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AdjNounNumbers t1_j5mmogz wrote

Reply to comment by OldManCinny in NTSB details deadly accident involving airport ground worker | AP News by oliverkloezoff

>Why did the plane have to stay powered on? Could they not have powered it down?

"An auxiliary power unit used to power the plane without using the engines was not working, according to the safety board, and pilots decided to leave both engines running for a two-minute engine cool-down period while they waited to for the plane to be connected to ground power."

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Spirited_Voice_7191 t1_j5n5k7o wrote

And because of that the ground crew was briefed about the change. Must have not really paid attention and fell back into habits.

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OldManCinny t1_j5n57qo wrote

I read the article. Why did it need to be powered for those 2 minutes?

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eeisner t1_j5nia8c wrote

Jet engines need time to cool down before they are safe to power down and approach safely. For example, procedure on a 737 is 3 minutes at taxi thrust (N2 30% or less) before it is safe to switch to APU for power and shut down the engines.

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axonxorz t1_j5p093e wrote

That's just to keep the coolant system online and drawing heat away at low throttle to reduce shock on the engines?

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