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126 - ATPL - In hydraulic systems of large transport-category aeroplanes, the fluid commonly used is:

Question 126 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

Vegetable-oil-based fluid.
Mineral oil.
Water-glycol.
Phosphate-ester-based synthetic fluid.

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