AD/DH 82/1 - Undercarriage Strut - Modification

Overview

The Civil Aviation Safety Regulation 1998, enacted by the Australian Parliament, establishes and enforces civil aviation safety standards. This legislation aims to address the need for consistent and rigorous safety regulations within Australia's civil aviation sector, ensuring the safety of passengers, crew, and the general public. The policy objective is to provide a comprehensive framework for aviation safety, promoting a high standard of airworthiness and operational safety throughout the country. The regulation is instrumental in mitigating risks associated with civil aviation by setting forth mandatory safety standards and procedures that operators must adhere to. Through these regulations, the Civil Aviation Safety Authority is empowered to oversee and enforce compliance, thereby enhancing the overall safety of Australia's aviation industry.

Scope and Application

The F2006B08895 Legislative Instrument, specifically AD/DH 82/1, pertains to the modification of the undercarriage strut for all models of DH 82 (Tiger Moth) Series aeroplanes. This directive applies to all entities and individuals who own, operate, or maintain these aircraft within Australia. The requirement encompasses replacing certain components such as the lower fork end fitting and the lower fork bolt, as well as modifying other parts to ensure compliance with the specified technical standards. The directive also mandates the installation of a check cable to prevent potential disengagement of the landing gear components. Compliance with these directives is mandatory and must be achieved forthwith. The directive is comprehensive in its approach, detailing the necessary modifications through referenced figures, and does not explicitly mention any exclusions or exemptions. The application of this legislation is enforced across the entire Commonwealth, ensuring a consistent standard for aircraft maintenance and safety throughout Australia.

Key Provisions

The main operative sections of the legislation (AD/DH 82/1) detail specific modifications to be made on the DH 82 (Tiger Moth) series aeroplanes, particularly focusing on the undercarriage strut. Section 1 mandates the replacement of the lower fork end fitting P/N 45491 and DHA 2185 with a steel fitting that conforms to Figure 3 or with steel fitting P/N DHA 2195. Section 2 requires modification of the lower fork bolt P/N H24060 in accordance with Figure 4. Section 3 specifies that the fitting should be attached to the centre tube using 3/16 inch diameter rivets of BSS S2 material as depicted in Figure 1. Section 4 requires that the rivets attaching the upper retaining sleeve P/N 62814 be replaced with rivets of BSS S2 material. Finally, Section 5 stipulates the installation of a check cable as shown in Figure 2, or compliance with ANO 105.1.14.5.5.1, to prevent disengagement of the landing gear components in case of rivet failure. The legislation imposes several obligations on the parties governed by it. Primarily, it requires operators and owners of DH 82 (Tiger Moth) series aeroplanes to carry out the specified modifications to their undercarriage struts to ensure safety and compliance with the standards set forth. These modifications must be made forthwith as indicated in the compliance section. Each modification step, from replacing specific parts to installing new fittings and check cables, must be performed meticulously following the provided figures and specifications. Failure to adhere to these requirements can compromise the structural integrity and safety of the aircraft. The legislation also specifies potential consequences for non-compliance. While the document does not explicitly outline penalties, non-compliance with Airworthiness Directives in Australia generally leads to significant repercussions. Such non-compliance can result in the aircraft being grounded until the required modifications are completed, potentially leading to operational disruptions and financial losses for operators. Furthermore, severe non-compliance could lead to enforcement actions by the Civil Aviation Safety Authority (CASA), including fines and other regulatory penalties. While specific penalties are not detailed within this legislative instrument, the overarching aim is to ensure the highest standards of airworthiness are maintained.