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Avro 621 Tutor and Variants

Produced Variants
 Type 621Two-seat primary training aircraft. 155 h.p. Armstrong Siddeley Mongoose IIIA or IIC, or 215 h.p. Armstrong Siddeley Lynx IVC
 powerplant.
 Type 621 TrainerRAF variant to meet Specification 3/30. 155 h.p. armstrong Siddeley Mongoose IIIA powerplant.
 Type 621 Tutor Mk.IMain 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.IIOne aircraft modified into a two bay biplane.
 Type 621 (Non-U.K. Built)Type 621s built outside the UK were to the same standard as the Type 621 Tutor Mk.I.
 Type 6233-seat version of Type 621 for aerial survey duties. 240 h.p. Armstrong Siddeley Lynx IV powerplant
 Type 646 Sea TutorTwo-seat seaplane fitted with twin floats to meet Specifications 26/32 and 26/34 as indicated.

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

Foreign Produced Variants

Poland - PWS (Podlaska Wytwórnia Samolotów)

PWS-18Type 621 built under licence, with wing construction was changed from metal to wooden and other detail changes.
 Avia-built 240 h.p. Wright Whirlwind J-5B powerplant.



Type 621 and Tutor

Production List TopPage Top 

Type 621 and Type 621 Trainer Delivered As Military

Serial Range

C/n

Batch Qty

Conv.

Canc'd

Notes

 3 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester, for the Irish Army Air Corps. Delivered in March, 1930.
 A.7 - A.9 410-412 3   
 11 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester, to contract 9373/30. Delivered between May and June, 1930.
 K1230 - K1240  11   
 10 aircraft ordered from A.V. Roe & Co. Ltd., Newton Heath, Manchester, to contract 49321/30. Delivered between September and October, 1930.
 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)  See note 4
 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 Kwangai 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   
 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 January, 1932.
 115 774 1   
 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 CF-ANQ
 

Total Production

 71

 (3)

 

Type 621 Tutor Delivered As Military (All Mk.I Except As Noted)

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

 

Non-U.K. Built Type 621 Delivered As Military

Serial Range

C/n

Batch Qty

Conv.

Canc'd

Notes

 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   
 3 aircraft ordered from the Danish Naval Shipyard (Orlogsvaerftet) for the Danish Naval Air Service (Danske Sovaernets Flyvevaesen). Delivered between June, 1935, and April, 1937.
 116 - 118  3   
 60+ aircraft ordered from the Greek State Aircraft Factory (Kratiko Ergostasio Aeroplanwn), for the Royal Hellenic Air Force (Elliniki Vassiliki Aeroporia). Deliveries began in 1936.
 ????  60   See Note 1

Total Production

 112

  

Type 621 - Aircraft Delivered As Civil

C/n

Initial Registration

Notes

 13 aircraft built by A.V. Roe & Co. Ltd., Newton Heath, Manchester, between 1929 and 1932 except as noted.
 321 G-AAKT See note 4
 322 G-AARZ 
 413 VH-UOL 
 437 G-AATU 
 463 CF-ANQ To R.C.A.F. as 224
 464 VF-HAF 
 477 G-ABFL 
 485 G-ABGH To RAF as  Sea Tutor K2893
 497 G-ABIR Impressed as HM504
 498 G-ABIS Impressed as HM505
 624 G-ABZP 
 625 G-ABZR 
 795 G-ADMG Built 1935. To Royal Hellenic Air Force as E-69

Total Production   13


Civil Type 621 Converted From Military 

C/n

Initial Registration

Notes

  G-ACOV Ex K1791
  G-ADYW Ex K1231
  G-AFZW Ex K3237, impressed as AV980 under file B.50801/39.
  G-AHSA Ex K3215
  G-AIYM Ex K3363
  G-AKFJ Ex K6105

Total Conversions   (6)


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 in February 1932.
 461 G-ABAP Later VR-TAB (see note 3); to Kenya Auxiliary Air Unit as K24
 462 G-ABAR Later VR-TAC (see note 3); to Kenya Auxiliary Air Unit as K25
 487 G-ABHA Later VR-TAE (see note 3)

Total Production   3




Type 646 Sea Tutor

Production List Top Page Top 

Serial Range

C/n

Batch Qty

Conv.

Canc'd

Notes

 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

 14

 (1)

 

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
All Aircraft By Type Foreign Derivatives

Type

Original Build

Type

Original Build

 Type 621

84

 PWS-18

40

 Type 621 Tutor Mk.I

379

40

 Type 621 Tutor Mk.II

1

 Type 621 (Non-U.K. Built)

112

 Type 623

3

 Type 646 Sea Tutor

14

(See Note 2)

593

   

Exports of British Built Aircraft to Foreign Air Arms

Customer

Qty

 Canada

7

 Denmark (Navy)

3

 Greece

30

 Ireland

3

 Kwangai

5

 Poland

2

 South Africa

2

Notes
  1. Little is known of Greek production. Hellenic Air Force history [3] quotes "In December of 1939, 59 Avro 621 were available. In the same month, 30 more airplanes were undere(sic) production at the National Airplane Factory. The production line pace was 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. Aircraft of the Hellenic Air Force 1929-2001, D. Vogiatzis (published in Greek by the HAF, 2001).
  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. http://www.avroheritage.com/index.html Sadly, this site is no longer active
  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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V1.3.0 Created by Roger Moss. Last updated February 2017