The Avro 689 Tudor 9 was based on the Avro 689 Tudor II piston-engined airliner using experience on work on the Rolls-Royce Nene jet-powered experimental variant the Tudor 8 which made its first flight on 6 September 1948.
O Avro 689 Tudor 9 estaba baseado no avión de pistóns Avro 689 Tudor II usando a experiencia do traballo coa versión experimental Tudor 8 equipado con reactores Rolls-Royce Nene e que voara por vez primeira o 6 de setembro de 1948.