AD/PDH/2 - Model 3/1000/2 - Propeller Retaining Nut - Inspection - CANCELLED

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Legislation au F2009L00947 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 Civil Aviation Safety Authority or its predecessors issued AD/PDH/2 affecting De Havilland Propeller model 3HFB (3/1000/2).  CASA has assessed this AD and as a result has cancelled Australian AD/PDH/2.  The cancellation will become effective on 9 April 2009.  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 was enacted to establish a framework for civil aviation safety in Australia, with the overarching aim of ensuring the safety of air navigation. The Act empowers the Governor-General to make regulations, including the issuance of airworthiness directives, to achieve this objective. In this context, the Civil Aviation Safety Regulations 1998 were established to provide further detail and mechanisms for the implementation of these safety measures. Specifically, regulation 39.001 of these Regulations allows the Civil Aviation Safety Authority (CASA) to issue airworthiness directives for specific types of aircraft or aeronautical products. This legislation is essential to maintain the safety standards mandated by international agreements, such as Annex 8 to the Convention on International Civil Aviation, which places the responsibility for continuing airworthiness on the State of Design and requires the State of Registry to ensure the safety of individual aircraft. In this particular instance, CASA has cancelled an existing airworthiness directive concerning the De Havilland Propeller model 3HFB (3/1000/2), effective from 9 April 2009, due to the resolution of the previously identified unsafe condition.

Scope and Application

The Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998 provide the legal framework for issuing airworthiness directives (ADs) in Australia, under which the Civil Aviation Safety Authority (CASA) can mandate safety measures for aircraft and aeronautical products. Regulation 39.001 of the Civil Aviation Safety Regulations 1998 allows CASA to issue ADs for specific types of aircraft or aeronautical products, ensuring compliance with international safety standards. These ADs, which are legislative instruments under the Legislative Instruments Act 2003, are crucial for maintaining the continuing airworthiness of aircraft, a responsibility shared between the State of Design and the State of Registry, as outlined in Annex 8 to the Convention on International Civil Aviation. In the case of the De Havilland Propeller model 3HFB (3/1000/2), CASA issued AD/PDH/2, which has since been cancelled due to the resolution of the unsafe condition, reflecting Australia’s adherence to international obligations and the practical cessation of the need for such safety measures.

Key Provisions

The Civil Aviation Act 1988, particularly section 98, empowers the Governor-General to enact regulations aimed at ensuring the safety of air navigation. Regulation 39.001 of the Civil Aviation Safety Regulations 1998 further specifies that the Civil Aviation Safety Authority (CASA) can issue airworthiness directives (ADs) for certain types of aircraft or aeronautical products. This regulatory framework is designed to maintain the safety standards of air travel and ensure that aircraft remain airworthy throughout their operational life. It is crucial to note that an AD is considered a disallowable instrument under section 46A of the Acts Interpretation Act 1901 and is classified as a legislative instrument as per section 6 of the Legislative Instruments Act 2003. The obligations imposed by these regulations on parties and entities, particularly CASA, include the responsibility to assess and, if necessary, issue airworthiness directives that align with international standards. Specifically, under Annex 8 to the Convention on International Civil Aviation, the State of Design must provide necessary information to ensure the continuing airworthiness of aircraft types. CASA, acting as Australia’s national airworthiness authority, must review this information and, if appropriate, issue an Australian AD to enforce the requirements. Additionally, the State of Registry of an individual aircraft has the obligation to develop or adopt requirements to ensure the continuing airworthiness of aircraft within its jurisdiction. This ensures that the aircraft comply with all safety standards and regulations, both domestically and internationally. Failure to comply with airworthiness directives can lead to significant consequences. Offences under these regulations can result in both civil and criminal penalties. The exact penalties depend on the nature and severity of the breach. For instance, non-compliance with an airworthiness directive may lead to fines or imprisonment, as stipulated under various sections of the Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998. These penalties are intended to enforce strict adherence to safety standards and to deter any actions that might compromise the safety of air navigation. The regulatory framework is robust, ensuring that all stakeholders, including aircraft manufacturers, operators, and regulatory authorities, are held accountable for maintaining the highest 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.