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Avro 621 Tutor and Variants

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

Produced Variants

Type 621
 
 
Two-seat primary training biplane with heavily staggered equal-span, single-bay wings and fabric covered steel tube construction. One 155 h.p. Armstrong Siddeley Mongoose IIIA or IIC, or 215 h.p. Armstrong Siddeley Lynx IVC powerplant.
All non-UK produced aircraft featured the Lynx powerplant.
Type 621 Trainer RAF variant to meet Specification 3/30. 155 h.p. Armstrong Siddeley Mongoose IIIA powerplant.
Type 621 Tutor Mk.I
 
Main RAF production variant to meet the requirements of Specifications 18/31 and 25/32 as indicated.
215 h.p. Armstrong Siddeley Lynx IVC powerplant.
Type 621 Tutor Mk.II One aircraft modified into a two bay biplane.
Type 623 3-seat version of Type 621 for aerial survey duties. One 240 h.p. Armstrong Siddeley Lynx IV powerplant.
Type 646 Sea Tutor Two-seat seaplane variant of Type 621 Tutor Mk.I fitted with twin floats to meet Specifications 26/32 and 26/34 as indicated.


Projected Variants

Type 662 Improved version. Armstrong Siddeley Lynx powerplant.
Type 669 Improved version. Armstrong Siddeley Cheetah powerplant.

Foreign Derivatives

Poland - PWS (Podlaska Wytwórnia Samolotów)

PWS-18
 
The wing construction was changed from metal to wooden and other detail changes. Avia-built 240 h.p. Wright Whirlwind J-5B powerplant.


Production List Page Top




Type 621 & Tutor - UK Built

Production List Top Page Top 

Type 621 Trainer
Serial Range /
Initial Registration
C/n
Batch Qty
Conv.
Canc'd
Notes
 1 aircraft built by A.V. Roe & Co. Ltd., Newton Heath in late 1929.
 G-AAKT  321  1      Mongoose Prototype; converted to Type 621 Lynx-Tutor as K1797.
 1 aircraft built by A.V. Roe & Co. Ltd., Newton Heath in late 1929.
 G-AARZ  322  1      Lynx Prototype, later under Class 'B' conditions as K-4; retained by Avro.
 3 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester, for the Irish Army Air Corps. Delivered in between March and May 1930.
 A.7 - A.9  410-412  3      A.W. Mongoose.
 11 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester, to contract 9373/30. Delivered between May and June, 1930. See Note 4.
 K1230 - K1240    11      
 1 aircraft built by A.V. Roe & Co. Ltd., Newton Heath. Delivered in July 1930.
 VH-UOL  413  1      (Mongoose). To Australian National Airways Ltd.
 10 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester, to contract 49321/30. Delivered between September and October, 1930. See Note 4.
 K1787 - K1796    10      
 1 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester, to contract 50505/30. Delivered in October, 1930.
 K1797      (1)    Conversion of Type 621 prototype G-AAKT; known as Type 621 Lynx-Tutor.
 1 aircraft built by A.V. Roe & Co. Ltd., Newton Heath in late 1930.
 G-AATU  437  1      Second Lynx Prototype; retained by Avro.
 1 aircraft built by A.V. Roe & Co. Ltd., Newton Heath in late 1930.
 CF-ANQ  463  1      (Mongoose). To Armstrong-Siddeley Motors Ltd. of Ottawa. To RCAF in August 1937 as RCAF 224.
 1 aircraft built by A.V. Roe & Co. Ltd., Newton Heath in late 1930.
 See Note 5  464  1      To Far East Aviation Co Ltd. as demonstrator for China.
 1 aircraft built by A.V. Roe & Co. Ltd., Newton Heath in October 1930.
 G-ABFL  477  1      Retained by Avro. Tested to destruction.
 2 aircraft built by A.V. Roe & Co. Ltd., Newton Heath for Air Service Training Ltd. Delivered March 1931.
 G-ABIR  497  1      Used for floatplane instruction, but not indicated as a Type 646.  Impressed as HM504, November 1941.
 G-ABIS  498  1      Impressed as HM505 November 1941.
 6 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester, for the Royal Canadian Air Force. Delivered between July and September, 1931.
 184 - 189  506, 510, 508, 509, 511, 507  6      
 5 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester, for the Kwangsi Air Force. Delivered 1931
   512-516  5      
 2 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester, for the Danish Naval Air Service (Danske Sovaernets Flyvevaesen). Delivered January, 1932.
 113 - 114  550, 551  2      Danish designation L.B.1V (Land Biplane IV)
 2 aircraft built by A.V. Roe & Co. Ltd., Newton Heath for National Aviation Day Displays Ltd. Delivered March 1931.
 G-ABZP, G-ABZR  624-625  2      
 2 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester, for the South African Air Force. Delivered in 1933(?).
 701 - 702  638, 641  2      
 1 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester, for the Danish Naval Air Service (Danske Sovaernets Flyvevaesen). Delivered  1934(?).
 115  774  1      
 1 aircraft built by A.V. Roe & Co. Ltd., Newton Heath in October 1930.
 G-ADMG  795  1      Avro Demonstrator. To Royal Hellenic Air Force as E-69.
 2 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester, for the Polish Air Force (Polskie Wojska Lotnicze), Warsaw. Delivered May, 1935.
   826-827  2      
 30 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester, for the Royal Hellenic Air Force (Elliniki Vassiliki Aeroporia). Delivered between March and October, 1936.
 E-50 - E-68  891-909  19      
 E-69  795    (1)    Ex G-ADMG
 E-70 - E-79  910-919  10      
 1 aircraft transferred to the Royal Canadian Air Force. Delivered August 1937.
 224  463    (1)    Ex Mongoose Trainer CF-ANQ, now fitted with A.W. Lynx.
 
