Common Aircraft Landing Gear Components Explained
Author : Aerospace Unlimited | Published On : 09 Jun 2026
Aircraft landing gear is one of the most important systems on an airplane. It supports the aircraft while it is on the ground and allows it to safely take off, land, and taxi. Although passengers often notice the landing gear during takeoff and landing, many of its components work together behind the scenes to ensure smooth and reliable operation. Understanding these parts provides valuable insight into how modern aircraft maintain safety and stability throughout ground operations.
What Is Aircraft Landing Gear?
Landing gear is the structure located beneath an aircraft that supports its weight whenever it is not flying. It absorbs the impact of landing, helps maintain stability while taxiing, and allows the aircraft to move safely on runways and taxiways. Depending on the aircraft's design, the landing gear may be fixed or retractable, with retractable systems being more common in commercial and high-performance aircraft.
Shock Strut
The shock strut, also known as the oleo strut, is one of the primary components of the landing gear. Its main purpose is to absorb the forces generated when an aircraft touches down. The strut contains hydraulic fluid and compressed gas, which work together to cushion the landing and reduce stress on the aircraft structure. Without an effective shock strut, even a routine landing could place excessive strain on the airframe and create an uncomfortable experience for passengers.
Wheels and Tires
Aircraft wheels and tires are specifically designed to withstand extremely heavy loads and high landing speeds. Unlike automotive tires, aircraft tires are built with reinforced materials that can tolerate rapid acceleration, intense braking, and repeated impacts. They also provide the necessary traction for taxiing, takeoff, and landing while supporting the aircraft's full weight on the ground.
Braking System
The braking system allows pilots to slow down and stop the aircraft after landing or during taxi operations. Most modern aircraft use hydraulic brakes mounted inside the wheel assemblies. These brakes provide controlled stopping power and are designed to perform reliably under demanding conditions. Larger commercial aircraft often include advanced braking technologies such as anti-skid systems, which help prevent wheel lockup and improve braking efficiency on wet or slippery runways.
Torque Links
Torque links are mechanical arms attached to the shock strut that prevent the inner and outer sections of the strut from rotating independently. By maintaining proper wheel alignment, torque links help ensure stable steering and smooth ground movement. They also contribute to reducing wear on landing gear components during taxiing and landing.
Axle
The axle serves as the mounting point for the aircraft wheels. It transfers the aircraft's weight from the landing gear structure to the wheels while allowing them to rotate freely. Because the axle experiences significant loads during takeoff and landing, it is manufactured from high-strength materials capable of withstanding repeated stress throughout the aircraft's service life.
Landing Gear Doors
Many aircraft equipped with retractable landing gear include landing gear doors. These doors cover the landing gear compartment after the wheels retract into the fuselage or wings. Closing the gear doors improves the aircraft's aerodynamic performance by reducing drag during flight. The doors open automatically before landing gear deployment and close again after retraction.
Retraction Mechanism
Retractable aircraft use a hydraulic or electrically powered retraction mechanism to extend and retract the landing gear. This system includes actuators, linkages, and locking devices that ensure the landing gear remains securely positioned whether it is extended for landing or retracted during flight. Reliable operation of the retraction mechanism is essential for both flight safety and aircraft performance.
Steering System
The nose landing gear is usually equipped with a steering system that enables pilots to maneuver the aircraft while taxiing. Steering is controlled through cockpit pedals or a dedicated steering tiller, depending on the aircraft type. This system allows precise directional control on the ground, making it easier to navigate taxiways, parking areas, and runways.
Position Indicators and Sensors
Modern aircraft include various sensors and indicators that continuously monitor the status of the landing gear. These systems provide pilots with confirmation that the landing gear is fully extended, properly locked, or safely retracted. Visual cockpit indicators and warning systems help prevent landing gear-related incidents by alerting the crew if the system is not in the correct position.
Importance of Regular Inspection
Landing gear components experience significant mechanical stress during every flight cycle. For this reason, regular inspections and maintenance are essential. Maintenance personnel carefully examine tires, brakes, hydraulic systems, shock struts, actuators, and structural components for signs of wear, corrosion, leaks, or damage. Timely maintenance helps extend component life, improve reliability, and ensure compliance with aviation safety standards.
Conclusion
Aircraft landing gear is a complex system made up of several carefully engineered components that work together to support safe ground operations. Parts such as the shock strut, wheels, brakes, axle, steering system, torque links, landing gear doors, and retraction mechanism each play a specific role in ensuring smooth takeoffs, stable taxiing, and safe landings. Understanding these common landing gear components provides a better appreciation of the engineering behind every successful flight and highlights the importance of regular maintenance in keeping aircraft operating safely and efficiently.
