Originally Posted by
SASless
It has been a very long time since I was punished by having to fly a Jet Ranger....but my point about the valve operation is correct in that it is can be open in varying amounts during normal engine operation....correct?
It starts fully open....and is fully closed by about 92% I am thinking.
Rapid acceleration of the engine will also cause it to open unless I am mistaken.
I have far more experience with PT-6's and Lycoming Engines than I do Allisons.
Here is a screen shot of the valve sequencing for a C47 engine (Bell Training Handbook). I believe the C30 is the same or very close. I think the 92% value is related to the inducer bleed port (suck/blow).
