United Kingdom military aircraft registration number, known as its serial number, or tail code is a specific

aircraft registration An aircraft registration is a code unique to a single aircraft, required by international convention to be marked on the exterior of every civil aircraft. The registration indicates the aircraft's country of registration, and functions much li ...

scheme used to identify individual

military aircraft A military aircraft is any Fixed-wing aircraft, fixed-wing or rotorcraft, rotary-wing aircraft that is operated by a legal or insurrectionary military of any type. Some military aircraft engage directly in aerial warfare, while others take on su ...

belonging to the

United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Northwestern Europe, off the coast of European mainland, the continental mainland. It comprises England, Scotlan ...

(UK). All UK military aircraft display a unique serial number, allocated from a unified registration number system, maintained by the Air Section of the

Ministry of Defence A ministry of defence or defense (see American and British English spelling differences#-ce.2C -se, spelling differences), also known as a department of defence or defense, is the part of a government responsible for matters of defence and Mi ...

(MoD Air). The same unified registration system is used for aircraft operated by the

Royal Air Force The Royal Air Force (RAF) is the Air force, air and space force of the United Kingdom, British Overseas Territories and Crown Dependencies. It was formed towards the end of the World War I, First World War on 1 April 1918, on the merger of t ...

(RAF),

Fleet Air Arm The Fleet Air Arm (FAA) is the naval aviation component of the United Kingdom's Royal Navy (RN). The FAA is one of five :Fighting Arms of the Royal Navy, RN fighting arms. it is a primarily helicopter force, though also operating the Lockhee ...

(FAA), and Army Air Corps (AAC). Military aircraft operated by government agencies and civilian contractors (for example

QinetiQ QinetiQ ( as in '' kinetic'') is a British defence technology company headquartered in Farnborough, Hampshire. It operates primarily in the defence, security and critical national infrastructure markets and run testing and evaluation capabili ...

AirTanker Services AirTanker Services Limited, incorporated in England and Wales on 14 June 2007 with the company registration number 06279646, is a private limited company in the United Kingdom (UK), which operates a British airline known as AirTanker , and is als ...

Babcock International Babcock International Group plc is a British aerospace, defence and nuclear engineering services company based in London, England. It specialises in managing complex assets and infrastructure. Although the company has civil contracts, its main b ...

) are sometimes also assigned registration numbers from this system. When the

Royal Flying Corps The Royal Flying Corps (RFC) was the air arm of the British Army before and during the First World War until it merged with the Royal Naval Air Service on 1 April 1918 to form the Royal Air Force. During the early part of the war, the RFC sup ...

(RFC) was formed in 1912, its aircraft were identified by a letter/number system related to the manufacturer. The prefix 'A' was allocated to balloons of No.1 Company,

Air Battalion The Air Battalion Royal Engineers (ABRE) was the first flying unit of the British Armed Forces to make use of heavier-than-air craft. Founded in 1911, the battalion in 1912 became part of the Royal Flying Corps, which in turn evolved into the Ro ...

Royal Engineers The Corps of Royal Engineers, usually called the Royal Engineers (RE), and commonly known as the ''Sappers'', is the engineering arm of the British Army. It provides military engineering and other technical support to the British Armed Forces ...

, the prefix 'B' to fixed-wing aeroplanes of No.2 Company, and the prefix 'F' to aeroplanes of the

Central Flying School The Central Flying School (CFS) is the Royal Air Force's primary institution for the training of military flying instructors. Established in 1912 at the Upavon Aerodrome, it is the longest existing flying training school in the world. The sch ...

(CFS).Bruce 1956, p.922 The Naval Wing used the prefix 'H' for

seaplane A seaplane is a powered fixed-wing aircraft capable of takeoff, taking off and water landing, landing (alighting) on water.Gunston, "The Cambridge Aerospace Dictionary", 2009. Seaplanes are usually divided into two categories based on their tech ...

s ('Hydroaeroplanes' as they were then known), 'M' for

monoplane A monoplane is a fixed-wing aircraft configuration with a single mainplane, in contrast to a biplane or other types of multiplanes, which have multiple wings. A monoplane has inherently the highest efficiency and lowest drag of any wing con ...

s, and 'T' for aeroplanes with engines mounted in

tractor configuration In aviation, a tractor configuration is a propeller-driven fixed-wing aircraft with its engine mounted with the propeller in front, so that the aircraft is "pulled" through the air. This is the usual configuration; the pusher configuration ...

