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Heading Alignment Cone
in NASA
Heading Alignment Cylinder
in NASA
Heading Alignment Center
in NASA
Heading Alignment Circle
in NASA
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Similar to HAC
AAR - After Action Review
AARL - Aeronautical and Astronautical Research Laboratory
AAV - Air Admittance Valve
AAV - Aerospace Audio- Visual
ABA - Astronaut Boarding Aircraft
ABC - Active Body Control
ABC - Audio Bus Coupler
View all in NASA