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Safety Action

Summary

As a result of this investigation the Australian Transport Safety Bureau has issued the following recommendations:

Recommendation R20040084

The Australian Transport Safety Bureau recommends that Pratt & Whitney plc review the processes used by its Singapore based overhaul joint venture to accomplish VSV ring pin flaring and compliance with service bulletin PW4ENG 72-432, to ensure the processes are appropriate and in accordance with the service bulletin.

Recommendation R20040086

The Australian Transport Safety Bureau recommends that the Civil Aviation Authority of Singapore liaises with Pratt & Witney's Singapore based overhaul joint venture to review the process for accomplishing the ring pin flaring and compliance with the service bulletin PW4ENG72432 to ensure the processes are appropriate and in accordance with the service bulletin.

Recommendation R20040087

The Australian Transport Safety Bureau recommends that Pratt & Whitney plc review Pratt & Whitney PW4000 engine maintenance procedures for ensuring the integrity of high pressure compressor variable stator vane synchronizing ring pins, to ensure that they adequately address and manage the potential for loss of vane arm pin retention.

Recommendation R20040088

The Australian Transport Safety Bureau recommends that the US Federal Aviation Administration review Pratt & Whitney PW4000 engine maintenance procedures for ensuring the integrity of high pressure compressor variable stator vane synchronizing ring pins, to ensure that they adequately address and manage the potential for loss of vane arm pin retention.

 
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