Pilot's Operating Handbook
Section 7
Description
Edition 0 - October 31, 2013
Rev. 4
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 transmitted to the GARMIN system fordisplay onthe MFD,
under normal display conditions.
Power turbine tacho-generator (Np)
Powerturbinetacho-generatoris attachedon theright side ofthe reduction gearbox.It
supplies a voltage which is transmitted to the GARMIN systemfor 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
convertspressuredifference into a voltage. This voltage is transmitted to 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 rightside ofthe reduction gearbox. Itis ratedtolimitengine
torque to 108 % at sea level.
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