Discussion
An aeroplane loaded well forward is stable and pleasant in the cruise, but on approach the pilot finds full aft elevator barely sufficient to flare.
What limit has been reached?
Answer: C
Correct answer: The forward centre of gravity limit, set by elevator power
Loading forward gives a large static margin, which is why the cruise felt solid, but it also increases the nose-down moment the elevator must overcome. On the approach the speed is low, so the dynamic pressure at the tail and the moment per degree of elevator are at their smallest. The two effects meet, and full aft elevator barely produces enough moment to flare. This is precisely the condition the forward limit exists to prevent, and it shows that the limit is about control authority, not about stability.
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