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Undercarriage arrangements

Aircraft wheel configurations

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
[[File:Undercarriage Layouts Bogie 02.jpg]]	2 wheels, 1 axle	[[Image:A380-Undercarriage.JPG	thumb	center	[[Airbus A380]] nose landing gear (consisting of a single 2-wheel bogie)]]
[[Image:UndercarriageArrangements Bogie 03.jpg]]	4 wheels, 2 axles	[[Image:A7-ACA, Airbus A330-200 of Qatar Airways.jpg	thumb	center	An [[Airbus A330]]'s main landing gear (consisting of two 4-wheel bogies)]]
[[Image:UndercarriageArrangements Bogie 04.jpg]]	6 wheels, 3 axles	[[Image:Aa.b777-200er.n788an.mains.arp.jpg	thumb	center	A [[Boeing 777]]'s main landing gear (consisting of two 6-wheel bogies)]]
[[Image:UndercarriageArrangements Bogie 05.jpg]]	14 wheels, 7 axles	[[File:Antonov-225 main landing gear 2.jpg	thumb	center	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]	[[Image:Undercarriage Layouts FrontEnd 03.jpg]]	[[Image:Undercarriage Layouts Center 10.jpg]]	[[File:Antonov An-225 landing at Gostomel Airport.jpeg	thumb	center	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	Nose section	Center section	Example
A318, A319, A320, A321 (standard)	6 wheels
[1x2]+[2x2]	[[Image:Undercarriage Layouts FrontEnd 01.jpg]]	[[Image:Undercarriage Layouts Center 01.jpg]]	[[File:bmi a319-100 g-dbcf landing incloseup arp.jpg	thumb	center	An [[Airbus A319]] from [[BMI (airline)	bmi]]]]
A300, A310, A320, A330, A350-900	10 wheels
[1x2]+[2x4]	[[Image:Undercarriage Layouts FrontEnd 01.jpg]]	[[Image:Undercarriage Layouts Center 02.jpg]]	[[File:HVN_A350_F-WZFI!014_5jun15_LFBO.jpg	thumb	center	[[Airbus A350-900]] of [[Vietnam Airlines]]]]
A340-200/300	12 wheels
[1x2]+[2x4+1x2]	[[Image:Undercarriage Layouts FrontEnd 01.jpg]]	[[Image:Undercarriage Layouts Center 05.jpg]]	[[File:Kuwait airways a340-300 9k-anb landing arp.jpg	thumb	center	An [[Airbus A340-300]] from [[Kuwait Airways]]. Note the usage of an isolated 2-wheel unit in the central landing gear (similar to the [[McDonnell Douglas MD-11	MD-11]])	alt=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.]]
A340-500/600	14 wheels
[1x2]+[3x4]	[[Image:Undercarriage Layouts FrontEnd 01.jpg]]	[[Image:Undercarriage Layouts Center 06.jpg]]	[[File:Virgin Atlantic Airbus A340-600 (G-VWIN) arrives London Heathrow 31May2009 arp.jpg	thumb	center	[[Airbus A340-600]] of [[Virgin Atlantic]]]]
A350-1000	14 wheels
[1x2]+[2x6]	[[Image:Undercarriage Layouts FrontEnd 01.jpg]]	[[Image:Undercarriage Layouts Center 08.jpg]]	[[File:Qatar Airways Airbus A350-1000 (A7-ANA).jpg	thumb	center	[[Airbus A350-1000]] of [[Qatar Airways]]]]
A380	22 wheels
[1x2]+[2x4+2x6]	[[Image:Undercarriage Layouts FrontEnd 01.jpg]]	[[Image:Undercarriage Layouts Center 09.jpg]]	[[File:Airbus A380-800 (F-WWDD) overflies Filton Airfield (England) 18Jul2010 arp.jpg	thumb	center	[[Airbus A380]] in Airbus markings]]

Boeing

Aircraft	Wheels and
Configuration	Nose section	Center section	Example
717, 727, 737	6 wheels
[1x2]+[2x2]	[[Image:Undercarriage Layouts FrontEnd 01.jpg]]	[[Image:Undercarriage Layouts Center 01.jpg]]	[[File:Southwest Airlines Boeing 737-700 N231WN.jpg	thumb	center	A [[Boeing 737]] from [[Southwest Airlines]]]]
747	18 wheels
[1x2]+[4x4]	[[Image:Undercarriage Layouts FrontEnd 01.jpg]]	[[Image:Undercarriage Layouts Center 03.jpg]]	[[File:ba b747-400 g-civx maingeardetail arp.jpg	thumb	center	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]	[[Image:Undercarriage Layouts FrontEnd 01.jpg]]	[[Image:Undercarriage Layouts Center 02.jpg]]	[[File:Ba b757-200 g-bpei takeoff arp.jpg	thumb	center	A [[Boeing 757-200]] from [[British Airways]]]]
777	14 wheels
[1x2]+[2x6]	[[Image:Undercarriage Layouts FrontEnd 01.jpg]]	[[Image:Undercarriage Layouts Center 08.jpg]]	[[File:United Airlines B777-200 N780UA.jpg	thumb	center	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]	[[Image:Undercarriage Layouts FrontEnd 02.jpg]]	[[Image:Undercarriage Layouts Center 07.jpg]]	[[File:B-52 Stratofortress Takeoff.jpg	thumb	center	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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