Discussion
Match each historical event or programme in List I with what it established in List II.
List I
A. Comet accidents
B. Aloha Airlines 243
C. Ageing aircraft programmes
D. Damage tolerance rules
List II
1. Widespread fatigue damage in a high-cycle airframe
2. Pressurisation fatigue as a first-order design case
3. Crack growth analysis setting inspection intervals
4. Systematic inspection of high-cycle fleets
Select the correct match.
Answer: A
Correct answer: A-2, B-1, C-4, D-3
Four points in the same history. The Comet accidents established pressurisation fatigue as a first-order design case; Aloha 243, where a section of upper fuselage separated in flight, demonstrated widespread fatigue damage in a very high-cycle airframe; the ageing aircraft programmes that followed instituted systematic inspection of high-cycle fleets; and the damage tolerance rules made crack growth analysis the basis for setting the intervals.
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