The "CF-100 Mark 1" prototype, "18101", emerged from the factory, painted gloss black overall with white lightning bolts running down the fuselage and engines. On 19 January 1950, the CF-100 prototype flew its maiden flight with Gloster Aircraft Company Chief Test Pilot Squadron Leader Bill Waterton (on loan from Gloster, then also part of the Hawker Siddeley group) at the controls. The Mark 1 was powered by a pair of Rolls-Royce Avon RA 3 turbojet engines, each capable of generating a maximum thrust of 28.9 kN (2,950 kgp / 6,500 lbf) thrust. During July 1950, the second prototype, "18102", performed its first flight. On 5 April 1951, the second prototype was lost in an accident that killed test pilot Bruce Warren. According to aviation author James Dow, this loss resulted in the programme being placed on indefinite hold and questions raised over Avro Canada's competency.