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Avro 504N and O

For description of Types 504N and O see Production Summary

For a description of the format and data included in Production Tables, see here.



Production List Page Top




Type 504N - Development and Intermediate Aircraft

Production List Top Page Top 

Type 504K Aircraft Used in Type 504N Development. (See Note 1)
Serial /  Registration
Notes
 K-147  Fitted with 170 h.p. A.B.C. Wasp I by A.V. Roe, Hamble, in early 1919.
 G-EADL  Fitted with 100 h.p. Lucifer by Cosmos Engineering Co. Ltd, Filton, in 1919.
 G-EAJB  Fitted with 100 h.p. Lucifer by Cosmos Engineering Co. Ltd, Filton, in 1919. On loan from Avro and featured a semi-oleo skid undercarriage and featured tapered ailerons.
 D9068  Fitted with 170 h.p. A.B.C. Wasp I by RAE, Farnborough, in early 1920.
 G-EADA  Fitted with 100 h.p. Cosmos Lucifer by A.V. Roe, Hamble, in early 1922. Fitted with the N-Type undercarriage in 1923.
 E9265  Fitted with 150 h.p. Armstrong Siddeley Lynx by A.V. Roe, Hamble, in 1922.
 E9266  Fitted with 150 h.p. Armstrong Siddeley Lynx by A.V. Roe, Hamble, in 1922.
 G-EBFB  Fitted with 100 h.p. Lucifer by Cosmos Engineering Co. Ltd, Filton, in 1922.
Total Conversions   (8)

Intermediate Type 504Ns - Rebuilds From Spare Type 504K Airframes. See Note 2.
C/n
Initial
Registration
Notes
 4 aircraft rebuilt by A.V. Roe & Co. Ltd., Newton Heath, Manchester, for the Armstrong Whitworth Reserve Flying School, Whitley, in 1923.
 R3/LY/10331  G-EBHC  
 R3/LY/10348  G-EBHD  Later to R.O. Roch, Hanworth, and was the tug used for the first cross-Channel glider flight.
 R3/LY/10365  G-EBHE  Reconverted to Type 504K in 1932.
 R3/LY/10382  G-EBHT  
Total Production   (4)



Type 504N - UK Built Delivered As Military

Production List Top Page Top 

New Build Except As Noted
Serial Range
C/n
Batch Qty
Conv.
Canc'd
Notes
 Prototypes ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester and Hamble, Hants, to contract 452529/24. Built using 504K airframes off the Manchester production line. Delivered late 1923.
 J733, J750      (2)    J733 fitted with 115 h.p. Bristol Lucifer IV powereplant.
 1 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester and Hamble, Hants, to contract 492529/24 to meet Specification 32/24. Delivered 1924.
 J7301    1      Fitted with 150 h.p. Armstrong SiddeleyMongoose III powereplant.
 250 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester and Hamble, Hants, to contract 741256/26 to meet Specification 3/27.
 J8496 - J8595    100      
 J8676 - J8775    100      
 J8975 - J9024    50      
 60 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester and Hamble, Hants, to contract 837618/28 to meet Specification 3/27.
 J9253 - J9292    40      
 J9415 - J9434    20      
 25 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester and Hamble, Hants, to contract 890992/28 to meet Specification 3/27. Delivered between January and November, 1929.
 J9683 - J9707    25      
 25 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester and Hamble, Hants, to contract 928312/29 to meet Specification 3/27. Delivered in November, 1929.
 K1038 - K1062    25      
 38 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester and Hamble, Hants, to contract 5789/30 to meet Specification 6/30. Delivered between July and October, 1930.
 K1242 - K1253    12      
 K1798 - K1823    26      
 35 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester and Hamble, Hants, to contract 90666/31 to meet Specification 6/30. Delivered between June and July, 1931.
 K1956 - K1990    35      
 78 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester and Hamble, Hants, to contract 122030/31 to meet Specification 6/30. Delivered between October 1931 and March, 1932.
 K2346 - K2423    78      
 
Total Production
 512
(2)
 
 

RAF Type 504N Converted From Type 504K

Production List Top Page Top 

Serial
 D4430, D4432, D4452, D6382, D6383, D6388, D9021, D9290
 
 E430, E1803, E2931, E3026, E3150, E3284, E3318, E3323, E3327, E3333, E3401, E3436, E3460, E3462, E3531, E3718, E3732, E3735, E3759, E9265, E9266
 E9268, E9352, E9357, E9359, E9408, E9411, E9417, E9452, E9453, E9457, E9506
 
