What’s “Primary Systems”

[Ref. Pilot’s Handbook of Aeronautical Knowledge, FAA-H-8083-25B Page 7-1]

The primary systems on most GA aircraft include but not limited to:

  1. Engine (engine itself + 6 sub-systems)
  2. propeller
  3. Airframe System
  4. Flight Control System

Note : Flight Control system is added by myself, but I think that is making sense ?!

 

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Additonal systems that might be installed as well as play essential roles in modern airliner:

 

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