Discussion
Arrange these events in a developing oil system failure:
1. A leak develops and oil quantity begins to fall
2. Oil pressure starts to fluctuate and then fall
3. Oil temperature rises as less oil carries the same heat
4. The crew reduces power and diverts
5. Bearing damage follows if the engine keeps running
Select the correct sequence.
Answer: A
Correct answer: 1, 2, 3, 4, 5
The chain is causal and each step follows from the one before. A leak develops, so oil quantity begins to fall. With less oil in the system the pump eventually draws air and pressure fluctuates and then falls.
Temperature rises next, since the reduced quantity must carry away the same heat. The crew's response comes after those indications, reducing power to lower the heat load and diverting. Bearing damage is the outcome only if the engine keeps running without oil film, which is why the response is placed before it rather than after - the whole point of the drill is to arrive at step four before step five.
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