AD/LA-4/18 - Trim Actuating Cylinder Bracket - Inspection - CANCELLED

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Legislation au F2009L02215 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 Civil Aviation Safety Authority or its predecessors issued AD/LA-4/18 affecting Consolidated Aeronautics, Colonial LA-4 series aeroplanes.  CASA has assessed this AD and as a result has cancelled Australian AD/LA-4/18.  The cancellation will become effective on 2 July 2009.  No replacement AD is required, as the unsafe condition no longer exists.

As this AD has been cancelled because of Australia’s obligations under the Convention on International Civil Aviation, no consultation with the Australian public has taken place on this AD cancellation.  The Office of Best Practice Regulation has determined that ADs do not require a Regulatory Impact Statement.

 

The AD has been made by the Manager, Airframe and Structures, in the Airworthiness Engineering Group, on behalf of CASA, in accordance with subsection 84A (2) of the Act.

Overview

The Civil Aviation Act 1988, enacted by the Commonwealth Parliament, provides the legislative framework for ensuring the safety and efficiency of civil aviation in Australia. One of the critical issues it addresses is the continuing airworthiness of aircraft, ensuring that they remain safe and airworthy throughout their operational life. The Act empowers the Governor-General to create regulations that serve the interests of air navigation safety. Complementing this, the Civil Aviation Safety Regulations 1998 allow the Civil Aviation Safety Authority (CASA) to issue airworthiness directives (ADs) for certain types of aircraft or aeronautical products, as outlined in regulation 39.001. These directives are essential for maintaining the safety standards mandated by the Convention on International Civil Aviation, particularly through Annex 8, which delineates the responsibilities of the States of Design and Registry concerning aircraft airworthiness. The legislative framework ensures that Australia aligns with international standards and obligations, allowing CASA to issue, assess, and, when necessary, cancel ADs to mandate safety requirements.

Scope and Application

The Civil Aviation Act 1988, along with the Civil Aviation Safety Regulations 1998, governs the issuance of airworthiness directives (ADs) to ensure the safety of air navigation. Under this Act and its regulations, the Civil Aviation Safety Authority (CASA) is authorised to issue ADs for specific kinds of aircraft or aeronautical products, thereby establishing requirements to maintain the airworthiness of these aircraft. These ADs are considered legislative instruments, as outlined in the Legislative Instruments Act 2003. The application of these directives extends to all aircraft and aeronautical products registered in Australia, ensuring compliance with both national and international standards as set out in the Convention on International Civil Aviation, particularly Annex 8 which pertains to airworthiness of aircraft. The State of Design holds the primary responsibility for the continuing airworthiness of an aircraft type, and the State of Registry must enforce these requirements within its jurisdiction. The cancellation of an AD, such as the one affecting Consolidated Aeronautics, Colonial LA-4 series aeroplanes, is also conducted under the authority provided by this Act, reflecting the dynamic nature of aviation safety regulations.

Key Provisions

The Civil Aviation Act 1988, particularly section 98, empowers the Governor-General to enact regulations in the interest of air navigation safety. Regulation 39.001 of the Civil Aviation Safety Regulations 1998 enables the Civil Aviation Safety Authority (CASA) to issue airworthiness directives (ADs) for specified types of aircraft or aeronautical products. Subregulation 39.001(5) of the Civil Aviation Safety Regulations 1998 further clarifies that an AD is a disallowable instrument as per section 46A of the Acts Interpretation Act 1901, and thus qualifies as a legislative instrument under section 6 of the Legislative Instruments Act 2003. The obligations under the Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998 place several duties on the parties involved. The State of Design is primarily responsible for ensuring the continuing airworthiness of a particular aircraft type, as outlined in Annex 8 to the Convention on International Civil Aviation. This responsibility includes providing necessary information to the States of Registry to maintain airworthiness. The State of Registry, on the other hand, must establish or adopt requirements to ensure the continuing airworthiness of individual aircraft within its jurisdiction. When an AD is issued by the State of Design for a type of aircraft registered in Australia, CASA must evaluate this information and, if necessary, issue an Australian AD to enforce the requirements of the State of Design. Under the legislative framework, various penalties and consequences may arise from non-compliance with the requirements set forth in the Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998. While the specifics of these penalties are not detailed in the provided text, it is clear that CASA has the authority to issue ADs to ensure compliance with safety standards. Any failure to adhere to these directives could potentially result in safety risks, and CASA may take enforcement actions against non-compliant parties. The maximum penalties for such breaches are not explicitly stated in the text, but they typically include fines, imprisonment, or both, depending on the severity of the violation. The cancellation of the AD/LA-4/18 affecting Consolidated Aeronautics, Colonial LA-4 series aeroplanes, illustrates how CASA manages airworthiness directives. CASA assessed the AD and determined that the unsafe condition no longer existed, leading to the cancellation of the AD effective from 2 July 2009. This cancellation reflects Australia's obligations under the Convention on International Civil Aviation and indicates that no further consultation or regulatory impact assessment was necessary. The AD was made by the Manager, Airframe and Structures, in the Airworthiness Engineering Group, on behalf of CASA, in accordance with subsection 84A(2) of the Act, demonstrating the thorough procedural compliance in the decision-making process.

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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.