Cooper vane
English
Etymology
After Dan Cooper, the false name used by an unidentified hijacker who used the rear stairway to exit a Boeing 727 in flight and escape using a parachute.
Noun
Cooper vane (plural Cooper vanes)
- (aviation) A mechanical aerodynamic wedge that prevents the ventral airstair of an aircraft from being lowered during flight.
Further reading
- Cooper vane on Wikipedia.Wikipedia