AD/J4100/5 - Airworthiness Limitations

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Legislation au F2008L00494 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 European Aviation Safety Authority (EASA) has issued AD 2006-0088 affecting BAe Jetstream 4100 model aircraft.  EASA acts on behalf of the United Kingdom, the State of Design for this type.  CASA has assessed this AD and has issued Australian AD/J4100/5, which will become effective on 20 February 2008. 

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 Best Practice Regulation has determined that ADs do not require a Regulatory Impact Statement.

The AD has been made by the Manager, Airframes in the Airworthiness Engineering Branch, on behalf of CASA, in accordance with subsection 84A (2) of the Act.

Overview

The Civil Aviation Act 1988 was enacted to provide a regulatory framework ensuring the safety, efficiency, and orderly development of civil aviation in Australia. It empowers the Governor-General to make regulations that are essential for the safety of air navigation, including the issuance of airworthiness directives. The Civil Aviation Safety Regulations 1998, made under the Act, further detail the procedures for issuing such directives. The Australian Transport Safety Bureau (ATSB), as the national airworthiness authority, is mandated to assess and issue these directives to ensure the continuing airworthiness of aircraft registered in Australia. This legislative framework is critical for maintaining safety standards in line with international conventions, such as Annex 8 to the Convention on International Civil Aviation, which delineates the responsibilities of States of Design and Registry regarding aircraft airworthiness. The process of issuing airworthiness directives, such as AD/J4100/5 in response to EASA’s AD 2006-0088 for BAe Jetstream 4100 model aircraft, exemplifies how Australia implements its international obligations and ensures the safety of its aviation fleet.

Scope and Application

The Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998 govern the issuance of airworthiness directives (ADs) in Australia, ensuring compliance with international civil aviation standards and the continuing airworthiness of aircraft. Under these regulations, the Civil Aviation Safety Authority (CASA) is empowered to issue ADs for specific types of aircraft or aeronautical products, thereby enforcing safety standards set by the State of Design, which has the primary responsibility for the airworthiness of an aircraft type. The ADs are designed to maintain the safety and airworthiness of aircraft operating within Australia and are considered legislative instruments under the Acts Interpretation Act 1901 and the Legislative Instruments Act 2003. The State of Registry, in this case, CASA, is responsible for ensuring that the ADs issued by the State of Design are implemented in Australia. For instance, when the European Aviation Safety Agency (EASA) issued an AD for the BAe Jetstream 4100 model aircraft, CASA assessed this directive and subsequently issued its own AD to mandate the requirements for aircraft registered in Australia. This process ensures that all aircraft operating in Australia meet the necessary safety standards as dictated by international agreements and national regulations.

Key Provisions

The key operative sections of this piece of legislation revolve around the authority to issue airworthiness directives (ADs) under the Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998. Section 98 of the Civil Aviation Act 1988 empowers the Governor-General to make regulations necessary for air navigation safety. Regulation 39.001 of the Civil Aviation Safety Regulations 1998 allows the Civil Aviation Safety Authority (CASA) to issue ADs for certain types of aircraft or aeronautical products. These ADs are considered legislative instruments under section 6 of the Legislative Instruments Act 2003. Subregulation 39.001(5) specifies that ADs are disallowable instruments, which means they can be annulled by either House of Parliament. Under this legislation, CASA, as Australia's national airworthiness authority, has specific obligations. When the State of Design, in this case, the United Kingdom for the BAe Jetstream 4100 model aircraft, issues an AD, CASA must assess the information and, if appropriate, issue a corresponding Australian AD. This ensures that the requirements for continuing airworthiness are met in accordance with international obligations under the Convention on International Civil Aviation. The State of Registry, which in this context is Australia, is responsible for ensuring the continuing airworthiness of the aircraft on the Australian Register. CASA’s role is to interpret and implement the directives issued by the State of Design. The legislation outlines the consequences of non-compliance with airworthiness directives. While the specific offences, penalties, or civil/criminal consequences are not detailed in the provided text, it is clear that failure to comply with ADs can result in significant ramifications. These could include regulatory action against aircraft operators or manufacturers, potentially leading to fines, suspension of airworthiness certificates, or other enforcement actions. The seriousness of these consequences underscores the importance of adhering to the directives issued by CASA, as they are designed to maintain the highest standards of aviation safety. Given the international nature of aviation, compliance with ADs is not just a domestic requirement but a global one. The AD issued by CASA in response to EASA’s AD 2006-0088 demonstrates the interconnected regulatory framework governing airworthiness. The process is streamlined to ensure swift action, reflecting the urgency and critical nature of aviation safety measures. Although consultation with the Australian public was not required for this specific AD due to its international obligations, the overarching goal remains the safety and reliability of aircraft operating in Australian airspace.

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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.