Discussion
Match each fatigue load source in List I with its frequency in List II.
List I
A. Cabin pressurisation cycle
B. Ground-air-ground cycle
C. Gust encounters in cruise
D. Ultimate load application
List II
1. Once per flight, a full bending reversal
2. Once per flight, a full pressure cycle
3. Never expected in service
4. Many small cycles throughout each flight
Select the correct match.
Answer: B
The spectrum a transport is assessed against is dominated by the two once-per-flight cycles and filled in by the gust content. Ultimate load, by contrast, is a strength requirement that the aircraft is never expected to meet in service at all.
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