Aviation safety investigations & reports

In-flight engine malfunction and air turn-back - Boeing 737-476, VH-TJY, 120 km SW of Brisbane Airport, 10 November 2009

Investigation number:
AO-2009-069
Status: Completed
Investigation completed

Summary

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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 Blades in the identified batches are to be withdrawn from service as soon as they are next removed from the engine.

Download Final Report
[Download  PDF: 1.07MB]
 
 
Alternate: [Download  DOC: 1.82MB]
 

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Safety Issue

Go to 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   Investigation level: Complex - click for an explanation of investigation levels  
Location   (show map): 120 km SW of Brisbane Airport    
State: Queensland   Occurrence type: Abnormal engine indications  
Release date: 20 July 2011   Occurrence category: Incident  
Report status: Final   Highest injury level: None  

Aircraft details

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.  
Last update 14 November 2018