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Discontinued Investigation

Statement of Reasons

Occurrence investigations commenced from 1 July 2003 are initially categorised as category 4 unless agreed by the ATSB Executive to be above this level at the outset. As detailed in Section 21 (2) of the TSI Act 2003, the Executive Director is empowered to discontinue an investigation at any time. Section 21 (3) of the TSI Act 2003 requires the Executive Director to publish a statement setting out the reasons for discontinuing an investigation (commenced from 1 July 2003) within 28 days of discontinuing the investigation. To obtain a copy of the Brief Print Public for Discontinued Investigations prior to 1 July 2003 send a request via email to the ATSB information line.


The Saab SF-340B aircraft registered VH-TRX departed Dubbo, NSW on climb to flight level (FL) 170. Passing FL156 the crew reported that the aircraft had encountered ice and turbulence so they descended the aircraft to FL130. Given earlier serious icing incidents in this aircraft type, the ATSB commenced a category 4 investigation to determine if safety was compromised. Following a comprehensive assessment of available information, no safety issues were found to have been involved and appropriate procedures were followed by the crew.

Status: Downgraded the occurrence to category 5 and investigation discontinued.

General details
Date: 10 September 2005 Investigation status: Discontinued 
Time: 1430 EST  
Location   (show map):93 km SE Dubbo, Aerodrome Investigation type: Safety Issue Investigation 
State: New South Wales Occurrence type: Icing 
Release date: 11 September 2005 Occurrence class: Environment 
Report status: Discontinued Occurrence category: Incident 
 Highest injury level: None 
Aircraft details
Aircraft manufacturer: S.A.A.B. Aircraft Co 
Aircraft model: 340 
Aircraft registration: VH-TRX 
Type of operation: Air Transport Low Capacity 
Damage to aircraft: Nil 
Departure point:Dubbo, NSW
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Last update 16 February 2016