AD/DHC-2/4 - Undercarriage Legs - Anti-Corrosion Treatment - CANCELLED

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Legislation au F2008L03635 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. 

The Civil Aviation Safety Authority or its predecessors issued AD/DHC-2/4 affecting de Havilland DHC-2 (Beaver) model aeroplanes.  CASA has assessed this AD and as a result has cancelled Australian AD/DHC-2/4.  The cancellation will become effective on 23 October 2008.  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 Parliament of Australia, serves to regulate the aviation industry in the interests of safety and efficiency. This legislation, through the Civil Aviation Safety Regulations 1998, empowers the Civil Aviation Safety Authority (CASA) to issue airworthiness directives (ADs) for specific types of aircraft or aeronautical products. These ADs, as legislative instruments, are instrumental in ensuring that aircraft and aeronautical products maintain their airworthiness, aligning with Australia's obligations under international conventions such as the Convention on International Civil Aviation. Notably, the cancellation of a particular AD affecting de Havilland DHC-2 (Beaver) model aeroplanes, as detailed in the explanatory statement, reflects CASA's commitment to international standards and the continuous improvement of aviation safety. The process of issuing and cancelling ADs is carried out in accordance with the Act, without the need for public consultation or a Regulatory Impact Statement, highlighting the streamlined approach to addressing safety issues in the aviation sector.

Scope and Application

The Civil Aviation Safety Regulations 1998, under section 39.001, empowers the Civil Aviation Safety Authority (CASA) to issue airworthiness directives (ADs) concerning specific types of aircraft or aeronautical products. These ADs are integral to maintaining the continuing airworthiness of aircraft and are required by Annex 8 of the Convention on International Civil Aviation. Each State of Design has the responsibility to ensure the airworthiness of the aircraft they design, and this responsibility includes providing necessary information to the States of Registry. Conversely, the State of Registry is tasked with ensuring the airworthiness of individual aircraft. The ADs serve as a critical mechanism for this ongoing oversight. In Australia, CASA has the authority to issue such directives, and any such directive is considered a legislative instrument under the Legislative Instruments Act 2003. For instance, CASA issued AD/DHC-2/4 for de Havilland DHC-2 (Beaver) model aeroplanes but subsequently cancelled it on 23 October 2008, as the unsafe condition it addressed no longer existed. This cancellation reflects Australia's adherence to international obligations under the Convention on International Civil Aviation, and no public consultation was necessary as per the Office of Best Practice Regulation's determination that ADs do not require a Regulatory Impact Statement.

Key Provisions

The main operative sections of the Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998, specifically Regulation 39.001, provide the framework for the issuance of airworthiness directives (ADs) (sections 98 and 39.001). Regulation 39.001(5) indicates that ADs are legislative instruments that are disallowable under section 46A of the Acts Interpretation Act 1901, and thus fall under the oversight of the Legislative Instruments Act 2003. In this case, Australian AD/DHC-2/4, which pertains to de Havilland DHC-2 (Beaver) model aeroplanes, has been cancelled, effective 23 October 2008, due to Australia’s obligations under the Convention on International Civil Aviation. This cancellation was made by the Manager, Airframe and Structures, in the Airworthiness Engineering Group, on behalf of the Civil Aviation Safety Authority (CASA), in accordance with subsection 84A(2) of the Act. The obligations and requirements imposed by this Act and the accompanying regulations are primarily centred around ensuring the continuing airworthiness of aircraft. The State of Design, under Annex 8 to the Convention on International Civil Aviation, is responsible for providing necessary information to ensure the continuing airworthiness of an aircraft type to the appropriate States of Registry. The State of Registry, in turn, must develop or adopt requirements to ensure the continuing airworthiness of aircraft registered within its jurisdiction. In Australia, CASA has the authority to issue ADs to address specific safety issues and ensure compliance with airworthiness standards. These ADs serve as critical instruments for maintaining and improving the safety of aircraft operations. In terms of offences, penalties, or consequences for breach, the Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998 do not explicitly detail the specific penalties for non-compliance with airworthiness directives. However, non-compliance with safety regulations can lead to severe consequences, including potential criminal charges, fines, and other civil penalties. The severity of the penalties may depend on the nature and extent of the non-compliance, and whether it results in an actual or potential risk to safety. CASA has the authority to enforce compliance through various means, including audits, inspections, and legal action. Overall, the Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998 establish a comprehensive framework for the issuance and enforcement of airworthiness directives in Australia, with the primary goal of ensuring the safety of air navigation. The cancellation of Australian AD/DHC-2/4 reflects the commitment to adhering to international standards and obligations under the Convention on International Civil Aviation, as well as the ongoing efforts to maintain the highest levels of safety in the aviation industry.

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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.