List of Air Ministry specifications

This is a partial list of the British Air Ministry specifications for aircraft. A specification stemmed from an Operational Requirement, abbreviated "OR", describing what the aircraft would be used for. This in turn led to the specification itself, e.g. a two-engined fighter with 4 machine guns. So for example, OR.40 for a heavy bomber led to Specification B.12/36. Aircraft manufacturers would be invited to present design proposals to the Ministry, following which prototypes of one or more of the proposals might be ordered for evaluation. On very rare occasions, a manufacturer would design and build an aircraft using their own money as a "Private Venture". This would then be offered to the Ministry for evaluation. If the aircraft generated interest in the Ministry or RAF due to performance or some other combination of features then the Ministry might well issue a specification based on the Private Venture aircraft.
The system of producing aircraft to a specification ran from 1920 to 1949 during which the Air Ministry was replaced by first the Ministry of Aircraft Production in 1940 and then the Ministry of Supply in 1946. The system was applied to commercial aircraft as well, two being the de Havilland Comet and Vickers Viscount. During the period, over 800 specifications were issued.

Specification designations

Each specification name usually followed a pattern. A leading letter was usually present to identify the aircraft purpose. The codes used included B for "heavy bomber", e.g., B.12/36, P for "medium bomber", e.g., P.13/36, F for "fighter", e.g., F.10/35, and A for "army co-operation", e.g., A.39/34. The second part was a number identifying it in sequence and then after the slash, the year it was formulated, so in the example given above, B.12/36 signifies a specification for a heavy bomber, the twelfth specification of all types issued in 1936. Specifications were not always issued in sequence.
Admiralty specifications were identified by the letter N, e.g., N.21/45, and experimental specifications identified by the letter E, e.g., E.28/39, with training aircraft signified by the letter T, e.g., T.23/31, and unpowered aircraft, signified by the letter X, e.g., X.26/40. The letter G signified a general-purpose aircraft, e.g., G.9/45, with an M being applied to aircraft intended for more than one specific purpose, e.g., M.15/35.
The letter C was applied to military transport aircraft, e.g., C.1/42, with the letter O used for a naval reconnaissance aircraft, e.g., O.8/38 – the letter S used for the more specialised role of naval spotting, i.e., observing and reporting back the fall of naval gunfire, e.g., S.38/34 – and R for a reconnaissance type – often a flying boat, e.g., R.3/33. Special purpose aircraft would be signified by a letter Q, this being used to specify aircraft such as target-tugs, radio-controlled target drones, etc., e.g., Q.32/55.
Sometimes the purpose for which an aircraft is used in service would change from that for which the specification to which it was designed was issued, and so there are some discrepancies and inconsistencies in designation, the Royal Navy in particular liking to specify multiple roles for its aircraft in an attempt to make the best use of the necessarily limited hangar space onboard its aircraft carriers. In this case this resulted in several types designed to specifications originally intended to signify the naval Spotting role also being used for other purposes, e.g., S.15/33, resulting in the Blackburn Shark and Fairey Swordfish, the latter aircraft being primarily utilised as a torpedo bomber. Similarly S.24/37, which produced the Fairey Barracuda, again primarily designed for spotting, the dive bomber/torpedo bomber requirements being regarded as secondary when the specification was issued, but for which roles it was almost exclusively subsequently used, the original spotting requirement having been made obsolete with the introduction of radar.
In addition, some specifications appear to have no letter prefix at all, e.g., 1/21, the Vickers Virginia III.

List of specifications (incomplete)

