 129 155 010; four quads, 15 seconds, ullage; horizon on 3.2-degree window line at T minus 3; use high-speed procedure with minus Mike Alfa. Over.

Frank Borman (CDR)

You got the high gain now, Ken.

Jim Lovell (CMP)

Houston, Apollo 8. How do you read?