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On 11 April 2007, shortly after takeoff from Wagga Wagga Airport, NSW, the crew of a de Havilland Dash 8 aircraft registered VH-TQY, noticed an unusual popping sound, followed by a slight vibration through the power levers. On passing 3,800 ft there was a significant drop in torque on the left engine, with associated popping noise. The crew shut down the engine and returned to Wagga Wagga Airport. After initial inspection on the wing, the engine was removed and sent to the manufacturer for disassembly and examination.

The examination found that the engine's number-5 bearing, the high pressure (HP) turbine disc and stub-shaft had failed. These components were sent to the Australian Transport Safety Bureau for further examination. That examination determined the number-5 bearing had failed at its roller cage through fatigue cracking, the stub-shaft had failed under overload and the HP turbine disc had suffered blade tip rubbing.

The operator had experienced a previous number-5 bearing failure on another of its engines. That bearing displayed the same failure pattern of its roller cage and was consecutively serial numbered to the VH-TYQ engine's number-5 bearing.

As a result of this investigation, the engine manufacturer identified a batch of 15 bearings that required replacement and introduced procedures to minimise the risk of further number-5 bearing failures.

Download Final Report
[ Download PDF: 478KB]
 
 
 
 
General details
Date: 11 April 2007 Investigation status: Completed 
Time: 1315 EST Investigation type: Occurrence Investigation 
Location   (show map):5NM northeast of Wagga Wagga Occurrence type:Engine failure or malfunction 
State: New South Wales Occurrence class: Technical 
Release date: 12 June 2008 Occurrence category: Incident 
Report status: Final Highest injury level: None 
 
Aircraft details
Aircraft manufacturer: de Havilland Canada 
Aircraft model: DHC-8 
Aircraft registration: VH-TQY 
Serial number: 552 
Type of operation: Air Transport High Capacity 
Damage to aircraft: Nil 
Departure point:Wagga Wagga, NSW
Destination:Sydney, NSW
Crew details
RoleClass of licenceHours on typeHours total
Pilot-in-CommandATPL
 
 
 
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Last update 13 May 2014