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

The aerodrome controller had cleared one aircraft for take-off. The intention was to have the following aircraft cleared for take-off 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.