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Feathering Propeller

Feathering Propellers

QuestionAnswer
In a modern feathering propeller, what forces are used to move the propeller blades to high blade angle? springs, air pressure in the dome, and/or counterweights
In the Hartzell and McCauley feathering propellers, what is used to keep the propeller blades in low pitch when the engine is shutdown? spring loaded latch mechanisms
In a propeller anti-icing (slinger ring) system, what is used to control the output of the pressure pump? A Rheostat
What is the result of ice of accumulating on a propeller blade? Thrust will be decreased and vibration will increase
What is the purpose of the lift rod in the governor of the feathering propeller system? It raises the pilot valve allowing oil pressure to be released from the propeller
The Hartzell Compact propeller uses ___________________ to force the propeller into feather. Accumulator air pressure
What type of fluid is generally utilized for propeller anti-icing systems? Isopropyl Alcohol
Why are automatic synchronization systems used on aircraft propeller systems? To control engine RPM and reduce vibration
What is used in the Hydromatic propeller as a source to force the propeller into a selected position? oil pressure
What occurs in the Hydromatic propeller distributor valve during the unfeathering operation? It will shift to reverse the oil passages to the piston in the propeller dome.
In a slinger ring propeller anti-icing system _______________________ is used to eject fluid onto the propeller. centrifugal force
In the propeller electric deicer system _________________________ are used to transfer/bridge the stationary engine power source and the rotating propeller deicer boots. slip rings and brushes
How can the proper operation of an electric deicer system be determined? check ammeter movement and feel the boots for sequence of heating
In the Hydromatic propeller system, what is the function of the feathering relay? It activates the propeller feather button holding coil
How is the Hydromatic propeller unfeathered? Hold feathering button to override the pressure cutout switch resulting in the distributor valve shifting to port oil to unfeather
What causes erratic or jerky Hydromatic propeller operation? sludge build-up in the dome assembly
In the Hydromatic propeller system, _________________ is used for lubrication. pitch-changing oil
In the Hydromatic propeller feathering operation, what is the action of the feathering button? It is depressed for activation, holding coil activated and then automatically released at 650 psi oil pressure
In the Hydromatic propeller unfeathering operation, what is the action of the feathering button? It is depressed for activation, manually held in to override the 650 psi pressure switch until unfeathering occurs
After servicing the Hydromatic propeller, why is it necessary to cycle the propeller through its range of motion several time? to free entrapped air in the system
What causes the Hydromatic propeller system to shut off the pressure pump when the blades reach the unfeathered position? The 650 psi cutout switch
Where does the oil pressure in the Hydromatic propeller system come from for feathering and unfeathering? high pressure oil from an independent oil tank and electric pump
What is used to unfeather a Hartzell or McCauley propeller? a ball-type or cylindrical-type accumulator
What is used to prevent feathering propellers from going into feathering position when the engine is shutdown? Mechanical latches
In a propeller synchrophasing system reduces noise and vibration by adjusting the __________________________ between the propellers on two or more engines? phase angle
What unit in the multiengine aircraft, automatic propeller synchronization system is used for controlling the actuation? the propeller governors
Created by: bgilbert
 

 



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