AD/AL 250/37 - Third Stage Turbine Wheel - Replacement
1AD/AL 250/37 - Third Stage Turbine Wheel - Replacement
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COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Image unavailable in extracted text Allison Turbine Engines - 250 Series
AD/AL 250/37 Third Stage Turbine Wheel - Replacement 9/79
Applicability: All 250-C28 series engines fitted with third stage turbine wheel P/No. 6898553 or 6898773.
Requirement: Remove affected Part Number Turbines from service.
Note: FAA Emergency AD Dated 19 July 1979 refers.
Compliance: 1. For turbines with more than 300 hours’ time in service - Within 25 hours’ time in service from 9 August 1979.
2. For turbines with less than 300 hours’ time in service - Before reaching 325 hours’ time in service.