Discussion
Assertion (A): A T-tail aeroplane carries a stick pusher.
Reason (R): At very high incidence the tailplane can enter the wing wake and lose effectiveness.
Select the correct answer from the options below.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the second is the hazard the pusher guards against. At very high incidence the wing's separated wake rises and can blanket a fin-mounted tailplane, leaving the elevator without the authority to lower the nose.
Because a developed deep stall may be unrecoverable, certification for such configurations rests on prevention: a stick shaker to warn and a stick pusher to force the nose down automatically before the critical angle is reached, rather than on a recovery technique.
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