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Heading Alignment Cone
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Heading Alignment Cylinder
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Heading Alignment Center
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Heading Alignment Circle
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Similar to HAC
AC - Assembly Complete
ACBM - Active Common Berthing Mechanism
ACC - Aft Cargo Carrier
ACCA - Automatic Cloud Cover Assessment
ACCMS - Advanced Checkout, Control, and Maintenance System
ACCS - Advanced Checkout and Control System
ACE - Advanced Composition Explorer
View all in NASA