Quote:
Originally Posted by Polar742  Free-power turbines, such as the PT-6 on the King Air and the GE on the SAAB, don't require that the prop turns in order to start the engine. So it's easier to let them bleed off to feather, or some procedures (I'm reaching way back) and systems are designed to place the prop to feather prior to shutdown. Usually bringing the condition levers to cutoff will feather the engine as it shuts down (I think this is the way it was in the King Airs - again, I'm reaching deep in the memory, so I could be completely off base) |
Yes, this is correct WRT the PT6. On the -25A the prop will return to feather somewhere in the 10-12 psi oil pressure range, so as the engine is shut down by pulling the cond. lever back to FUEL-OFF, the prop will slowly return to feather as the oil comes back out of the hub and pitch-change assembly.