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Pounds per Square Inch lb/in2 preferred
in NASA
Power Static Inverter
in NASA
129340129339
Similar to PSI
AA - Adverse Action
AA - Antenna Assembly
AAA - Avionics Air Assembly
AAC - Aft Access Closure
AACB - Aeronautics and Astronautics Coordinating Board
AAD - Attitude Anomaly Detector
AAFE - AeroAssist Flight Experiment
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