 F2254, F2264, F2269, F2286, F2308, F2575, F2580, F2588, F2589, F2592, F2613, F2623, F8713, F8765, F8772, F8798, F8804, F8808, F8812, F8813, F8832
 F8833, F8834, F8873, F8944, F9704, F9705, F9715, F9734, F9773, F9776, F9825, F9844
 
 H236, H255, H1982, H2201, H2262, H2286, H2402, H2432, H2434, H2435, H2460, H2478, H2483, H2524, H2525, H2526, H2528, H2533, H2535, H2536
 H2539, H2543, H2546, H2551, H2577, H2580, H2583, H2589, H2611, H2612, H2618, H2623, H2953, H2962, H2968, H2972, H2974, H2975, H2981, H2982
 H2995, H3015, H3017, H3050, H3105, H5180, H5185, H5187, H5196, H5199, H5255, H7521, H7524, H7527, H7534, H9514, H9569, H9705, H9718, H9815
 H9816, H9821, H9824, H9825, H9826, H9852, H9862, H9866, H9867, H9869, H9870, H9871, H9872
 
 J869, J875, J8372
Total Conversions   (149)



Type 504N/O UK Built For Export As Military

Production List Top Page Top 

Rebuilds From Spare  Type 504K   Airframes (In alphabetical order by country). See Note 11
Serial Range
C/n
Type
Qty
Notes
Argentina
 4 Type 504K Lucifer aircraft supplied by the Aircraft Disposal Co Ltd to the Argentine Military Aviation School (Escuela Militar de Aviacion (EMA)) in 1926.
     504N  (4)  See Note 8.
Belgium
 10 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester and Hamble, Hants, for the Belgian Air Force (L'Aeronautique Militaire Belge). Delivered December, 1929.
 X1 - X10  373-382  504N  (10)  
   7 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester and Hamble, Hants, for the Belgian Air Force (L'Aeronautique Militaire Belge). Delivered between January and
   March, 1931.
 X11 - X15  480-484  504N  (7)  
 X16 - X17  492-493      
Brazil
 6 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester and Hamble, Hants, for the Brazilian Naval Air Force (Aviacao Naval). Delivered May, 1930.
 441 - 446  439-442 per Jackson [1], plus
 2 others
 504N/O  (6)  Mixed 504Ns and 504Os. Remaining machines later given new serials I2A-7 to I2A-9.
Canada
 2 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, for the Royal Canadian Air Force. Delivered September1928
 C-CYFY, C-CYFZ  R3/LY/10598, R3/LY/10617  504N  (2)  Later re-registered 8 & 9.
Chile
 7 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester and Hamble, Hants, for the Chilean Naval Air Service (Servicio de Aviación Naval de Chile). Delivered 1927.
 15 - 21    504N/O  (7)  See note 2.
   6 aircraft ordered from A.V. Roe & Co. Ltd., Hamble, Hants, for the Chilean Naval Air Service (Servicio de Aviación Naval de Chile). Delivered August, 1929.
 82 - 87  355-360  504N/O  (6)  See note 2.
Denmark
 1 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester and Hamble, Hants, for the Danish Marine Air Service (Danske Marinens Flyvevaesen). Delivered Sep 1925.
 107    504N  (1)  Danish designation L.B.1 (Land Biplane 1)
Greece
 6 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester and Hamble, Hants, for the Royal Hellenic Naval Air Service (Anexartita Ellinika Naftika Smini). Delivered 1925.
 E5, E13, E16, E33, E37, E40    504N/O  (6)  Mixed 504Ns and 504Os to Works Order 7787
Japan
 1 aircraft ordered from A.V. Roe & Co. Ltd., Hamble, Hants, for Japan to Works Order 8430. Delivered in January 1927.
     504O  (1)  
Thailand (Siam)
 20 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester and Hamble, Hants, for the Royal Siamese Aeronautical Service. Delivered in March, 1930.
   390-409  504N  (20)  Designated Type BF.4 in the RSAS.
Sweden
 1 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester and Hamble, Hants, for the Royal Swedish Air Force (Kungliga Svenska Flygvapnet). Delivered in April, 1926.
 64    504N  (1)  Swedish designation Sk 3A
Total Production (504N)
(45)
 
Total Production (504O)
(1)
 
Total Production (504 N/O)
(25)
 



Type 504N - UK Built Delivered As Civil

Production List Top Page Top 

UK Civil Registered Type 504N - New Build
C/n
Initial
Registration
Notes
 5104  G-EBKQ  Built by A.V. Roe & Co. Ltd., Hamble, Hants, in 1925 and used experimentally. Modified to Type 582 in March 1927, reverted to 504N and became Bristol Titan test bed. 
     Converted to 504O with Class 'B' marks K-8.
Total Built    1

UK Civil Registered Type 504N - Aircraft Converted from Military.

