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On 10 November 2009 at around 1900 EST, a Boeing Company 737-467 aircraft, registered VH-TJY, departed Brisbane Airport, Queensland for Melbourne, Victoria. As the aircraft was climbing through 24,000 ft, the flight crew observed abnormal indications associated with the right engine. The aircraft was returned to Brisbane where it landed without further incident.

Engine disassembly and inspection revealed significant damage to the stage-1 low-pressure turbine (LPT). Analysis of the stage-1 LPT blades showed that some blades had sustained levels of thermally-induced microstructural degradation, which may have affected the creep resistance of the alloy and resulted in the blades being susceptible to failure by creep rupture.

Creep rupture was identified as the likely failure mechanism in previous stage-1 LPT blade failures in this engine type investigated by the Australian Transport Safety Bureau and the engine manufacturer. As a result of this occurrence and at the time of writing this report, the engine manufacturer is revising service bulletin SB 72-1113 to expand the range of blade manufacturing batch numbers that had previously been identified as being predisposed to creep-related failure. Blades in the identified batches are to be withdrawn from service as soon as they are next removed from the engine.

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Safety issue

AO-2009-069-SI-01 -  

Turbine blade material susceptible to creep rupture

Material characteristics of some the LPT blades installed in engine 858322 were consistent with a raw material manufacturing cast that had previously been identified as being susceptible to creep rupture

Safety issue details
Issue number:AO-2009-069-SI-01
Who it affects:Operators of aircraft fitted with CFM56 engines
Status:Adequately addressed

General details
Date: 10 November 2009 Investigation status: Completed 
Time: 1930 EST  
Location   (show map):120 km SW of Brisbane Airport Investigation type: Occurrence Investigation 
State: Queensland Occurrence type: Abnormal engine indications 
Release date: 20 July 2011 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-TJY 
Serial number: 28151 
Operator: Qantas 
Type of operation: Air Transport High Capacity 
Damage to aircraft: Minor 
Departure point:Brisbane, Qld
Destination:Melbourne, Vic.
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Last update 14 November 2018