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Recommendation issued to: General Electric Usa

Recommendation details
Output No: R20000026
Date issued: 22 February 2000
Safety action status:
Background: Why this Recommendation was developed

Output text

The Australian Transport Safety Bureau (formerly the Bureau of Air Safety Investigation) recommends that the engine manufacturer General Electric review the adequacy of turbine blade manufacturing process controls to reduce the likelihood of blades containing casting defects being released into service.


As a result of investigation into this occurrence, the Bureau simultaneously issues the following recommendation and safety advisory notice:


R20000025

The Australian Transport Safety Bureau (formerly the Bureau of Air Safety Investigation) recommends that the engine manufacturer General Electric identify the source of the casting defect of the failed HPT blade.


SAN20000027

The Federal Aviation Administration should note the safety deficiency identified in this document and take appropriate action.

Initial response
Date issued: 17 May 2000
Response from: General Electric Usa
Action status: Closed - Accepted
Response text:

An audit was conducted of actions or precautions currently being taken to preclude the existence of dross and similar impurities in final castings at the two casting sources utilized for manufacture of the Stage 2 CF6-80A HPT Blade. All procedures were found to conform to GE and internal casting source specifications. Extensive procedures are in place at each source to minimize the likelihood of blades containing casting defects being released into service.

The frequency of problems related to casting anomalies is extremely low. Out of a total of 69,963 Stage 2 CF6-80A HPT blades produced by both casting sources, casting related operational problems have been reported on 4 blades (0.006%).

 
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Last update 05 April 2012