Production List Top Page Top 

C/n
Initial
Registration
Original Military
Serial
Notes
   G-ABVC  F8834  Originally a 504N converted from 504K. To Harold Chater, Lympne, fitted with 115 h.p. Bristol Lucifer IV powereplant. See note 7.
   G-ABVH  J8372  Originally a 504N converted from 504K. To Air Travel Ltd, Wisbech, Cambs. (registered to F.J.V. Holmes). 115 h.p. Armstrong Siddeley
       Mongoose IIIA pwerplant.
   G-ABVY  H2524  Originally a 504N converted from 504K. To Air Travel Ltd, Wisbech, Cambs. (registered to F.J.V. Holmes). 115 h.p. Armstrong Siddeley
       Mongoose IIIA pwerplant.
   G-ACLV  J8573  To Air Travel Ltd, Wisbech, Cambs. (registered to Frederick James Vernon Holmes).
 R3/LY/93598  G-ACNV  K1808  To (unknown, February 1934); later to E.B. Fieldon, then Air Pageants Ltd by April 934.
   G-ACOD  F8713  Originally a 504N converted from 504K. To Air Travel Ltd, Wisbech, Cambs. (registered to Frederick James Vernon Holmes).
   G-ACOK  F2588  Originally a 504N converted from 504K. To National Aviation Displays Ltd. 115 h.p. Armstrong Siddeley Mongoose IIIA pwerplant.
   G-ACOM  E430  Originally a 504N converted from 504K. To Air Travel Ltd, Wisbech, Cambs. (registered to Frederick James Vernon Holmes).
   G-ACPV  K1250  To Leslie George Anderson, Hanworth. Impressed as BV209 under file B.50801/39.
   G-ACRE  E9408  Originally a 504N converted from 504K. To (unknown, May 1934); later to H.B.G. Michelmore, Hedon, then Air Publicity Ltd by April 1935.
   G-ACRS  K1802  To National Aviation Displays Ltd.
   G-ACZC  K1802  To C.S.C. Brudenell-Bruce (Earl of Cardigan). Impressed as AX854 under file B.50801/39; see note 5.
   G-ADBD  K1245  To (unknown, January 1935); later to National Aviation Displays Ltd by June 1935. 115 h.p. Armstrong Siddeley Mongoose IIIA pwerplant.
   G-ADBM  K1055  To (unknown, January 1935); later to H.C. Wardle, Shoreham by March 1935. Impressed as AX871 under file B.50801/39
   G-ADBO  K2354  To Leslie George Anderson, Hanworth.
   G-ADBP  K2353  To Leslie George Anderson, Hanworth. Impressed as AX874 under file B.50801/39.
   G-ADBR  K1819  To Leslie George Anderson, Hanworth.
   G-ADBS  K1251  To Leslie George Anderson, Hanworth. 115 h.p. Armstrong Siddeley Mongoose IIIA pwerplant.
   G-ADDA  K1810  To Air Services Ltd.
   G-ADEI  E3460  Originally an RAF 504N converted from 504K. To Herbert Basil Goldwyn Michelmore, Hedon.
   G-ADET  J8533  To Air Publicity Ltd, Heston. Impressed as AX875 under file B.50801/39.
 R3/LE/61400  G-ADEV  H5199  Originally an RAF 504N converted from 504K. To Air Publicity Ltd, Heston.  Impressed as BK892 under contract SB.7560/E1. See note 6.
   G-ADFW  K1061  To Lincolnshire Flying Services, Louth. 115 h.p. Armstrong Siddeley Mongoose IIIA pwerplant.
   G-AECR  K2396  To Lionel John Anderson, Hanworth.
   G-AECS  J8548  To Lionel John Anderson, Hanworth.
   G-AEDD  K1823  To Plane Advertising Ltd,Stapleford.
   G-AEGW  J9702  To Air Travel Ltd, Gatwick.
   G-AEIJ  J8507  To Air Travel Ltd, Gatwick.
   G-AEMP  J9017  To Air Travel Ltd, Gatwick. Impressed as BV208 under file B.50801/39.
   G-AFRM  K1964  To Martin Hearn Ltd, Hooton Park.
Total Conversions   (29)

