Discussion
Deliberately weakened attachments that let an engine separate cleanly in a severe overload are _____ pins.
Answer: D
Correct answer: fuse
Fuse pins are deliberately weakened attachments in the engine mount, sized to shear at a load far above anything normal operation produces but below that which would fail the wing structure.
The reasoning is that an engine departing cleanly is survivable, whereas a pylon that stays attached and twists can tear open the wing box and its fuel tanks. In ordinary service the pins are simply structure, carrying the steady thrust and inertia loads with no intended flexibility at all.
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