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351 - ATPL - In some aircraft, there is a protection device to avoid the landing gear being inadvertently retracted on the ground. It consists of:

Question 351 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

An aural warning horn.
A latch located in the landing gear lever.
A bolt.
A warning light which is activated by the weight on wheels sensor system.

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