S&AD means Science and Applications Directorate in NASA
Similar to S&AD
AACB - Aeronautics and Astronautics Coordinating BoardAAD - Attitude Anomaly Detector
AAFE - AeroAssist Flight Experiment
AAFM - Acoustic Atomic Force Microscopy
AAR - After Action Review
AARL - Aeronautical and Astronautical Research Laboratory
AAV - Air Admittance Valve
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