Discussion
Which of the following would NOT help fit a larger fan under an existing low wing?
Answer: D
Correct answer: Raising the tyre inflation pressure
Higher tyre pressure reduces deflection under load by a small amount, but the gain is a centimetre or two at best - nowhere near the fifteen centimetres a larger fan typically costs - and it worsens the ride and the runway loading.
The other three are the measures actually used: lengthening the undercarriage raises the whole aircraft, flattening the nacelle bottom removes depth where the clearance is critical, and repositioning the accessory gearbox from beneath the core to the side allows a more circular, shallower nacelle.
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