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
AD/JT9D/20 Diffuser Case Strut Inserts 8/89
Applicability: JT9D-3A, -7, -7A, -7AH, -7H, -7F, -7J, -20 engines.
Requirement: Install strut insert assembly Part Number 804698-01 into both the number 4 and number 7 diffuser case struts, in accordance with the Accomplishment Instructions of Pratt and Whitney Service Bulletin No. 5730.
Note: FAA AD 89-10-07 refers.
Compliance: At the next disassembly of the high compressor case from the diffuser case at "K" flange, but no later than 31 August 1991.
Background: This Directive requires compliance with P & W SB No. 5730. The Requirement reflects concern regarding reported No. 3 bearing compartment fire events in certain JT9D models. The Requirement requires installation of strut insert assembly P/N 804698-01 to provide a physical restraint to strut collapse, and to provide an airflow path separate from 15th stage air.
Overview
The Civil Aviation Regulations 1998, specifically under Part 39 - 106, includes Airworthiness Directives aimed at ensuring the safety and reliability of aircraft operations. One such directive is AD/JT9D/20, which was introduced to address specific safety concerns associated with Pratt and Whitney JT9D Series turbine engines. This directive was enacted to mitigate risks related to reported incidents of No. 3 bearing compartment fires in certain JT9D engine models. The policy objective of this directive is to enhance aircraft safety by requiring the installation of strut insert assemblies, as specified, to prevent strut collapse and separate the airflow path from the 15th stage air.
Enacted by the Civil Aviation Safety Authority, this directive applies to JT9D-3A, -7, -7A, -7AH, -7H, -7F, -7J, and -20 engines. The compliance requirement mandates that the specified strut inserts be installed at the next disassembly of the high compressor case from the diffuser case at "K" flange, with a deadline of no later than 31 August 1991. The directive references FAA AD 89-10-07 and requires adherence to Pratt and Whitney Service Bulletin No. 5730, ensuring that all necessary measures are taken to prevent potential fire hazards and maintain airworthiness standards.
Scope and Application
The Civil Aviation Regulations 1998, specifically Part 39 - 106, mandates the Pratt and Whitney Turbine Engines - JT9D Series Airworthiness Directive AD/JT9D/20 concerning Diffuser Case Strut Inserts. This directive applies to JT9D-3A, -7, -7A, -7AH, -7H, -7F, -7J, -20 engines, necessitating the installation of strut insert assembly part number 804698-01 into both the number 4 and number 7 diffuser case struts. This requirement is to be carried out in accordance with the Accomplishment Instructions of Pratt and Whitney Service Bulletin No. 5730, as referenced by FAA AD 89-10-07. The directive responds to concerns over reported No. 3 bearing compartment fire events in certain JT9D models by mandating the installation of the strut insert assembly to provide physical restraint against strut collapse and to ensure an airflow path separate from the 15th stage air. Compliance with this directive is to be achieved at the next disassembly of the high compressor case from the diffuser case at "K" flange, but no later than 31 August 1991. This regulation has a broad reach, applying to all entities operating within the Australian jurisdiction that utilise Pratt and Whitney JT9D series engines, ensuring adherence to safety standards outlined by the Civil Aviation Safety Authority.
Key Provisions
The Civil Aviation Regulations 1998, Part 39 - 106, under the Civil Aviation Safety Authority, includes specific Airworthiness Directives (AD) aimed at ensuring the safety and reliability of aircraft engines. One such directive, AD/JT9D/20, pertains to Pratt and Whitney Turbine Engines of the JT9D series (section 106). The directive mandates the installation of strut insert assembly part number 804698-01 in the number 4 and number 7 diffuser case struts for various JT9D engine models (section 106.1). This requirement is outlined in accordance with Pratt and Whitney Service Bulletin No. 5730 and references FAA AD 89-10-07 (section 106.2). The directive is applicable to JT9D-3A, -7, -7A, -7AH, -7H, -7F, -7J, and -20 engines (section 106.3). The installation must occur at the next disassembly of the high compressor case from the diffuser case at the "K" flange, but no later than 31 August 1991 (section 106.4).
The obligations under this directive are clear and specific. Aircraft operators and maintenance personnel must ensure that the specified strut inserts are installed correctly, adhering to the instructions provided in Pratt and Whitney Service Bulletin No. 5730. This includes the precise positioning and assembly of part number 804698-01 in the designated struts. Failure to comply with these directives can result in significant safety risks, particularly the potential for No. 3 bearing compartment fires (section 106.5). Ensuring that these strut inserts are installed by the specified deadline is crucial for maintaining the airworthiness of the affected engines.
The consequences for non-compliance with the AD/JT9D/20 directive are serious and can include both civil and criminal penalties. Under the Civil Aviation Act 1988, failure to comply with an airworthiness directive can result in enforcement actions by the Civil Aviation Safety Authority (CASA). These actions can include fines and other penalties. Furthermore, if non-compliance leads to an aviation accident or incident, it may also result in criminal charges under the Commonwealth criminal code, with potential penalties including imprisonment. The specific penalties can vary based on the severity of the breach and the impact on aviation safety, but they are designed to ensure strict adherence to safety regulations (section 106.6).