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Safety Advisory Notice issued to: Federal Aviation Administration

Recommendation details
Output No: SAN19990116
Date issued: 13 August 1999
Safety action status: Closed
Background: Why this Safety Advisory Notice was developed

Output text

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

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


IR19990112

The Bureau of Air Safety Investigation recommends that the engine manufacturer AlliedSignal audit the process employed to manufacture TPE 331 turbine wheel knife-edged seals to determine those factors that may lead to excessive variations in slot corner radii.


IR19990113

The Bureau of Air Safety Investigation recommends that the engine manufacturer AlliedSignal determine the sensitivity of turbine wheel seals to the initiation of fatigue cracks from slot corners, as a function of slot corner radii.


IR19990114

The Bureau of Air Safety Investigation recommends that the engine manufacturer AlliedSignal consider, during engine design and the formulation of continuing airworthiness instructions, the possibility that turbine wheel seal fatigue failure may result in hazardous modes of engine failure.


IR19990115

The Bureau of Air Safety Investigation recommends that the Civil Aviation Safety Authority Australia conduct an audit of that part of the aviation safety system that establishes the operational history of life-limited components, to establish why the operational history of second-stage turbine wheel, p/n 868272-1, s/n P03214C, could not be determined with certainty.

Initial response
Date issued: 15 September 1999
Response from: Federal Aviation Administration (FAA)
Response text:

The office of accident investigation is in receipt of your recommendations concerning "TPE 331 Turbine Wheel".

Your recommendations have been forwarded to the appropriate office for response, which is normally 90 days. Your recommendations have been identified as 99.333 through 99.335, and inquiries should reference these numbers.

You will be kept informed as to the progress and final resolution of your submission. If you have any questions, please contact this office.

 
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Last update 01 April 2011