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- Cooper_vane abstract "A Cooper vane (also sometimes called a "Dan Cooper switch" or "D.B. Cooper device") is a mechanical aerodynamic wedge that prevents the ventral airstair of an aircraft being lowered in flight. In the United States, following three hijackings in 1972, the Federal Aviation Administration ordered that Boeing 727 aircraft be fitted with Cooper vanes. The device was named for famed airplane hijacker D. B. Cooper, who used the rear stairway to exit a Boeing 727 in flight and make his escape via parachute.The Cooper vane is a very simple device consisting of a spring-loaded paddle connected to a plate. When the aircraft is on the ramp, the spring keeps the paddle perpendicular to the fuselage, and the attached plate does not block the stairway. As the aircraft takes off, the airflow pushes the paddle parallel to the fuselage and the plate is moved underneath the stairway, preventing it being lowered. Once the airflow decreases on landing, the spring-loaded paddle returns to its initial position, thereby allowing the stairs to be lowered again. Although this device was intended to prevent hijackings aboard the 727 and other aircraft with a ventral airstair, many airlines sealed the airstair entirely, never to use it again.Douglas DC 9 aircraft with ventral stairs were also equipped with Cooper vanes. The DC 9-21 used for skydiving at the 2006 World Free Fall Convention in Rantoul, Illinois had one installed, but since the rear pressure bulkhead door and the stairs had been removed to facilitate fast jumper exits, the vane, which was left in place, did not prevent jumps.".
- Cooper_vane thumbnail 727db.gif?width=300.
- Cooper_vane wikiPageID "1012000".
- Cooper_vane wikiPageRevisionID "602576874".
- Cooper_vane hasPhotoCollection Cooper_vane.
- Cooper_vane subject Category:Aircraft_doors.
- Cooper_vane subject Category:Locks.
- Cooper_vane type AircraftDoors.
- Cooper_vane type Artifact100021939.
- Cooper_vane type Barrier102796623.
- Cooper_vane type Door103221720.
- Cooper_vane type MovableBarrier103795580.
- Cooper_vane type Object100002684.
- Cooper_vane type Obstruction103839993.
- Cooper_vane type PhysicalEntity100001930.
- Cooper_vane type Structure104341686.
- Cooper_vane type Whole100003553.
- Cooper_vane type YagoGeoEntity.
- Cooper_vane type YagoPermanentlyLocatedEntity.
- Cooper_vane comment "A Cooper vane (also sometimes called a "Dan Cooper switch" or "D.B. Cooper device") is a mechanical aerodynamic wedge that prevents the ventral airstair of an aircraft being lowered in flight. In the United States, following three hijackings in 1972, the Federal Aviation Administration ordered that Boeing 727 aircraft be fitted with Cooper vanes. The device was named for famed airplane hijacker D. B.".
- Cooper_vane label "Cooper vane".
- Cooper_vane label "Cooper vane".
- Cooper_vane sameAs Cooper_vane.
- Cooper_vane sameAs m.03z2l8.
- Cooper_vane sameAs Q5167849.
- Cooper_vane sameAs Q5167849.
- Cooper_vane sameAs Cooper_vane.
- Cooper_vane wasDerivedFrom Cooper_vane?oldid=602576874.
- Cooper_vane depiction 727db.gif.
- Cooper_vane isPrimaryTopicOf Cooper_vane.
