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15 - ATPL - The Ram Air Turbine (RAT) provides emergency hydraulic power for:

Question 15 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

Undercarriage selection and automatic brake system.
Flight controls in the event of loss of engine driven hydraulic power.
Flap extension only.
Nose wheel steering after the aeroplane has landed.

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