Loss of separation involving a de Havilland Canada DHC-8-102, VH-TNX and Beech Aircraft Corp C90, VH-FDW, 4km NNE Brisbane, Aerodrome, QLD on 1 September 1997

The aerodrome controller had cleared one aircraft for takeoff. The intention was to have the following aircraft cleared for takeoff when the first aircraft had gained adequate distance and was turning away from the initial departure track. The second aircraft was allowed to depart about one minute after the first. This was too soon as the controller was unable to maintain visual separation due to both aircraft being on the same track, away from the controller's view. There was also insufficient distance between the two aircraft to provide the required radar separation standard. Separation was positively established after the first aircraft turned to a new heading.