Discussion
Nacelle fan cowls are hinged rather than bolted primarily to
Answer: D
Correct answer: Give rapid access for line maintenance
Fan cowls are hinged at the top so that they swing open like a pair of doors, exposing the accessory gearbox, the pumps, the generator and the plumbing within a minute or two and with no loose fasteners to drop into the engine.
Turnround time is money, and a large proportion of line maintenance is done through these panels. Hinges add weight and a slight aerodynamic penalty compared with a flush bolted panel, so the arrangement is chosen for access despite those costs, not because of them.
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