Commonwealth legislation

AD/JT9D/31 Amdt 1 - 14th and 15th Stage HPC Disks

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Commonwealth

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legislative instrument

Plain English Summary

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This Airworthiness Directive requires operators of Pratt & Whitney JT9D-59A, -70A, -7Q, -7Q3 and -7R4 engines that incorporate 14th and 15th stage high‑pressure compressor (HPC) disks to inspect and, if necessary, replace those disks following the technical procedures of FAA AD 98‑21‑22R1 and related P&W service bulletins. It is effective 10 August 2000. Operators pay for inspections and replacements; the CASA delegate enforces compliance by mandating the FAA‑referenced procedures (Applicability; Requirement; Compliance; Background).

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Current sections

Direct links to the current provisions in AD/JT9D/31 Amdt 1 - 14th and 15th Stage HPC Disks.

AD/JT9D/31 Amdt 1 - 14th and 15th Stage HPC Disks

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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

AIRWORTHINESS DIRECTIVE

View image in the official source

View image in the official source
For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/JT9D/31 and issues the following AD under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

AD/JT9D/31

Amdt 1

14th and 15th Stage HPC Disks 8/2000

Applicability: Pratt and Whitney JT9D-59A, -70A, 7Q, -7Q3, and JT9D-7R4 series engines incorporating 14th and 15th stage high pressure compressor disks as detailed in FAA AD 98-21-22R1.

Requirement: Inspect and replace as necessary 14th and 15th stage high compressor disks in accordance with the technical requirements of FAA AD 98-21-22R1.

Note: P&W Alert SBs JT9D-7R4-72-524, Rev1 and A6232, Rev 2, also refer.

Compliance: Initial and repeat instructions, as detailed in the Requirement document, with the effective date amended to 10 August 2000.

This Airworthiness Directive becomes effective on 10 August 2000.

Background: This Directive is prompted by reports of disk bore cracks detected in certain 14th and 15th stage HPC disks during engine shop visits. Such cracks could result in an uncontained engine failure and damage to the aircraft.

This amendment updates the Requirement document to reference the latest revision of FAA AD 98-21-22. AD 98-21-22R1 makes reference to specific P&W NDI procedures and provides a revised definition of an engine shop visit that is less onerous than originally specified.

The original issue of this AD became effective on 28 January 1999.

Signature of Eugene Paul Holzapfel Delegate of the Civil Aviation Safety Authority

Eugene Paul Holzapfel

Delegate of the Civil Aviation Safety Authority 23 June 2000

View image in the official source

The above AD is notified in the Commonwealth of Australia Gazette on 12 July 2000.

Source text

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

1 AD/JT9D/31 Amdt 1 - 14th and 15th Stage HPC Disks

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

Pratt and Whitney Turbine Engines - JT9D Series

AIRWORTHINESS DIRECTIVE

For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/JT9D/31 and issues the following AD under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

AD/JT9D/31

Amdt 1

14th and 15th Stage HPC Disks 8/2000

Applicability: Pratt and Whitney JT9D-59A, -70A, 7Q, -7Q3, and JT9D-7R4 series engines incorporating 14th and 15th stage high pressure compressor disks as detailed in FAA AD 98-21-22R1.

Requirement: Inspect and replace as necessary 14th and 15th stage high compressor disks in accordance with the technical requirements of FAA AD 98-21-22R1.

Note: P&W Alert SBs JT9D-7R4-72-524, Rev1 and A6232, Rev 2, also refer.

Compliance: Initial and repeat instructions, as detailed in the Requirement document, with the effective date amended to 10 August 2000.

This Airworthiness Directive becomes effective on 10 August 2000.

The original issue of this AD became effective on 28 January 1999.

Eugene Paul Holzapfel

Delegate of the Civil Aviation Safety Authority 23 June 2000

The above AD is notified in the Commonwealth of Australia Gazette on 12 July 2000.