List of Air Ministry specifications
1920–1929
Data from: The British Aircraft Specifications File

List of Air Ministry specifications

Section Title: 1920–1929
Table Section Text: Data from: The British Aircraft Specifications File

Spec	OR	Type	Designs

1/20	None	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 superseded by 32/22 (q.v.)	Blackburn Dart (modified), Handley Page H.P.19 Hanley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 - 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 (q.v.)	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 (q.v.)	Blackburn Dart II, Bristol Brandon

37/22	Three-seat deck landing reconnaissance aircraft – Blackburn Blackburn / Avro Bison replacement	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	None	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 (production)

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 (production)

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 (Fleet Air Arm) /two-seat GP (Royal Air Force) 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 (service aircraft)	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 (civil aircraft)	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	Supermarine Southampton

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	None	Day and night 'zone' fighter – no design accepted and Spec. superseded by F.20/27 (q.v.)	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 (Heyford) 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 (q.v.)	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 (q.v.)	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 1,200 mi (1,900 km) 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 (for production)	Westland Wapiti

2/29	Two-seat carrier-borne torpedo-bomber (for production)	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 (for production)	Hawker Tomtit

6/29	General purpose landplane	Blackburn C.A.15C, Boulton & Paul P.42, Westland Limousine V

7/29	Troop carrying aeroplane (for production)	Vickers Victoria V

8/29	Single-seat fighter (for production)	Armstrong Whitworth Siskin IIIA

9/29	Day bomber (for production)	Hawker Hart

10/29	Medium day-bomber (for production)	Boulton Paul Sidestrand III

11/29	Day and night fighter (for production)	Bristol Bulldog IIA

12/29	Spotter reconnaissance aeroplane for the Fleet Air Arm (for production)	Fairey IIIF

13/29	Heavy night-bomber (for production)	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 (for development and production)	Hawker Horsley

18/29	General reconnaissance flying boat – military version of Short S.8 Calcutta	Short Rangoon

Sentence(s)

The Air Ministry issued specification 9/24 for twin engine medium bomber.

final_sentence: The Air Ministry issued specification 9/24 for twin engine medium bomber.