−
A Power Control Lever (PCL) switch
−
A PUSHER test switch.
The system gets signals from:
−
The flaps system, refer to AMM 12-B-27-50-00-00A-040A-A
−
The air intake deice system, refer to AMM 12-B-30-20-00-00A-040A-A
−
The left and right Weight On Wheels (WOW) relays, refer to AMM 12-B-32-60-00-00A-040A-A or 12-B-32-60-
00-00A-040B-A
−
The oil pressure switch, refer to AMM 12-B-79-00-00-00A-040A-A.
The system gives outputs to the Modular Avionics Unit (MAU) dual channel Generic Input/Output (GIO) modules.
The MAU gives the signals to these systems:
−
The autopilot system, refer to AMM 12-B-22-10-00-00A-040A-A
−
The audio integrating system or the dual audio integrating system, if installed:
●
For the audio integrating system, refer to AMM12-B-23-50-00-00A-040A-A or 12-B-23-50-00-00A-040B-A
●
For the dual audio integrating system, refer to AMM 12-B-23-50-10-00A-040A-A or 12-B-23-50-10-00A-
040B-A
−
The Master Warning System (MWS), refer to AMM 12-B-31-50-00-00A-040A-A.
The power supplies to the system are:
−
28 VDC through the STALL WARN 1 (ESSENTIAL BUS) circuit breaker
−
28 VDC through the STALL WARN 2 (MAIN BUS) circuit breaker
−
28 VDC through the PUSHER SYS (ESSENTIAL BUS) circuit breaker.
2
Component Description
2.1
Stick Pusher Computer
The stick pusher computer is installed below the floor between frames 17 and 18 in a rectangular box with three
electrical connectors on the front. It has two stick pusher channels which have separate 28 VDC supplies from
different busbars.
Each channel gives a 28 VDC output to the torque transducer. The two channel outputs to the torque transducer
are connected to a terminal block. The terminal block also connects the channels to each other. If the 28 VDC
supply to one channel becomes defective, the 28 VDC output from the other channel will then supply the torque
transducer and the other channel with a 28 VDC input. This keeps the two stick push channels operational and the
torque transducer continues to have a 28 VDC supply.
2.2
Stick Pusher Channels
The stick pusher computer contains two independent channels which are the same. They get the same data from
the engine oil pressure switch, the torque transducer and the Flap Control and Warning Unit (FCWU). Channel 1
also gets signals from the left AOA transmitter and the left WOW relay. Channel 2 also gets signals from the right
AOA transmitter and the right WOW relay. The two channels operate independently for the stick shaker and audio
stall warning functions. The two channels operate together for the stick pusher function.
PC-12/47E AMM Doc No 02300, ISSUE 01 REVISION 26 MSN 545, 1001-1719,
1721-1999
12-B-AM-00-00-00-I
UNCLASSIFIED
Effectivity: All
12-B-22-20-00-00A-040A-A
UNCLASSIFIED
2021-12-04 Page 3
