AD/SD3-60/37 - Horizontal Stabiliser Attachment Lugs

Overview

The Civil Aviation Regulations 1998, enacted by the Australian Government, provide a comprehensive framework for ensuring the safety and efficiency of civil aviation within Australia. One of the key components of these regulations is Part 39, which specifically addresses airworthiness directives and safety measures to mitigate risks associated with aircraft operations. Among these directives, AD/SD3-60/37 focuses on addressing the structural integrity of horizontal stabiliser attachment lugs in SD3-60 series aeroplanes. This directive was introduced to address a specific problem identified by the manufacturer, which necessitated additional inspections due to concerns about the integrity of the attachment lugs after a certain number of flights. The Civil Aviation Safety Authority mandates compliance with this directive to ensure that the aircraft remain safe for operation, particularly for those with tailplanes that have accumulated 20,000 or more flights. The policy objective is to enhance the safety and reliability of these aircraft by requiring modifications and regular ultrasonic inspections as stipulated. The enactment of this directive by the Civil Aviation Safety Authority reflects a commitment to maintaining high safety standards in Australia’s aviation industry. By requiring modifications and regular inspections of the horizontal stabiliser attachment lugs, the directive aims to prevent potential failures that could compromise the safety of the aircraft. The requirement for compliance before 29 July 1993 and periodic reinspections ensures that these safety measures are consistently applied, thereby reducing the risk of structural failure and enhancing overall aviation safety.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, pertain to the Civil Aviation Safety Authority’s Schedule of Airworthiness Directives, which governs the safety and airworthiness of aircraft operating within Australian airspace. One such directive, AD/SD3-60/37, focuses on the horizontal stabiliser attachment lugs of all SD3-60 series aeroplanes that have accumulated 20,000 or more flights. This regulation applies to the aircraft themselves, requiring modifications and ultrasonic inspections of the forward and aft tailplane attachment lugs, both on the upper and lower surfaces, in accordance with Service Bulletin SB SD360-55-19. The requirement to comply with these inspections was classified as mandatory by the UK Civil Aviation Authority, highlighting the international significance of these safety measures. Compliance must be achieved before 29 July 1993, with subsequent reinspections mandated at intervals of not more than 4000 flights. This directive underscores the importance of regular maintenance and safety inspections to ensure the continued airworthiness of SD3-60 series aeroplanes.

Key Provisions

The Civil Aviation Regulations 1998, under Part 39, Section 105, specifically in the Schedule of Airworthiness Directives, mandates the modification and inspection of horizontal stabiliser attachment lugs for SD3-60 Series Aeroplanes (Section 39-105). This directive applies to all SD3-60 aircraft that have accumulated 20,000 or more flights (Section 39-105 AD/SD3-60/37). The requirement is to modify the aircraft and conduct ultrasonic inspections of the forward and aft tailplane attachment lugs, both on the upper and lower surfaces, following the instructions laid out in Service Bulletin SD360-55-19 (Section 39-105). It is important to note that this service bulletin has been classified as mandatory by the UK Civil Aviation Authority (Section 39-105). The obligations imposed by this directive are clear and precise. Aircraft operators must ensure that the modifications and inspections are completed before 29 July 1993 (Section 39-105). Additionally, operators must reinspect the horizontal stabiliser attachment lugs at intervals of no more than 4,000 flights (Section 39-105). This ongoing requirement ensures that the structural integrity of the tailplane attachment lugs is continuously monitored and maintained, reducing the risk of potential failure. Failure to comply with the provisions of this airworthiness directive can lead to serious consequences. The Civil Aviation Regulations 1998 outline that non-compliance with airworthiness directives can result in penalties. While specific penalties are not detailed in the text, it is understood that violations could lead to enforcement actions by the Civil Aviation Safety Authority (CASA). The potential consequences could include fines, suspension or revocation of the aircraft’s airworthiness certificate, and possibly legal action against the operators or owners of the aircraft. The severity of the penalties reflects the importance of adhering to these safety requirements to ensure the safety of all persons on board and the overall integrity of the aviation system.