For engine shutdown, operate engines at or near idle (N2 <= 80%) for how long?

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Multiple Choice

For engine shutdown, operate engines at or near idle (N2 <= 80%) for how long?

Explanation:
Starting with the idea that engines need a gentle cooldown before shutdown. Running at idle, with N2 kept at or below about 80%, allows heat to dissipate and oil pressure to stabilize without the stress of full power. This helps protect hot sections and bearings from thermal shock and ensures lubrication remains steady as you transition to shutdown. Two minutes provides enough time for temperatures and pressures to settle, which is why it’s the recommended duration. Shorter than that may not let the engine cool adequately, while longer idle isn’t necessary and simply wastes time.

Starting with the idea that engines need a gentle cooldown before shutdown. Running at idle, with N2 kept at or below about 80%, allows heat to dissipate and oil pressure to stabilize without the stress of full power. This helps protect hot sections and bearings from thermal shock and ensures lubrication remains steady as you transition to shutdown. Two minutes provides enough time for temperatures and pressures to settle, which is why it’s the recommended duration. Shorter than that may not let the engine cool adequately, while longer idle isn’t necessary and simply wastes time.

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