Plain English Meaning

Something going wrong during landing because of the wheels and their supporting structure — for example, landing too hard, landing with the wheels still up, or losing control on the ground because a wheel collapsed or struck something.

Full Definition

An accident or incident during landing or ground operations in which the landing gear is the primary contributor to the damage or unsafe outcome. This includes hard landings that overstress the gear, landing with the gear retracted, collapsed gear from side loads or improper touchdown technique, and runway excursions caused by gear failure or mishandling.

Context Anchor

Seen in approach and landing discussions, especially with retractable-gear airplanes and .