Aviation safety investigations & reports

Powerplant/propulsion event - Launceston Aerodrome, 20 August 2009

Investigation number:
Status: Completed
Investigation completed


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At approximately 1137 EST on 20 August 2009, a Boeing 737-8BK aircraft, registered VH-VOC, departed Launceston, Tasmania on a scheduled passenger service to Sydney, New South Wales. Following takeoff, several loud bangs were heard from the left engine, consistent with a compressor surge. The left engine was reduced to flight idle and the aircraft returned to land at Launceston.

The compressor surge and damage to the left engine was the result of advanced variable stator vane bushing/shroud wear, which caused a seal retainer to dislodge from the inner shroud segment and move into the compressor gas path. The liberated seal segments then progressed downstream, causing significant impact damage to the remaining stages, resulting in a loss of compressor efficiency.

The manufacturer was aware of the propensity for inner bushing wear, and had previously released a number of service bulletins aimed at eliminating the issue.

The operator had incorporated the relevant service bulletins into their inspection and maintenance program as required; however the event occurred prior to the engine reaching the earliest threshold for inspection.

Download Final Report
[Download  PDF: 881KB]
General details
Date: 20 August 2009   Investigation status: Completed  
Time: 1137 EST   Investigation phase:  
Location   (show map): Launceston Aerodrome   Investigation type: Occurrence Investigation  
State: Tasmania   Occurrence type: Powerplant/propulsion - Other  
Release date: 27 July 2010   Occurrence class: Technical  
Report status: Final   Occurrence category: Incident  
  Highest injury level: None  

Aircraft details

Aircraft details
Aircraft manufacturer The Boeing Company  
Aircraft model 737  
Aircraft registration VH-VOC  
Serial number 30623  
Type of operation Air Transport High Capacity  
Damage to aircraft Minor  
Departure point Launceston, Tas.  
Departure time 1137 EST  
Destination Sydney, NSW  
Last update 14 November 2018