Discussion
Centre of gravity limits and what determines each.
| Limit | Set by | Symptom if exceeded |
|---|---|---|
| Forward | Elevator power at low speed | Cannot flare or rotate |
| Aft | Minimum acceptable static margin | Light forces, wandering in pitch |
| Beyond aft | Neutral point reached | Statically unstable |
| Within range | Both satisfied | Normal handling |
Why can an aeroplane be perfectly stable and still be unairworthy?
Answer: C
Correct answer: Stability and control authority are separate requirements
The table sets them out as two independent conditions. Stability is about what the aeroplane does when left alone, and it is preserved by keeping the centre of gravity forward of the aft limit. Control authority is about what the pilot can make it do, and it is preserved by keeping the centre of gravity aft of the forward limit. An aeroplane loaded ahead of the forward limit satisfies the first splendidly and fails the second: it is very stable and cannot be flared. Both must be met, and only the range between the limits meets both.
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