Evaluation model of the effectiveness of the countdown-checkout phase of Apollo prelaunch operations

by David S. Stoller, Kathleen Harris

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A study continuing fundamental investigations into evaluation models for countdown-checkout plans. It describes a technique for planning operationally effective space vehicle countdowns and checkouts. The model accounts for such operational factors and objectives as checkout capability, equipment failures, repair activities, and the probability of mission success and meeting a launch window. Results appear in effectiveness measures. Appendixes present a program listing, inputs, and documentation.

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