Undercarriage arrangements

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

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.

SymbolWheeled unitExample
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
An impressive, and unique of its kind, Antonov An-225's 14-wheel bogie from the plane'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

AircraftWheels and
Configuration
Nose sectionCenter sectionExample
An-22532 wheels
[2x2]+[2x14]
The Antonov An-225 with its impressive 32-wheel landing gear. Note the front gear made of two independent, parallel 2-wheel bogies

Airbus

AircraftWheels and
Configuration
Nose sectionCenter sectionExample
A318, A319, A320, A321 (standard)6 wheels
[1x2]+[2x2]
An Airbus A319 from bmi
A300, A310, A320, A33010 wheels
[1x2]+[2x4]
A340-200/30012 wheels
[1x2]+[2x4+1x2]
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)
A340-500/60014 wheels
[1x2]+[3x4]
Airbus A340-600 of Virgin Atlantic
A350-90010 wheels
[1x2]+[2x4]
Airbus A350-900 of Vietnam Airlines
A350-100014 wheels
[1x2]+[2x6]
A38022 wheels
[1x2]+[2x4+2x6]
Airbus A380 in Airbus markings

Boeing

AircraftWheels and
Configuration
Nose sectionCenter sectionExample
717, 727, 7376 wheels
[1x2]+[2x2]
74718 wheels
[1x2]+[4x4]
A Boeing 747-400's main landing gear. Note the toes-up bias angle of the bogies/trucks on the wing gear, to ensure correct stowage upon retraction
757, 76710 wheels
[1x2]+[2x4]
77714 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
787 Dreamliner10 wheels
[1x2]+[2x4]
A factory Boeing 787 Dreamliner
B-52 Stratofortress8 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
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