Post-insertion alignment is lower priority than rendezvous navigation
- Date: July 1 1969
- From: PA/Chief, Apollo Data Priority Coordination
- Subject: Post-insertion alignment is lower priority than rendezvous navigation
It has been agreed that it is more important for the LM to obtain rendezvous navigation tracking data than to complete the platform realignment after insertion into orbit if problems occur which prolong it. The point is, an accurate CSI maneuver is vital but it is recognized that bad angle data does not substantially degrade that solution. Thus, even though the lunar surface platform alignment may not be red hot it should be adequate to support the rendezvous navigation; if the crew experiences difficulty in realigning, they should terminate that effort to insure they get an adequate amount of rendezvous radar data. Specifically, they should complete or terminate the P52 by 30 minutes before CSI. If they do fail to complete the alignment, they should add one into their timeline immediately after CSI and depend on the CSM for their plane change targeting.
I would like to emphasize that this is a contingency procedure since everyone anticipates that adequate time has been provided to do this alignment.