AD/J4100/4 - Landing Gear Drag Brace Spherical Bearing

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Legislation au F2008L00493 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 UK CAA has issued AD 003-07-97 affecting British Aerospace Jetstream 4100 series aeroplanes.  The United Kingdom is the State of Design for this type.  CASA has assessed this AD and has issued Australian AD/J4100/4, 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, Systems and New Technologies 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 establish and maintain a regulatory framework for civil aviation in Australia, ensuring safety and efficiency in air navigation. The Act empowers the Governor-General to create regulations that serve the interests of air navigation safety, with the Civil Aviation Safety Regulations 1998 providing specific mechanisms for such regulation. One such regulatory tool is the issuance of airworthiness directives (ADs), which are critical in maintaining the continuing airworthiness of aircraft types. The Civil Aviation Safety Regulations 1998 allow the Civil Aviation Safety Authority (CASA) to issue ADs for specific kinds of aircraft or aeronautical products. As ADs are considered legislative instruments, they must comply with the Legislative Instruments Act 2003. These directives are mandated by international obligations under Annex 8 to the Convention on International Civil Aviation, which assigns the State of Design the responsibility for the continuing airworthiness of aircraft types and requires them to provide necessary information to States of Registry. Consequently, CASA, acting as Australia's national airworthiness authority, assesses and, when necessary, issues Australian ADs to comply with directives from the relevant State of Design, ensuring adherence to international standards.

Scope and Application

The Civil Aviation Safety Regulations 1998, under regulation 39.001, empower the Civil Aviation Safety Authority (CASA) to issue airworthiness directives (ADs) concerning specific types of aircraft or aeronautical products, with these directives being legislative instruments as per the Legislative Instruments Act 2003. These directives are fundamental for ensuring the continuing airworthiness of aircraft and are issued in line with international standards set forth in Annex 8 to the Convention on International Civil Aviation. The State of Design, responsible for the initial airworthiness of an aircraft type, must share necessary information with the States of Registry, which in Australia is CASA. When an AD is issued by the State of Design, CASA is required to evaluate and, if necessary, issue an Australian AD to enforce the State of Design's requirements. For instance, in response to the UK Civil Aviation Authority's AD 003-07-97 for British Aerospace Jetstream 4100 series aeroplanes, CASA issued Australian AD/J4100/4. Given that these directives are a response to international obligations and are not subject to public consultation, they do not require a Regulatory Impact Statement. The ADs are issued by the Manager, Systems and New Technologies in the Airworthiness Engineering Branch on behalf of CASA, under the authority provided by the Civil Aviation Act 1988.

Key Provisions

The Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998 provide the legislative framework under which airworthiness directives (ADs) can be issued and enforced in Australia. Under section 98 of the Act, the Governor-General has the authority to make regulations necessary for the safety of air navigation. Regulation 39.001 of the Civil Aviation Safety Regulations 1998 specifically allows the Civil Aviation Safety Authority (CASA) to issue ADs for kinds of aircraft or aeronautical products. These ADs are considered legislative instruments under subregulation 39.001(5) and the Acts Interpretation Act 1901. These ADs serve as a critical mechanism for maintaining the continuing airworthiness of aircraft. According to Annex 8 to the Convention on International Civil Aviation, the State of Design is responsible for ensuring the airworthiness of an aircraft type and must provide necessary information to States of Registry. In Australia, CASA, as the national airworthiness authority, has the duty to assess any ADs issued by States of Design and, if deemed appropriate, issue corresponding Australian ADs to enforce the required measures. This is particularly pertinent when an AD is issued by the UK Civil Aviation Authority (CAA) for British Aerospace Jetstream 4100 series aeroplanes, where the UK is the State of Design and CASA has issued Australian AD/J4100/4, effective from 20 February 2008. The issuance of these ADs is governed by specific obligations and requirements. CASA must assess any ADs from States of Design and determine their applicability to aircraft registered in Australia. If an AD is deemed necessary, CASA must issue an Australian AD to mandate compliance. Furthermore, these ADs are issued without public consultation because they are based on international obligations and responses to ADs from the relevant State of Design. The Office of Best Practice Regulation has also determined that ADs do not require a Regulatory Impact Statement. The Manager, Systems and New Technologies in the Airworthiness Engineering Branch has the authority to make these ADs on behalf of CASA, in accordance with subsection 84A(2) of the Act. Failure to comply with an AD can lead to significant legal consequences. While the specific offences and penalties for non-compliance with ADs are not detailed in the provided text, it is clear that non-compliance with ADs can result in serious repercussions under civil and potentially criminal law. The exact penalties may vary depending on the severity of the non-compliance and the specific regulations governing the aircraft in question. However, it is evident that adherence to these ADs is crucial for maintaining the safety and airworthiness of aircraft operating within Australia.

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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.