Question id 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