AD/HU 369/121 Amdt 2 - Vertical Stabilizer Control System Adapter Tubes

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Legislation au F2008L04173 In force Legislative Instrument

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CIVIL AVIATION ACT 1988

CIVIL AVIATION SAFETY REGULATIONS 1998

ISSUE OF AIRWORTHINESS DIRECTIVE

Under section 98 of the Civil Aviation Act 1988, the Governor-General may make regulations for the purposes of the Act and in the interests of the safety of air navigation.  Under regulation 39.001 of the Civil Aviation Safety Regulations 1998, CASA may issue airworthiness directives (ADs) for kinds of aircraft or aeronautical products.  Subregulation 39.001(5) of the Civil Aviation Safety Regulations 1998 provides that an AD is a disallowable instrument for the purposes of section 46A of the Acts Interpretation Act 1901. Therefore, in accordance with section 6 of the Legislative Instruments Act 2003, an AD is a legislative instrument.

Under Annex 8 to the Convention on International Civil Aviation, the State of Design has overall responsibility for continuing airworthiness of an aircraft type, and must provide any information necessary to ensure the continuing airworthiness of a type to appropriate States of Registry.  ADs (and their equivalents) are the most common form of continuing airworthiness information, and are issued by most ICAO Contracting States.

The State of Registry of an individual aircraft is responsible for its continuing airworthiness.  Under Annex 8, the State of Registry must develop or adopt requirements to ensure the continuing airworthiness of aircraft.  When a State of Design issues an AD against a type of aircraft on the Australian Register, CASA, as Australia’s national airworthiness authority, must assess that information and, if appropriate, issue an Australian AD to mandate the requirements of the State of Design.

The United States FAA issued Emergency AD 2008-22-52 affecting McDonnell Douglas MD 500 and 600 series helicopters.  The United States is the State of Design for these types.  As a result of FAA AD 2008-22-52 superseding FAA AD
2008-18-52, CASA has amended the equivalent Australian AD to AD/HU369/121 Amendment 2.  The amended AD will become effective on 27 October 2008.  This AD cancels and replaces the previous issue.

As this AD is issued because of Australia’s obligations under Convention on International Civil Aviation, and because it is issued in response to an AD raised by the relevant State of Design, no consultation of the Australian public has taken place on this AD.  The Office of Regulatory Review has determined that ADs do not require a Regulatory Impact Statement.

The AD has been made by the Manager, Systems and New Technologies in the Airworthiness Engineering Branch, on behalf of CASA, in accordance with subsection 84A (2) of the Act.

 

Overview

The Civil Aviation Act 1988 was enacted to establish a comprehensive framework for civil aviation in Australia, ensuring the safety, efficiency, and orderly growth of civil aviation within and outside Australia. The Act was designed to address the need for a cohesive legal structure that could regulate and govern the complex and multifaceted nature of civil aviation. It is administered by the Civil Aviation Safety Authority (CASA) under the oversight of the Minister for Infrastructure and Transport. The primary objective of the Act is to ensure that civil aviation in Australia is conducted in a manner that optimises safety, environmental protection, and economic efficiency while also considering the interests of users and the public. The Civil Aviation Safety Regulations 1998, made under the authority of the Civil Aviation Act 1988, provide further detail on the regulatory framework for ensuring the safety of air navigation. Regulation 39.001 of these regulations allows CASA to issue airworthiness directives (ADs) for types of aircraft or aeronautical products, reflecting the international standards set by Annex 8 to the Convention on International Civil Aviation. These ADs are legislative instruments that require the State of Registry to ensure the continuing airworthiness of aircraft. In the case of the United States Federal Aviation Administration (FAA) issuing Emergency AD 2008-22-52 for McDonnell Douglas MD 500 and 600 series helicopters, CASA, as Australia’s national airworthiness authority, amended the corresponding Australian AD to AD/HU369/121 Amendment 2, which became effective on 27 October 2008. This amendment reflects Australia’s obligations under the Convention on International Civil Aviation and ensures compliance with international standards without the need for public consultation.

Scope and Application

The Civil Aviation Safety Regulations 1998, pursuant to section 98 of the Civil Aviation Act 1988, empower the Civil Aviation Safety Authority (CASA) to issue airworthiness directives (ADs) for specific types of aircraft or aeronautical products, thereby ensuring the safety of air navigation. These directives are legislative instruments subject to disallowance under section 46A of the Acts Interpretation Act 1901, and they comply with the provisions of the Legislative Instruments Act 2003. The ADs are mandated by Australia's obligations under the Convention on International Civil Aviation, specifically Annex 8, which assigns the State of Design the responsibility for the continuing airworthiness of an aircraft type and requires it to provide necessary information to States of Registry. In the case of Australia, CASA, as the national airworthiness authority, must assess information from the State of Design and, if necessary, issue corresponding Australian ADs. These ADs apply to all aircraft of the affected type registered in Australia, ensuring compliance with safety standards. The issuance of these ADs does not require public consultation, as they are a direct response to international obligations and the directives issued by the relevant State of Design.

Key Provisions

The main operative sections of the Civil Aviation Safety Regulations 1998, particularly regulation 39.001, allow the Civil Aviation Safety Authority (CASA) to issue airworthiness directives (ADs) for certain types of aircraft or aeronautical products to ensure safety in air navigation. These ADs serve as a means for states to communicate necessary safety information and actions to ensure the continuing airworthiness of aircraft types, which is a key responsibility under Annex 8 to the Convention on International Civil Aviation. Regulation 39.001(5) also clarifies that these ADs are considered disallowable instruments under the Acts Interpretation Act 1901, making them legislative instruments. The obligations and requirements imposed by the Civil Aviation Safety Regulations 1998 on parties, including CASA, involve ensuring the continuing airworthiness of aircraft on the Australian Register. Specifically, CASA must assess any ADs issued by the State of Design and, if appropriate, issue corresponding Australian ADs that mandate the necessary safety measures. This includes adopting or developing requirements to ensure compliance with international standards and obligations under the Convention on International Civil Aviation. The State of Registry is responsible for implementing these ADs, ensuring that all aircraft meet the required safety standards. In terms of legal consequences, any failure to comply with the ADs issued under the Civil Aviation Safety Regulations 1998 can lead to significant penalties. Although the specific penalties are not detailed in the provided text, non-compliance with ADs generally results in enforcement actions by CASA. This can include fines, penalties, or other regulatory actions, which may vary depending on the severity and frequency of the breach. Civil and criminal consequences may also apply, depending on the specific circumstances and the discretion of the regulatory authority. The Civil Aviation Safety Regulations 1998 mandate that CASA assess and implement ADs issued by the relevant State of Design, ensuring the safety of aircraft on the Australian Register. This process is governed by international aviation standards and obligations, particularly those outlined in Annex 8 to the Convention on International Civil Aviation. The text indicates that while public consultation is not required for issuing these ADs, they are subject to disallowance and regulatory scrutiny. This ensures that CASA and other relevant authorities maintain the highest safety standards in aviation.

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Sourced from the Federal Register of Legislation at 26 August 2026. For the latest information on Australian Government law please go to https://www.legislation.gov.au.