The names of the aircraft shown in the table are not necessarily those they carried when provided for evaluation as at this point an aircraft would usually be referred-to as the Manufacturer X.XX/XX, e.g., the Avro B.35/46 – this is in addition to the manufacturer's own separate internal designation for the aircraft, e.g., Avro 698. With several manufacturers submitting designs to the same specification this could result in a number of different aircraft with the same X.XX/XX designation, e.g., Handley Page B.35/46, etc. Upon acceptance of the design the final service names would usually be chosen by the Air Ministry when they placed a production order, in the above B.35/46 cases, where two aircraft were accepted to this specification, Vulcan and Victor respectively.
Upon entering service, in the absence of any already-planned variants a new type would initially have no Mark Number after the aircraft name, being simply referred to as the Manufacturer Service-name, e.g., the Avro Anson, however upon acceptance of a new variant the previous version automatically became the 'Mark I', so in the example given, the previous version of the Anson retrospectively became the Avro Anson Mk I upon acceptance of an Avro Anson Mk II. Sometimes planned variants would be later cancelled leading to 'missing' Mark Numbers, or the extent of the changes may have justified given the new variant a completely new name, e.g., the Hawker Typhoon II subsequently becoming the Hawker Tempest, or the Avro Lancaster B.IV & B.V entering service as the Avro Lincoln. In a few cases the same aircraft ordered with differing engines would be allocated separate names for each variant, e.g., Hawker Typhoon and Hawker Tornado, or the Handley Page Hampden and Handley Page Hereford. Typographical designation of Mark Numbers varied over time and inconsistencies are common, e.g., Mark II, Mk. II, II, etc. Initially Roman numerals were used, changing to Arabic numerals post-World War II, e.g., Supermarine Spitfire Mk I to Supermarine Spitfire Mk 24.
Note 1: where possible Mark Numbers are given here in this list in the form that was used at the time of acceptance. Variations may be encountered due to changes in format/typographical convention.
Note 2: due to mergers and amalgamations within the UK aircraft industry sometimes the name of the manufacturer changed over time, e.g., English Electric later became part of the British Aircraft Corporation, so the English Electric Lightning then became the BAC Lightning; the British Aircraft Corporation itself and Hawker Siddeley then later merged and became British Aerospace, subsequently becoming BAe. Thus the previously mentioned Avro Vulcan was subsequently referred-to as the Hawker Siddeley Vulcan; similarly, the Blackburn Buccaneer later became the Hawker Siddeley Buccaneer. Where possible, for clarity the aircraft in this list are listed under the ORIGINATING company's name or the name of the manufacturer under which it first entered production.
Specifications within the tables are listed in numerical order by year of issue; where a given number appears more than once, with one or more letter prefixes, the entries are presented in alphabetical order.

Air Board Specifications (1917–1918)

In 1917, the Air Board began to issue specifications for new aircraft on behalf of the Royal Flying Corps and Royal Navy Air Service, with separate series for the RFC and Navy.

Spec	Type	Designs
A.1A	Single-seat fighter – Sopwith Camel replacement	Austin Osprey, Boulton & Paul Bobolink, Nieuport B.N.1, Sopwith Snipe
A.1C	Single-seat fighter – ABC Dragonfly engine, became RAF Type I specification.	Nieuport Nighthawk
A.2B	Single- or twin-engined day bomber	Airco DH.10
A.3C	Heavy bomber – superseded by RAF Type V	Abandoned

Spec	Type	Designs
N.1A	Single seat land or ship-based fighter.	Beardmore W.B.IV, Beardmore W.B.V, Mann Egerton Type H
N.1B	Single-seat seaplane or flying boat fighter	Blackburn N.1B, Norman Thompson N.1B, Supermarine Baby, Westland N.1B, Wight Triplane Flying Boat
N.1B	Single seat torpedo bomber	Blackburn Blackburd, Short Shirl
N.2A	Two-seat floatplane scout	Fairey N.9, Fairey N.10, Short N.2A
N.2B	Two-seat floatplane bomber, bombload.	Fairey IIIB, Short N.2B
N.2C	Twin engined patrol flying boat	Norman Thompson N.2C

RAF Specifications (1918–1920)

Spec	Type	Designs
Type I	Fighter, ABC Dragonfly engine.	Armstrong Whitworth Ara, BAT Basilisk, Nieuport Nighthawk, Siddeley Siskin, Sopwith Snapper, Sopwith Snark
Type IA	Long-distance	BAT Bantam, Westland Wagtail
Type II	Two-seat fighter	Bristol Badger
Type III	Two-seat fighter	Austin Greyhound, Westland Weasel
Type IV Type VI	Twin-engined bomber	Avro 533 Manchester, Boulton Paul Bourges, de Havilland Oxford, Sopwith Cobham
Type VII	Night Bomber	Nieuport London
Type VIII	Bomber	Avro 533 Manchester, Boulton Paul Bourges, Bristol Braemar, de Havilland Oxford, Sopwith Cobham
Type IX	Medium bomber	de Havilland Okapi
Type XI	Heavy bomber	Siddeley Sinaia
Type XX		Gloster Nightjar
Type XXI	Two-seat amphibian fighter	Bristol Type 35, Fairey Pintail
Type XXII	Single-seat carrier based torpedo bomber	Blackburn Blackburd, Short Shirl, 'Blackburn Swift'
Type XXX	Flying boat	Short Cromarty, Vickers Valentia
Type XXXII	Prototype training seaplane	– Short Sporting Type produced to this specification
Type XXXIII	Four-engined long range flying boat	Fairey N.4

