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Aircraft Landing Gear & Undercarriage Equipment

 Aircraft Landing Gear  & Undercarriage Equipment

 Landing gear is the undercarriage of an aircraft and may be used for either takeoff or landing. The landing gear includes all rolling components, struts, and activating mechanisms.

Landing gear, the principal support of the airplane during landing, mainly consists of the shock absorber, wheel, brake system, turning system, undercarriage retractile system, etc. It is used to absorb the landing impact energy so as to minimize the loads transmitted to the airframe. Since the landing gear bears heavy load during working, an accurate prediction for the load, especially for the dynamically changing landing impact load, is required to ensure that the designed landing gear is capable of withstanding the landing impact energy. Meanwhile, in consideration of airplane mobility and low energy consumption, lightweight design is also important.

Types of Landing Gear

Landing gear usually comes in three basic wheel arrangements: conventional, tandem and tricycle-type. Beyond this, landing gear is then classified as either fixed or retractable. Fixed landing gear hangs underneath an aircraft during flight, whereas retractable landing gear is stowed inside an aircraft during flight. Each arrangement and design is intended for a specific purpose and/or desired performance.


Conventional, tail dragger or tailwheel-type landing gear — it goes by many names. This type of landing gear utilizes two main wheels located ahead of the center of gravity to support the majority of the weight of the aircraft. Occasionally, the tail of the plane will require additional support from a third-wheel assembly. But some aircraft use a skid instead of a tail wheel, helping to slow the aircraft upon landing and providing better directional stability. Conventional landing gear is beneficial when operating in and out of non-paved runways as it provides increased clearance for the forward fuselage. Conventional landing gear also allows for adequate ground clearance for larger propellers.


Tandemlanding gear features the main gear and tail gear aligned on the airplane's longitudinal axis. This allows for the use of flexible wings on both sailplanes and select military aircraft. Designs do vary, though. Some only have one gear forward on the fuselage with a skid underneath of the tail, whereas others only use a small, outrigger gear under the wings for support.


Arguably the most common type of landing gear,tricycle-type gear includes the main gear and the nose gear. It's typically used on both large and light aircraft. With this design, the two main wheels are attached to the airframe behind the center of gravity. This supports most of the structure's weight, while a nose wheel usually provides steering control. There are quite a few benefits to tricycle-type landing gear. It provides better visibility from the flight deck, allows for more forceful application of the brakes and prevents ground-looping of the aircraft, keeping the airplane moving forward in a straight line.

Types of Aircraft Landing Gear Equipment & Servicing Tools


An aircraft tire bead breaker is used to break the bead or bond between a tire and wheel. It takes little effort and separates the two without damaging the expensive cast wheels. 


Efficient wheel transportation is crucial to keeping maintenance procedures moving while saving on unnecessary costs. An aircraft wheel dolly allows operators to transport wheels safely, easily and efficiently. 


Oxygen can have a negative reaction with rubber when used at higher altitudes. Because of this, nitrogen is used to inflate aircraft tires. The right aircraft nitrogen service tools are necessary to meet all pneumatic requirements. 


Proper aircraft maintenance and servicing are crucial to safety. So, it's important to utilize the right landing gear servicing tools in any maintenance routine and system. This will allow the staff to safely and efficiently service struts, brakes and tires. The following service tools are designed to help keep aircraft operating smoothly.


Aircraft brake service units are used to service an aircraft's braking system and test for brake pressure and potential bleeds. While being able to fly is important, it's equally critical to be able to stop. Any hangar or wheel and brake shop should be equipped with the following landing gear equipment.