Total Production
 83
 (3)
 
 

Type 621 Tutor (All Mk.I except as noted)

Production List Top Page Top 

Serial Range
C/n
Batch Qty
Conv.
Canc'd
Notes
 18 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester, to contract 113780/31 to meet Specification 18/31. Delivered between October and December, 1931.
 K2496 - K2513    18      
 277 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester, to contract 195190/32 to meet Specification 25/32. Delivered between March, 1933 and December, 1935.
 K3189 - K3307    119      
 K3308    1      Sole Type 621 Tutor Mk.II
 K3309 - K3371    63      
 K3381 - K3474    94      
 40 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester, to contract 350988/34 to meet Specification 24/34. Delivered between December, 1934 and March, 1935.
 K4798 - K4837    40      
 45 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester, to contract 411542/35 to meet Specification 24/34. Delivered between August, 1935 and April, 1936.
 K6087 - K6126    40      
 K8168 - K8172    5      
 
Total Production
 380
 
 
 



Type 621 Trainer - Non-UK Built

Production List Top Page Top 

Serial Range
C/n
Batch Qty
Conv.
Canc'd
Notes
Denmark
 3 aircraft ordered from the Danish Naval Shipyard (Orlogsvaerftet) for the Danish Naval Air Service (Danske Sovaernets Flyvevaesen). One delivered in June 1935, and two in
 April/May 1937.
 116 - 118    3      
Greece
 62 aircraft ordered from the Greek State Aircraft Factory (Kratiko Ergostasio Aeroplanwn), for the Royal Hellenic Air Force (Elliniki Vassiliki Aeroporia). Deliveries began in 1936.
 ????    62      See Note 1
South Africa
 49 aircraft ordered from Aircraft and Artillery Depot, Roberts Heights, Pretoria, South Africa., for the South African Air Force. Deliveries began in 1935.
 703 - 751    49      
 
Total Production
 114
 
 
 



Type 623 (See Note 3)

Production List Top Page Top 

C/n
Initial Registration
Notes
 3 aircraft built by A.V. Roe & Co. Ltd., Newton Heath, Manchester, and supplied to the Director of Surveys, Tanganyika between May and November 1930.
 461  G-ABAP  To The Governor of Tanganyika, Dar-es-Salaam as VR-TAB, April 1932.  To Kenya Auxiliary Air Unit as K24, September 1939.
 462  G-ABAR  To The Governor of Tanganyika, Dar-es-Salaam as VR-TAC, April 1932.  To Kenya Auxiliary Air Unit as K25, September 1939.
 487  G-ABHA  To The Governor of Tanganyika, Dar-es-Salaam as VR-TAE, April 1932.
Total Production   3



