Discussion
Which statement about static margin is FALSE?
Answer: D
Correct answer: It increases as the centre of gravity moves aft
The static margin is the distance from the centre of gravity to the neutral point, so moving the centre of gravity aft brings the two closer and the margin decreases.
The other three statements are true: it is expressed as a fraction of the mean aerodynamic chord, it is the standard measure of longitudinal static stability, and a negative value means the centre of gravity has passed the neutral point and the aircraft is unstable. That is exactly why an aft loading limit exists.
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