Undercarriage arrangements
# 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.

| 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

| 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

| Aircraft | Wheels and Configuration | 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. 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

| Aircraft | Wheels and Configuration | 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 |
