PILOT’S OPERATING HANDBOOK
SECTION 7
DESCRIPTION
Edition 0 -- October 31, 2013
Rev. 1
Page 7.6.9
ENGINE AIR INLET
Engine air inlet is located at front lower section of engine cowling. Air inlet port is protected against icing by a hot air
flux provided by engine. Air is driven throughout a duct in engine casing before entering engine through a protective
screen. An inertial separator system inside the air duct protects the engine from ingesting dense particles (water,
ice, fine gravels, sand).
Separator consists of two movable vanes. During normal operation, air is conducted directly towards engine air
inlet. To separate particles suspended in the air, vanes are positioned to force engine induction air to execute a
sharp turn : under the effect of centrifugal force denser particles separate from the air and are discharged
overboard through two apertures located under engine cowling.
Operation of inertial separator vanes is electrically controlled by ”INERT SEP” inverter located on ”DE-ICE
SYSTEM” panel. When inverter is set to ON, an electric actuator activates vanes ;
”INERT SEP ON”
CAS
message lights on when vanes have reached their maximum deflection and remains visible as long as switch
remains ON. Full deflection takes about 30 seconds.
EXHAUST SYSTEM
Exhaust gases are evacuated through exhaust stubs located on sides of engine cowlings.
ENGINE ACCESSORIES
All engine driven accessories [except power turbine tacho-generator (Np), propeller governor and overspeed
governor] are installed on accessory gearbox located rearwards of engine.
Oil pump
Oil pump is a self-controlled gear pump located at the bottom of oil casing.
Fuel high pressure pump (HP)
Fuel high pressure pump is installed on accessory gearbox. It supplies fuel nozzles, flow being controlled by fuel
regulator (FCU). Fuel provided by engine driven main pump (mechanical) enters high pressure pump through a
filter, then it is discharged under pressure into fuel regulator (FCU) through a second filter. In case of contamination
of this second filter, a by-pass valve allows fuel to go directly from high pressure pump to the regulator.
Compressor turbine tacho-generator (Ng)
Compressor turbine tacho-generator (Ng) is attached on accessory gearbox. It supplies a voltage which is
transmitted to the G1000 system for display on the MFD (under normal display conditions).
Power turbine tacho-generator (Np)
Power turbine tacho-generator is attached on the right side of the reduction gearbox. It supplies a voltage which is
transmitted to the G1000 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 converts pressure difference into a voltage. This
voltage is transmitted to the G1000 system for display on the MFD (under normal display conditions).
