On March 21 a small group of us ???? ??????? the logical flow charts TRW produced based on our ??? Lunar Reentry Mission Techniques meeting a couple of weeks ago. A couple of things came up that I should probably pass around….
Category: Transearth coast
C’ maneuvers – SPS versus RCS crossover
Neil Townsend (EP2) informed me by phone – and will supply written confirmation – that the minimum duration SPS burn for C’ should be no less than 0.5 seconds. We had been assuming something smaller. According to MPAD (Otis Graf, FM7) this makes the crossover point between use of the RCS versus the SPS engine:…
F and G cis-lunar midcourse correction scheduling
This memo is to make sure everyone is aware that we are scheduling the final midcourse corrections before LOS and Entry differently than on C’….
Is MSFN ranging mandatory for C’?
During our C’ Data Select Mission Techniques meeting a question came up which must be understood and answered prior to the flight. It involves the requirement for being able to obtain MSFN range information during the cis-lunar phase of the mission. It has been said unofficially that ranging is essential to do a decent job…
Let’s have no unscheduled water dumps on the F mission
During a recent Data Selection Missions Technique meeting we were informed that the CSM has some sort of automatic water dump system. It was even rumored that it might be enabled on the F mission while the crew is sleeping during cis-lunar flight. The memo is to inform everyone than an unscheduled water dump can…
F/G Mission Techniques – except for the lunar orbit phase – are ready to eat
Some of the decisions and open items that came out of our F/G Mission Techniques meetings in late January are listed in this memo. Basically, I would say that all mission phases aside from the lunar orbit activity are very well understood at this time – primarily as a result of the C’ mission -…
Operations required for communication loss on F and G are sure better than on C’
I think we have pretty well established how to handle a communication loss situation on the F and G missions. In effect, we have defined which Block data must be sent and what onboard cis-lunar navigation needs to be carried out. In both cases, of course, it is possible to cut back substantially from the…
Cis-lunar spacecraft navigation for C’
We are still thrashing around trying to figure out what to do with regard to cis-lunar spacecraft navigation for the C’ mission. It is not clear whether a couple of things are really necessary or not. If we could get rid of them, it would simplify things. Unfortunately, we aren’t confident it is safe to…
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….
C’ Mission Techniques clean up – Translunar and Transearth
On November 8 we went over the Translunar and Transearth phases of the C’ Mission Techniques – pretty well cleaning all this up, I think. The following paragraphs describe the more significant decisions and agreements reached. They deal with block data, onboard navigation, and returnto-earth with no communications….