Discussion
A pylon carries a thrust of \( 100 \) kN applied \( 1.8 \) m below the wing attachment. The pitching moment at the attachment is
Answer: C
Correct answer: 180 kN m
The moment is the force times its perpendicular offset from the attachment:
\[ M = 100 \times 1.8 = 180\ \mathrm{kN\,m} \]
Because the thrust line lies below the wing, the pylon converts a pure forward force into both a force and a substantial nose-up pitching moment at the attachment. The pylon and the wing box local structure must carry it, and it also means that a thrust change produces a pitch change the pilot or autopilot must trim out.
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