Discussion
Assertion (A): Fail-safe design has largely replaced safe-life design for transport airframes.
Reason (R): Fail-safe structures retire every component at a fixed life regardless of inspection.
Select the correct answer from the options below.
Answer: D
The assertion is true but the reason describes safe-life, not fail-safe. A fail-safe structure provides an alternative load path so that a cracked member is carried until the damage is found by inspection. Safe-life retirement is the approach reserved for parts where redundancy is impractical, such as landing gear.
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