- Date: Sep 21 1966
- From: FM1/Deputy Chief, Mission Planning and Analysis Division
- Subject: LGC computer requirements to provide DPS backup of SPS
During our discussion at MIT last week, the question came up as to whether it is necessary to have trajectory integration techniques in the LGC for the trans-earth phase of the mission as well as the lunar phase. The argument is that if we are serious about using the LM descent propulsion system to back up the command module SPS during the trans-earth phase, it will be necessary to have this integration capability as a service program for such things as platform alignment and maneuver targeting. In fact, this capability would also be required for trans-lunar aborts using the DPS, I suppose. The more I think about it, the more I am convinced that this capability should be included and I am interested in your comments on the subject. Of course, if you agree I assume you will include it in the 504 LGC program requirements.