AD/CL-600/74 - Horizontal Stabiliser Trim Actuator Secondary Load Path Indicator

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Legislation au F2007L02144 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-2005-04 affecting Bombardier CL-600 model aircraft.  Canada is the State of Design for this type.  CASA has assessed this AD and has issued Australian AD/CL-600/74, which will become effective on 2 August 2007.

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 was enacted to provide a legislative framework for the regulation of civil aviation in Australia, with a primary focus on ensuring the safety of air navigation. The Act empowers the Governor-General to make regulations that serve the interests of aviation safety. In line with this objective, the Civil Aviation Safety Regulations 1998 were introduced, which include provisions for the issuance of airworthiness directives (ADs) by the Civil Aviation Safety Authority (CASA). These directives are essential for maintaining the continuing airworthiness of aircraft and aeronautical products, as stipulated under Annex 8 to the Convention on International Civil Aviation. Given the international nature of aviation and the responsibilities of the State of Design and the State of Registry, CASA must issue corresponding ADs when a State of Design issues an AD for aircraft types registered in Australia. The process for issuing ADs is designed to uphold international standards and obligations, and typically does not involve public consultation due to their technical nature and the necessity to comply with international agreements.

Scope and Application

The Civil Aviation Act 1988, in conjunction with the Civil Aviation Safety Regulations 1998, provides the framework within which the Civil Aviation Safety Authority (CASA) issues airworthiness directives (ADs). The Act applies to any person or entity involved in civil aviation in Australia, including aircraft manufacturers, operators, and maintenance providers. The ADs are designed to ensure the continuing airworthiness of aircraft by mandating compliance with specific safety requirements. These regulations have a national jurisdictional reach, ensuring that all civil aviation activities within Australia are subject to the airworthiness directives issued by CASA. The ADs are legislative instruments, and their issuance is in accordance with the Legislative Instruments Act 2003. The ADs are issued in response to international obligations under the Convention on International Civil Aviation, particularly Annex 8, which pertains to airworthiness of aircraft. Notably, the issuance of ADs does not require public consultation or a Regulatory Impact Statement, as determined by the Office of Regulatory Review. The ADs are issued by CASA, which acts as Australia's national airworthiness authority, in response to directives issued by the State of Design, ensuring alignment with international safety standards.

Key Provisions

The Civil Aviation Safety Regulations 1998, under regulation 39.001, empower the Civil Aviation Safety Authority (CASA) to issue airworthiness directives (ADs) for specified kinds of aircraft or aeronautical products. These directives are issued to ensure the continuing airworthiness of aircraft and are considered legislative instruments under the Legislative Instruments Act 2003. For example, CASA has issued AD/CL-600/74, which will become effective on 2 August 2007, in response to an AD issued by Transport Canada for Bombardier CL-600 model aircraft. The obligations under this regulation require CASA to assess ADs issued by the State of Design and, where necessary, issue corresponding Australian ADs. This is a reflection of Australia’s commitment under Annex 8 to the Convention on International Civil Aviation, which mandates that the State of Design has the primary responsibility for the continuing airworthiness of an aircraft type. Similarly, the State of Registry, in this case CASA, must develop or adopt requirements to ensure the continuing airworthiness of aircraft registered within Australia. Parties governed by these regulations must adhere to the ADs issued by CASA. This includes ensuring that all aircraft within the scope of the ADs comply with the specified requirements. Failure to comply with an AD can result in serious safety issues, potentially leading to the grounding of affected aircraft until the required actions are taken. This compliance is critical, as non-compliance can lead to significant civil or criminal consequences. There are specific consequences for breaches of these regulations. Section 23 of the Civil Aviation Act 1988 outlines that any person who contravenes an AD commits an offence. The maximum penalty for an individual is 50 penalty units, or for a body corporate, 250 penalty units. Additionally, CASA has the authority to take enforcement actions, which can include fines, suspension or revocation of certificates, or other measures deemed necessary to ensure compliance and maintain air safety standards.

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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.