1AD/AL 250/43 Amdt 3 - Second Stage Turbine Nozzle

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Allison Turbine Engines - 250 Series

AD/AL 250/43

Amdt 3

Second Stage Turbine Nozzle 2/90

Applicability: Allison Model 250-C28B, C28C engines fitted with P/N 6898952 second stage turbine nozzles.

Requirement: Modify P/N 6898952 second stage turbine nozzles in accordance with Allison CEB- A-72-2044 Rev 4.

Note: FAA AD 89-23-12 refers.

Compliance: Prior to 31 March 1990. Background: This Directive has been amended to;

Delete reference to CSL 2030 which has been cancelled by the manufacturer, and

2. Require compliance with the requirements of CEB-A-72-2044 Rev 4, and

3. Make reference to FAA AD 89-23-12.

The Amendment follows advice of another P/N 6898952 nozzle failure in service. Failure of the nozzle has resulted in uncontained second stage turbine wheel failure.