AD/THIELERT/1 Amdt 2 - Engine Failure Due to Electrical System Failure

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Legislation au F2005L00819 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.  An AD is a disallowable instrument under section 46A of the Acts Interpretation Act 1901.

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 Design.

The German LBA has issued AD D-2004-457 R2 affecting Thielert Aircraft Engines GmbH Model TAE125-01 engines.  Germany is the State of Design for this type.  CASA has assessed this AD and has issued Australian AD/THIELERT/1, Amendment 2, which will become effective on 6 April 2005.  This AD cancels and replaces the previous issue.

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 provide a legal framework for the regulation of civil aviation in Australia, ensuring safety and efficiency in air navigation. The Act empowers the Governor-General to make regulations necessary for the safety of air navigation, such as the Civil Aviation Safety Regulations 1998, which include provisions for issuing airworthiness directives (ADs) to maintain the continuing airworthiness of aircraft. These ADs are crucial for adhering to international standards set by the International Civil Aviation Organization (ICAO), particularly under Annex 8, which assigns responsibility for airworthiness to the State of Design and State of Registry. The Civil Aviation (Airworthiness) Regulations 1998 specifically allow the Civil Aviation Safety Authority (CASA) to issue ADs, ensuring alignment with international obligations and safety standards. The ADs issued by CASA, such as the Australian AD/THIELERT/1, Amendment 2, reflect Australia's commitment to international civil aviation agreements and aim to maintain the highest safety standards in Australian airspace.

Scope and Application

The Civil Aviation Act 1988 and associated Civil Aviation Regulations 1998 provide the framework for ensuring the safety and continuing airworthiness of aircraft operating in Australia. Regulation 39.001 specifically empowers the Civil Aviation Safety Authority (CASA) to issue airworthiness directives (ADs) for particular kinds of aircraft or aeronautical products. ADs are essential tools for maintaining the airworthiness of aircraft by mandating specific safety measures or corrective actions in response to identified safety issues. These directives are issued by national aviation authorities, such as CASA in Australia, in accordance with international standards set by the International Civil Aviation Organization (ICAO). The State of Design, which is responsible for the design of the aircraft type, plays a critical role in issuing ADs, and the State of Registry, where the aircraft is registered, must ensure compliance with these directives. This legislative framework applies to all aircraft types registered in Australia, and to manufacturers, operators, and other entities involved in the aircraft industry. The geographic scope of the legislation extends nationally, aligning with Australia's obligations under international conventions and ensuring a cohesive approach to aviation safety across the country. The Act and its subordinate regulations do not require public consultation for ADs issued in response to international directives, as they are based on pre-established international standards and obligations.

Key Provisions

The Civil Aviation Act 1988, in particular section 98, provides the authority for the Governor-General to make regulations to ensure the safety of air navigation. Section 39.001 of the Civil Aviation Safety Regulations 1998 further specifies that the Civil Aviation Safety Authority (CASA) can issue airworthiness directives (ADs) for specific types of aircraft or aeronautical products. These ADs are subject to disallowance under section 46A of the Acts Interpretation Act 1901. Airworthiness directives serve as a primary means of ensuring the ongoing airworthiness of aircraft types, as stipulated under Annex 8 to the Convention on International Civil Aviation. Under the Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998, the State of Design holds primary responsibility for the continuing airworthiness of an aircraft type, while the State of Registry is responsible for the airworthiness of individual aircraft. This division of responsibility is intended to ensure that all states cooperate in maintaining high safety standards. In Australia, CASA, as the national airworthiness authority, must assess airworthiness directives issued by the State of Design and determine their applicability to aircraft registered in Australia. For instance, when Germany, the State of Design for Thielert Aircraft Engines GmbH Model TAE125-01 engines, issued AD D-2004-457 R2, CASA assessed this directive and subsequently issued Australian AD/THIELERT/1, Amendment 2. The obligations of the parties governed by this legislation include the timely assessment and implementation of airworthiness directives by the relevant national authority, such as CASA in Australia. For example, CASA must evaluate any airworthiness directive issued by the State of Design, such as the German LBA’s AD D-2004-457 R2, and determine if it applies to aircraft registered in Australia. If it does, CASA must then issue its own directive, as seen in the case of AD/THIELERT/1, Amendment 2. Additionally, aircraft operators and owners must comply with these directives by following the specified maintenance and operational requirements to ensure the continuing airworthiness of their aircraft. In the event of non-compliance with airworthiness directives, there can be significant civil and criminal consequences. While the specific penalties are not detailed in the provided text, non-compliance can generally result in enforcement actions by CASA, including fines, suspension or revocation of airworthiness certificates, and potential criminal charges. The severity of these consequences underscores the importance of adhering to airworthiness directives to maintain the safety of air navigation.

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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.