UK Civil Registered Type 504N - Conversions from Civil Type 504K or From Spare Type 504K Airframes

Production List Top Page Top 

C/n
Initial
Registration
Notes
 R3/CN/126  G-ABVY  Ex 504K converted by A.V. Roe & Co. Ltd., Newton Heath, in 1928. Later to Leslie G.Anderson, Hanworth.
   G-ACCX  Ex 504K converted by F.J.V. Holmes (Air Travel Ltd, Wisbech, Cambs) in 1933. 115 h.p. Armstrong Siddeley Mongoose IIIA pwerplant.
 14  G-AEAA  By C.B. Field, Kingswood, in 1936, most likely built from spares, for Francis C.H. Allen, Kingswood, Surrey. 115 h.p. Bristol Lucifer IV powerplant.
Total Conversions   (3)



Type 504N - Non-UK Built Delivered As Military

Production List Top Page Top 

New Build (In alphabetical order by country)
Serial Range
C/n
Batch Qty
Conv.
Canc'd
Notes
Belgium
 31 aircraft ordered from Societe Anonomye Belge des Constructions Aeronautique for the Belgian Air Force (L'Aeronautique Militaire Belge). Delivered between 1934 and 1939.
 X18 - X48  1-31  31      
Canada
 1 aircraft ordered from Canadian Vickers Ltd., Maisonneuve, Montreal, Canada, for the Royal Canadian Air Force. Delivered in July 1925.
 12  CV29  1      Initially registered G-CYGK. See note 3.
   6 aircraft ordered from Canadian Vickers Ltd., Maisonneuve, Montreal, Canada, for the Royal Canadian Air Force. Cancelled.
         6 Two seaplanes (A.W.S) and 4 landplanes (A.W.L.)
   12 aircraft ordered from Canadian Vickers Ltd., Maisonneuve, Montreal, Canada, for the Royal Canadian Air Force. Delivered in 1928.
 32 - 43  CV59-CV70  12      See note 4.
Denmark
 3 aircraft ordered from the Danish Naval Shipyard (Orlogsværftet Flyvemaskiner Værksted), Copenhagen, Denmark, for the Danish Marine Air Service (Danske Marinens Flyvevaesen).
 Delivered in 1926.
 108 - 110  O.V.43, O.V.49, O.V.50  3      
Greece
 24 aircraft ordered from Phaliron Aircraft Factory (Ergostasio Aeroplanwn Falhrou) for the Royal Hellenic Air Force (Elliniki Vassiliki Aeroporia). Delivered 1934.
     24      Quantity uncertain
Thailand (Siam)
 An unknown quantity of aircraft ordered from The Royal Siamese Aeronautical Service Workshops, Don Muang, Bankok, Siam, for the Royal Siamese Aeronautical Service.
     50      Possibly more than 50 produced. Designated Type BF.4 in the RSAS. One to Siamese Navy.
  Total Production 90   6  

Aircraft Converted From Type 504K
Serial
Notes
Canada
 20 converted for the RCAF between (mid?) 1926 and (mid?) 1928.
 1  Ex C-CYAR
 2  Ex C-CYAQ
 3  Ex C-CYCX
 4  Ex C-CYEI
 5  Ex C-CYFG. See Note 9.
 6  Ex C-CYFH
 7  Ex C-CYFJ
 13  Ex C-CYDA
 14  Ex C-CYAX
 15  Ex C-CYFF
 44  Ex C-CYAP
 45  Ex C-CYAT
 46  Ex C-CYAU
 47  Ex C-CYFL
 49  Ex C-CYHC
 50  Ex C-CYAV
 51  Ex C-CYCD
 52  Ex C-CYBM
 53  Ex C-CYBL
 54  Ex C-CYEH
Denmark
 2 aircraft converted for the Danish Marine Air Service (Danske Marinens Flyvevæsen). Delivered as noted.
 111  Ex 106, delivered in 1927.
 112  Ex 104, delivered in 1929. To civil register 1936 as OY-DEL.
South Africa
 3 aircraft converted for the SAAF in 1927.
 431  
 ??  
 ??  
Total Conversions   (25)

