Discussion
The condition in which the wing wake blankets a high-mounted tailplane, leaving the elevator powerless, is called _____.
Answer: D
Correct answer: deep stall
Deep stall is the condition in which the wing's separated wake rises at extreme angle of attack and blankets a high-mounted tailplane, so the elevator has no clean air to work in and cannot lower the nose.
It is self-sustaining, the aircraft descending at high incidence with the wake still over the tail, and recovery may be impossible - which is why the treatment is prevention by stick shaker and pusher. Flutter is an aeroelastic instability, buffet is separated-flow vibration, and Dutch roll is a lateral-directional oscillation.
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