Discussion
Assertion (A): Engine vibration is trended over successive flights.
Reason (R): A rising trend indicates developing imbalance before any other parameter responds.
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 explains the practice. Baseline vibration differs between individual engines of the same type, so an absolute reading carries little information; change is what signifies.
A rising trend appears as soon as an imbalance begins to develop - blade damage, a shifted balance weight, a bearing starting to wear - well before the loss of efficiency shows in exhaust temperature or fuel flow. That early warning is the whole point of trend monitoring, allowing a borescope inspection to be scheduled rather than forced.
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