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143 - ATPL - On many transport-category aeroplanes, if normal hydraulic landing-gear extension is lost, alternate extension is usually achieved:

Question 143 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

By a mechanical release/free-fall system.
By hydraulic accumulators only.
Pneumatically.
Electrically.

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