Discussion
The aft centre of gravity limit of an aeroplane is set by
Answer: D
Correct answer: The minimum acceptable static margin
As the centre of gravity moves aft the static margin shrinks, the moment slope flattens, and the stick forces lighten until the aeroplane wanders in pitch. The neutral point is where the margin reaches zero, and the certificated aft limit is placed some way forward of it to keep a positive margin at every loading. It is a stability limit, in contrast with the forward limit, which is a control-authority limit set by the elevator power available at low speed.
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