Discussion
Assertion (A): Aluminium alloy remains a common airframe material despite composites being lighter.
Reason (R): Aluminium is cheaper to form, join, inspect and repair.
Select the correct answer from the options below.
Answer: D
Both are true and the second explains the first. Weight is only one term in the account, and for many aircraft the manufacturing and through-life costs of composite structure outweigh the mass saved. Regional aircraft in particular remain largely metal.
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