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Avro 621 Trainer Avro 621 Tutor
Designed as a replacement for the Avro 504N, the original Avro Trainer of 1929 featured a welded steel-tube structure and a 240-hp Armstrong Siddeley Lynx IVC radial engine. In 1930 the prototype Avro 621 Tutor made its first flight.
Design of the Avro 621 Tutor was of a basic biplane type with twin tandem seating for the student and instructor respectively in the tubular-shaped fuselage. Windscreens were afforded each seating position as were redundant control systems. The biplane structure was connected via a series of struts between them while the engine was fitted to the extreme forward portion of the design rotating a two-blade propeller. Landing gear were of the traditional World War 1 static design and a tail wheel was fitted at rear.
Twenty-two were built for the RAF and three for the Irish Army Air Corps.
 Avro 621 (serial A9). Avro A9 had been delivered to Baldonnel Aerodrome
on 17 April 1930 and was crashed at Maynooth 26 November 1930 and written-off.
After evaluation Avro began mass production of the 621 for the RAF under the new name of Tutor. Some 200 Tutor trainers were still in operational use with British forces by the time of the Second World War. More than 390 were built, including 14 Sea Tutors with single-step Alclad floats and powered by a 160kW Lynx engine. The Sea Tutor was treated against corrosion by sea-water, and a metal propeller and hand-turning gear were also standard. The Sea Tutor was one of the few seaplanes that could not be converted into landplane form.
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