AD/B747/326 - Flap Control Unit

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Legislation au F2005L00857 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 United States FAA has issued AD 2005-04-03 affecting Boeing 747-400 series aircraft.  The United States is the State of Design for these types.  CASA has assessed this AD and has issued Australian AD/B747/326, which will become effective on 12 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 provide a comprehensive framework for the regulation of civil aviation in Australia, aiming to ensure the safety and efficiency of air navigation and the continuing airworthiness of aircraft. This legislation empowers the Governor-General to make regulations, including the issuing of airworthiness directives, to address issues related to aviation safety. Under the Civil Aviation Regulations 1998, the Civil Aviation Safety Authority (CASA) is authorised to issue such directives, which are legislative instruments subject to disallowance. These directives are crucial for maintaining the airworthiness of aircraft and are typically issued in response to international obligations and directives from the State of Design. The policy objective is to harmonise Australian aviation safety standards with international requirements, ensuring that aircraft registered in Australia meet global safety benchmarks.

Scope and Application

The Civil Aviation Act 1988, supplemented by the Civil Aviation Regulations 1998, empowers the Civil Aviation Safety Authority (CASA) to issue airworthiness directives (ADs) under regulation 39.001. These directives apply to specific kinds of aircraft or aeronautical products to ensure the safety of air navigation. The ADs are legislative instruments that mandate compliance with continuing airworthiness standards, as outlined in Annex 8 to the Convention on International Civil Aviation. The State of Design holds primary responsibility for the continuing airworthiness of an aircraft type and must provide necessary information to the States of Registry, including Australia. CASA, as the national airworthiness authority, assesses this information and issues Australian ADs to enforce the requirements of the State of Design. For instance, CASA issued Australian AD/B747/326 in response to an AD from the United States regarding Boeing 747-400 series aircraft, reflecting Australia's international obligations and the need for uniform airworthiness standards. The process of issuing these directives does not require public consultation or a Regulatory Impact Statement, as they are issued under specific regulatory frameworks and in alignment with international conventions.

Key Provisions

The Civil Aviation Act 1988, in particular section 98, empowers the Governor-General to create regulations that are aimed at ensuring the safety of air navigation. Regulation 39.001 of the Civil Aviation Safety Regulations 1998 further stipulates that the Civil Aviation Safety Authority (CASA) is authorised to issue airworthiness directives (ADs) for specific types of aircraft or aeronautical products. It is important to note that these ADs are considered legislative instruments under section 6 of the Legislative Instruments Act 2003 and are subject to disallowance as per section 46A of the Acts Interpretation Act 1901. The ADs play a crucial role in maintaining the continuing airworthiness of aircraft types as mandated by Annex 8 to the Convention on International Civil Aviation. The obligations imposed by the Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998 on parties such as CASA, the State of Design, and the State of Registry are significant. The State of Design holds the primary responsibility for the continuing airworthiness of an aircraft type and must provide necessary information to the State of Registry to ensure that the aircraft remains airworthy. CASA, as Australia's national airworthiness authority, must assess any information from the State of Design and, if necessary, issue an Australian AD to enforce the requirements specified by the State of Design. The State of Registry, on the other hand, is tasked with developing or adopting requirements to ensure that individual aircraft remain airworthy. Breaching the requirements set out in the airworthiness directives can lead to serious consequences. While specific offences and penalties are not detailed in the provided text, it is clear that failure to comply with ADs could result in aircraft being deemed unairworthy, potentially leading to civil or criminal liability for operators who do not adhere to the mandated safety standards. The implications of non-compliance can include aircraft grounding, legal actions, and penalties that could vary depending on the severity and impact of the breach. In summary, the Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998 establish a framework for maintaining the airworthiness of aircraft through the issuance and enforcement of airworthiness directives. These directives are integral to the responsibilities of the State of Design and the State of Registry, with CASA playing a critical role in ensuring compliance within Australia. The legislative instruments are designed to uphold the highest safety standards in air navigation, with potential civil or criminal consequences for any breaches of the 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.