Aviation safety investigations & reports

In-flight engine failure, 9km NE Wagga Wagga, NSW, de Havilland Canada Dash 8, VH-TQY, 11 April 2007

Investigation number:
Status: Completed
Investigation completed


Download Final Report
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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    
Location   (show map): 5NM northeast of Wagga Wagga    
State: New South Wales   Occurrence type: Engine failure or malfunction  
Release date: 12 June 2008   Occurrence category: Incident  
Report status: Final   Highest injury level: None  

Aircraft details

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
Role Class of licence Hours on type Hours total
Pilot-in-Command ATPL
Last update 18 April 2018