1920–1929

Spec	OR	Type	Designs
1/20	-	First spec. issued: spares carrier	Bristol Type 37 Tramp
2/20		'Interim' single-engine heavy bomber	Avro Aldershot, de Havilland DH.27 Derby
3/20		Single-seat deck-landing torpedo-carrier – Spec. superseded by 32/22	Blackburn Dart, Handley Page H.P.19 Hanley
4/20		Long-distance photographic and reconnaissance aeroplane	Boulton & Paul Bolton
5/20		Troop Carrier Biplane	Bristol Type 56, Vickers Victoria
6/20		Vimy Ambulance	Vickers Vimy Ambulance
7/20		Fleet reconnaissance and fleet spotting amphibian	Supermarine Seagull
8/20		3-seat reconnaissance aircraft for Army/Navy	Armstrong Whitworth Tadpole, Westland Walrus
9/20		Medium range postal monoplane	Parnall Possum, Boulton & Paul Bodmin
10/20		Cantilever monoplane	de Havilland Doncaster
11/20			Parnall Possum, Boulton & Paul Bodmin
1/21		Long-range bomber – Vickers Vimy replacement	Vickers Virginia III
2/21		Experimental single-seat convertible biplane/monoplane fighter/interceptor/two-seat reconnaissance-fighter aircraft – written for Bullfinch	Bristol Bullfinch
3/21		Naval Fleet spotter/reconnaissance aircraft	Avro Bison, Blackburn Blackburn
4/21		Small troop carrier	Vickers Vernon
5/21		Light day bomber – Airco DH.9A replacement	Fairey Fawn
6/21		Postal aeroplane	Westland Dreadnought
7/21			Parnall Plover
8/21		Torpedo Aeroplane	Blackburn T.4 Cubaroo
9/21		Torpedo Aeroplane	Blackburn Dart production
10/21		Corps reconnaissance aircraft	Armstrong Whitworth Wolf, Hawker Duiker
11/21		Vimy ambulance	Vickers Vimy ambulance
12/21		Fleet spotting flying boat	English Electric Ayr
13/21			Handley Page H.P.20
14/21		Felixstowe F.5 replacement	Supermarine Scylla
13/21		Cantilever monoplane	Handley Page H.P.20
14/21		Boat seaplane	Supermarine Scylla
15/21		Twin-engined bomber	Boulton & Paul P.19
16/21		Biplane transport	Handley Page W.8b
17/21		Biplane transport	Handley Page Type X, de Havilland DH.34
18/21		Passenger transport	Handley Page HP.18 Hanley / Handley Page HP.21 Hanley, de Havilland DH.32, Vickers Type 61 Vulcan
19/21		Two-seat reconnaissance aircraft – Bristol F.2B Fighter replacement	Short Springbok
20/21		High-altitude fighter	cancelled
21/21		Spotting amphibian	Supermarine Seagull II
22/21		Reconditioned F.2b	Bristol F.2b Fighter
1/22			Vickers Type 170 Vanguard
2/22			Vickers Viking V
3/22		Two-seat fighter/reconnaissance powered by a supercharged engine – Bristol Fighter replacement	Bristol Type 84 Bloodhound
4/22		Reconditioning of DH.10	Airco DH.10 Amiens
5/22		Spare wing	de Havilland DH.29 Doncaster
6/22		Naval carrier fighter with interchangeable wheel & float undercarriages using Armstrong Siddeley Jaguar or Bristol Jupiter engine – Nieuport Nightjar replacement	Fairey Flycatcher, Parnall Plover
7/22		Army reconnaissance aircraft	Hawker Duiker
8/22		Corps reconnaissance aircraft	Armstrong Whitworth Wolf
9/22		New tail unit and trial	de Havilland DH.29 Doncaster
10/22		Metal-winged DH.9a	Airco DH.9a
11/22		Reconditioning of DH.9a	Airco DH.9a
12/22		Single-engined goods carrier	Vickers Type 63 Vulcan
13/22		Reconditioning of Snipe	Sopwith Snipe
14/22		High performance landplane	Armstrong Whitworth Siskin III
15/22		Modifications to Hanley	Handley Page HP.19 Hanley II
16/22		Long range Torpedo Bomber to carry 21 inch torpedo	Blackburn Cubaroo, Avro 557 Ava
17/22		Amphibian floatplane	Not proceeded with
