The Avro Canada CF-103 was conceived in the early 1950s as an indigenous Canadian effort to modernize the existing CF-100 Canuck all-weather interceptor. Designed as a transonic aircraft, the CF-103 sought to improve performance through the implementation of swept wings and refined aerodynamics, moving away from the straight-wing configuration of its predecessor. By December 1950, Avro Canada's design office had established a defined swept-wing configuration for the project, as evidenced by original concept drawings from that period.
Development of the CF-103 progressed to the construction of a wooden mock-up, but the aircraft never reached the prototype or flight-test stage. Internal planning assumptions once targeted July 1952 as a potential first-flight date, viewing the CF-103 as an interim solution before the development of a more advanced project known as the C-104, which eventually evolved into the CF-105 Arrow. However, as the requirements for Cold War air defense shifted rapidly toward true supersonic capabilities, the CF-103 was deemed insufficient. Consequently, the program was abandoned in favor of the more ambitious Arrow project, and no airframes were ever produced.
Technically, the CF-103 was intended to be a twin-engine jet. While specific engine models and thrust ratings were not formally documented in the project's surviving records, it was expected to utilize axial-flow turbojets from Avro's in-house division, Orenda Engines, following the precedent set by the CF-100. The aircraft was intended for service with the Royal Canadian Air Force (RCAF) as a domestic air-defense interceptor, but it never entered operational service.
Avro Canada, the design authority, was established in 1945 as a subsidiary of the British Hawker Siddeley group. The company's aircraft manufacturing operations were effectively shut down between 1959 and 1962 following the cancellation of the CF-105 Arrow on February 20, 1959. Today, no physical CF-103 aircraft or mock-ups are known to exist in museum collections; the project's legacy survives primarily through archival concept drawings and its role as a developmental stepping stone for Canadian aerospace engineers exploring transonic flight.