AD/CESSNA 500/7 - Landing Gear Unlock Actuator and Control System - CANCELLED

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Legislation au F2008L03377 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. 

The Civil Aviation Safety Authority or its predecessors issued AD/CESSNA 500/7 affecting all Cessna 500 model aeroplanes.  CASA has assessed this AD and as a result has cancelled Australian AD/CESSNA 500/7.  The cancellation will become effective on 25 September 2008.  No replacement AD is required, as the unsafe condition no longer exists.

As this AD has been cancelled because of Australia’s obligations under the Convention on International Civil Aviation, no consultation with the Australian public has taken place on this AD cancellation.  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 Group, on behalf of CASA, in accordance with subsection 84A (2) of the Act.

 

Overview

The Civil Aviation Act 1988, enacted by the Australian Parliament, was introduced to ensure the safety and efficiency of civil aviation within Australia. One of its key provisions allows the Governor-General to make regulations in the interest of air navigation safety. This legislative framework is further detailed in the Civil Aviation Safety Regulations 1998, which empower the Civil Aviation Safety Authority (CASA) to issue airworthiness directives (ADs) for specific types of aircraft or aeronautical products. These ADs serve as a critical mechanism for maintaining the continuing airworthiness of aircraft, aligning with international standards as outlined in Annex 8 to the Convention on International Civil Aviation. The problem or gap this legislation addresses is the need for a structured and legally binding approach to ensuring that aircraft remain airworthy, thereby enhancing public safety and harmonising regulatory practices with international obligations.

Scope and Application

The Civil Aviation Act 1988, as amended by the Civil Aviation Safety Regulations 1998, provides a legislative framework for the regulation of airworthiness directives (ADs) in Australia, with the Civil Aviation Safety Authority (CASA) playing a pivotal role in issuing and managing these directives. Under section 98 of the Civil Aviation Act, the Governor-General has the authority to make regulations in the interests of the safety of air navigation, with regulation 39.001 specifically empowering CASA to issue ADs for kinds of aircraft or aeronautical products. This authority extends to all aircraft registered within Australia, encompassing both commercial and private entities involved in civil aviation activities. The ADs are legislative instruments, subject to disallowance under section 46A of the Acts Interpretation Act 1901, and thus are formal instruments regulated under the Legislative Instruments Act 2003. The application of these directives is informed by international obligations, particularly those outlined in Annex 8 to the Convention on International Civil Aviation, where the State of Design is responsible for the continuing airworthiness of an aircraft type, and the State of Registry must ensure the continuing airworthiness of individual aircraft. The cancellation of AD/CESSNA 500/7, which affected all Cessna 500 model aeroplanes, exemplifies how CASA can revoke an AD if the unsafe condition it was intended to address no longer exists, thus reflecting the dynamic nature of airworthiness management in response to international standards and obligations.

Key Provisions

The Civil Aviation Act 1988, supplemented by the Civil Aviation Safety Regulations 1998, grants the Civil Aviation Safety Authority (CASA) the power to issue airworthiness directives (ADs) under regulation 39.001. These directives, which are legislative instruments as per section 46A of the Acts Interpretation Act 1901 and the Legislative Instruments Act 2003, are essential for ensuring the safety and continuing airworthiness of aircraft. The ADs are aligned with the responsibilities of the State of Design and the State of Registry as outlined in Annex 8 to the Convention on International Civil Aviation. Entities governed by these regulations, such as CASA and the State of Registry, have specific obligations. The State of Design must provide necessary information to maintain airworthiness, while the State of Registry is tasked with developing or adopting requirements to ensure the continuing airworthiness of aircraft within its jurisdiction. CASA, in its role, has the authority to issue and cancel ADs based on safety assessments, as demonstrated by the cancellation of AD/CESSNA 500/7 for Cessna 500 model aeroplanes. For breaches of the provisions outlined in the Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998, various penalties and consequences may apply. Although specific penalties are not detailed in the provided text, general provisions within the Act and Regulations may include fines, imprisonment, or other administrative actions. The precise penalties would depend on the nature and severity of the breach, as well as any applicable laws and regulations. The enforcement of these provisions ensures that all parties maintain high safety standards in civil aviation.

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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.