18/22		Amphibian seaplane	Not proceeded with
19/22		Night bombing landplane	Not proceeded with
20/22		Coast patrol seaplane	English Electric P.5 Cork
21/22		Twin-engined amphibian flying boat for civil operations – see also R.18/24	Supermarine Swan
22/22		Two-seat fighter/reconnaissance powered by a supercharged engine – Bloodhound three aircraft order – revised from 3/22	Bristol Type 84 Bloodhound
23/22		Amphibian floatplane	Not proceeded with
24/22		Amphibian seaplane	Not proceeded with
25/22		Single-seat night interceptor fighter	Hawker Woodcock
30/22			Boulton & Paul Bugle
B.30/22		Heavy bomber – written for Bugle II production order but Sidestrand also apparently designed to this spec.	Boulton & Paul Bugle II, Boulton Paul Sidestrand
31/22		4-seat heavy night-bomber	Handley Page Hyderabad
32/22		Single-seat deck-landing torpedo-carrier – Spec. supersedes 3/20	Blackburn Dart II, Bristol Brandon
37/22		Three-seat deck landing reconnaissance aircraft – Blackburn Blackburn / Avro Bison replacement	Avro Type 550, Blackburn Airedale, Hawker Hedgehog
38/22		General Purpose seaplane/landplane	Fairey IIID
40/22		Transport aeroplane – civil airliner – larger version of de Havilland DH.34	de Havilland Highclere
41/22		'Middle East type transport aeroplane' – civil airliner	Armstrong Whitworth Argosy, de Havilland Hercules
43/22			Vickers Vernon II
44/22		Single-engined long-range reconnaissance seaplane – intended for round-the-World flight	Fairey Fremantle
46/22		Three-seat fleet-spotter amphibian	Vickers Vanellus
9/23		Superseded by 14/24	Blackburn Iris
13/23			Supermarine Seagull II
16/23	-	Spotting ship-plane	Avro Bison
19/23		Fighter/interceptor – improved Siskin III	Armstrong Whitworth Siskin IIIA
21/23		Fleet two-seat torpedo bomber	Avro Buffalo, Blackburn Ripon, Handley Page H.P.31 Harrow
23/23		Coastal patrol and anti-submarine flying-boat	English Electric Kingston
25/23		Fleet two-seat torpedo bomber/bomber	Handley Page H.P.25 Hendon
26/23		Two-seat long-range day-bomber	Bristol Berkeley, Handley Page H.P.28 Handcross, Hawker Horsley, Westland Yeovil
28/23		Long-range bomber – Virginia production order	Vickers Virginia
37/23		Single-engined fighter/interceptor – improved Grebe	Gloster Gamecock
1/24		Three-seat fleet reconnaissance seaplane and amphibian	Parnall Pike, Short S.6 Sturgeon, Bristol Type 87
2/24		Light Aeroplane	Cancelled
3/24		Single-seat high-performance landplane	Hawker Woodcock II
4/24		"Twin-Engined Home Defence Fighter" armed with two 37 mm cannons	Westland Westbury Bristol Bagshot
5/24		Advanced landplane, convertible to a seaplane, trainer for RAF and deck-landing trainer for FAA	Cancelled, replaced by 5A/24
5A/24		Floatplane trainer	Vickers Vendace, Blackburn Sprat, Parnall Perch
6/24		Single-seat fighter	Fairey Flycatcher
7/24		'High Powered Single-Seater Fighter Landplane'	Avro Avenger, Fairey Firefly I, Fairey Fox, Gloster Gorcock, Hawker Hornbill
8/24		Army co-operation aircraft	de Havilland Dingo
9/24		Twin engine medium day-bomber – Sidestrand II production order – see also 25/27	Boulton Paul Sidestrand II
10/24		Fleet spotting ship-plane	Blackburn Blackburn
11/24		Fleet spotting ship-plane	Avro Bison II
12/24		Long-range bomber – Virginia production order	Vickers Virginia
13/24		Patrol flying boat	Blackburn Iris III, Short Singapore
14/24		Three-engined boat seaplane	Blackburn Iris, Saunders Valkyrie
