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Airplane Does a Barrel Roll with Passengers on Board / American Eagle Flight 4184 Loses Control

Black Box Down

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ATR 72 Hinged Moment Reversal - 60 Pounds of Force

Because the ailerons on the a t r 72 are not hydraulically act ted, a pilot would have to manually overcome the rapid increase in force produced by a hinge moment reversal. The safety board concluded that rapid uncommanded rolls and sudden, multiple onsets of even 60 pounds of control wheel force "would and most likely did" preclude the flight crew from effecting a timely recovery.

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