Last Updated
：2025/12/01
Cooper vane
（ plural ）
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(aviation) A mechanical aerodynamic wedge that prevents the ventral airstair of an aircraft from being lowered during flight.
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Cooper vane
The maintenance crew inspected the Cooper vane before takeoff to ensure the ventral airstair could not be lowered in flight.
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The maintenance crew inspected the Cooper vane before takeoff to ensure the ventral airstair could not be lowered in flight.
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