Discussion
Statement I: Engine vibration is judged by its trend rather than a single reading.
Statement II: Baseline vibration differs between individual engines of the same type.
In the light of the above statements, choose the correct answer.
Answer: B
Correct answer: Both Statement I and Statement II are correct
Both are true and the second explains the first. Individual engines of the same type run at different baseline vibration levels, because of manufacturing tolerances, balance history and installation, so an absolute figure carries little information on its own.
What signifies is change: a steady rise over successive flights with nothing else altered points to a developing imbalance - blade damage, a shifted balance weight or bearing wear. Engine condition monitoring is therefore built on trends in vibration, exhaust temperature and fuel flow rather than on single readings against fixed thresholds.
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