About the sensors from AVH:
By no-hoper on Sunday, Feb 15th 2015 21:59Z
@Anne. Indeed there is a small buckle for a couple seconds.I think it is related to the closing of the bleed valve.
I checked the wiring manual for the signal required to start autofeather: The signal of one
torque sensor (2ea installed per engine) via the autofeather unit and displayed as the torque pointer will start autofeather.
The MEL for a u/s sensor requires ATCPS off,same for the autofeather unit.
Note for both of them: select off to prevent uncommanded autofeather.