15/24		4-seat heavy night-bomber – initial production batch of Hyderabads	Handley Page Hyderabad I
16/24		Submarine-borne reconnaissance seaplane	Parnall Peto
17/24		Single-seat high-speed fighter landplane	Gloster Guan
18/24		Twin-engined amphibian flying boat – military version of boat ordered to 21/22	Supermarine Southampton
19/24		Three-seat Spotter/Reconnaissance /two-seat GP aircraft with interchangeable land & float U/C & folding wings	Fairey IIIF
20/24		All-metal monoplane flying boat	Beardmore Inverness
21/24		Single-seat boat seaplane for storage in restricted space	Parnall Prawn
22/24		Three-engine boat seaplane	Saunders Valkyrie
23/24		Twin engine civil airliner	Handley Page H.P.32 Hamlet
24/24		Conversion of Bison I to Bison Ia	Avro Bison
25/24		Single-seater, high-speed fighter landplane	Hawker Heron
26/24		Three-engined land-plane for duties in the Middle East	Cancelled
27/24		Twin engine single-seat interceptor/night fighter	Boulton Paul Bittern
28/24		Day and night fighter – Armstrong Whitworth Siskin replacement	Armstrong Whitworth Starling
29/24		Twin-engined boat amphibian with Lynx engines	Supermarine Seamew
30/24		Two-seat reconnaissance/army co-operation aircraft	de Havilland Hyena, Short Chamois, Vickers Vespa
31/24		Twin-engined boat amphibian with Lynx engines	Saunders Medina
32/24		Training landplane with Lynx engines – replaced by 3/27	Avro 504N
33/24		Three-engined boat seaplane for civil use	Not issued
34/24		Freight carrying landplane	Vickers Vellore, Gloucester Goodwood
35/24		Three-engine landplane for Middle East transport	Armstrong Whitworth Argosy
11/25		Reconnaissance Flying Boat	Supermarine Southampton
12/25		Two-seater Fleet Reconnaissance Aircraft	Cancelled
13/25		Troop Carrier	Vickers Victoria III
14/25		Demonstration Flight of Cierva Autogiro	Cierva C.6A
17/25		Naval single-seater fighter of all-metal stressed-skin construction with interchangeable wheel and float U/C powered by Lynx engine	Avro 584 Avocet, Vickers Vireo
20/25		Army co-operation aeroplane – Bristol Fighter/DH.9A replacement	Armstrong Whitworth Atlas, Bristol Boarhound
23/25		Two-seat day-bomber, reconnaissance & coastal torpedo-bomber	Blackburn Beagle, Gloster Goring, Handley Page H.P.34 Hare, Hawker Harrier, Westland Witch
24/25		High altitude bomber – Hawker Horsley replacement	Blackburn Beagle, Handley Page H.P.34 Hare, Vickers Vildebeest
7/26		Twin-float high-speed monoplane seaplane for 1927 Schneider Trophy competition	Short Crusader
F.9/26	-	Day and night 'zone' fighter – no design accepted and Spec. superseded by F.20/27	Armstrong Whitworth Starling II, Blackburn Blackcock / Turcock, Boulton Paul Partridge, Bristol Bulldog Mk.I, Bristol Bullpup, Gloster Goldfinch, Gloster SS.18, Hawker Hawfinch, Vickers Type 141
10/26		Long-range bomber – Virginia production order	Vickers Virginia
12/26		Fast two-seat day bomber of all-metal construction using Rolls-Royce F.XIB engine	Avro Antelope, Hawker Hart, Fairey Fox IIM
14/26		Passenger flying boat	Short Calcutta
21/26		Naval Fleet fighter – see also N.21/26	Parnall Pipit, Vickers Type 141, Vickers Type 177
N.21/26		Naval Fleet fighter – see also 21/26	Armstrong Whitworth Starling II, Armstrong Whitworth A.W.16, Blackburn Blackcock/Turcock, Fairey Firefly III, Gloster Gnatsnapper, Hawker Hoopoe, Vickers Type 177