Aircraft Converted From Type 552A
C/n
Serial
Notes
Canada
 3 aircraft scheduled for conversion to Type 504NS(4) standard for RCAF. Only one completed. All aircraft carried civil style registrations.
 C.V.25  G-CYGG  Converted to 504NS in 1927, but retained tapered ailerons.  
 C.V.27  G-CYGI  Scheduled to be converted to 504NS, written off before conversion performed.
 C.V.28  G-CYGJ  Scheduled to be converted to 504NS, written off before conversion performed.
Total Conversions   (1)
Total Cancelled Conversions    (2)



Type 504N - Non-UK Built Delivered As Civil

Production List Top Page Top 

Aircraft Converted from Military (In alphabetical order by country)
Initial
Registration
Original Military Serial
Notes
 Denmark
Total:     (1) 
 OY-DEL  112  To Nordisk Lufttrafik. Impressed by German occupation troops 1943.
Total Production   (1)



Type 504O - UK Built Delivered As Civil

Production List Top Page Top 

Converted from Civil 504N
C/n
Initial
Registration
Notes
 5104  none  Converted by A.V. Roe from 504N G-EBKQ. Carried Class 'B' marks K-8.
Total Conversions   (1)




Notes
  1. This was a series of aircraft used in the integration of various radial engines into the Type 504 airframe in place of the rotary, along with the development of an entirely new undercarriage that came to symbolize the Type 504N. Non of these can be considered a fully developed Type N.
     
  2. Jackson [1] defines these four aircraft as an advanced interim type with oleo sprung skid-type under carriage, but photograhic evidence [13] shows at least G-EBHC, which lasted only a month before crashing, was a fully developed 504N.
     
  3. Fitted with a 200 h.p. Wright J-4 powerplant. The one aircraft built was initially a single float seaplane, later converted to a landplane with Wright J-5. RCAF designations were Avro Wright Seaplane (A.W.S.) & Avro Wright Landplane (A.W.L.). A further six were to have been ordered in 1925, two seaplanes and one land plane, but the order was never placed.
     
  4. Fitted with 180 h.p. Armstrong Siddeley Lynx IVC powerplant. First three were built as seaplanes, using the same single float design as the Type 552A, were delivered in January 1928, this being followed by nine landplanes delivered in February 1928. The floatplane version was designated Avro 504NS in the RCAF.
     
  5. G-ACZC, registered October 1934, was possibly a rebuild of G-ACRS, which crashed 6/34. both are shown with the same military serial.
     
  6. G-ADEV impressed as BK892 under file contract SB.7560/E1. To Instructional Airframe 3118M then the Shuttleworth Collection as G-ACNB in October 1981 and reconverted to Type 504K. Registration restored to G-ADEV in April 1984 but carries military serial E3404.
     
  7. G-ABVC given in G-INFO as ex F8841, but this was 504K supplied to Argentina. Jackson [1] and LAAS [9] indicates ex F8834, which would make it a 504K converted to a 504N. Vic Smiths Accident report [10] also shows as 504N.
     
  8. Known locally as Avro 504K Lucifer, these were very similar to the developmental airframe G-EBFB.
     
  9. Note that the Avro 504K displayed in the Canadian Aviation and Space Museum as “G-CYFG” is not in fact that aircraft, but its provenance is worth recording. The following from the CASM website [20]:
    "Manufactured by Avro in England 1918 (Mfr. No. A958), RAF registration H2453; Frank F. Valcourt, Pawtucket, Rhode Island, U.S. civil registration #5918, fitted with LeRhone engine 1928;
    Rooseveldt Field Museum, early 1930’s;
    J.H.C. Palen, Rhinebeck, N.Y., U.S. civil registration N8736R 1951 (used for flying displays U.S. and Canada);
    Purchased by RCAF, delivered Trenton, 19 May, 1966;
    Rebuilt 6 RD Trenton (Crew Chief MWO H. Tate) 1966-1967, TOS 1 June 1966;
    Assembled Rockcliffe, Clerget engine from National Research Council of Canada (NRCC) installed 12 Dec., 1967;
    Now on display at CASM, equipped with Turnbull Variable-pitch Propeller.
    Note: 504K, RAF registration H9555, originally assigned Canadian registration “G-CYFG,” TOS May 1924, converted to 504N 24 July 1927, SOS 30 May 1930."
    How H2453 came to be in the US originally is unclear.
     
