wrote in message
...
Not sure how that statement fits in to the discussion, but the PT6
governors
work differently from those found on most piston-engine singles.

Doesn't have anything to do with it, this is Usenet.

Okay...just thought I'd ask.

The base of a governor is another oil pump, stepping up engine oil
pressure to over 175 psi. Maximum pressure is limited by a
spring-loaded pop-off valve, just like the engine oil pump.

Yes, but as far as I know, that pump will work just as well as the engine
pump. Also, even if for some reason that pump failed, my understanding is
that it would simply reduce the responsiveness of the governor. It wouldn't
cause it to stop working altogether. The engine-supplied oil pressure would
be sufficient.

Agreed, like I indicated in another post, the oil pump/governor
doesn't care what's turning it.

Well, color me confused then. I thought we started this thread with you
suggesting that if the engine has failed, resulting in low RPM, you wouldn't
be able to get the prop to the coarse pitch setting.

But, if you agree with what I said, so much the better.

Pete