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High Efficiency Particle Accumulator
in NASA
High Efficiency Particle Air Filter
in NASA
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Similar to HEPA
AA - Astronomical Applications
AA - Adverse Action
AA - Antenna Assembly
AAA - Avionics Air Assembly
AAC - Aft Access Closure
AACB - Aeronautics and Astronautics Coordinating Board
AAD - Attitude Anomaly Detector
View all in NASA