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.
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.
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.
Overview
The Civil Aviation Regulations 1998, enacted by the Parliament of the Commonwealth of Australia, aim to ensure the safety of civil aviation in Australia. One specific legislative instrument under this Act, F2006B11025, addresses safety concerns related to Pratt and Whitney JT9D series turbine engines. This Airworthiness Directive was introduced to address the issue of disk bore cracks in the 14th and 15th stage high pressure compressor disks, which could potentially result in uncontained engine failure and damage to the aircraft. The directive, issued by the Civil Aviation Safety Authority (CASA), requires the inspection and replacement of affected disks as per the technical requirements outlined in FAA AD 98-21-22R1, with the aim of maintaining airworthiness standards and ensuring the safety of air travel.
Scope and Application
The Civil Aviation Regulations 1998, under Part 39, specifically address the safety of aircraft and aeronautical products, with Airworthiness Directives (ADs) playing a crucial role in maintaining safety standards. This legislative instrument, AD/JT9D/31, applies to Pratt and Whitney JT9D-59A, -70A, 7Q, -7Q3, and JT9D-7R4 series engines equipped with 14th and 15th stage high pressure compressor disks as defined in FAA AD 98-21-22R1. The directive mandates inspections and replacements of the specified disks to mitigate the risk of uncontained engine failure and subsequent aircraft damage, with compliance required according to the detailed instructions set out in FAA AD 98-21-22R1. The AD, effective from 10 August 2000, is issued by the delegate of the Civil Aviation Safety Authority and applies across the Commonwealth of Australia, ensuring that all relevant aircraft and engines meet the specified safety standards.
Key Provisions
The Civil Aviation Regulations 1998, specifically under Part 39, mandate that Airworthiness Directives (AD) be issued to address safety concerns related to aircraft and aeronautical products. Section 39.1 (1) of the CAR 1998 provides the authority for the Civil Aviation Safety Authority (CASA) to issue these directives. In this instance, AD/JT9D/31, which pertains to Pratt and Whitney JT9D series engines, has been amended. The AD requires specific action concerning the 14th and 15th stage high pressure compressor (HPC) disks in certain JT9D engines, including inspection and replacement as necessary. These actions must be carried out in accordance with the technical requirements specified in FAA AD 98-21-22R1, and relevant Pratt & Whitney Service Bulletins (SBs) JT9D-7R4-72-524, Rev1 and A6232, Rev 2.
The AD applies to Pratt and Whitney JT9D-59A, -70A, 7Q, -7Q3, and JT9D-7R4 series engines that incorporate 14th and 15th stage HPC disks as detailed in FAA AD 98-21-22R1. The requirement mandates that these disks must be inspected and replaced if necessary to prevent potential disk bore cracks, which could lead to uncontained engine failure and subsequent damage to the aircraft. The compliance section outlines the timeline for these inspections, which were initially set out in the requirement document but have been updated to reflect an effective date of 10 August 2000. The AD was originally issued on 28 January 1999 and amended on 8 August 2000.
Failure to comply with the requirements of the AD could result in severe consequences. Non-compliance with airworthiness directives can lead to civil penalties under the Civil Aviation Act 1988, which includes fines and potential criminal charges. The severity of the penalties can depend on the circumstances of the breach, but it is clear that adherence to these directives is crucial to maintain aviation safety standards. The AD was notified in the Commonwealth of Australia Gazette on 12 July 2000, ensuring that all relevant parties are informed of the new requirements and their obligations under the amended directive.