Describe The Propeller System

Question 0

What does the oil pressure do to the propeller?

Answer 0

Increasing Oil pressure moves the blades to a low pitch - high RPM (unfeathered) position.

Decreasing oil pressure allows a nitrogen cylinder, spring, and centrifugal counterweights move the blades to a high pitch - low RPM (feathered) position.

Question 1

Who makes the propellers?

Answer 1

Hartzell

Question 2

Which lever manipulates oil pressure to the propeller?

Answer 2

The blue propeller control handle

Question 3

Which unit regulates the oil pressure to the propeller?

Answer 3

The propeller governor.

Question 4

Define constant speed

Answer 4

Constant RPM regardless of flight attitude

Question 5

What unit adjusts the propeller to maintain a constant RPM and how does it do it?

Answer 5

After RPM selection with the blue prop control, the propeller governor automatically varies oil pressure in the propeller hub to change the prop blade pitch in order to maintain a constant engine RPM.

Question 6

Define full feathering

Answer 6

Propellers which can fully feather mean they can be aligned with the relative wind. Rotating from a high to low pitch resulting in different RPM settings,

Question 7

Will the propeller always feather?

Answer 7

Yes, if oil pressure is lost, the propeller will feather when the RPM is above 950.

Question 8

What are centrifugal stop pins?

Answer 8

The pins prevent propeller feathering below 950 rpm. This allows the blades to remain at a low pitch upon engine shut down. This will prevent excessive loads on the engine starter during the next start up.

Question 9

What is the true purpose of the centrifugal stop pins?

Answer 9

To prevent excessive loads on the engine starter during the next engine start.

Question 10

What is the correct action for a propeller overspeed?

Answer 10

Retard the throttle
Prop control to full decrease RPM And then set if any control is available.
Reduce airspeed and throttle used to maintain 2700 rpm.