. Before the end of the first year, a unified aircraft registration number system was introduced for both Army and Naval (

Royal Naval Air Service The Royal Naval Air Service (RNAS) was the air arm of the Royal Navy, under the direction of the Admiralty (United Kingdom), Admiralty's Air Department, and existed formally from 1 July 1914 to 1 April 1918, when it was merged with the British ...

) aircraft. The registration numbers are allocated at the time the contract for supply is placed with the

aircraft manufacturer An aerospace manufacturer is a company or individual involved in the various aspects of designing, building, testing, selling, and maintaining aircraft, aircraft parts, missiles, rockets, or spacecraft. Aerospace is a high technology industry. ...

or supplier. In an RAF or FAA pilot's personal service log book, the registration number of any aircraft flown, along with any other particulars, such as aircraft type, flight duration, purpose of flight, etc., is entered by the pilot after every flight, thus giving a complete record of the pilot's flying activities and which individual aircraft have been flown.

1 to 10000

The first military aircraft registrations were a series from 1 to 10000, with blocks allocated to each service. The first actual registration number was allocated to a Short S.34 for the

(RNAS), with the number 10000 going to a

Blackburn Blackburn () is an industrial town and the administrative centre of the Blackburn with Darwen borough in Lancashire, England. The town is north of the West Pennine Moors on the southern edge of the River Ribble, Ribble Valley, east of Preston ...

-built Royal Aircraft Factory B.E.2c aircraft in 1916.

A1 to Z9999

1916 Events Below, the events of the First World War have the "WWI" prefix. January * January 1 – The British Empire, British Royal Army Medical Corps carries out the first successful blood transfusion, using blood that has been stored ...

, the first sequence had reached 10000, and it was decided to start an

alpha-numeric Alphanumericals or alphanumeric characters are any collection of number characters and letters in a certain language. Sometimes such characters may be mistaken one for the other. Merriam-Webster suggests that the term "alphanumeric" may often ...

system, from A1 (allocated to a Royal Aircraft Factory BE.2d) to A9999, then starting again at B1. The letters A, B, C, D, E, F, H, and J were allocated to the Royal Flying Corps (RFC), and N1 to N9999 and S1 to S9999 to the Royal Naval Air Service (RNAS). When the sequence reached the prefix K, it was decided to start at K1000 for all subsequent letters instead of K1. Although the N and S series had earlier been used by RNAS aircraft, the sequence N1000 to N9999 was again used by the Air Ministry for both RAF and RN aircraft. The 'Naval' S sequence had reached only S1865, a

Fairey IIIF The Fairey Aviation Company Fairey III was a family of British reconnaissance biplanes that enjoyed a very long production and service history in both landplane and seaplane variants. First flying on 14 September 1917, examples were still in u ...

, but when R9999 was reached in

1939 This year also marks the start of the World War II, Second World War, the largest and deadliest conflict in human history. Events Events related to World War II have a "WWII" prefix. January * January 1 ** Coming into effect in Nazi Ger ...

, the next serial allocations did not run on from that point, but instead commenced at T1000. From

1937 Events January * January 1 – Anastasio Somoza García becomes President of Nicaragua. * January 5 – Water levels begin to rise in the Ohio River in the United States, leading to the Ohio River flood of 1937, which continues into Feb ...

, not all aircraft registration numbers were allocated, in order to hide the true number of aircraft in production and service. Gaps in the serial number sequence were sometimes referred to as 'blackout blocks'. The first example of this practice was an early 1937 order for two-hundred

Avro Manchester The Avro 679 Manchester was a British twin-engine heavy bomber developed and manufactured by the Avro aircraft company in the United Kingdom. While not being built in great numbers, it was the forerunner of the more famed and more successful ...

bombers; which were allotted the registration numbers L7276-7325, L7373-7402, L7415-7434, L7453-7497, L7515-7549, and L7565-7584, covering a range of 309 possible serial registration numbers, and thus making it difficult for an enemy to estimate true British military aircraft strength.

