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Airplane Crashes Upside Down on Runway / Propair Flight 420 Loses a Wing

Black Box Down

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Is the Parking Brake Really Used?

Pilots often use wheel chalks instead of parking brakes. Wheel chocks were actually used while the engines were started on the day of this accident. It couldn't be determined whether the crew used the parking brake between engine start and takeoff. Tests conducted to demonstrate that the valves would center in this manner did not result in the valve centering.

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