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What does a yellow boxed FAIL indication displayed in the center of the N1 dial indicate?

A. An engine fire
B. Low engine oil pressure
C. A failed generator
D. An engine overspeed condition

Answer :

Final answer:

The N1 dial in an aircraft relates to the fan speed of the jet engine. A yellow boxed FAIL indication on this dial generally signifies a failed generator, indicative of problems with the engine's electrical generator system.

Explanation:

In the context of aircraft operation, the N1 dial is associated with the fan (or low pressure) speed of a jet engine, and is normally presented as a percentage of maximum RPM. When a yellow boxed FAIL indication is displayed on the center of the N1 dial, it typically signifies a failed generator. This signifies an issue with the electrical generator system that is part of the engine assembly and drives power for various aircraft systems. The other options, such as engine fire, low engine oil pressure or an engine overspeed condition would likely provide different warning indications or signals.

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