AA100 to ZZ999

1940 A calendar from 1940 according to the Gregorian calendar, factoring in the dates of Easter and related holidays, cannot be used again until the year 5280. Events Below, events related to World War II have the "WWII" prefix. January *Janu ...

, the registration number Z9978 had been allocated to a

Bristol Blenheim The Bristol Blenheim is a British light bomber designed and built by the Bristol Aeroplane Company, which was used extensively in the first two years of the Second World War, with examples still being used as trainers until the end of the war. ...

, and it was decided to restart the sequence with a two-letter prefix, starting at AA100. This sequence is still in use today. Until the 1990s, this two-letter, three-numeral registration number sequence, had numbers in the range 100 to 999. An exception to this rule was a Douglas Skyraider AEW1 which received the UK serial WT097, which incorporated the last three digits of its

US Navy The United States Navy (USN) is the naval warfare, maritime military branch, service branch of the United States Department of Defense. It is the world's most powerful navy with the largest Displacement (ship), displacement, at 4.5 millio ...

Bureau Number In the United States, all military aircraft display a serial number to identify individual aircraft. These numbers are located on the aircraft tail, so they are sometimes referred to unofficially as "tail numbers". On the Northrop Grumman B-2 Spi ...

124097. Recently, past unassigned registration numbers, including those having numerals 001-099, have been assigned. Some letters have not been used to avoid confusion: C could be confused with G, I confused with 1, O and Q confused with 0, U confused with V, and Y confused with X. During the

Second World War World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...

, RAF aircraft carrying secret equipment, or that were in themselves secret, such as certain military

prototypes A prototype is an early sample, model, or release of a product built to test a concept or process. It is a term used in a variety of contexts, including semantics, design, electronics, and software programming. A prototype is generally used to ...

, had a '/G' suffix added to the end of the registration number, the 'G' signifying 'Guard', denoting that the aircraft was to have an armed guard at all times while on the ground, examples include: W4041/G, the prototype Gloster E.28/39 jet powered by the Whittle jet engine; LZ548/G, the prototype

de Havilland Vampire The de Havilland DH100 Vampire is a British jet fighter which was developed and manufactured by the de Havilland, de Havilland Aircraft Company. It was the second jet fighter to be operated by the Royal Air Force, RAF, after the Gloster Meteo ...

jet fighter; or ML926/G, a

de Havilland Mosquito The de Havilland DH.98 Mosquito is a British twin-engined, multirole combat aircraft, introduced during the World War II, Second World War. Unusual in that its airframe was constructed mostly of wood, it was nicknamed the "Wooden Wonder", or " ...

XVI experimentally fitted with

H2S radar H2S was the first airborne radar system, airborne, Airborne ground surveillance, ground scanning radar system. It was developed for the Royal Air Force's RAF Bomber Command, Bomber Command during World War II to identify targets on the ground f ...

. As of

2009 2009 was designated as the International Year of Astronomy by the United Nations to coincide with the 400th anniversary of Galileo Galilei's first known astronomical studies with a telescope and the publication of Astronomia Nova by Joha ...

, registration number allocations have reached the ZKnnn range. However since about the year 2000, registration numbers have increasingly been allocated out-of-sequence. For example, the first Royal Air Force

Boeing C-17 Globemaster III The McDonnell Douglas/Boeing C-17 Globemaster III is a large military transport aircraft developed for the United States Air Force (USAF) between the 1980s to the early 1990s by McDonnell Douglas. The C-17 carries forward the name of two previ ...

was given the registration number ZZ171 in 2001, and a batch of

Britten-Norman Defender The Britten-Norman Defender is a multi-role utility transport aircraft, manufactured by Britten-Norman of the United Kingdom. It is the military version of the Britten-Norman Islander, developed for roles such as utility transport, casualty ev ...

s for the Army Air Corps (AAC) were given registration numbers in the ZGnnn range in 2003 (the last ZG serial being allocated more than 14 years previously). Also, some recent registration number allocations have had a numeric part in the previously-unused 001 to 099 range. Some aircraft are given registrations as an acknowledgement to their civilian type; specifically, the first

