AD/DHC-2/28 - Wing Strut Lower Steel End-Fitting

Overview

The Civil Aviation Regulations 1998, as amended, provide critical safety directives for the aviation industry in Australia. Among these is Part 39 - 105, which mandates Airworthiness Directives for specific aircraft, such as the de Havilland Canada DHC-2 (Beaver) series aeroplanes. The aim of this legislative instrument is to address issues identified with the wing strut lower steel end-fittings on these aircraft. Enacted by the Commonwealth of Australia, this regulation responds to problems of skin corrosion and fastener damage at these critical points, as reported by Transport Canada. The objective is to ensure the ongoing airworthiness of these aircraft by requiring regular inspections and necessary repairs, with compliance mandated within 50 hours after the directive's effective date and then at intervals not exceeding 12 months. This directive underscores the importance of maintaining stringent safety standards to mitigate risks associated with identified structural vulnerabilities.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, applies to the maintenance and inspection of DHC-2 (Beaver) series aeroplanes, focusing on the wing strut lower steel end-fittings. This regulation mandates a visual inspection of the wing strut in accordance with de Havilland Alert Service Bulletin No. A2/48, with a requirement to repair or replace the strut if any damage is detected. The directive applies to all Model DHC-2 aircraft equipped with steel end-fittings on C2W1115-1/-2 wing struts and necessitates compliance within 50 hours of time in service after 11 November 1993, and thereafter at intervals not exceeding 12 calendar months. The regulation's scope extends to ensuring the airworthiness of these aircraft by addressing service difficulties reported by Transport Canada, which highlighted issues such as skin corrosion and fastener damage at the wing strut lower steel end-fittings. The regulation is designed to enhance safety and operational integrity within the Australian civil aviation sector.

Key Provisions

The key provisions of the Civil Aviation Regulations 1998, specifically PART 39 - 105, concerning the airworthiness directives for the DHC-2 (Beaver) Series Aeroplanes, include the requirement for a visual inspection of the wing strut (section 39-105.020). According to AD/DHC-2/28, the wing strut must be visually inspected in accordance with de Havilland Alert Service Bulletin No. A2/48. If any damage is detected during this inspection, the strut must be repaired or replaced as specified in the Service Bulletin (section 39-105.025). This directive applies to Model DHC-2 aircraft equipped with steel end-fittings on C2W1115-1/-2 wing struts. The regulation references Transport Canada AD CF-93-21 for additional context on the issue of skin corrosion and fastener damage at the wing strut lower steel end-fittings. The obligations imposed by this regulation require operators of DHC-2 aircraft to ensure that the specified inspections and repairs are conducted. Compliance must be achieved within 50 hours of time in service after 11 November 1993, and subsequently at intervals not exceeding 12 calendar months (section 39-105.030). Operators must maintain detailed records of all inspections and any repairs or replacements performed, ensuring that the aircraft remain airworthy and safe for operation. Failure to comply with the airworthiness directives can result in significant legal and operational consequences. The Civil Aviation Safety Authority (CASA) can take enforcement action against operators who do not adhere to these requirements. Such actions may include the issuance of enforcement notices, fines, and in severe cases, the suspension or revocation of the aircraft’s operating certificate. The maximum penalties for non-compliance with these regulations can include substantial financial penalties and potential criminal charges, depending on the severity and impact of the non-compliance on aviation safety. Operators are therefore strongly advised to strictly adhere to the stipulated inspection and repair intervals to avoid these adverse outcomes.