weight balanceFAA-published question bank (Private Pilot, 2008)
Loading an airplane to the most aft CG will cause the airplane to be
A
less stable at all speeds.✓ Correct Answer
B
less stable at slow speeds, but more stable at high speeds.
C
less stable at high speeds, but more stable at low speeds.
Explanation
Moving the CG aft reduces longitudinal stability at all speeds, because the tail has a shorter arm and less restoring force; at the extreme the airplane becomes hard to recover from stalls and spins (PHAK Chapters 5 and 10). Stability does not trade between high and low speeds with CG position.
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