AD/ALF/4 - Compressor Vanes, Turbine Blades and Turbine Nozzle - Inspection and Replacement (Cth)
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COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
AlliedSignal (Lycoming) Turbine Engines - ALF502 and LF507 Series
AD/ALF/4 Compressor Vanes, Turbine Blades and Turbine Nozzle - Inspection and Replacement
Applicability: Lycoming Turbo Fan Engine Models ALF 502-L/L2 and ALF 502-R3/R4. Document: 1. Avco Lycoming SB ALF 502-72-0012, Rev. 2.
2. Avco Lycoming SB ALF 502-72-0025, Rev. 1.
3. Avco Lycoming SBALF 502-72-0027.
4. Avco Lycoming SBALF 502-72-0021; or
5. AD/LYC-T/21.
Note: FAA AD 82-25-10 Amendment 39-4511 refers.
1/86
Compliance: In accordance with requirement documents.
Background: There have been reports of engine failures and loss of power on ALF 502-L/L2 engines caused by separation of first stage compressor vane airfoils and fourth stage turbine blades in addition there has been a non contained fourth stage turbine blade failure.
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