CORRECT!

4). If the engine oil temperature and cylinder head temperature gauges have exceeded their normal operating range, the pilot may have been operating with

a). too much power and with the mixture set too lean.
b). higher-than-normal oil pressure.
c). the mixture set too rich.
The answer is:
a). too much power and with the mixture set too lean.

First of all, a lean mixture results in a hotter-burning engine than a rich mixture. So, if the oil temperature or cylinder head temperature guages indicate that the engine is operating too hot, the first thing I might do is enrichen the mixture. Then I would refer to the checklist, conveniently located within reach of the pilot of course, to ensure that all recommended steps are followed in troubleshooting a potentially dangerous anomaly.

It is normal for engine temperature guages to indicate hotter temps during high-power operations, like climbs and slow flight where altitude maintenance is the goal. Keeping a close watch on these guages during any flight operation can help the pilot to catch any potential problems early enough to avoid possible catastrophic engine failure.

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