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On 25 August 2005, while on a scheduled flight from Brisbane, Qld, to Sydney, NSW, a Boeing 737-476 aircraft, registration VH-TJX, experienced an in-flight engine malfunction approximately 6 km SSE of Sydney Airport.

An inspection of the left engine by the operator's engineering personnel revealed damage within the high pressure compressor (HPC). The left engine, a General Electric CFM56-3C1, was subsequently removed and disassembled at the operator's maintenance facility. The teardown revealed that a single dowel pin had come loose from its installed position within stage-three of the HPC and was ingested by the downstream rotating hardware, resulting in damage to the HPC rotor and stator components.

Further examination of the HPC stator components revealed that the dowel pin had come loose due to excessive clearance and recession of the stage-three stator shroud anti-rotation pins.

As a result of this occurrence, the engine manufacturer, General Electric, initiated a number of safety actions that included a redesign of the HPC anti-rotation pin. The manufacturer also released an alert Service Bulletin CFM56-3 S/B 72-1091 to all operators and maintainers of CFM56-3 engines that recommended the introduction of the new pin design into existing engines. Other safety actions taken included amendments to the CFM56-3 maintenance manual for HPC stator shroud component inspections.

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General details
Date: 25 August 2005 Investigation status: Completed 
Time: 0721 EST  
Location   (show map):6km SSE Sydney Aerodrome Investigation type: Occurrence Investigation 
State: New South Wales Occurrence type: Engine failure or malfunction 
Release date: 24 January 2008 Occurrence class: Technical 
Report status: Final Occurrence category: Incident 
 Highest injury level: None 
Aircraft details
Aircraft manufacturer: The Boeing Company 
Aircraft model: 737 
Aircraft registration: VH-TJX 
Type of operation: Air Transport High Capacity 
Departure point:Brisbane, Qld
Destination:Sydney, NSW
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Last update 16 February 2016