着陆装置
起落装置
防收锁

[ noun ]
an undercarriage that supports the weight of the plane when it is on the ground
<noun.artifact>

landing gear \land"ing gear`\, n.
The wheels and attached structures under an airplane that
support it and allow it to move when on the ground; also, the
floats or pontoons of an amphibious airplane together with
their supporting structures. Landing gear may be fixed
rigidly in place, or retractable when in flight.
[PJC]