Discussion
Match each symptom in List I with the most likely cause in List II.
List I
A. Falling oil pressure with rising oil temperature
B. Rising exhaust temperature at a fixed thrust setting
C. Vibration rising over successive flights
D. Target pressure ratio set but all other parameters low
List II
1. Loss of oil quantity
2. Deteriorating gas path condition
3. Developing rotor imbalance
4. A blocked engine pressure ratio probe
Select the correct match.
Answer: D
Correct answer: A-1, B-2, C-3, D-4
Each symptom points to its own system. Falling oil pressure with rising oil temperature indicates a loss of oil quantity, since less oil sustains neither the pressure nor the heat load.
Rising exhaust temperature at a fixed thrust setting shows the gas path deteriorating, the engine working harder for the same output. Vibration rising over successive flights indicates a developing imbalance in the rotating assembly. And a target pressure ratio achieved while every other parameter reads low points to the indication itself - a blocked EPR probe, the one case where the instrument rather than the engine is at fault.
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