The PCU modulates the propeller blade angle depending on the THROTTLE
position.
In reverse operation, the
FADEC limits engine power and propeller speed at 1,900
RPM.
Feathering
Depending on the conditions, the FADEC commands propeller feathering via the
PCU and/or via an independant electrical solenoid.
During engine start, the propeller is feathered until sufficient engine oil pressure is
available to pressurize the PCU.
Pilot Feather Request
The pilot can manually
request a propeller feathering via the GND FEATHER
guarded switch, located on the upper part of the pedestal console.
Before setting the GND FEATHER guarded switch to ON, the pilot must ensure
that all the following conditions are met:
- Airplane is on ground (for at least 5 seconds),
- Engine is running,
- The THROTTLE is in the IDLE position (for at least 5 seconds).
In this case, the PCU commands propeller feathering through the servo valve (i.e.
the independent electrical solenoid is not activated).
CAUTION
When the propeller is feathered and the THROTTLE is forced out of the IDLE
position, the propeller will no longer be feathered.
NOTE
When the propeller is feathered after a pilot request, the autothrottle
servomotor is clutched to prevent the THROTTLE from moving easily out of the
IDLE position.
Section 7
Description
Pilot's Information Manual
PIM TBM 960 - Edition 0
Rev. 02
Page 7.6.25
PIM - DO NOT USE FOR FLIGHT OPERATIONS
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