In fact.....................

A good test for the condition of your Allison engine is to wind that throttle open as fast as you like without exceeding limitations and the limits of the surface friction of course.

This will let you know if you have problems that may give you compressor stall............................ bad compressor plastic, bad rich FCU etc.

Call it a slam accell, opposite to the slam decell that everybody still does to check their FCU - yeh right.

Talk to your RR Allison Tech rep.