ATR 42 Model : 400/500
SYSTEMS OPERATING
POWER PLANT
P 2
NOV 98
001
1.16
.
30
30.2 ENGINE GOVERNING
MAIN UNITS (HMU-EEC-PVM-PWR MGT)
HYDROMECHANICAL UNIT (HMU)
- Performs fuel metering in steady state operation and protects the system in case of
transients.
- Commands a rotor speed in accordance with 2 laws (NH = f (PLA)) :
. 1 st law (called top) used when EEC is ON to protect NH overspeeds.
. 2 nd law (called base) used when EEC is OFF.
- Includes a stepper motor which adjusts the flow controlled by the hydromechanical
channel, in accordance with commands transmitted by the EEC.
- Ensures engine shutdown (HP fuel S/O).
- Delivers a motive flow to the fuel tank jet pump.
ENGINE ELECTRONIC CONTROL (EEC)
- Regulates a given power, by controlling the stepper motor, to obtain a predicted
torque as a function of :
D
the power lever position
D
the PWR MGT selector position
D
flight conditions
D
the position status of the bleed air valves
Note : Operating line with EEC ON may be placed above or below the HMU BASE
LAW depending on weather conditions.
AA
R
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