O.22/26		Naval high-speed, two-seat, Fleet fighter/reconnaissance	Blackburn Nautilus, Fairey Fleetwing, Handley Page H.P.37F, Hawker Osprey, Short Gurnard
R.4/27		Maritime patrol flying boat	Saunders Severn
R.5/27		Reconnaissance flying boat	Blackburn Sydney
8/27		Long-range bomber – Virginia production order	Vickers Virginia
F.10/27		Single-seat fighter armed with six machine guns	Saunders A.10
B.19/27		Twin engine night-bomber – Virginia/Hinaidi replacement – Hendon winner but introduction delayed so runner-up accepted	Avro 557 Ava, Fairey Hendon, Handley Page Heyford, Vickers Type 150, Vickers Type 163, Vickers Type 195, Vickers Type 225, Bristol Type 108
C.20/27		Transport version of Handley Page Hyderabad / Handley Page Hinaidi – Chitral/Clive	Handley Page Clive
F.20/27		'Interception single-seat fighter'	Armstrong Whitworth Starling II, Bristol Bulldog Mk.II, de Havilland DH.77, Fairey Firefly II, Hawker Fury, Saunders A.10, Vickers Jockey, Westland Interceptor
B.22/27		Three engine night-bomber – abandoned due to delays and replaced by B.19/27	Boulton Paul P.32, de Havilland DH.72 Canberra
25/27		Twin engine medium day-bomber – Sidestrand II production order – see also 9/24	Boulton Paul Sidestrand II
26/27		General purpose aircraft – D.H.9A replacement	Bristol Beaver, de Havilland Hound, Fairey Ferret, Gloster Goral, Vickers 131 Valiant, Vickers Venture, Vickers Vixen, Westland Wapiti
F.29/27		Fighter utilizing a 37 mm cannon from Coventry Ordnance Works	Vickers Type 161, Westland C.O.W. Gun Fighter, Bristol Type 112
33/27		'Postal Aircraft' – experimental very-long range aeroplane for world distance-record attempt	Fairey Long-range Monoplane
M.5/28		Torpedo bomber – Spec superseded by M.1/30	Handley Page H.P.41
R.6/28		Patrol/reconnaissance flying boat	Short Sarafand
8/28		Racing seaplane for 1929 Schneider Trophy using Rolls-Royce R engine, for use by RAF High Speed Flight	Supermarine S.6
13/28		Long-range bomber – Virginia production order	Vickers Virginia
C.16/28		Bomber-transport capable of carrying 30 fully armed troops, or their equivalent in cargo or bombs, for a distance of nonstop	Gloster TC.33, Handley Page H.P.43, Vickers Type 163, Bristol Type 115, Bristol Type 116
F.17/28		Bulldog II production order	Bristol Bulldog Mk.II
21/28		High-speed mailplane for Imperial Airways	Boulton & Paul Mailplane, Boulton Paul P.71A
1/29		General purpose aircraft	Westland Wapiti
2/29		Two-seat carrier-borne torpedo-bomber	Blackburn Ripon IIA
3/29		Troop transport aircraft	Handley Page Clive II
4/29		Ab initio trainer – Moth with de Havilland Gipsy I order	de Havilland Gipsy Moth
5/29		Elementary trainer	Hawker Tomtit
6/29		General purpose landplane	Blackburn C.A.15C, Boulton & Paul P.42, Westland Limousine V
7/29		Troop carrying aeroplane	Vickers Victoria V
8/29		Single-seat fighter	Armstrong Whitworth Siskin IIIA
9/29		Day bomber	Hawker Hart
10/29		Medium day-bomber	Boulton Paul Sidestrand III
11/29		Day and night fighter	Bristol Bulldog IIA
12/29		Spotter reconnaissance aeroplane for the Fleet Air Arm	Fairey IIIF
13/29		Heavy night-bomber	Handley Page Hinaidi II
14/29		Army co-operation aircraft	Cancelled
15/29		General purpose aircraft	Cancelled
16/29		Experimental tailless aircraft	Westland-Hill Pterodactyl IV
17/29		All-metal torpedo-bomber	Hawker Horsley
18/29		General reconnaissance flying boat – military version of Short S.8 Calcutta	Short Rangoon

