AD/ALF/4 - Compressor Vanes, Turbine Blades and Turbine Nozzle - Inspection and Replacement

Administered by Department of Infrastructure, Transport, Regional Development, Communications, Sport and the Arts

Legislation au F2006B02318 In force Legislative Instrument

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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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Sourced from the Federal Register of Legislation at 26 August 2026. For the latest information on Australian Government law please go to https://www.legislation.gov.au.