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Safety Action

Summary

Local safety action

In April 2001, in response to this occurrence, the operator reduced the high-pressure turbine inspection interval, requiring the turbine to be inspected at intervals not exceeding 625 hours.

ATSB safety action

As a result of this occurrence, the Australian Transport Safety Bureau makes the following recommendations:

R20010121

The Australian Transport Safety Bureau recommends that General Electric Aircraft Engines:

a) Review the suitability of using Inconel 625 alloy consumables during the weld repair of high-pressure turbine blades.

b) Review the life estimate and inspection intervals for high-pressure turbine blades repaired under the procedures using Inconel 625 alloy consumables.

c) Notify all operators using CFM56-2C, CFM56-2A/2B, CFM56-3 or similar engines of the possibility of catastrophic engine failure due to failure of high-pressure turbine blades repaired using Inconel 625 alloy consumables.

R20010122

The Australian Transport Safety Bureau recommends that the US Federal Aviation Administration:

a) Review the life estimate and inspection intervals for high-pressure turbine blades repaired under the procedures using Inconel 625 alloy consumables.

b) Notify all operators using CFM56-2C, CFM56-2A/2B, CFM56-3 or similar engines of the possibility of catastrophic engine failure due to failure of high-pressure turbine blades repaired using Inconel 625 alloy consumables.

R20010123

The Australian Transport Safety Bureau recommends that the Civil Aviation Safety Authority notify all operators using CFM56-2C, CFM56-2A/2B, CFM56-3 or similar engines of the possibility of catastrophic engine failure due to failure of high-pressure turbine blades repaired using Inconel 625 alloy consumables.

 
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