AD/B737/309 - Flightcrew Seat Locks and Seat Tracks - 2

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Legislation au F2007L04008 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 US FAA has issued AD 2007-18-03 affecting Boeing B737 model aircraft.  The USA is the State of Design for this type.  CASA has assessed this AD and has issued Australian AD/B737/309, which will become effective on 25 October 2007. 

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, enacted by the Commonwealth Parliament, serves to establish the regulatory framework for civil aviation in Australia, with a primary focus on ensuring the safety of air navigation. This Act empowers the Governor-General to make regulations that contribute to the overarching objective of air navigation safety. One such regulation, regulation 39.001 of the Civil Aviation Safety Regulations 1998, allows the Civil Aviation Safety Authority (CASA) to issue airworthiness directives (ADs) concerning specific types of aircraft or aeronautical products. This mechanism enables CASA to mandate safety requirements and maintain the continuing airworthiness of aircraft registered in Australia, in alignment with international obligations under the Convention on International Civil Aviation. The ADs are a critical component of ensuring that Australian aviation practices meet both national and international safety standards.

Scope and Application

The Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998 govern the issuance of airworthiness directives (ADs) by the Civil Aviation Safety Authority (CASA) to ensure the safety of air navigation. Specifically, regulation 39.001 of the Civil Aviation Safety Regulations 1998 empowers CASA to issue ADs for kinds of aircraft or aeronautical products, which are considered disallowable instruments under the Acts Interpretation Act 1901. These ADs apply to aircraft and aeronautical products registered in Australia, ensuring that they comply with safety standards set by the State of Design, which is the country where the aircraft was designed. The State of Registry, which is the country where the aircraft is registered, is responsible for ensuring the continuing airworthiness of the aircraft. The application of these regulations extends nationally, and CASA's authority to issue ADs is exercised in accordance with Australia's obligations under the Convention on International Civil Aviation. ADs do not require public consultation or a Regulatory Impact Statement, as they are issued in response to directives from the relevant State of Design.

Key Provisions

The Civil Aviation Act 1988, in conjunction with the Civil Aviation Safety Regulations 1998, provides the framework for the issuance of airworthiness directives (ADs) by the Civil Aviation Safety Authority (CASA). Specifically, section 98 of the Act allows the Governor-General to make regulations for the safety of air navigation, and regulation 39.001 under the 1998 Regulations empowers CASA to issue ADs for certain types of aircraft or aeronautical products. This legislative authority is underpinned by the requirement of the State of Design to provide necessary information to ensure the continuing airworthiness of aircraft types, as stipulated in Annex 8 to the Convention on International Civil Aviation. The ADs serve as a common form of continuing airworthiness information shared among ICAO Contracting States. Under the Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998, CASA has specific obligations when it comes to issuing and enforcing ADs. The authority must assess any ADs issued by the State of Design, which in this case is the United States for the Boeing B737 model aircraft. If deemed appropriate, CASA must issue corresponding Australian ADs to mandate the requirements of the State of Design. This process ensures that Australian aircraft comply with international safety standards. Additionally, CASA, as Australia’s national airworthiness authority, must ensure that the continuing airworthiness of aircraft registered in Australia is maintained by developing or adopting appropriate requirements. Failure to comply with the ADs can result in severe consequences. While the specific regulatory framework does not detail offences and penalties within the provided text, it is reasonable to infer that non-compliance with ADs could lead to enforcement actions under the Civil Aviation Act 1988. These actions may include administrative penalties, fines, or other civil and criminal consequences, as typically prescribed by the Act for non-compliance with airworthiness requirements. Given the critical nature of air safety, the enforcement of ADs is likely stringent to ensure that all aircraft meet the required safety standards.

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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.