Pilot's Operating Handbook
Section 7
Description
Edition 1 - January 15, 2018
Rev. 0
Page 7.6.11
Compressor turbine tacho-generator (Ng)
Com
pressor turbine tacho-generator (Ng) is attached on accessory gearbox. It
supplies a voltage which is transmittedto the GARMINsystem fordisplay onthe MFD,
under normal display conditions.
Power turbine tacho-generator (Np)
Powerturbine tacho-generator is attached on therightside ofthe reductiongearbox.It
supplies a voltage which is transmittedto the GARMIN system for display on the MFD,
under normal display conditions.
Torque transmitter
Torque transmitter is attached on the torque limiter, it measures torque produced by
the power turbine by comparing oil pressures (reduction gear and power turbine) and
convertspressure difference into a voltage.This voltage is transmittedto theGARMIN
system for display on the MFD, under normal display conditions.
Propeller overspeed limiter
Propeller overspeed limiter is installed on left side of the reduction gear box. It
prevents a propeller overspeed in case of main propeller governor failure.
Propeller overspeed limiter is equipped with a solenoïd which makes feather the
propeller when the THROTTLE is in condition mode.
Torque limiter
Torque limiterislocated on right side of the reduction gearbox.Itisratedto limitengine
torque to 109-110 % at sea level.
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