Type 646 Sea Tutor

Production List Top Page Top 

Serial Range /
Initial Registration
C/n
Batch Qty
Conv.
Canc'd
Notes
 1 aircraft built by A.V. Roe & Co. Ltd., Newton Heath in November 1930.
 G-ABGH  485  1      Prototype seaplane; to K2893 September 1932.
 1 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester, to contract 174961/32 to meet Specification 26/32. Delivered in September, 1932.
 K2893      (1)    Ex-G-ABGH
 9 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester, to contract 261030/33 to meet Specification 26/34. Delivered between April and September, 1934.
 K3372 - K3380    9      
 2 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester, to contract 335645/34 to meet Specification 26/34. Delivered in April, 1935.
 K3475 - K3476    2      
 3 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester, to contract 419033/35 to meet Specification 26/34. Delivered in February, 1936.
 K6923 - K6925    3      
 
Total Production
 15
 (1)
 
 



Foreign Derivatives - Poland

Production List Top Page Top 

PWS-18
Serial Range
C/n
Batch Qty
Conv.
Canc'd
Notes
 40 aircraft ordered from PWS (Podlaska Wytwórnia Samolotów, or Podlasie Aircraft Works), Biala Podlaska, Poland, for the Polish Air Force. Deliveries began in 1935.
   80.1-80.40  40      
 
Total Production
 40
 
 
 



Production Summary

Page Top 

Total Production By Type and Mark Total Production By Type
Type
Built New
Conv.
Canc'd
Total
 
Type
Built New
 Type 621 Trainer
83
 
 
83
 
 Type 621
577 
 Type 621 Tutor Mk.I
379
 
 
379
 
 Type 623
3
 Type 621 Tutor Mk.II
1
 
 
1
 
 Type 646
15
 Type 621 (Non-U.K. Built)
114
 
 
114
 
 
595 
 Type 623
3
 
 
3
     
 Type 646 Sea Tutor
15
 
 
15
     
(See Note 2)
595
0
0
465 
     

Exports of British Built Aircraft to Foreign Air Arms Polish Derivative Production
Customer
Qty
 
Type
Original Build
 Canada
7
 
 PWS-18
40
 Denmark (Navy)
3
 
 
40
 Greece
30
     
 Ireland
3
     
 Kwangsi
5
     
 Poland
2
     
 South Africa
2
     
 
52
     

Notes
  1. Little is known of Greek production. Hellenic Air Force history [3] quotes Little is known of Greek production. Hellenic Air Force history [3] quotes "Thirty british-built airplanes were delivered in 1936 and 62 more were to be domestically produced. In December of 1939 59 Avro 621 were available, while 30 more airplanes were under production at the State Airplane Factory, the production line pace being about 7 airplanes per month." Photographic evidence exists showing at least serials E106 and E140. Four presumed ex-RHAF aircraft were impressed as HK833 - HK835 and HK853 to contract (or file or req. no.?) 2AX 9464.
     
  2. Jackson [1] also gives an additional number of enginless airframes delivered: 303 military between 1932 and 1936, 7 civil between 1931 and 1938.
     
  3. Although most sources give these as Typre 621, the Avro Heritage website [6] shows that they are Type 623.
     
  4. Origin uncertain, possibly G-AAKT. However, G-AAKT was a Mongoose Trainer [1], and K1797 is recorded as a Lynx Trainer [7].
Production References
  1. Avro Aircraft Since 1908, A.J. Jackson (Putnam, 1990)
  2. 85 Years Of South African Air Force, Winston Brent (Freeworld Publications, 2007)
  3. https://www.haf.gr/en/history/historical-aircraft/avro-621-tutor/
  4. Irish Air Corps Serials at http://www.iol.ie/~asire/aircorps.html
  5. Canadian Military Aircraft Serial Numbers at: http://www.ody.ca/~bwalker/index.htm
  6. Avrolist2 (originally from www.avroheritage.com) at: https://www.secretprojects.co.uk/avrolist2.pdf
  7. The K File, The Royal Air Force of the 1930s, J.J. Halley (Air-Britain Publications, 1995)
  8. Polish Aircraft 1893-1939, Jerzy B Cynk (Putnam, 1971)

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Page Revision History Page Top

Revised at Version 1.4.0
  • Added user details.
  • Corrected G-ABGH to Sea Tutor.

V1.4.0 Created by Roger Moss. Last updated July 2019