In turn this formed the basis for the more powerful Avro 643 Cadet Mk II, entering production in 1935, This was built in the largest numbers, including 34 built for the Royal Australian Air Force.
In turn this formed the basis for the more powerful Avro 643 Mk II Cadet; it was also strengthened and had improved parachute egress. This model entered service in 1935 and was built in the largest numbers, including 34 fitted with a tail wheel for the Royal Australian Air Force.