Propeller System

Question 1

PCU provides control of propeller pitch by:

Answer 1

Controlling flow of oil to the pitch actuator in response to FADEC signals

Question 2

MPU

Answer 2

Magnetic pulse unit

-detects passing of blades, communicates position to fadecs
-provides backup NP sensing

Question 3

Propeller control switch (FEATHER)

Answer 3

-Activates AUX feather pump and feathers propeller
-shuts off after 20 seconds
-must be LSGI with power levers in Gnd Idle OR Eng start switches must be in stop

Question 4

Propeller control switches (NORMAL)

Answer 4

NORMAL position is used to shut off AUX feather pump

Question 5

Propeller control switches (UNFEATHER)

Answer 5

-used on ground with start switches to STOP, NG zero %
-activated aux feather pump and commands propeller to unfeather, will drive towards full reverse unless switch is released