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373 - ATPL - On many small piston-engine aeroplanes fitted with constant-speed propellers, blade pitch is changed:

Question 373 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

Hydraulically by hydraulic fluid.
By an electrical actuator.
Hydraulically by engine oil.
By a mechanical linkage.

Training tests and timed exam simulations ATPL - Airline Transport Pilot license