1930–1939

1940–1949

Post 1949 Specifications. Air Staff Operational Requirements/Targets

Spec	OR	Year	Type	Related aircraft
ER.100		1950	Experimental low-speed research version of English Electric P.1	Short SB.5
M.101		1950	Three-seat anti-submarine aircraft	Fairey Firefly AS.7
ER.103		1947	Experimental research aircraft capable of Mach 1.5 at 36,000 ft – modified for P.1 as F.23/49	English Electric P.1, Fairey Delta 2
B.104	OR.285			Vickers Valiant B.2
F.105D				Supermarine 545
N.107				de Havilland Sea Venom FAW.22
UB.109		1951	Expendable Bomber	Bristol Type 182
ER.110T		1952	Variable sweepback research monoplane	Bristol Type 183
N.113D&P			Supermarine N.9/47 Development and Production	Supermarine Type 544 Scimitar F.1
N.114			All-weather Naval Fighter
F118D, F118P		c. 1953	All-weather fighter	"Super Javelin" Gloster Javelin with new wing. Gloster GA.6/P.356
F.124T		1949	Rocket fighter	Bristol Type 178
EH.125				Percival P.74
B.126T		1952	Low-level bomber	Bristol Type 186
H.127				Westland-Sikorsky WS-55
HCC.127				Whirlwind helicopter for Queens Flight
C.132	OR.315			Vickers V.1000
F.137D				Avro 720
F.138D		1953	Mixed rocket-jet interception fighter – written around SR.53	Saunders-Roe SR.53
F.139				de Havilland Sea Vixen FAW.1
RH.142	OR.334	195?	VTOL transport aircraft	Fairey Rotodyne; later cancelled
ER.143		~1953	Experimental direct jet-lift VTOL research aircraft	Short SC.1
HR.144			Ultra Light Helicopter	Fairey ULH
HR.146			Development of Bristol 173 for the Royal Navy. Cancelled in favour of Westland Wessex.	Bristol Type 191 for the Royal Navy
M.148	N.A.39			Blackburn Buccaneer S.1
HR.149			Development of the Bristol 173 for Royal Canadian Navy	Bristol Type 193
H.150			Development of the Bristol 191 for the Royal Air Force	Bristol Type 192 as the Westland Belvedere HC.1
F.153D		1955	All weather fighter	"Thin Wing Gloster All Weather Fighter". Updating of F.118. Gloster P.376
F.155T		1955	High-altitude fighter	English Electric P.8
R.156T		1955	Mach 3 reconnaissance aircraft	English Electric P.10
RB.156T			Reconnaissance-bomber	Avro 730
ER.163		195?	Experimental Fairey Delta 2 with de Havilland Gyron engine – later cancelled	Fairey Delta 2
ER.204D		195?	Experimental VTOL aircraft using Bristol Pegasus	Hawker P.1127
	OR.301	February 1952	Rocket propelled interceptor	Saunders Roe SR.53, Avro 720
	OR.303	195?	Lightweight fighter to intercept Soviet Tupolev Tu-4 bombers	Folland Midge
	OR.304	195?	Helicopter for RAF Coastal Command	Bristol Sycamore
	OR.323	195?	Transport aircraft – Hastings replacement	Armstrong Whitworth AW.660 Argosy, Aviation Trader ATL-95, Avro Type 733, Blackburn B-104, English Electric P.14, Shorts PD.16, Vickers Type 799
B.126T	OR.324	1952	Low-level bomber – Spec. B.126T written to this OR – cancelled 1954	Avro 721, Handley Page H.P.99 – proposals also tendered by: Bristol, Shorts & Vickers.
F.155	OR.329	1955?	Supersonic high flying interceptor	Fairey "Delta III"; cancelled 1957
	OR.330	1954	Supersonic high flying reconnaissance aircraft	Avro 730, Handley Page HP.100
RH.142	OR.334	195?	VTOL transport aircraft	Fairey Rotodyne; later cancelled
	GOR.339	1956	STOL Tactical-Strike/Reconnaissance aircraft capable of Mach 2 and suitable for operation from unpaved strips – Canberra replacement	BAC TSR-2; later cancelled
FGA.236	GOR.345	195?	V/STOL combat aircraft version of Hawker P.1127 – Harrier development	Hawker Siddeley Kestrel FGA.1
	OR.350	18 July 1960	Maritime patrol aircraft to enter service by 1968	Nimrod MR.1
	OR.351	1960	V/STOL freighter	English Electric P.36
	OR.356	19??	Supersonic V/STOL – Spec. SR.250	Hawker Siddeley P.1154; later cancelled
	OR.357	19??	Maritime reconnaissance aircraft – led to Nimrod	Hawker Siddeley Nimrod
	OR.362	19??	Supersonic trainer aircraft – led to Jaguar	SEPECAT Jaguar
	ASR.365	196?	Helicopter – Tactical Support	Westland Puma
	ASR.367	196?	Bomber – Vulcan B.2 – see also B.35/46	Avro Vulcan B.2
	ASR.368	196?	Bomber – Victor B.2 – see also B.35/46	Handley Page Victor B.2
	ASR.371	196?	Transport aircraft	Short Belfast
	ASR.372	196?	Trainer version of Lightning – Lightning T.5	English Electric Lightning T.5
	ASR.373	196?	VIP Transport aircraft – Andover CC.2	Hawker Siddeley Andover CC.2
	ASR.376	196?	Tanker aircraft	Handley Page Victor B.1 / Handley Page Victor B.1A
	ASR.378	196?	Transport aircraft – VC10	Vickers VC10
	ASR.381	196?	Interim Maritime Patrol aircraft to Spec. MR.254 – written around Atlantique	Breguet Atlantique
	ASR.382	196?	Two-seat trainer version of P.1154 for RAF – cancelled	Hawker Siddeley P.1154
	ASR.384	196?	Harrier requirement – see also GOR.345	Hawker Siddeley Harrier
	ASR.385	196?	Phantom for RAF	McDonnell Douglas F-4M Phantom II
	ASR.397	1970	Basic jet trainer – BAC Jet Provost replacement	BAE Systems Hawk T.1
	ASR.400		Airborne Early Warning Aircraft	Hawker Siddeley Nimrod AEW.3
	ASR.409		Harrier replacement	BAe/McDonnell Douglas AV-8B Harrier GR.5
T.301	AST.412		Jet Provost replacement	Short Tucano T.1
	GOR.2	1959	VTOL Strike Reconnaissance aircraft	English Electric P.31, Gloster P.505

