Torque Pressure Sensor
The torque pressure sensor
sends oil pressure information to the FADEC which
uses it to calculate the torque applied to the propeller.
The torque pressure sensor is mounted on the reduction gearbox.
Propeller Operations
The airplane is equipped with a composite five-bladed, constant-speed and full-
feathering propeller.
Propeller Control Unit (PCU)
The PCU is an electro-hydro-mechanical device (servo-valves) that modulates the
propeller blade angle within the entire operational envelope of the engine.
To control the propeller blade angle, the PCU uses high pressure engine oil. Oil
pressure delivered by the PCU drives blades toward low pitch (including reverse
range) while counterweights drives blades toward high pitch (feather).
The PCU is mounted on the reduction gearbox, forward of the engine.
In flight, the PCU modulates the propeller blade angle in order to govern propeller
at nominal speed.
On ground, or during descent, when engine power is not sufficient to govern at
nominal speed, the propeller blade angle will be a resultant from the THROTTLE
position.
Np/Beta Sensors
Two Np/beta sensors (variable reluctance magnetic sensors) are used to measure
timing between the teeth of the beta ring which is located at the rear of the
propeller with longitudinal and oblique protuberances.
The FADEC uses this data to determine the propeller pitch angle and the propeller
speed (Np).
Np value (PROP RPM) can be monitored by the pilot on the single engine
indicator ā refer to
Paragraph Engine Monitoring .
The Np/beta sensors are
symmetrically mounted at the lower part of the reduction
gear box, forward of the engine.
Reverse Operation
Propeller reverse pitch enables reduced landing roll.
Reverse is selected via the THROTTLE ā refer to
Paragraph Engine Control
Lever .
Section 7
Description
Pilot's Information Manual
PIM TBM 960 - Edition 0
Rev. 02
Page 7.6.24
PIM - DO NOT USE FOR FLIGHT OPERATIONS
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