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 admitted into the budget, and, of course, we must understand by simulation and flight test that the system does perform as estimated. A detailed understanding of situations which lead to anytime launch and subsequent LM rescue and finally the ability of the SPS to perform with no ullage starts at low propellant levels must be understood.

This philosophy results in a 36 lb reserve for the worst case anytime launch (with LM performing docking) with one RCS quad out and with having to do onboard navigation from there on. For the more probable LM rescue contingency associated with on-time launch, the reserve would increase to about 50 pounds or 12% of two good quads.