AD/AL 250/66 Amdt 2 - Second Stage Turbine Wheel
1AD/AL 250/66 Amdt 2 - Second Stage Turbine Wheel
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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 250/66
Amdt 2
Second Stage Turbine Wheel 12/89
Applicability: Allison model 250-C30, C30L, C30M, C30P, C30S engines.
Requirement: Install a second stage turbine wheel P/N 23032280 in accordance with the requirements of Allison Alert Service Bulletin CEB-A-72-3132, or CEB-A-72-3137 Rev.2 as applicable.
Note: This Directive should be carried out in conjunction with CAO 106 AD/AL 250/64 Amdt 3. FAA AD 86-19-12 refers.
Compliance: As detailed in Requirement document.
Background: This Directive has been amended to increase the engine models and helicopters affected. The requirement to install a higher burst speed second stage turbine wheel is now applicable to all C30 series engines, regardless of the type of helicopter to which the engine is fitted.