Engines-Propellers Flashcards
The hydraulic over speed governor increases Propeller pitch when propeller speed exceeds approximately what?
1236 Np
The propeller synchro phase system uses which engines propeller as the master?
Engine #1
The pneumatic section of the overspeed Governor increases propeller pitch when propeller speed exceeds approximately what?
1309 NP
Auto feather is triggered when the failing engine falls below what?
28% torque
The propeller control unit is mounted on the what?
The reduction gearbox
The beta backup system provides protection against the propellers entering the beta ground range when ?
When the power levers are forward of the ground range
Propeller overspeed Governing is achieved how?
Hydraulically and Pneumatically
Should oil pressure be lost to the propeller control unit the pitch lock feature does what?
Prevents the blades from reducing the angle more than 1°
Prior to synchro phase system Activation the propellers must be manually synchronised to within what?
20 NP
The PCU controls blade angle by metering oil to one side of the pitch change mechanism, and is oppose by what?
Engine oil pressure
Aerodynamic loads on the propeller tend to drive the blades to what blade angles?
Low blade angles
The pitch lock feature stops the speed of the propeller increasing more than what?
More than 2% from the point of the oil pressure loss
How does the propeller governor set rpm using the condition leavers in the forward thrust range?
By adjusting spring pressure on a set of internal Governor flyweights
What two things feather the propeller?
The feather solenoid or the mechanical feather valve.
At what blade angle do you get the propeller ground range indication lights?
+16.5° which corresponds to just below flight idle
