Document ID: chunk:federal_register_of_legislation:F2006B06394:body:0
Version: federal_register_of_legislation:F2006B06394
Segment Type: other
Provision Reference: 
Character Range: 0–1451

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/PW4000/2 2nd Stage HPT Rotating Airseal 1/99

 Applicability: PW4000 series engines.

             Requirement: 1. Inspect 2nd stage high pressure turbine rotating airseals in accordance with Pratt and Whitney Alert Service Bulletins, PW4ENG A72-628, Rev. 1, and PW4G-100- A72-80, Rev. 1, as applicable.

             2. Modify 2nd stage ring segments and vane clusters, and install improved 2nd stage high pressure turbine rotating seals in accordance with Pratt and Whitney Service Bulletins PW4ENG 72-636, PW4ENG 72-637, PW4G-10- 72-93, and PW4G-100- 72-94, as applicable.

            Incorporation of these modifications and installation of an improved 2nd stage HPT rotating airseal constitutes terminating action for Requirement 1 of this Directive.

            Note: FAA AD 98-19-03 also refers.

 Compliance: 1. At each occasion the HPT is disassembled after the effective date of this Directive.

            2. Within 6 years after the effective date of this Directive.

            This Airworthiness Directive becomes effective on 28 January 1999.

            Background: This Directive is prompted by reports of 2nd stage HPT rotating airseal cracking which could result in an uncontained engine failure and damage to an aircraft.