AD/DHC-8/104 - Elevator Trim and Gust Lock Chain Failure

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Legislation au F2005L03587 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.

Transport Canada has issued AD CF-2005-38 affecting Bombardier DHC 8 series aircraft.  Canada is the State of Design for this series of aircraft.  CASA has assessed this AD and has issued Australian AD/DHC-8/104, which will become effective on 22 December 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, New Technologies and Systems, 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 was enacted to provide a legislative framework for the regulation of civil aviation in Australia, addressing the need for comprehensive safety and operational standards in the aviation industry. The Act empowers the Governor-General to make regulations for the purposes of ensuring the safety of air navigation, which is a critical aspect of maintaining the integrity and reliability of Australia's civil aviation system. As part of this regulatory framework, the Civil Aviation Safety Regulations 1998 were also enacted to further define the operational standards and safety requirements. One of the key mechanisms within these regulations is the issuance of airworthiness directives (ADs), which serve as a tool for the Civil Aviation Safety Authority (CASA) to mandate specific safety measures for particular types of aircraft or aeronautical products. The objective of these ADs is to ensure the continuing airworthiness of aircraft in accordance with international standards set by the International Civil Aviation Organization (ICAO), thereby fulfilling Australia's obligations under the Convention on International Civil Aviation.

Scope and Application

The Civil Aviation Act 1988, supplemented by the Civil Aviation Safety Regulations 1998, provides the legislative framework for the regulation of airworthiness in Australia. Specifically, regulation 39.001 of these regulations allows the Civil Aviation Safety Authority (CASA) to issue airworthiness directives (ADs) for particular types of aircraft or aeronautical products, ensuring that these directives are in line with the overarching goal of maintaining the safety of air navigation. These ADs are considered legislative instruments, subject to disallowance under the Acts Interpretation Act 1901 and the Legislative Instruments Act 2003. The ADs are often issued in response to obligations under the Convention on International Civil Aviation and are a common form of continuing airworthiness information shared among ICAO Contracting States. In the case of foreign ADs, such as AD CF-2005-38 issued by Transport Canada for Bombardier DHC 8 series aircraft, CASA assesses the relevant information and, if necessary, issues corresponding Australian ADs, such as AD/DHC-8/104, which mandate compliance with the State of Design's requirements. This process does not involve public consultation or a Regulatory Impact Statement, as determined by the Office of Regulatory Review, and the ADs are made by authorised CASA officials in accordance with the Act.

Key Provisions

The main operative sections of the Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998 that are pertinent to the issuance of airworthiness directives (ADs) are sections 98 and 39.001, respectively. Section 98 of the Civil Aviation Act 1988 empowers the Governor-General to create regulations that ensure the safety of air navigation. In accordance with regulation 39.001 of the Civil Aviation Safety Regulations 1998, the Civil Aviation Safety Authority (CASA) can issue ADs for specific types of aircraft or aeronautical products. This regulatory power is further clarified in subregulation 39.001(5), which identifies an AD as a disallowable instrument under the Acts Interpretation Act 1901 and thus a legislative instrument under the Legislative Instruments Act 2003. The obligations imposed by the Act and the Regulations on parties and entities are significant. The State of Design, in this case Canada for the Bombardier DHC 8 series aircraft, has the responsibility to provide continuing airworthiness information and issue ADs. The State of Registry, which is Australia in this scenario, must assess this information and issue an Australian AD if appropriate. CASA, as Australia's national airworthiness authority, is tasked with evaluating the AD issued by the State of Design and determining whether it should be adopted or modified to suit Australian conditions. This ensures that Australian aircraft meet international safety standards as outlined in Annex 8 of the Convention on International Civil Aviation. Failure to comply with the ADs can lead to serious consequences. Although the text does not specify particular offences, the overarching implication is that non-compliance with ADs could result in aircraft being deemed unairworthy, potentially leading to criminal or civil penalties. The Civil Aviation Act 1988 and related regulations provide for a range of penalties for breaches, which could include fines and imprisonment, depending on the severity and impact of the non-compliance. Given the critical nature of airworthiness directives in ensuring the safety of air navigation, regulatory bodies take such breaches very seriously.

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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.