Discussion
Consider the following statements about oil system indications:
1. Falling pressure with rising temperature suggests a loss of oil quantity.
2. A single faulty probe would normally move one indication alone.
3. Oil temperature alone is sufficient to diagnose a leak.
Which of the statements given above is or are correct?
Answer: A
Correct answer: 1 and 2 only
The first two are sound. Falling pressure with rising temperature is the classic loss-of-quantity signature: less oil cannot sustain the pressure, and the same heat rejected into a smaller mass raises its temperature. And a single faulty probe would normally move one indication alone, which is why two consistent indications point to a real fault rather than an instrument one.
The third is false. Oil temperature rises for other reasons - a blocked cooler, a hot day, high power - so it cannot diagnose a leak by itself. It is the combination that identifies the cause.
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