Discussion
Assertion (A): Large transports almost invariably use underwing podded engines.
Reason (R): The engine mass outboard relieves wing bending and the pod is easy to access and change.
Select the correct answer from the options below.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both statements are true and the reason gives the two decisive advantages. The engine mass hanging outboard acts downward against the wing's upward bending in flight, allowing a lighter structure - and the relief grows with load factor, so it is greatest where the structure is most critical.
A pod hanging clear beneath the wing is also far easier to inspect, access and change than a buried or rear-mounted installation. Together these outweigh the larger engine-out yawing moment the position imposes.
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