AD/B737/312 - Aft Pressure Bulkhead Inspection

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Legislation au F2007L04736 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 US FAA has issued AD 2007-25-03 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/B737/312, which will become effective on 14 January 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 by the Australian Parliament to provide a comprehensive framework for the regulation of civil aviation safety in Australia. The Act aims to ensure the safety of air navigation, among other objectives, and empowers the Governor-General to make regulations to achieve these aims. The Civil Aviation Safety Regulations 1998, made under this Act, empower the Civil Aviation Safety Authority (CASA) to issue airworthiness directives (ADs) for kinds of aircraft or aeronautical products, as per regulation 39.001. These ADs are legislative instruments subject to disallowance and oversight, as per the Acts Interpretation Act 1901 and the Legislative Instruments Act 2003 respectively. The ADs are issued in accordance with international obligations under the Convention on International Civil Aviation, ensuring alignment with global safety standards and practices. The Civil Aviation Safety Authority, as Australia's national airworthiness authority, is responsible for assessing and issuing Australian ADs when necessary, in response to directives from the State of Design or as required by international agreements.

Scope and Application

The Civil Aviation Safety Regulations 1998, under the authority granted by section 98 of the Civil Aviation Act 1988, empower the Civil Aviation Safety Authority (CASA) to issue airworthiness directives (ADs) for specific types of aircraft or aeronautical products. These directives are legislative instruments and are subject to disallowance under section 46A of the Acts Interpretation Act 1901. ADs serve as a key mechanism for maintaining the continuing airworthiness of aircraft, aligning with international obligations under Annex 8 to the Convention on International Civil Aviation. In the context of the Australian Register, CASA, as the national airworthiness authority, must evaluate information from the State of Design, which in this case is the United States for Boeing B737 model aircraft, and issue corresponding Australian ADs if necessary. The issuance of such directives is an integral part of Australia’s commitment to international civil aviation standards, and they are typically not subject to public consultation or a Regulatory Impact Statement, as determined by the Office of Best Practice Regulation.

Key Provisions

The Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998 establish a regulatory framework for ensuring the safety of civil aviation in Australia. Specifically, section 98 of the Act grants the Governor-General the power to make regulations for the purposes of the Act, which includes ensuring the safety of air navigation. Regulation 39.001 of the Civil Aviation Safety Regulations 1998 empowers the Civil Aviation Safety Authority (CASA) to issue airworthiness directives (ADs) for specified kinds of aircraft or aeronautical products. These directives are intended to address safety concerns and ensure the continuing airworthiness of aircraft. According to subregulation 39.001(5), ADs are considered disallowable instruments under the Acts Interpretation Act 1901, and they are also legislative instruments as per the Legislative Instruments Act 2003. Under these legislative provisions, CASA, as Australia's national airworthiness authority, has a responsibility to ensure the continuing airworthiness of aircraft registered in Australia. When a State of Design, such as the United States in the case of Boeing B737 model aircraft, issues an AD, CASA must assess the information provided and, if necessary, issue a corresponding Australian AD to enforce the requirements of the State of Design. This process is mandated by Annex 8 to the Convention on International Civil Aviation, which assigns the State of Design overall responsibility for the continuing airworthiness of an aircraft type, and requires it to provide necessary information to the States of Registry. The obligations imposed by the Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998 on CASA and other parties include assessing and issuing ADs in response to those issued by the State of Design, ensuring compliance by aircraft operators, and maintaining records of any actions taken. The State of Registry, in this case Australia, must also develop or adopt requirements to ensure the continuing airworthiness of aircraft. These obligations are critical in maintaining the safety standards required under international aviation agreements and ensuring that aircraft continue to meet safety requirements throughout their operational life. Failure to comply with ADs may result in serious safety risks and could lead to enforcement actions against the aircraft operator or manufacturer. Under the Civil Aviation Act 1988, non-compliance with ADs can be considered an offence, potentially leading to civil or criminal penalties. For instance, section 38 of the Act provides for civil penalties, including fines, for breaches of ADs, while section 42 provides for criminal penalties, including imprisonment, for more severe violations. The exact penalties depend on the nature and severity of the breach but can include significant financial penalties and imprisonment terms.

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Aviation Law
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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.