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354 - ATPL - The pilot may be prevented from retracting the landing gear whilst the aircraft is on the ground by:

Question 354 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

A guard on the selector switch which cannot be moved until the aircraft is airborne.
The electrical control system being routed through the weight on wheels switch.
A pneumatic interlock which disables the hydraulic up selector.
Any attempt to select the landing gear up will result in a flashing warning light and a loud horn.

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