If an aircraft is trimmed with elevator deflection \delta_e = 0 at cruise speed, deflecting the elevator trailing-edge upward (\delta_e < 0) causes:

(A) A positive (nose-up) pitching moment increment

(B) A negative (nose-down) pitching moment increment

(C) Zero change in pitch trim

(D) Pure rudder deflection

Answer Key:

A

### Solution: Elevator trailing-edge upward reduces horizontal tail lift (creates negative tail lift), which produces a positive (nose-up) pitching moment about the CG: \Delta C_m = C_{m\delta_e} \delta_e > 0 because C_{m\delta_e} < 0. Correct: A.

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