AD/BO 105/19 - Tail Rotor Blade Grips

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Legislation au F2007L02678 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 German LBA has issued AD 78-399 affecting Messerschmitt-Bolkow Blohm BO-105 model helicopters.  Germany is the State of Design for this type.  CASA has assessed this AD and has issued Australian AD/BO 105/19, which will become effective on 27 September 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 a comprehensive framework for the regulation of civil aviation in Australia, ensuring safety and efficiency in the sector. The Act grants the Governor-General the authority to create regulations that serve the interests of air navigation safety, a principle which is exercised through the issuance of airworthiness directives (ADs) by the Civil Aviation Safety Authority (CASA) under regulation 39.001 of the Civil Aviation Safety Regulations 1998. These directives are legislative instruments that align with international standards set forth by the International Civil Aviation Organization (ICAO), particularly under Annex 8. The Civil Aviation Act 1988 ensures that Australia adheres to its international obligations by mandating CASA to issue ADs when required by the State of Design, thereby maintaining the continuing airworthiness of aircraft registered in Australia. This process ensures that Australian aircraft meet the necessary safety standards set by ICAO and the relevant States of Design.

Scope and Application

The Civil Aviation Safety Regulations 1998, as part of the Civil Aviation Act 1988, empower the Civil Aviation Safety Authority (CASA) to issue airworthiness directives (ADs) to ensure the safety of air navigation. These directives apply to specific types of aircraft or aeronautical products and are legislative instruments, subject to disallowance under the Acts Interpretation Act 1901. Under the Convention on International Civil Aviation, the State of Design bears responsibility for the continuing airworthiness of aircraft types and must share necessary information with States of Registry, which must then ensure the aircraft's ongoing airworthiness. In Australia, CASA, as the national airworthiness authority, must assess information from State of Design ADs and issue corresponding Australian ADs if necessary. For instance, following Germany’s issuance of AD 78-399 for the Messerschmitt-Bolkow Blohm BO-105 model helicopters, CASA issued Australian AD/BO 105/19, effective from 27 September 2007. This process does not require public consultation or a Regulatory Impact Statement, as it arises from international obligations and is in response to directives from the relevant State of Design.

Key Provisions

The Civil Aviation Act 1988 (sections 98 and 84A) allows the Governor-General to make regulations for the safety of air navigation, and empowers the Civil Aviation Safety Authority (CASA) to issue airworthiness directives (ADs) under regulation 39.001 of the Civil Aviation Safety Regulations 1998. These directives are considered legislative instruments as per section 46A of the Acts Interpretation Act 1901 and section 6 of the Legislative Instruments Act 2003. Such ADs are crucial for maintaining the continuing airworthiness of aircraft types, as outlined in Annex 8 to the Convention on International Civil Aviation, where the State of Design is responsible for providing necessary information. The State of Registry must then ensure that the aircraft remains airworthy according to the requirements set out in the ADs. In the context of the Messerschmitt-Bolkow Blohm BO-105 model helicopters, Germany, as the State of Design, issued AD 78-399. CASA, as Australia's national airworthiness authority, assessed this directive and subsequently issued Australian AD/BO 105/19, effective from 27 September 2007. Given the international nature of this requirement and the direct response to an AD by the State of Design, no public consultation was necessary, and the Office of Best Practice Regulation deemed a Regulatory Impact Statement unnecessary. The Manager, Airframes in the Airworthiness Engineering Branch, made this AD on behalf of CASA in accordance with the Act. The obligations imposed by these regulations on the parties involved are significant. The State of Design, such as Germany in this case, must ensure the continuing airworthiness of the aircraft type by issuing relevant directives. CASA, as the State of Registry, must assess and implement these directives to maintain airworthiness standards for aircraft registered in Australia. This process ensures that all stakeholders adhere to international safety standards and protocols. Any failure to comply with the provisions of the ADs can result in serious consequences. For example, operators of affected aircraft must implement the mandated changes or face potential grounding of their aircraft. Non-compliance with ADs can lead to enforcement actions by CASA, including fines, suspension, or revocation of airworthiness certificates. Such regulatory breaches may also attract civil and criminal penalties, depending on the severity and intent behind the non-compliance. The maximum penalties can include substantial fines and, in some cases, imprisonment for individuals found guilty of serious violations.

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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.