AD/DH 104/5 Amdt 6 - Wing and Centre Section Lower Spar Booms - Safe Lives

Overview

The Civil Aviation Regulations 1998, as amended through the legislative instrument F2006B08883, specifically address the safety of the DH 104 (Dove) series aeroplanes through Part 39 - 105, which outlines the Civil Aviation Safety Authority's schedule of airworthiness directives. This legislation was enacted to ensure the ongoing airworthiness and safety of the Dove series aircraft by establishing specific requirements for the wing and centre section lower spar booms. The problem this legislation aims to address is the need to manage and extend the operational life of these aircraft while maintaining stringent safety standards. Enacted by the Australian Parliament, the policy objective is to prevent accidents and ensure the safety of passengers and crew by mandating detailed and specific airworthiness directives that are to be adhered to by all operators of Dove series aeroplanes.

Scope and Application

The Civil Aviation Regulations 1998, specifically PART 39 - 105 pertaining to the Civil Aviation Safety Authority Schedule of Airworthiness Directives, applies to all models of the DH 104 (Dove) Series Aeroplanes, including those that have been converted to DH 104 Riley Dove in accordance with STC SA319SO. This legislation mandates adherence to the specified retirement lives for the wing and centre section lower spar booms to ensure safety. The application of this regulation extends to all operators and owners of DH 104 Dove aeroplanes within Australia and its territories, thereby affecting the aviation industry and entities involved in the operation and maintenance of these aircraft. The regulation is geographically applicable across the Commonwealth, ensuring a uniform standard of airworthiness across the nation. However, it allows for individual assessments under specific severe flight conditions, as outlined in Technical News Sheet No. 119. The Riley Dove safe life is based on fatigue meter records, which may be subject to future review based on operational data. Subordinate instruments or technical news sheets may further define compliance and operational specifics.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105 and Schedule of Airworthiness Directives, set out the airworthiness directives for the DH 104 (Dove) Series Aeroplanes, which are detailed in AD/DH 104/5 Amendment 6 (paragraph 1). This legislation mandates that all models of Dove aeroplanes must adhere to specific requirements regarding their wing and centre section lower spar booms. The primary requirement is that the retirement lives of these components must align with the Hawker Siddeley Technical News Sheets CT (104) No. 119, Issue 10, and CT (104) No. 181, Issue 2, with some exceptions (paragraph 2). For instance, Dove aircraft series 1 to 6 and their variants are required to reach a total of 17,500 hours of service before retirement, whereas series 7 and 8 and their variants must reach 14,000 hours (paragraph 2(a) and (b)). Additionally, specific conditions apply to Series 7XC and 8XC, which need to accumulate 14,000 hours plus one-fifth of the hours flown prior to conversion (paragraph 2(c)). Any Dove aircraft series 1 to 6 converted to DH 104 Riley Dove must also adhere to the 17,500 hours requirement (paragraph 2(d)). Operators must also notify the Secretary if severe flight conditions necessitate an individual life assessment as identified in Technical News Sheet No. 119 (paragraph 3). The regulations impose several obligations on the parties involved. Firstly, operators must ensure that their Dove aeroplanes' wing and centre section lower spar booms adhere to the specified retirement lives outlined in the Hawker Siddeley Technical News Sheets. This involves meticulous record-keeping and monitoring of the aircraft's total time in service. Operators must also be vigilant in assessing severe flight conditions that may require individual life assessments for their aircraft and must notify the Secretary accordingly (paragraphs 3 and 6). Furthermore, operators must forward any overriding safe life assessments obtained from the manufacturer to the Secretary to ensure compliance with the specified requirements (paragraph 6). Failure to comply with the provisions outlined in the Civil Aviation Regulations 1998 can result in significant legal consequences. Operators who do not adhere to the specified retirement lives for their Dove aeroplanes' components may face enforcement actions by the Civil Aviation Safety Authority (CASA). While the specific penalties are not detailed in the text, non-compliance with airworthiness directives typically results in regulatory enforcement measures, which can include fines, suspension or revocation of airworthiness certificates, and other administrative penalties. In severe cases, criminal charges could be brought against responsible individuals, leading to imprisonment, as per Australian law. It is crucial for operators to understand and comply with these provisions to ensure the continued airworthiness and safety of their Dove aeroplanes. The regulations aim to prevent potential hazards associated with the deterioration of critical aircraft components, thereby safeguarding both the crew and passengers. By adhering to the specified retirement lives and notifying the Secretary of any severe flight conditions, operators can help maintain the high safety standards required by Australian civil aviation regulations. In conclusion, the Civil Aviation Regulations 1998, under Part 39 - 105 and the Schedule of Airworthiness Directives, impose detailed requirements on Dove aeroplane operators regarding the retirement lives of their aircraft's wing and centre section lower spar booms. Compliance with these directives is mandatory and involves precise monitoring and reporting to the Secretary. Failure to comply can lead to significant legal and safety repercussions, underscoring the importance of adhering to these provisions for the continued safe operation of Dove aeroplanes.