Document ID: chunk:federal_register_of_legislation:F2006B06395:body:0
Version: federal_register_of_legislation:F2006B06395
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COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY
 SCHEDULE OF AIRWORTHINESS DIRECTIVES

 Pratt and Whitney Turbine Engines - PW4000 Series

AD/PW4000/4 Low Pressure Turbine Stage 4 Disk 10/99

            Applicability: PW4000 series engines with a Low Pressure Turbine (LPT) Stage 4 disk as specified in FAA AD 99-15-01.

            Requirement: Replace affected LPT Stage 4 Disks in accordance with the technical requirements of FAA AD 99-15-01.

            Note: Pratt and Whitney Service Bulletins PW4ENG 72-657 and PW4G 100-72-105 also refer.

 Compliance: At periods detailed in the Requirement document.

            This Airworthiness Directive becomes effective on 7 October 1999.

            Background: This Directive is prompted by advice that a change in cooling hole geometry on affected LPT disks results in a reduction in cooling air flow to the disk and higher stresses. Higher than normal stress could result in an uncontained disk failure.