There is some concern about the capability of the AGS to safely perform an abort from hover without a PGNCS alignment during the Hohmann transfer. This concern stems from the results of Monte Carlo analyses which indicate that the mean minus three sigma for perilune altitude of an AGS controlled abort from hover is less than 30,000 feet (the safe orbit limit), and from single error analyses which indicate that an initial misalignment slightly larger than three sigma results in an unsafe orbit……
Category: Contingency plans
PGNCS Alignment During Hohmann Transfer
The attached IOC presents an analysis which estimates the increase in the probability of an unsafe AGS abort if the PGNCS alignment during Hohmann transfer is not performed. The analysis shows that given that PGNCS fails, the probability of an unsafe AGS abort from hover is increased by less than 0.001……
“D” RENDEZVOUS MISSION TECHNIQUES OPEN ITEM LIST
July 25, 1968…
Procedure for LM aborts immediately after landing are terrible!
Clarke Hackler of Guidance and Control Division uncovered a rather alarming situation which we’ve discussed a little at our Descent Abort Mission Techniques meetings. He briefly states the problem quite nicely in the attached memo, which I thought should be brought to your attention….
LM propulsion of the LM/CSM configuration as an SPS backup technique
The question of using LM propulsion in a LM/CSM configuration has recently been the subject of detailed review. Control system studies, both inhouse and at GAEC, have contributed to that review. Because of the current interest in the LM propelled docked configuration and its guidance and control systems, a review of the studies performed in support of the system development effort has been made. The present memorandum is intended to summarize the results of those studies….
Procedures needed for the AS-503 TLI maneuver
This note is to back up our telephone conversation (2/5/67) in which I requested you to prepare our recommendation as to how the AGC should be used during the simulated translunar injection maneuver on AS-503. It’s certain the crew will want to monitor the progress of this large SIVB maneuver, even though it’s controlled by…
C’ Communication Loss
A lot of work is going into the subject contingency – with respect to:…
Spacecraft computer program – things dealing with lunar descent and aborts from it
I spent an interesting morning at MIT on May 16 with George Cherry, Dan Lickly, Norm Sears, and Craig Schulenberg talking about Luminary how it works and some things that really haven’t been defined yet. It primarily dealt with lunar descent and aborts from lunar descent….