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.

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

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