What does FCF mean?

• A. Flight Control Function
• B. Final Check Flight
• C. Functional Check Phase
• D. Functional Check Flight

Answer: (D)

Functional Check Flight is the formal post-maintenance flight test that verifies all aircraft systems work together correctly in the actual flight environment. It goes beyond ground checks to confirm control responses, hydraulics, avionics, engine behavior, and mission systems operate as intended across the flight envelope. This step is what gives confidence the aircraft is ready for operational use. The other phrases don’t describe this comprehensive in-flight verification: they may reference individual aspects or different processes, but they’re not the standard term for the complete post-maintenance in-flight check.