This third Dash 7 was used by the manufacturer for testing and certification flying from May 1977 to May 1978 as C-GQIW-X before delivery to Spantax as EC-DCB. Returned to DHC in May 1981, the aircraft was leased by Air BC in July 1981 as they rapidly expanded their IFR operations. It was returned to De Havilland in April 1989 as the airline was adding the BAe-146 to the fleet. Stored at Las Vegas, it was damaged in a hangar fire in March 1990. The aircraft was later parted out and scrapped.

Air BC leased this Dash 7 from July 1983 to April 1989 as their first large regional airliner. Former De Havilland Canada development aircraft (C-GQIW-X ), it was sold to Spantax S.A., as EC-DCB in May 1978, but was returned to DHC in May 1981. Ferried to Las Vegas, NV in April 1989 for storage, it was later damaged in a hangar fire. Bought by AGES Group, an aircraft parts broker, it was parted out and scrapped.

This aircraft is shown after it was damaged in a hangar fire at Las Vegas Airport on 9th October 1989. It was not repaired and was later scrapped.

Air BC ran the Victoria to Vancouver shuttle service for CP Air at this time. First operator was Spantax as EC-DCB then leased from DHC by AirBC from July 1983 to April 1989. Later became N703WW and cancelled 25 March 1995.