Discussion
Match each detail in List I with the concern it addresses in List II.
List I
A. Tear strap
B. Mass balance on a control surface
C. Tapered stringer run-out
D. Engine pylon fuse pin
List II
1. Flutter
2. A running crack in a pressurised skin
3. Clean engine separation in an overload
4. A local stress peak where load transfers into the skin
Select the correct match.
Answer: A
Each is a small piece of hardware answering a specific failure mode, and each has an accident history behind it. Details of this kind, rather than the sizing of the main members, are where most in-service structural trouble originates.
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