Discussion
Match each design philosophy in List I with its defining requirement in List II.
List I
A. Safe life
B. Fail-safe
C. Damage tolerance
D. Static strength only
List II
1. An alternative load path if one member fails
2. Retirement at a fixed life
3. Carry limit and ultimate load, no fatigue consideration
4. Crack growth analysis setting inspection intervals
Select the correct match.
Answer: A
The three fatigue philosophies form a historical sequence, each answering a shortcoming of the last. Modern transport certification rests on damage tolerance, with safe life retained only where redundancy cannot be provided.
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