scope:

Abstract:

An unintended in-flight mode change impacted a planned Galileo sequence only because of a hardware failure during the sequence. The spacecraft entered safing, necessitating a difficult recovery process that could have impacted science return had it happened during encounter. When simulating and testing command sequences, assure that the software and hardware states exactly match the expected in-flight states. Any anomaly that changes a fundamental spacecraft state must be scrutinized for potential impacts.