  10. Alberto Fernandez Donoso and Ray Sturtivant [6]: "Avro supplied six 504-Os (C/n 355 to 360) to the Chilean Navy, these being modified versions of the 504N, given the Chilean serial numbers 82 to 87 inclusive and probably assembled in Chile." The same reference has a photograph of an Avro 504O '19' of the Chilean Navy converted to a landplane.
    The article then summarises as follows:
    1929 6 Avro 504-O 82 to 87 (c/n's 355 to 360). seaplanes for Navy, deld 8.29. One later as landplane "19".

    Dan Hagedorn [7]: "Regarding the alleged Chilean Navy Avro 504Os delivered in August 1929, I must confess to being puzzled by the "high" serials quoted (e.g. 82 to 87). Try as I may, I cannot come up with any reason why the Navy should have had serials such as these at that particular date. The photo accompanying this statement, on page 7, of Chilean Navy 504O serial "19" further confuses me! I must agree, however, that 19 seems a much more reasonable serial number for a Navy aircraft at that date."

    George A. Jenks [7]: "There appears to be confusion about the Avro 504Os: Avro supplied seven a/c in early 1927, serialled 15 to 21 inclusive. These were all tested with wheels at Woodford (whence the photo of No. 19) before going to Hamble for the fitment of floats prior to delivery. These machines probably bore constructors numbers in the range R3/AV/- for which no complete listing seems to have survived. They were probably supplied with both sets of undercarriages, as Jane's 1927 quoted the Chilean Navy as using "Avro lynx land or sea machines". A further batch of six aircraft were supplied in 1929 bearing the c/ns 355 to 360 and serialled 82 to 87 respectively. However, the first serial number conflicts with the last 504K..."

    Dan Hagedorn [8]: "Four 504Ns, frequently cited as going to the military circa 1925 (E444, H2512, H2562 and F8841), seem more likely to have been sold to civilian users, as no evidence has emerged to support EMA or Aviacion Militar use.

    Finally, Insignia magazine [11] adds further twists:
    "Five Avro 504Os were later constructed at the El Bosque factory from spare parts (these machines wore serials in the range 20 to 24)." An accompanying photograph positively identifies serial 82 as a Type 504K.
     
  11. Export Type 504Ns and 504Os were either supplied in mixed batches or as 504Ns with optional floats, hence for this site this author will use the term Type 504N/O.

Production References
  1. Avro Aircraft Since 1908, A.J. Jackson (Putnam, 1965 & 1990)
  2. Air Britain RAF Aircraft Serials, Various Volumes (Air-Britain Publications)
  3. Canadian Aircraft since 1909, K.M. Molson & H.A. Taylor (Putnam, 1982)
  4. Canadian Military Aircraft Serial Numbers at http://www.rwrwalker.ca/
  5. British Military Aircraft Serial, 1878 - 1987, Bruce Robertson (Midland Counties Publishing, 1987)
  6. Air Britain Digest, 1989/1 (Air-Britain Publications)
  7. Air Britain Digest, 1989/3 (Air-Britain Publications)
  8. Air Britain Digest, 1990/3 (Air-Britain Publications)
  9. British Isles Civil Aircraft Registers 1919-2011 (LAAS International, 2011)
  10. http://www.orpheusweb.co.uk/vicsmith/OldAccs/Mar30.html
  11. Insignia No.12 (Blue Rider Publishing)
  12. Los AVRO 504 en Argentina y el método Gosport at https://www.histarmar.com.ar/AVIACION/EloyMartin/EO20c/E020c.pdf
  13. http://www.edcoatescollection.com/ac5/ROW%20Europe/G-EBHC.html
  14. Avro 504 in Swedish service at http://www.avrosys.nu/aircraft/MFV/064-Avro-504K/064-Avro504K.htm
  15. http://www.naval.com.br/anb/ANB-aeronaves/Avro_504_NO/Avro_504_NO.htm
  16. http://www.airhistory.org.uk/gy/index.html
  17. The British Roundel Mar/Apr 1998
  18. The British Roundel Jan/Feb 1999
  19. The British Roundel Jul/Aug 1999
  20. https://documents.techno-science.ca/documents/CASM-Aircrafthistories-Avro504K.pdf
  21. Avro 504 in Sweden at http://www.svfplhist.com/

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V1.4.4 Created by Roger Moss. Last updated August 2020