Section 21 (2) of the Transport Safety Investigation Act 2003 (TSI Act) empowers the Australian Transport Safety Bureau (ATSB) to discontinue an investigation into a transport safety matter at any time. Section 21 (3) of the TSI Act requires the ATSB to publish a statement setting out the reasons for discontinuing an investigation.

On 5 July 2013, the ATSB commenced an investigation into an airspace related event involving a Cessna 208B, registered VH-WZJ, and an unknown aircraft, later identified as VH-BSL, a Pilatus Britten-Norman BN2A-20 aircraft, at Horn Island, Queensland on 31 May 2013.

Examination of the voice recordings collected during the investigation indicated that the pilots of both aircraft had made broadcasts on the common traffic advisory frequency (CTAF). Furthermore, the pilot of VH-BSL indicated that he was holding short on runway 08, to allow VH-WZJ to land on the cross runway (14).

Accordingly, the ATSB decided that there was limited potential to enhance transport safety by continuing this investigation, and has elected to discontinue it.