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8
Lordkek 8 points ago +8 / -0

That’s the turboshaft engine warming up. They don’t spin the blades until everyone is onboard and the doors are closed.

5
SaratogaPatriot 5 points ago +5 / -0

Ok that is at least one thing that makes sense. Thx.

2
H0rse 2 points ago +2 / -0

If it's anything like what I'm familiar with, that might be the APU