Definition
A qualified crew member responsible for monitoring and managing an aircraft's mechanical, electrical, fuel, hydraulic, pressurization, and engine systems during flight, working alongside the pilots on aircraft certified to require a third crew position.
Plain English
A specialist crew member who looks after the aircraft's systems in flight, freeing the pilots to focus on flying. Found on older or larger aircraft that need a third person on the flight deck.
Context Anchor
Seen in aircraft crew references, older transport aircraft procedures, and checklists that assign specific duties to the FE.
Derivation
From 'flight' (the act of flying) and 'engineer' (a person trained to operate and maintain machinery). The role developed when piston and early jet airliners had so many systems to monitor that pilots needed a dedicated systems specialist on board.
Why Pilots Care
On aircraft certified for a flight engineer, the position is required by the type certificate and the operating regulations. Most modern airliners no longer carry one because automation has absorbed the role, but pilots may still encounter the position in legacy aircraft, freighters, and certain military types.
Intuition Check
A flight engineer is not the same as an aircraft mechanic or a person who designs airplanes. In this context, the FE is an operating crew member in the cockpit.
Example Sentence 1
The Boeing 727 was operated with a captain, first officer, and flight engineer on the flight deck.
Example Sentence 2
Older three-crew airliners required a flight engineer to handle systems tasks in flight.