Discussion
An aircraft flies \( 6 \) sectors a day for \( 300 \) days a year. Its annual pressurisation cycle count is
Answer: C
Correct answer: 1800
\[ 6 \times 300 = 1800\ \mathrm{cycles\ per\ year}. \] Each sector is one pressurisation cycle, and it is the cycles rather than the hours that consume the fuselage’s fatigue life - which is why the certified life of a transport structure is quoted in cycles as well as hours.
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