AD/BELL 427/7 - Tail Rotor Blades

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Legislation au F2007L04508 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.

Transport Canada has issued AD CF-2007-21 affecting Bell 427 model helicopters.  Canada is the State of Design for this type.  CASA has assessed this AD and has issued Australian AD/BELL 427/7, which will become effective on 20 December 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 was enacted to provide for the regulation of civil aviation in Australia and to ensure the safety and efficiency of air navigation within the country. One of the key mechanisms through which this is achieved is the issuance of airworthiness directives (ADs), which are regulations made under the authority of the Act to ensure the continuing airworthiness of aircraft. The Civil Aviation Safety Regulations 1998 further detail the process for issuing ADs, including their status as legislative instruments that can be disallowed under the Acts Interpretation Act 1901. The Civil Aviation Act 1988 empowers the Governor-General to make such regulations in the interests of air navigation safety, and the Act aligns with international standards set by the Convention on International Civil Aviation, particularly through the roles assigned to the States of Design and Registry. The Civil Aviation Safety Regulations 1998 facilitate the implementation of these international standards by allowing the Civil Aviation Safety Authority (CASA) to issue ADs, ensuring that Australian aircraft meet continuing airworthiness requirements as mandated by international obligations.

Scope and Application

The Civil Aviation Safety Regulations 1998, specifically under regulation 39.001, empower the Civil Aviation Safety Authority (CASA) to issue airworthiness directives (ADs) for specific kinds of aircraft or aeronautical products. These directives are made in accordance with section 98 of the Civil Aviation Act 1988, which authorises the Governor-General to create regulations for the safety of air navigation. Each AD is a legislative instrument and, as such, can be disallowed under section 46A of the Acts Interpretation Act 1901. The geographic reach of these regulations is national, affecting all aircraft and aeronautical products registered in Australia. The ADs serve to ensure the continuing airworthiness of aircraft types, aligning with Australia's obligations under the Convention on International Civil Aviation, particularly Annex 8, which stipulates the State of Design's responsibility for an aircraft type's continuing airworthiness. When a State of Design, such as Canada for the Bell 427 model helicopters, issues an AD, CASA must evaluate and, if necessary, issue a corresponding Australian AD to mandate the same safety requirements. This process is integral to maintaining consistent safety standards across the aviation industry and involves no public consultation as it responds to international obligations and directives from the State of Design.

Key Provisions

The Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998 lay down a framework for ensuring the safety and airworthiness of aircraft in Australia. Section 98 of the Act (1) empowers the Governor-General to create regulations for the safety of air navigation. Regulation 39.001 of the 1998 Regulations (2) allows the Civil Aviation Safety Authority (CASA) to issue airworthiness directives (ADs) for specific types of aircraft or aeronautical products. These directives, as per subregulation 39.001(5) (3), are considered disallowable instruments under section 46A of the Acts Interpretation Act 1901 and are legislative instruments under section 6 of the Legislative Instruments Act 2003. The obligations imposed by these provisions are significant. The State of Design, responsible for an aircraft type, must provide necessary information to ensure the continuing airworthiness of the aircraft type to States of Registry, including Australia. Annex 8 to the Convention on International Civil Aviation mandates this responsibility. The State of Registry, in this case Australia, must adopt or develop requirements to maintain the continuing airworthiness of the aircraft. When an AD is issued by the State of Design, CASA must assess the information and, if necessary, issue an Australian AD to mandate these requirements. Failure to comply with the provisions of these regulations can lead to serious consequences. While specific offences and penalties are not detailed in the provided text, it is clear that non-compliance with ADs could result in civil or criminal liability. The safety and compliance with airworthiness directives are paramount, and breaches could lead to significant penalties, including fines and imprisonment, depending on the severity and impact of the non-compliance. In summary, the Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998 provide a structured approach to ensuring the airworthiness of aircraft in Australia. They mandate that CASA, as the national airworthiness authority, must act on directives issued by the State of Design and ensure that Australian aircraft meet international safety standards. Non-compliance with these regulations can have serious legal ramifications, underscoring the importance of adhering to the provisions set forth.

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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.