AD/JT8D/20 Amdt 2 - Combustion Chamber Cans

Overview

The Civil Aviation Regulations 1998, specifically Part 39 - 106, addresses the safety and airworthiness standards for aviation operations within Australia. One of the directives under this Act is AD/JT8D/20 Amendment 2, which targets the Pratt and Whitney JT8D series turbine engines. This directive was enacted to address potential issues with combustion chamber liners, particularly cracking, in certain models of JT8D engines. The problem this legislation seeks to resolve is the maintenance and safety of these engines, ensuring they meet required safety standards and operational reliability through regular inspections. The Civil Aviation Safety Authority (CASA) is the enacting body, aiming to safeguard public safety by enforcing strict compliance with airworthiness directives. The policy objective is to prevent engine failures and ensure that all aircraft using JT8D engines adhere to the latest safety standards as outlined by Pratt and Whitney and approved by CASA. This amendment to the directive updates the procedure to align with Pratt and Whitney's latest Service Bulletin (SB) 5639, Revision 10, and references the latest revision of the Federal Aviation Administration's (FAA) Directive AD 86-09-02 Revision 2. The directive requires inspections of combustion chamber liners to be conducted unless otherwise specified, with the aim of monitoring the in-service condition of the engines effectively. This ensures that all JT8D engines, which have accumulated a specific time since new, since repair, or since the last inspection, are thoroughly examined to maintain their airworthiness and prevent potential safety hazards.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 106, governs the applicability and enforcement of airworthiness directives across Australia, ensuring that aircraft and their components meet stringent safety standards. One such directive, AD/JT8D/20 Amendment 2, pertains to Pratt and Whitney JT8D series turbine engines equipped with combustion chamber cans other than P/N 5001958-02/-022 or 5001959-02/-022. This directive applies to all entities and persons responsible for the operation and maintenance of such engines, mandating them to inspect the combustion chamber liners for any signs of cracking as outlined in Pratt and Whitney Service Bulletin 5639, Revision 10, or as approved by the Civil Aviation Safety Authority (CASA). The directive does not specify a geographic limitation, thereby applying to all jurisdictions within Australia. This mandate is critical to ensuring that the engines maintain their airworthiness and safety standards, with compliance expected unless otherwise noted in the requirement document. The directive references a corresponding Federal Aviation Administration (FAA) directive to ensure alignment with international safety practices and standards.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 106, mandate the application of airworthiness directives issued by the Civil Aviation Safety Authority (CASA) (section 39.106). One such directive, AD/JT8D/20, pertains to Pratt and Whitney Turbine Engines of the JT8D Series, focusing on the inspection of combustion chamber cans. This directive applies to all JT8D models equipped with combustion chamber cans other than P/N 5001958-02/- 022 or 5001959-02/-022 (section 39.106(1)). The primary requirement of this directive is to inspect the combustion chamber liners for any signs of cracking, in accordance with Pratt and Whitney (P&W) Service Bulletin (SB) 5639, Revision 10, or as otherwise approved by CASA (section 39.106(2)). The obligations imposed by this directive are straightforward yet critical. Operators of the specified engines must ensure that inspections are conducted at intervals defined by the accumulated time since new, since repair, or since the last inspection, to maintain the safety and airworthiness of the aircraft. These inspections must adhere to the specifications laid out in the P&W SB 5639, Revision 10, or an equivalent method approved by CASA (section 39.106(3)). Compliance with this directive is mandatory, and it became effective on 25 April 1996, unless otherwise noted in the requirement document (section 39.106(4)). Failure to comply with the AD/JT8D/20 directive can lead to significant consequences. Non-compliance with airworthiness directives is a breach of the Civil Aviation Regulations, potentially leading to penalties under the Civil Aviation Act 1988. Such penalties may include fines, suspension or revocation of an aircraft’s certificate of airworthiness, or even criminal charges in cases of gross negligence. The severity of penalties can vary, but the overarching aim is to ensure the safety and integrity of civil aviation operations in Australia (section 39.106(5)).