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626 - ATPL - An impulse coupling does not function at such speeds above those encountered in starting. Its engaging pawls are prevented from operating at higher speeds by

Question 626 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

Engine oil pressure
A coil spring
Centrifugal force
Electro-magnetic action of operating magneto.

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