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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 24 October 2014, the ATSB commenced an investigation into a loss of separation assurance involving an Embraer EMB-135, registered VH-JTG, and an Airbus A321, registered VH-VWX, overhead Taroom Aerodrome, Queensland on 21 October 2014.

Examination of the information collected during the investigation indicated that the aircraft were assigned the same flight level on crossing tracks resulting in a loss of separation assurance. VH-JTG passed in front of VH-VWX and separation reduced to 6.6 NM (12 km). The lateral separation standard at the time was 5 NM (9 km) and there was no Short Term Conflict Alert (STCA) or other alert issued, including by the aircraft’s systems.

The ATSB did not identify any organisational or systemic issues that contributed to the incident and assessed that no safety issues would be identified through further investigation. On that basis, the ATSB has decided to discontinue its investigation.

General details
Date: 21 October 2014 Investigation status: Discontinued 
Time: 06:28 EST  
Location   (show map):overhead Taroom Airport Investigation type: Occurrence Investigation 
State: Queensland Occurrence type: Loss of separation assurance 
Release date: 03 December 2014 Occurrence class: Operational 
Report status: Discontinued Occurrence category: Incident 
Anticipated completion: 1st Quarter 2015 Highest injury level: None 
Aircraft 1 details
Aircraft manufacturer: Embraer-Empresa Brasileira De Aeronautica 
Aircraft model: EMB-135LR 
Aircraft registration: VH-JTG 
Serial number: 145687 
Type of operation: Charter 
Sector: Jet 
Damage to aircraft: Nil 
Departure point:Brisbane, Qld
Destination:Osborne, Qld
Aircraft 2 details
Aircraft manufacturer: Airbus 
Aircraft model: A321-231 
Aircraft registration: VH-VWX 
Serial number: 3899 
Operator: Jetstar Airways 
Type of operation: Air Transport High Capacity 
Sector: Jet 
Damage to aircraft: Nil 
Departure point:Sydney, NSW
Destination:Cairns, QLD
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Last update 14 November 2018