AD/THIELERT/4 - Introduction of Chapter 5 to TAE125-01 Operation and Maintenance Manual

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Legislation au F2005L01017 In force Legislative Instrument

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CIVIL AVIATION ACT 1988

CIVIL AVIATION 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 German LBA has issued AD D-2005-152 affecting Thielert TAE125 aircraft engines.  Germany is the State of Design for Thielert TAE125 aircraft engines.  CASA has assessed this AD and has issued Australian AD/THIELERT/4, which will become effective on 04 May 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 Section Head - Systems, Airworthiness Standards Branch, Standards Division, on behalf of CASA, in accordance with subsection 84A (2) of the Act.

Overview

The Civil Aviation Act 1988 was enacted to establish a framework for civil aviation safety and efficiency in Australia. This Act provides the legislative basis for the regulation of civil aviation and the safety of air navigation within Australian airspace. It was introduced to address the need for a comprehensive legal framework that ensures the safety, efficiency, and orderly development of civil aviation in Australia, aligning with international standards and practices. The Act empowers the Governor-General to make regulations for the purposes of the Act, which are instrumental in maintaining the safety of air navigation. Pursuant to the Act, the Civil Aviation Safety Authority (CASA) has the authority to issue airworthiness directives to ensure the continuing airworthiness of aircraft and aeronautical products. This legislative measure was enacted by the Parliament of Australia, reflecting a policy objective to uphold high safety standards in civil aviation, in line with international conventions such as the Convention on International Civil Aviation.

Scope and Application

The Civil Aviation Act 1988, together with the Civil Aviation Safety Regulations 1998, establishes a framework for ensuring the safety of air navigation, with a particular focus on airworthiness. This legislation applies to all aircraft registered in Australia and extends to any aeronautical products and components used in such aircraft. The Act empowers the Civil Aviation Safety Authority (CASA) to issue airworthiness directives (ADs) as necessary to maintain safety standards. These ADs are issued in response to international standards, such as those set forth in Annex 8 to the Convention on International Civil Aviation, which places the responsibility for the continuing airworthiness of an aircraft type on the State of Design. Consequently, CASA must assess and, if appropriate, issue corresponding Australian ADs when the State of Design issues an AD affecting aircraft registered in Australia. The issuance of ADs is a legislative instrument under the Legislative Instruments Act 2003 and is executed by CASA without the need for public consultation or a Regulatory Impact Statement, due to the international obligations and safety imperatives involved.

Key Provisions

The Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998 provide the legal framework for the issuance of airworthiness directives (ADs). Section 98 of the Civil Aviation Act 1988 allows the Governor-General to make regulations for air safety, while regulation 39.001 of the Civil Aviation Safety Regulations 1998 empowers the Civil Aviation Safety Authority (CASA) to issue ADs for specific aircraft types or aeronautical products. Under subregulation 39.001(5), these ADs are considered disallowable instruments as per section 46A of the Acts Interpretation Act 1901 and are regarded as legislative instruments under section 6 of the Legislative Instruments Act 2003. The obligations under these regulations are substantial. The State of Design has the primary responsibility for the continuing airworthiness of an aircraft type, as outlined in Annex 8 to the Convention on International Civil Aviation, and must provide necessary information to the appropriate States of Registry. The State of Registry, in turn, is responsible for ensuring the continuing airworthiness of the aircraft. When a State of Design issues an AD, such as the German LBA’s AD D-2005-152 affecting Thielert TAE125 aircraft engines, CASA must assess the information and, if necessary, issue an Australian AD to mandate the requirements. Failure to comply with ADs can lead to serious consequences. While the specific offences, penalties, or consequences for breaching ADs are not detailed in the provided text, it is implicit that non-compliance with airworthiness directives could result in safety violations, potential accidents, and subsequent legal repercussions. The regulatory framework ensures that ADs are issued and followed to maintain the highest safety standards in aviation, underscoring the importance of adhering to these directives. In conclusion, the Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998 facilitate the issuance of ADs by CASA, ensuring compliance with international standards for airworthiness. These directives, issued in response to obligations under the Convention on International Civil Aviation, impose critical obligations on States of Design and Registry to maintain aircraft safety. Non-compliance with these ADs could lead to severe legal and safety implications, underscoring the necessity for adherence 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.