Naval Requirement/Aircraft, Naval Staff Requirements

Spec	Req.	Year	Type	Related aircraft
U.25/49	NA.03		Small Pilotless Target Aircraft
N.12/45	NA.07		Single Seat, Long Range, Naval Fighter Aircraft	Westland Wyvern TF.2
N.114T	NA.14		2-seat all-weather day/night fighter
N.9/47	NA.17	16/09/47	Naval Fighter Aircraft	Supermarine Type 508, 525 and 529 Scimitar prototypes
S.14/48	NA.21	09/07/48	Naval Version of Sikorsky S.51 Helicopter	Westland Dragonfly HR.1
19/48P	NA.27		Production of a Naval Fighter to E.1/45	Supermarine Attacker F.1
	NA.31	195?	Skeeter for RN	Saunders-Roe Skeeter
M.123	NA.32	195?	Light carrier-borne Anti-submarine warfare aircraft to Spec. M.123	Short Seamew
	NA.34	May 1952	Hooked Swift for Carrier Trials
	NA.36			de Havilland Sea Vampire T.22
M.148	NA.39	08/02/53	Carrier borne strike aircraft to Spec. M.148T	Armstrong Whitworth AW.168, Blackburn Buccaneer, Short PD.13
	NA.43		Anti-Submarine and General Purpose helicopter
	NA.47	195?	Mixed rocket-jet interception fighter for Royal Navy	Saunders-Roe SR.177 ; cancelled 1957
	NSR.6451	19??	V/STOL carrier borne fighter aircraft – Naval Hawker Siddeley Harrier	BAE Sea Harrier

General Staff Requirements For Aircraft

Spec	GSR	Year	Type	Related aircraft
	GSR.3335	196?	Helicopter – Westland Scout replacement	Westland Lynx
	GSR.3336	196?	Helicopter – Bell 47G Sioux replacement	Westland Gazelle

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