A320 – Landing Gear System

Airbus 320 Bogie Landing gear has 4 wheels, while the Diabolo has 2 wheels.

Basic Operation of an Oleo-Pneumatic Strut in a Landing Gear:

An Oleo Strut is a Pneumatic air-oil hydraulic shock absorber used on the landing gear of most of the large aircraft. It is undesirable for an airplane to bounce on landing as it could lead to a loss of control, and could lead to structural damage to the landing gear. Hence the air in the Pneumatic Strut acts as shock absorber and the oil acts as a Damper Control.


On ground – The landing gear is in compressed position
In Air – The landing gear is in the extended position

The A320 landing gear system consists of:

  • One Nose Landing Gear:
    • They retract forward
    • Consists of the Nose Wheel Steering system
  • Two Main Landing Gears: 
    • They retract inboard
    • They are equipped with carbon brakes ( for efficient braking even at higher temperatures)
    • Consists of the Anti-skid and Auto-brake system

There are 2 wheels provided on each landing gear, making it total 6 wheels including all the landing gears.

The doors, which are fitted to the landing gear struts are operated mechanically and close at the end of gear retraction.

Operation of the Landing Gear

When the landing gear lever is selected to Down: The sequence valves make sure to open the landing gear doors first and then extend the landing gear, after the landing gears have been extended, then the doors close again to reduce drag and maintain a streamline flow.

When the landing gear lever is selected to Up: Again, the landing gear doors are opened first, once they are retracted fully, then only the landing gear doors close.

Two computers known as the Landing Gear Control And Interface Units (LGCIUS) control the extension and retraction of the gear and operation of the doors. There are two computers provided for the redundancy.

Source: Aibus

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Follow our TechTalks with Ria Maini and Kartik Bhatnagar, both commercial pilots, rated and endorsed on the A320. Although they recently stepped into their aviation career, nothing has stopped them from taking their knowledge to the next level, with successful experience in coaching on the subject of A320’s for aspiring pilots and a memory refresh for the experienced ones. Curiosity, passion for flying and avionics led them to start "A320 Trivia", and their endeavour has been to share their knowledge to benefit all aviation enthusiasts and pilots, and to highlight key dynamics of the versatile aircraft. You are welcome to share your valuable inputs and further enable this page, to be an expert guide/reference, polestar for all to follow. If you are interested in discovering new and mind boggling facts on the aircraft & technical general, catch up on our weekly blog!


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