Question id 49 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

Functions in parallel with an irreversible hydraulic actuator.
Functions in series with an irreversible hydraulic actuator.
Is mounted in parallel with a spring tab.
Is necessary in a reversible flight control actuator unit.

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