This document provides an overview of aircraft landing gear systems. It describes the main components, including the types of landing gear arrangements (tail wheel, tandem, tricycle), construction details, alignment and retraction mechanisms, nose wheel steering, braking systems, tires, and antiskid systems. The purpose of landing gear is to support the aircraft during landing and taxiing. Retractable gear stows in the fuselage or wings to reduce drag while flying. Nose wheel steering and braking systems provide directional control on the ground. Aircraft tires must withstand high loads and provide traction for takeoff and landing. Antiskid systems help maintain braking effectiveness.