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Foreign object damage risk is a particular concern for

  • A.Rear-fuselage mounted engines
  • B.Wing-root buried engines
  • C.Overwing mounted engines
  • D.Low-slung underwing pods

Answer: D

Correct answer: Low-slung underwing pods

An underwing pod on a low-wing aircraft sits close to the ground, and its inlet draws hard enough to lift stones, grit and debris from the runway into the engine.

The other positions are all further from the surface: rear-fuselage engines are high and well aft, overwing pods are shielded by the wing itself, and buried wing-root engines take their air from an inlet set well above the ground. Ground clearance is one of the sharpest constraints on low-wing installations, and it grows tighter as bypass ratio rises.

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