Airbus Voyager The Airbus A330 Multi Role Tanker Transport (MRTT) is a European aerial refueling and military transport aircraft based on the civilian Airbus A330. A total of 15 countries have placed firm orders for approximately 82 aircraft, of which 64 had ...

multi-role tanker transport is registered ZZ330 as a nod to the

Airbus A330 The Airbus A330 is a wide-body airliner developed and produced by Airbus. Airbus began developing larger A300 derivatives in the mid–1970s, giving rise to the A330 twinjet as well as the Airbus A340 quadjet, and launched both designs along ...

from which it is derived (with the remainder of the Voyager fleet in series to ZZ343).

'Maintenance' registration numbers

Distinct registration numbering systems are used to identify non-flying airframes, typically used for ground training. The RAF have used a numeric sequence with an 'M' suffix, sometimes referred to as the 'Maintenance' series. Known allocations, made between 1921 and 2000, ranged from 540M to 9344M, when this sequence was terminated. The main series of single letter registration numbers did not use 'M' to avoid confusion with the suffix 'M'. The Fleet Air Arm use an 'A'-prefixed sequence (e.g. A2606), and the Army Air Corps issue 'TAD' numbers to their instructional airframes (e.g. TAD015).

Display

The registration numbers are normally carried in up to four places on each aircraft; on either side of the aircraft (typically its

fuselage The fuselage (; from the French language, French ''fuselé'' "spindle-shaped") is an aircraft's main body section. It holds Aircrew, crew, passengers, or cargo. In single-engine aircraft, it will usually contain an Aircraft engine, engine as wel ...

) on a vertical surface, and on the underside of each

wing A wing is a type of fin that produces both Lift (force), lift and drag while moving through air. Wings are defined by two shape characteristics, an airfoil section and a planform (aeronautics), planform. Wing efficiency is expressed as lift-to-d ...

. The under-wing registration numbers, originally specified so that in case of unauthorised

low flying Low or LOW or lows, may refer to: People * Low (surname), listing people surnamed Low Places * Low, Quebec, Canada * Low, Utah, United States * Lo Wu station (MTR code LOW), Hong Kong; a rail station * Salzburg Airport (ICAO airport code: ...

, affected personnel could report the offending aircraft to the local police force, have not been displayed since the 1960s, as by then jet aircraft speeds at low level had made the likelihood of a person on the ground being able to read, and thus report them, increasingly remote. The registration number on each side is usually on the rear fuselage, but this can vary depending on the aircraft type, for instance the delta winged

Gloster Javelin The Gloster Javelin is a twin-engined all-weather interceptor aircraft designed and produced by the Gloster Aircraft Company. It was operated by the Royal Air Force from the mid-1950s until the late 1960s and was the final aircraft design to b ...

had the registration number on the forward engine nacelle, and the

Avro Vulcan The Avro Vulcan (later Hawker Siddeley Vulcan from July 1963) was a jet-powered, tailless, delta-wing, high-altitude, strategic bomber, which was operated by the Royal Air Force (RAF) from 1956 until 1984. Aircraft manufacturer A.V. Roe ...

had the registration number on its tail

fin A fin is a thin component or appendage attached to a larger body or structure. Fins typically function as foils that produce lift or thrust, or provide the ability to steer or stabilize motion while traveling in water, air, or other fluids. F ...

. Helicopters have only carried registration numbers on each side, either on the tail-boom or rear fuselage.

References

Citations

Bibliography

* * *, and other similar volumes covering all serial allocations from J1000 to XZ999. * * *{{cite magazine , first=R C , last=Sturtivant , url=http://www.FlightGlobal.com/pdfarchive/view/1955/1955%20-%201542.html , title=British Military Serial Numbers , date=21 October 1955 , magazine=Flight , pages=657–658 , archive-url = https://web.archive.org/web/20131112145834/http://www.flightglobal.com/pdfarchive/view/1955/1955%20-%201542.html , archive-date = 2013-11-12

External links

UK Serials Resource Centre
— United Kingdom military aircraft registrations resource
RAF Aircraft Serial Numbers
— query-able database from RAFCommands.com British military aircraft Military aircraft designation systems Aircraft markings Serial numbers