AD/DH 83/4 - Streamline Wires

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Legislation au F2005L02790 Not 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 UK CAA has issued AD G-2005-0025 affecting DH 83 model aircraft.  The UK is the State of Design for this type.  CASA has assessed this AD and has issued Australian AD/DH 83/4, which will become effective on 27 October 2005. 

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, Airframes in the Manufacturing, Certification and New Technologies Office, on behalf of CASA, in accordance with subsection 84A (2) of the Act.

Overview

The Civil Aviation Act 1988, enacted by the Commonwealth Parliament, establishes the framework for civil aviation in Australia, with a strong emphasis on ensuring the safety and efficiency of air navigation. The Act empowers the Governor-General to create regulations aimed at maintaining the safety of air navigation, a necessity arising from the need to protect the public and ensure the integrity of civil aviation. The Civil Aviation Safety Regulations 1998, which were formulated under this Act, provide for the issuance of airworthiness directives (ADs) by the Civil Aviation Safety Authority (CASA), thereby facilitating the enforcement of safety standards and ensuring that aircraft remain airworthy. The policy objective underlying these regulations is to align with international standards set by the International Civil Aviation Organization (ICAO), particularly under Annex 8, to ensure a consistent approach to the continuing airworthiness of aircraft across different states.

Scope and Application

The Civil Aviation Act 1988, as supported by the Civil Aviation Safety Regulations 1998, governs the issuance of airworthiness directives (ADs) for aircraft and aeronautical products in Australia. Specifically, section 98 of the Act empowers the Governor-General to make regulations necessary for the safety of air navigation, and regulation 39.001 allows the Civil Aviation Safety Authority (CASA) to issue ADs for certain types of aircraft or aeronautical products. These ADs, which are legislative instruments, are mandated by international standards set forth in Annex 8 to the Convention on International Civil Aviation, where the State of Design is responsible for the continuing airworthiness of an aircraft type. In Australia, CASA, as the national airworthiness authority, must issue corresponding ADs for aircraft on the Australian Register when required by the State of Design. This process is exemplified in the issuance of Australian AD/DH 83/4, which is a response to an AD issued by the UK Civil Aviation Authority concerning DH 83 model aircraft. Exemptions and exclusions from the ADs are not explicitly detailed in the provided text, but the issuance of these directives is governed by the specific requirements and international obligations of the relevant States of Design and Registry.

Key Provisions

The Civil Aviation Act 1988, through section 98, empowers the Governor-General to enact regulations that ensure the safety of air navigation. These regulations include the Civil Aviation Safety Regulations 1998, which, under regulation 39.001, allow the Civil Aviation Safety Authority (CASA) to issue airworthiness directives (ADs) for specific types of aircraft or aeronautical products. Subregulation 39.001(5) further clarifies that ADs are considered disallowable instruments under section 46A of the Acts Interpretation Act 1901, and as such, they are legislative instruments according to section 6 of the Legislative Instruments Act 2003. ADs are a common method of ensuring the continuing airworthiness of aircraft types, as mandated by Annex 8 to the Convention on International Civil Aviation. The State of Design has the primary responsibility for ensuring the airworthiness of an aircraft type and must provide necessary information to States of Registry. The State of Registry, in turn, is responsible for the continuing airworthiness of individual aircraft within their jurisdiction and must develop or adopt requirements to meet this responsibility. The obligations imposed by the Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998 are primarily focused on ensuring the safety and airworthiness of aircraft. CASA, as Australia’s national airworthiness authority, must assess any airworthiness directives issued by the State of Design and, if appropriate, issue corresponding Australian ADs. This process ensures that Australian-registered aircraft comply with international safety standards. For example, the UK Civil Aviation Authority (CAA) has issued an AD affecting DH 83 model aircraft, the State of Design for which is the UK. CASA has assessed this AD and issued Australian AD/DH 83/4, which will become effective on 27 October 2005. Given that this AD is issued in response to an international requirement and to maintain compliance with the Convention on International Civil Aviation, there was no consultation with the Australian public. The Office of Regulatory Review has also determined that such ADs do not require a Regulatory Impact Statement. Breaches of airworthiness directives can lead to significant legal and operational consequences. Under the Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998, failure to comply with an airworthiness directive can result in enforcement actions, including fines and potential criminal charges. The specific penalties for non-compliance can vary, but they are designed to ensure that all aircraft meet the necessary safety standards. CASA is tasked with enforcing these regulations, and it has the authority to take action against operators who fail to comply with ADs. This can include grounding aircraft, imposing financial penalties, and pursuing criminal charges for serious breaches. The severity of the penalties reflects the critical importance of airworthiness directives in maintaining the safety of air navigation.

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Aviation Law
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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.