Commonwealth legislation

AD/JT9D/12 Amdt 1 - Fifteenth Stage Compressor Discs

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Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

This Airworthiness Directive requires inspection of 15th‑stage compressor discs (P/Ns 658615, 672915) on specified Pratt & Whitney JT9D variants in accordance with P&W Service Bulletin No. 4908 Rev.1, which cuts the initial inspection threshold from 6,500 to 3,500 cycles. It affects aircraft operators, maintenance organisations and parts suppliers — increasing near‑term inspections, scheduling burden and costs for operators while aligning the AD with the manufacturer’s latest guidance.

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AD/JT9D/12 Amdt 1 - Fifteenth Stage Compressor Discs

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COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source Pratt and Whitney Turbine Engines - JT9D Series

AD/JT9D/12

Amdt 1

Fifteenth Stage Compressor Discs 9/89

Applicability: JT9D-3A, -7, -7A, -7H, -7AH, -7A(SP), -7F, -7J, -20, -20J.

Requirement: Inspect 15th stage compressor discs P/N 658615 and 672915 in accordance with the requirements of PWA SB No.4908 Rev.1.

Compliance: As detailed in the Requirement document.

Background: This Directive has been amended to reflect the manufacturers latest revision to S.B.

The revision, in part, reduces the initial inspection requirement from 6,500 cycles to 3,500 cycles.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.