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A twin-engine, class B aeroplane is flying straight and level when it loses one engine. Complete the following sentence:

The Thrust Required will (1)_____ and the Excess Thrust will (2)_____.

  • A
    (1) Decrease by 50%; (2) Decrease by more than 50%.
  • B
    (1) Increase; (2) Decrease by more than 50%.
  • C
    (1) Increase; (2) Increase by more than 50%.
  • D
    (1) Increase; (2) Decrease by 50%.

Provided that both engines produce the same amount of thrust, the thrust available will be reduced by 50% after an engine failure.

Following an engine failure, there will be drag from the windmilling blades. Drag will also be increased because the rudder will be applied to keep the aircraft straight. Consequently, the excess of thrust over drag will be reduced by more than 50%.

Note: Thrust required equals drag.

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