Overview

The Civil Aviation Regulations 1998, specifically Part 39 - 105 concerning the Civil Aviation Safety Authority's Schedule of Airworthiness Directives, were enacted to ensure the safe operation of aircraft in Australia. This legislation addresses the issue of structural integrity in certain aircraft models, such as the DHC-6 (Twin Otter) Series Aeroplanes, by issuing specific airworthiness directives to mitigate identified risks. The Civil Aviation (Airworthiness) Regulations of 1998 were established by the Parliament of Australia to provide a comprehensive framework for the maintenance and operation of civil aircraft, aiming to protect the public and enhance safety within Australia's airspace. One particular directive, AD/DHC-6/61 Amendment 1, targets the problem of exfoliation corrosion in the wing main spar lower cap angles, aligning with international safety standards and updating compliance timelines to ensure continued airworthiness.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, mandate airworthiness directives applicable to DHC-6 (Twin Otter) series aeroplanes, governing all models registered in Australia. This legislation applies to aircraft operators, maintenance service providers, and aircraft manufacturers who must adhere to specified technical requirements to ensure compliance with safety standards. These regulations are enforced by the Civil Aviation Safety Authority (CASA) and have a national reach, ensuring consistency across the Commonwealth of Australia. The regulations pertain to the maintenance and inspection of the wing main spar lower cap angles, requiring action in accordance with Transport Canada AD CF-87-02, R1, with a particular focus on mitigating exfoliation corrosion. This directive, which reflects an amendment to the original Transport Canada AD, removes flight hour limitations from the compliance time requirements, setting a revised effective date of 11 July 1991 for Australian registered aircraft. The regulation's applicability is broad, encompassing all DHC-6 series aeroplanes within Australia's jurisdiction, with no specific exclusions noted in the primary text, although subordinate instruments may extend or restrict its application.

Key Provisions

The main operative sections of this Civil Aviation Regulation pertain to the Airworthiness Directives for DHC-6 (Twin Otter) series aeroplanes. Specifically, AD/DHC-6/61 Amendment 1 (paragraph 39-105.010) requires action to be taken concerning the wing main spar lower cap angles. The directive mandates that the action should be in accordance with the Technical Requirements of Transport Canada AD CF-87-02, R1, which pertains to exfoliation corrosion in the main spar cap lower angles of these aircraft. Compliance with these requirements must be achieved by the specified date, 11 July 1991, for Australian registered aircraft, reflecting a revision of the related country of origin AD that removed flight hour limitations from the compliance time requirements. The obligations imposed by this Act are clear and specific. Aircraft operators, owners, and maintenance personnel must ensure that the wing main spar lower cap angles are inspected and, if necessary, repaired or replaced in accordance with the specified technical requirements. This involves adhering to the guidance provided by Transport Canada AD CF-87-02, R1, and ensuring that any actions taken are in line with the compliance date mentioned in the directive. Additionally, operators must maintain records of all inspections and actions taken to comply with this directive, as this documentation may be required for future audits or inspections by the Civil Aviation Safety Authority (CASA). Failure to comply with the provisions of this Airworthiness Directive can result in serious consequences. Non-compliance may lead to the grounding of the aircraft until the required actions are completed. Furthermore, there could be legal and regulatory repercussions for the operators, including potential fines and penalties. Although the specific penalties are not detailed in the directive, it is understood that non-compliance with Civil Aviation Regulations can result in significant financial penalties, enforcement actions, and possible criminal charges if the non-compliance leads to safety hazards or incidents. The exact penalties would be determined based on the severity of the non-compliance and any resulting harm or risk to safety.