On 31st July the Australian Transport Safety Bureau (ATSB) issued a report into an aviation incident the previous October. At 1500:51 Eastern Daylight-saving Time on 8th October 2011, a breakdown of separation (BOS) occurred 59 km north-east of Armidale, New South Wales between a Boeing 737-8FE (737), registered VHYVA, and a Gulfstream IV (G-IV), registered VH-CGF. VH-YVA was flying Brisbane to Sydney and VH-CGF was en route from Melbourne to Coolangatta, Queensland.