AD/DHA-3/24 Amdt 1 - Tailplane Spar and Elevator Hinge Stiffener Bracket - Inspection - CANCELLED

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Legislation au F2008L04032 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/DHA-3/24 Amdt 1 affecting all De Havilland DHA-3 (Drover) models Mk.2, 3 and 3A aeroplanes.  CASA has assessed this AD and as a result has cancelled Australian AD/DHA-3/24 Amdt 1.  The cancellation will become effective on 20 November 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 Australian Parliament, governs the regulation and oversight of civil aviation in Australia, with a focus on ensuring the safety of air navigation. Under this Act, the Civil Aviation Safety Regulations 1998 were established, which include provisions for the issuance of airworthiness directives (ADs) by the Civil Aviation Safety Authority (CASA) to address safety concerns related to aircraft and aeronautical products. The ADs are legislative instruments that must comply with the Acts Interpretation Act 1901 and the Legislative Instruments Act 2003. The objective of these regulations is to ensure the continuing airworthiness of aircraft and aeronautical products, aligning with Australia's obligations under the Convention on International Civil Aviation and the responsibilities of the State of Design and State of Registry for aircraft airworthiness. CASA, as Australia's national airworthiness authority, plays a critical role in assessing and issuing ADs based on international and national standards.

Scope and Application

The Civil Aviation Act 1988, supplemented by the Civil Aviation Safety Regulations 1998, applies to all entities and individuals involved in civil aviation within Australia, encompassing aircraft, aeronautical products, and related industries. Specifically, regulation 39.001 empowers the Civil Aviation Safety Authority (CASA) to issue airworthiness directives (ADs) concerning certain types of aircraft or aeronautical products, thereby ensuring compliance with safety standards. These ADs, which are legislative instruments under the Legislative Instruments Act 2003, are crucial for maintaining the continuing airworthiness of aircraft as mandated by the Convention on International Civil Aviation. CASA, as Australia’s national airworthiness authority, assumes the responsibility of assessing and implementing these directives, which may be issued by the State of Design or other contracting states, to ensure that Australian-registered aircraft meet international safety standards. The application of these regulations extends nationally, reflecting Australia's commitment to international aviation safety standards, and operates within the framework of both national legislation and international agreements.

Key Provisions

The key operative sections of the Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998 pertain to the issuance and management of airworthiness directives (ADs). Under section 98 of the Act, the Governor-General is empowered to make regulations for air safety, while regulation 39.001 of the Civil Aviation Safety Regulations 1998 specifically allows the Civil Aviation Safety Authority (CASA) to issue ADs for certain types of aircraft or aeronautical products. Subregulation 39.001(5) further clarifies that an AD is considered a disallowable instrument, thus a legislative instrument, according to section 46A of the Acts Interpretation Act 1901. These regulations impose several obligations on CASA and other entities involved in airworthiness. The State of Design, which is responsible for the continuing airworthiness of an aircraft type, must provide necessary information to ensure the safety of aircraft registered in other countries, including Australia. Consequently, CASA, as Australia’s national airworthiness authority, must assess the information provided by the State of Design and, if necessary, issue an Australian AD to enforce the required safety measures. This process ensures that the continuing airworthiness of individual aircraft is maintained in accordance with international standards. Breaches of the regulations or non-compliance with ADs can lead to significant consequences. Under the Civil Aviation Act 1988, violations can result in both civil and criminal penalties. Civil penalties may include fines, while criminal penalties can encompass imprisonment, reflecting the seriousness of safety breaches in the aviation sector. The maximum penalties for such offences are determined by the specific provisions of the Act and associated regulations, with the exact amount depending on the nature and severity of the offence. In summary, the Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998 provide a robust framework for the issuance and enforcement of ADs to maintain air safety. CASA has the authority to issue ADs and cancel them when necessary, reflecting Australia’s commitment to international safety standards. Failure to comply with these directives can result in severe penalties, underscoring the importance of adhering to these regulations.

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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.