AD/DHC-1/11 - Elevator Trim Tab Cable - Inspection - CANCELLED

Overview

The Civil Aviation Act 1988, enacted by the Australian Parliament, serves as a foundational piece of legislation to regulate civil aviation safety in Australia. The Act empowers the Governor-General to make regulations necessary for the safety of air navigation, which includes the issuance of airworthiness directives to ensure the continued safety and airworthiness of aircraft and aeronautical products. In accordance with the Civil Aviation Safety Regulations 1998, the Civil Aviation Safety Authority (CASA) has the authority to issue airworthiness directives that are considered legislative instruments under the Legislative Instruments Act 2003. These directives are essential for maintaining the continuing airworthiness of aircraft, in line with Australia's obligations under the Convention on International Civil Aviation and its annexes. The objective of these regulations is to uphold the highest safety standards in civil aviation, ensuring the protection of the public and the integrity of the national airspace. The cancellation of an airworthiness directive, such as the Australian AD/DHC-1/11 affecting De Havilland DHC-1 model aeroplanes, is an example of how the Civil Aviation Act 1988 and its regulations are applied in practice. The decision to cancel this directive was made by CASA, following an assessment that the unsafe condition no longer existed. This action aligns with Australia's commitment to international standards and the responsibilities of the State of Registry in maintaining aircraft airworthiness. Importantly, the cancellation of such a directive does not require consultation with the Australian public, as determined by the Office of Best Practice Regulation, and does not necessitate a Regulatory Impact Statement. The legislative framework thus ensures that safety measures are effectively implemented and adjusted as necessary, with a focus on the continuous improvement of aviation safety standards.

Scope and Application

The Civil Aviation Safety Regulations 1998, under the Civil Aviation Act 1988, empower the Civil Aviation Safety Authority (CASA) to issue airworthiness directives (ADs) for specific types of aircraft or aeronautical products. These ADs are legislative instruments, serving as a means to ensure the continuing airworthiness of aircraft as mandated by the Convention on International Civil Aviation, particularly under Annex 8. The State of Design holds primary responsibility for the ongoing airworthiness of an aircraft type, while the State of Registry, in this case, CASA, is tasked with ensuring compliance with airworthiness requirements. The regulation and subsequent cancellation of AD/DHC-1/11 for De Havilland DHC-1 model aeroplanes exemplifies the practical application of these provisions, demonstrating CASA’s role in maintaining safety standards in line with international obligations. The authority to issue and cancel such directives is exercised without public consultation or a Regulatory Impact Statement, reflecting the specialised nature of aviation safety regulation. The AD cancellation is a direct result of Australia's adherence to international standards, highlighting the interplay between national legislation and global aviation safety protocols.

Key Provisions

The Civil Aviation Safety Regulations 1998, under regulation 39.001, empower the Civil Aviation Safety Authority (CASA) to issue airworthiness directives (ADs) for specific types of aircraft or aeronautical products (section 39.001). These directives are essential tools for ensuring the ongoing safety and airworthiness of aircraft, aligning with the overarching goal of maintaining the safety of air navigation as mandated by the Civil Aviation Act 1988 (section 98). An AD, as described in subregulation 39.001(5), is classified as a disallowable instrument under the Acts Interpretation Act 1901 and thus qualifies as a legislative instrument as per the Legislative Instruments Act 2003. These directives are integral to the global framework for aircraft safety, as stipulated by Annex 8 to the Convention on International Civil Aviation, which assigns the State of Design the responsibility for ensuring the continuing airworthiness of an aircraft type. The obligations imposed by these regulations are comprehensive and involve both the State of Design and the State of Registry. The State of Design is tasked with providing all necessary information to the appropriate States of Registry to maintain the airworthiness of aircraft types. Meanwhile, the State of Registry, such as Australia through CASA, must implement or adopt requisite measures to ensure the continuing airworthiness of individual aircraft registered within its jurisdiction. For instance, CASA previously issued AD/DHC-1/11 concerning De Havilland DHC-1 model aeroplanes, but has since cancelled this directive due to the resolution of the unsafe condition identified. This cancellation took effect on 25 September 2008, and no further action is required as the unsafe condition no longer exists. In terms of legal implications, the issuance and cancellation of ADs carry significant weight. The cancellation of AD/DHC-1/11 was carried out in accordance with subsection 84A(2) of the Civil Aviation Act 1988, reflecting the authority and responsibility of CASA in managing airworthiness directives. While these directives are critical, they are not subject to public consultation or a Regulatory Impact Statement, as determined by the Office of Best Practice Regulation. However, any breaches of the regulations or failure to comply with ADs could lead to substantial civil or criminal consequences. Although specific penalties are not detailed in the text, non-compliance with airworthiness directives can typically result in severe penalties, including fines and potential criminal charges for endangering public safety.