Discussion
Assertion (A): Engines flying short sectors are maintained on cycles rather than hours.
Reason (R): Thermal fatigue damage accumulates per start and shutdown regardless of sector length.
Select the correct answer from the options below.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the justification. Since thermal fatigue damage is done by the start-up and shutdown transients rather than by the cruise, a thirty minute sector damages the blade almost as much as a ten hour one. Counting hours would therefore badly understate the damage on a short-haul engine, and the maintenance interval is set in cycles instead.
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