411 REFERENCE · Wiktionary
Cooper vane
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Etymology
After D. B. Cooper 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
en aviation A mechanical aerodynamic wedge that prevents the ventral airstair of an aircraft from being lowered during flight.
Further reading
en eponyms