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Below are featured the wheeled undercarriage (also called landing gear) arrangements of some modern commercial jet airliners and large military aircraft.

Types of wheeled units[edit]

This table shows the main types of individual, basic wheeled units (single-wheel unit or bogies composed of multiple wheels) used on most aircraft undercarriages.

Symbol Wheeled unit Example
2 wheels, 1 axle
Airbus A380 nose landing gear (consisting of a single 2-wheel bogie)
4 wheels, 2 axles
An Airbus A330's main landing gear (consisting of two 4-wheel bogies)
6 wheels, 3 axles
A Boeing 777's main landing gear (consisting of two 6-wheel bogies)
14 wheels, 7 axles
The Antonov An-225's main landing gear (consisting of two 14-wheel bogies)

The tables below show how various types of wheeled units are arranged to form the undercarriages of some popular aircraft from manufacturers Antonov, Airbus, and Boeing.

Antonov[edit]

Aircraft Wheels and
Configuration		 Nose section Center section Example
An-225 32 wheels
[2x2]+[2x14]
The Antonov An-225 with its 32-wheel landing gear. Note the front gear made of two independent, parallel 2-wheel bogies

Airbus[edit]

Aircraft Wheels and
Configuration		 Nose section Center section Example
A318, A319, A320, A321 (standard) 6 wheels
[1x2]+[2x2]
An Airbus A319 from bmi
A300, A310, A320, A330, A350-900 10 wheels
[1x2]+[2x4]
Airbus A350-900 of Vietnam Airlines
A340-200/300 12 wheels
[1x2]+[2x4+1x2]
An Airbus A340-300 from Kuwait Airways. The usage of an isolated 2-wheel unit in the central landing gear is unique to this aircraft and the DC-10-30.
An Airbus A340-300 from Kuwait Airways. Note the usage of an isolated 2-wheel unit in the central landing gear (similar to the MD-11)
A340-500/600 14 wheels
[1x2]+[3x4]
Airbus A340-600 of Virgin Atlantic
A350-1000 14 wheels
[1x2]+[2x6]
Airbus A350-1000 of Qatar Airways
A380 22 wheels
[1x2]+[2x4+2x6]
Airbus A380 in Airbus markings

Boeing[edit]

Aircraft Wheels and
Configuration		 Nose section Center section Example
717, 727, 737 6 wheels
[1x2]+[2x2]
A Boeing 737 from Southwest Airlines
747 18 wheels
[1x2]+[4x4]
A Boeing 747-400's main landing gear. Note the toes-up bias angle of the bogies on the wing gear, to ensure correct stowage upon retraction
707, 720, 757, 767, 787 10 wheels
[1x2]+[2x4]
A Boeing 757-200 from British Airways
777 14 wheels
[1x2]+[2x6]
A Boeing 777-200 from United Airlines. Using 6-wheel bogies, instead of the common 4-wheel bogies (reminiscent of earlier generation Tupolev Tu-154), was visionary for contemporary aircraft at the time of the design of the 777
B-52 Stratofortress 8 main wheels plus 2 outrigger wheels
[2x2]+[2x2]
A Boeing B-52 Stratofortress featuring its characteristic landing gear with 8 wheels under fuselage and two outrigger wheels near wingtips
source: https://en.wikipedia.org/wiki/Undercarriage_arrangements

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