Undercarriage
Appearance
![](http://upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Underc.a330.arp.750pix.jpg/220px-Underc.a330.arp.750pix.jpg)
In aviation, the undercarriage or landing gear is the structure (usually wheels) that supports an aircraft and allows it to move across the surface of the Earth when it is not flying.
In aviation, the undercarriage or landing gear is the structure (usually wheels) that supports an aircraft and allows it to move across the surface of the Earth when it is not flying.