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For a given elevator deflection, aeroplane longitudinal manoeuvrability increases when…

  • A
    flaps are retracted at constant IAS.
  • B
    the CG moves aft.
  • C
    IAS decreases.
  • D
    the CG moves forward.

Aircraft longitudinal stability is directly related to Centre of Gravity (CG) position. A high degree of stability translates into decreased manoeuvrability.

  • A forward movement of the CG position increases the longitudinal static stability, the stick-force stability and decreases the manoeuvrability.
  • An aft movement of the CG position decreases the longitudinal static stability, the stick-foce stability and increases manoeuvrability.

Maneuverability refers to the airplane's overall sensitivity to control inputs from the pilot and the effectiveness of the control surfaces over their control range.

Forward CG⇒increased longitudinal stabilityreduced maneuverability
Aft CG⇒decreased longitudinal stabilityincreased maneuverability

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