AD/CESSNA 177/21 - Nose Landing Gear Upper Support Locknut - CANCELLED

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Legislation au F2008L02529 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, the Civil Aviation Safety Authority (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.

CASA or its predecessors issued AD/CESSNA 177/21 affecting Cessna 177 model aircraft.  CASA has reviewed this AD and as a result has cancelled it.  The cancellation will become effective on 31 July 2008.  No replacement AD is required.

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, 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, enacted by the Parliament of Australia, establishes a framework for ensuring the safety of air navigation. This Act allows for the creation of regulations by the Governor-General to protect air navigation safety, with the Civil Aviation Safety Regulations 1998 being a key instrument in this regard. Specifically, regulation 39.001 empowers the Civil Aviation Safety Authority (CASA) to issue airworthiness directives (ADs) for certain aircraft or aeronautical products, ensuring they meet continuing airworthiness standards. These ADs are legislative instruments that align with international standards set out in Annex 8 to the Convention on International Civil Aviation, which places the responsibility for the continuing airworthiness of aircraft types with the State of Design and the State of Registry. The Civil Aviation Safety Regulations 1998 stipulate that ADs are disallowable instruments, meaning they can be reviewed and cancelled if necessary to comply with international obligations. In light of Australia's commitments under the Convention on International Civil Aviation, CASA issued an AD affecting Cessna 177 model aircraft, but has since cancelled this directive. The cancellation, effective from 31 July 2008, was made without public consultation and does not require a Regulatory Impact Statement. This decision was executed by the Manager, Airframes in the Airworthiness Engineering Branch on behalf of CASA, in accordance with the provisions of the Civil Aviation Act 1988. The cancellation of the AD reflects the need to adhere to international standards and obligations while ensuring the safety of air navigation in Australia.

Scope and Application

The Civil Aviation Act 1988, specifically under regulation 39.001 of the Civil Aviation Safety Regulations 1998, mandates that the Civil Aviation Safety Authority (CASA) may issue airworthiness directives (ADs) concerning specific kinds of aircraft or aeronautical products. This regulatory power is vested in CASA to ensure the safety of air navigation in Australia. ADs are legislative instruments, as stipulated by the Legislative Instruments Act 2003, and they serve as a crucial mechanism for maintaining the continuing airworthiness of aircraft. These directives are integral to fulfilling the obligations under Annex 8 to the Convention on International Civil Aviation, where the State of Design has the overarching responsibility for the continuing airworthiness of an aircraft type. Furthermore, the State of Registry is tasked with ensuring the continuing airworthiness of individual aircraft, aligning with the international standards set forth by the Convention. The specific AD/CESSNA 177/21 affecting Cessna 177 model aircraft, issued by CASA or its predecessors, has been cancelled effective 31 July 2008, reflecting Australia’s commitment to international civil aviation standards and obligations.

Key Provisions

The Civil Aviation Act 1988 (section 98) empowers the Governor-General to make regulations, with a focus on ensuring the safety of air navigation. Under this provision, the Civil Aviation Safety Regulations 1998 (regulation 39.001) allow the Civil Aviation Safety Authority (CASA) to issue airworthiness directives (ADs) for specific types of aircraft or aeronautical products. According to subregulation 39.001(5), an AD is classified as a disallowable instrument under the Acts Interpretation Act 1901 and, as such, is a legislative instrument in accordance with the Legislative Instruments Act 2003. This framework ensures that ADs serve as a key mechanism for maintaining the continuing airworthiness of aircraft, a responsibility primarily borne by the State of Design under Annex 8 of the Convention on International Civil Aviation. The obligations imposed by these regulations are multifaceted. The State of Design must provide necessary information to ensure the continuing airworthiness of an aircraft type, which is typically conveyed through ADs. Similarly, the State of Registry for individual aircraft must develop or adopt requirements to ensure that each aircraft remains airworthy. In practice, this means that CASA issues ADs to address specific safety concerns, and these directives must be followed by aircraft operators and others governed by the regulations. The adherence to these ADs is critical in maintaining the high safety standards expected in civil aviation. Failure to comply with the requirements set forth in these regulations can result in significant legal consequences. Although the specific offences and penalties are not detailed in the provided text, it is understood that non-compliance with ADs could lead to civil or criminal liability under the Civil Aviation Act 1988. The exact penalties could include fines or imprisonment, depending on the severity of the breach and the discretion of the court. The overarching aim is to ensure that all stakeholders maintain the highest safety standards, thereby protecting the public and contributing to the overall safety of air navigation. In summary, the Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998 establish a robust framework for ensuring the airworthiness of aircraft through the issuance and enforcement of airworthiness directives. The obligations on the State of Design and the State of Registry are clear, and the consequences of non-compliance underscore the importance of adhering to these safety measures. The detailed legislative provisions and the regulatory oversight by CASA ensure that the safety of air navigation is maintained to the highest possible standards.

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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.