ENGINEERING NOTES 473 through initiation of re-entry; and T±, initiation of re-entry through completion of recovery.Let each Ti have associated with it an S i} the event that no serious injury occurs during Tt. The probability associated with each Si is P{Si}. In order to complete a safe mission, it is necessary that all four Si events be completed safely. Each ith event can be completed safely if 1) the nominal activities scheduled for the ith interval are completed, event Sn, or 2) abort is initiated during the ith interval and is completed safely, event >S i2 . That is, P{Si} = P{SnUSi 2 } . Since events Sn and & 2 are mutually exclusive, P{S t ] = P{S.i}+P{S*}.The ability to initiate event Szi is conditional upon completion of event /Sn. The probability that event Si occurs, given that S 3 -occurs, is written P'{&|Sy} and may be calculated 2 from P{S t \S j ] = P{S
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