NF/TQ SENSORSOn the PT6C-67C engine

NF/TQ SENSORS
On the PT6C-67C engine two independent NF/TQ sensors are installed.
Each sensor detects both NF speed and engine Torque. They are located on
the bottom of the No. 5 bearing support housing.
They are double magnetic coil sensor which use the torque shaft toothed
wheel in the output section as the speed/torque reference.
The sensors detect the passage of the torque shaft teeth and generate an
AC electrical signal due to the change in the magnetic flux associated with
the proximity of the gear tooth in relation to the sensor tip.
The sensors are interfaced with the EEC and the cockpit display, via the
engine wiring harness.