Commonwealth legislation

AD/JT8D/12 Amdt 2 - High Pressure Compressor Disc Tie Rod Hole

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Jurisdiction

Commonwealth

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legislative instrument

Plain English Summary

3/10 complexity

This amendment requires operators of specified Pratt & Whitney JT8D engine models to inspect 9th–12th stage high‑pressure compressor (HPC) discs at tie‑rod holes in accordance with FAA Airworthiness Directive 95‑16‑07. It applies to aircraft operators and maintenance organisations and became effective 7 July 2005 (Requirement; Compliance). The stated purpose is to detect cracks and prevent uncontained HPC disc failures (Background); compliance creates inspection, repair or replacement costs and a scheduling burden for operators.

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Current sections

Direct links to the current provisions in AD/JT8D/12 Amdt 2 - High Pressure Compressor Disc Tie Rod Hole.

Pratt and Whitney Turbine Engines - JT8D

Pratt and Whitney Turbine Engines - JT8D Series

AD/JT8D/12 Amdt 2	High Pressure Compressor Disc Tie Rod Hole	7/2005

Applicability:	Pratt & Whitney (P&W) JT8D-1, -1A, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17,-17A, -17R, and -17AR turbofan engines.
Requirement:	Inspect 9th through 12th stage High Pressure Compressor (HPC) disks at the tie-rod holes in accordance with the Requirements of Federal Aviation Administration (FAA) Airworthiness Directive (AD) 95-16-07.Note: FAA AD 95-16-07 Amendment 39-9327 refers.
Compliance:	Unless previously accomplished, as per compliance schedule of the FAA AD95-16-07.
	This Amendment becomes effective on 7 July 2005.
Background:	There have been reports of uncontained failure of 9th through 12th HPC discs because of the cracks originating from tie-rod holes. The inspection requirements of this AD are aimed at detection of cracks and prevention of resultant uncontained failures.The current amendment deletes reference to the manufacturer’s document and refers to the FAA AD as part of the harmonisation with the engine certificating Authority requirements.Amendment 1 of this Directive became effective in 1987.

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James Coyne
Delegate of the Civil Aviation Safety Authority

25 May 2005

AD/JT8D/12 Amdt 2

High Pressure Compressor Disc Tie Rod Ho

High Pressure Compressor Disc Tie Rod Hole

7/2005

Source text

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

Pratt and Whitney Turbine Engines - JT8D Pratt and Whitney Turbine Engines - JT8D Series

Pratt and Whitney Turbine Engines - JT8D Series

AD/JT8D/12 Amdt 2	High Pressure Compressor Disc Tie Rod Hole	7/2005

Applicability:	Pratt & Whitney (P&W) JT8D-1, -1A, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17,-17A, -17R, and -17AR turbofan engines.
Requirement:	Inspect 9th through 12th stage High Pressure Compressor (HPC) disks at the tie-rod holes in accordance with the Requirements of Federal Aviation Administration (FAA) Airworthiness Directive (AD) 95-16-07.Note: FAA AD 95-16-07 Amendment 39-9327 refers.
Compliance:	Unless previously accomplished, as per compliance schedule of the FAA AD95-16-07.
	This Amendment becomes effective on 7 July 2005.
Background:	There have been reports of uncontained failure of 9th through 12th HPC discs because of the cracks originating from tie-rod holes. The inspection requirements of this AD are aimed at detection of cracks and prevention of resultant uncontained failures.The current amendment deletes reference to the manufacturer’s document and refers to the FAA AD as part of the harmonisation with the engine certificating Authority requirements.Amendment 1 of this Directive became effective in 1987.

James Coyne
Delegate of the Civil Aviation Safety Authority

25 May 2005

AD/JT8D/12 Amdt 2 - High Pressure Compressor Disc Tie Rod Hole

Plain English Summary

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Current sections

Pratt and Whitney Turbine Engines - JT8D Series

Pratt and Whitney Turbine Engines - JT8D Series

AD/JT8D/12 Amdt 2

AD/JT8D/12 Amdt 2

High Pressure Compressor Disc Tie Rod Hole

High Pressure Compressor Disc Tie Rod Hole

7/2005

7/2005

Source text

Pratt and Whitney Turbine Engines - JT8D Pratt and Whitney Turbine Engines - JT8D Series

Pratt and Whitney Turbine Engines - JT8D Series

AD/JT8D/12 Amdt 2 AD/JT8D/12 Amdt 2

AD/JT8D/12 Amdt 2

High Pressure Compressor Disc Tie Rod Ho High Pressure Compressor Disc Tie Rod Hole

High Pressure Compressor Disc Tie Rod Hole

7/2005 7/2005

7/2005