Reference is made to MSC memorandum 67-FM-T-52, “Spacecraft computer program status – particularly Sundisk,” dated August 1, 1967….
Month: August 1967
Head-up and locked DAP-wise
Bob, it looks like I’ve had my head up and locked for the last year or so along with a few of my cronies over here, because we sure did misunderstand the division of responsibilities. And I am sorry about that because I am sure it must have contributed substantially to our problems….
Use of DPS for lunar mission aborts
The other day Carl Huss and some of the flight Analysis Branch people gave an internal briefing on Apollo aborting procedures for the lunar landing mission starting with the translunar injection (TLI) maneuver. One thing that impressed me was the large number of situations in which dependence is given to using the Descent Propulsion System…
Reentry guidance is perfect for S/C 101 regardless of L/D
This memorandum is in response to your question regarding the reentry guidance with low L/D. It was erroneously reported to you in the August 3 MPAD Weekly Activity Report that, although the program could be modified easily to handle L/D as low as 0.2, it probably would not be implemented for Spacecraft 101. Actually, some…
Does the landing radar mess up?
This memorandum is to request that you look further into the business of how the use of landing radar observations in the spacecraft computer during descent influences the onboard determination of the final landing point. Hopefully, the landing point is essentially fixed prior to processing of the landing radar data but that may not be…
Delete DOI thrust program, P-61
This is a reminder of the action item you picked up at the lunar landing GSOP review August 17. It was our desire, you recall, to delete the DOI prethrust/thrust program, P-61. It seemed at that time that it should be possible to make this small maneuver using the external Δ V targeting from the…
Prelaunch DAP initialization
During our review of the lunar landing GSOP’s, the question of prelaunch DAP initialization was brought up. As far as I can see, there is no use for the DAP until after TLI, isn’t that right? For example, the contingency orbit insertion maneuver does not use the DAP nor does CSM guidance of the S-IVB….
Goodies affecting the RTCC gleaned from the 504 GSOP meeting
I am writing this memorandum to you in your position as RTCC program coordinator for MPAD. During the lunar landing GSOP review of August 16 and 17, I noted a number of items discussed which had some bearing on the RTCC program. I would sure appreciate it if you would look them over and see…
Analysis of LM rendezvous navigation is needed
This memorandum is just a reminder for a couple of action items I discussed with you coming from the lunar landing GSOP review August 17. I think it is very important that you really get on with analyzing the performance of the rendezvous navigation in the LM using the radar. Two items you should specifically…
Is display of max g in P-61 any good?
During our lunar landing GSOP review someone commented that the display of max g in P-61 is of no use at all. It was said to be grossly in error for earth orbit reentry and of no value in determining appropriate action during entry from lunar return or following an abort when it is more…