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An aeroplane is loaded with its centre of gravity close to the aft limit. The crew report very light pitch forces and a tendency for the aeroplane to wander in pitch.

What is the explanation?

  • A.The aeroplane is overweight
  • B.A small static margin gives a weak restoring moment
  • C.The elevator has lost effectiveness
  • D.The tailplane has stalled

Answer: B

Moving the centre of gravity aft reduces the distance to the neutral point and with it the restoring moment. Stick forces fall in proportion, and near the neutral point the aeroplane holds no attitude of its own accord.

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