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 from being lowered in flight. == History == In the United States, following three hijackings in 1972, the Federal Aviation Administration ordered that Boeing 727 aircraft be fitted with Cooper vanes.
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 from being lowered in flight. == History == In the United States, following three hijackings in 1972, the Federal Aviation Administration ordered that Boeing 727 aircraft be fitted with Cooper vanes.
Source: Wikipedia "Cooper vane" · CC BY-SA 4.0
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