Discussion
The pilot of a conventional airplane that is flying steady and level at some altitude, deflects the port side aileron up and the starboard aileron down. The aircraft will then
Answer: B
The aircraft will roll with the starboard wing up.
An aileron deflected down increases the camber, and so the lift, of its part of the wing; one deflected up reduces it. With the starboard aileron down and the port aileron up, the starboard (right) wing gains lift and the port (left) wing loses it. The starboard wing rises and the port wing drops: a roll to port.
The port wing goes down, not up, so 'roll with the port wing up' has the direction reversed. Ailerons deflected in opposite senses produce a rolling moment about the longitudinal axis; pitching nose up or down is the job of the elevator, so neither pitch option applies.
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