AM.III.M.K4

From the FAA library

• Aviation Maintenance Technician Handbook - Powerplantp. 7-6
  Chapter 7: Propellers › Types of Propellers › Controllable-Pitch Propeller

  Ground-Adjustable Propeller The ground-adjustable propeller operates as a fixed-pitch propeller. The pitch, or blade angle, can be changed only when the propeller is not turning. This is done by loosening the clamping mechanism that holds the blades ... tightened, the pitch of the blades cannot be changed in flight to meet variable flight requirements. The ground-adjustable propeller is not often used on present-day aircraft. Controllable-Pitch Propeller The controllable-pitch propeller permits a change of blade…

• Pilot's Handbook of Aeronautical Knowledgep. 7-6
  Chapter 7: Aircraft Systems › Adjustable-Pitch Propeller

  Adjustable-Pitch Propeller The adjustable-pitch propeller was the forerunner of the constant-speed propeller. It is a propeller with blades whose pitch can be adjusted on the ground with the engine not running, but which cannot be adjusted ... flight. It is also referred to as a ground adjustable propeller. By the 1930s, pioneer aviation inventors were laying the ground work for automatic pitch-change mechanisms, which is why the term sometimes refers to modern constant-speed propellers that…

• Aviation Maintenance Technician Handbook - Powerplantp. 7-8
  Chapter 7: Propellers › Propeller Governor

  Propeller Governor A governor is an engine rpm-sensing device and high-pressure oil pump. In a constant-speed propeller system, the governor responds to a change in engine rpm by directing oil under pressure to the propeller hydraulic cylinder ... hydraulic cylinder. The change in oil volume in the hydraulic cylinder changes the blade angle and maintains the propeller system rpm. The governor is set for a specific rpm via the flight deck propeller control, which compresses or releases…