retraction lock

retraction lock
A lock in the landing gear that prevents the landing gear from being retracted inadvertently on the ground. Also called a squat switch.
Retraction lock or squat switch is mounted in a bracket on one of the main gear shock struts. This switch is actuated by a linkage through the landing gear torque links. When aircraft is on ground, the torque links open the switch to prevent inadvertent retraction of landing gear. In an emergency, it is possible to retract landing gear on ground by selecting the switch to the correct position.

Aviation dictionary. 2014.

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