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Regarding the trim position, which of the following statements is correct related to centre of gravity and adjustable stabiliser position?
  • A
    Because characteristic speeds at take off do not vary with centre of gravity location, the need for stabiliser adjustment is dependent on flap position only.
  • B
    At the forward limit for centre of gravity, stabiliser trim is adjusted maximum nose down to obtain maximum elevator authority at take off rotation.
  • C
    A nose heavy aeroplane requires that the stabiliser leading edge is lower than compared with a tail heavy aeroplane.
  • D
    A nose heavy aeroplane requires that the stabiliser leading edge is higher than compared with a tail heavy aeroplane.

Refer to figure.
A tail-heavy airplane (trimmed for nose-down) would require the stabilizer to be deflected up. When the variable incidence tail plane is trimmed, it has no elevator deflection.

The opposite is also true for an airplane trimmed for nose up: it would require the stabilizer to be deflected down. When the variable incidence tail plane is trimmed, it has no elevator deflection. When trimmed for a forward CG position (nose heavy), the stabiliser leading edge is lower than the trailing edge.

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