ATR 42 Model : 400
SYSTEMS OPERATING
POWER PLANT
P 3
NOV 98
400
1.16
.
30
- Ensures minimum propeller speed control, on ground and at low power (see
propeller governing).
- Delivers, in case of engine failure at take-off, automatic uptrimmed take-off power
to the valid engine (ATPCS) by reponding to the signal generated by the
Auto-Feather Unit (AFU) of the failed engine.
- Controls the modulated opening of the Handling Bleed Valve (HBV), so as to ensure
correct LP compressor operation.
PROPELLER VALVE MODULE (PVM)
- At high power, controls the propeller maximum speed Np, according to the PWR
MGT selection.
- Controls propeller pitch at low power and when using reverse.
- Ensures low pitch through a solenoid (when PLA are below FI position).
PWR MGT SELECTOR
LINE A : One engine out operation
LINE B : Normal TO or MCT
LINE C : CLB or CRZ
Note : Sensible sector designed to allow fix throttle engine control
AA
R
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