AD/LA-4/1 - Nose Landing Gear Drag Strut - Inspection

Overview

The Civil Aviation Regulations 1998, specifically Part 39 - 105, includes the Civil Aviation Safety Authority's Schedule of Airworthiness Directives, governing various aircraft types and components. One such directive, AD/LA-4/1, pertains to nose landing gear drag struts in Consolidated Aeronautics, Colonial, and LA-4 Series Aeroplanes. This directive was enacted to ensure the safety and airworthiness of these aircraft by mandating a thorough inspection of the nose landing gear drag strut bolt at fuselage Station 12 5/8. The directive was introduced to address potential safety risks associated with the use of incorrect bolts in the drag strut assembly, ensuring that only approved bolts, specifically AN 5-16A or AN 5-17A, are installed with the bolt head positioned on the right side of the aircraft. This requirement was to be met by 30 September 1965, reflecting a timely policy objective to maintain stringent safety standards across the specified aircraft fleet. The directive is part of the overarching legislative framework managed by the Civil Aviation Safety Authority, overseen by the Australian Parliament, to safeguard the public and promote safe aviation practices.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, addresses the safety requirements for various aircraft including those of the Consolidated Aeronautics, Colonial, and LA-4 Series. This particular regulation, AD/LA-4/1, pertains to the inspection of the nose landing gear drag strut on all Lake LA-4 Series aeroplanes. The regulation mandates that the bolt at the top of the nose landing gear drag strut at fuselage Station 12 5/8 must be inspected to ensure that the correct bolt, either an AN 5-16A or an approved equivalent, is installed with the bolt head positioned on the right-hand side of the aircraft. If an AN5-15A bolt is detected, further inspection of the bolt holes in the drag strut and the supporting assembly is required to check for elongation, with any necessary rework to be conducted in accordance with Lake Aircraft Division SL No. 11B dated February 22, 1965. All replacement bolts must be of the AN 5-16A or AN 5-17A type, with the latter being used if bushings are installed, and must also have the head on the right side of the aircraft. This requirement must be met before 30 September 1965. The regulation applies to all Lake LA-4 Series aircraft within the Commonwealth of Australia and is enforced by the Civil Aviation Safety Authority.

Key Provisions

The Civil Aviation Regulations 1998, specifically under Part 39 - 105, include detailed safety directives regarding the airworthiness of certain aircraft models. Section AD/LA-4/1 pertains to the inspection of the nose landing gear drag strut on Consolidated Aeronautics, Colonial, and LA-4 Series aeroplanes. This directive (8/65) requires that the bolt at the top of the nose landing gear drag strut, located at fuselage Station 12 5/8, must be inspected to ensure the installation of an AN 5-16A bolt or an approved equivalent. Furthermore, the bolt head must be positioned on the right-hand side of the aircraft. If an AN 5-15A bolt is detected, additional inspections for bolt hole elongation and supporting assembly wear are mandatory, with rework procedures outlined in Lake Aircraft Division SL No. 11B dated February 22, 1965. Any replacement bolts must adhere to the specified types, i.e., AN 5-16A or AN 5-17A, with the bolt head on the right side of the aircraft, with AN 5-17A being appropriate when bushings are installed. The obligations under this legislation are clear and precise. Operators of Lake LA-4 Series aeroplanes must ensure that the specified bolt is correctly installed and positioned. This requirement extends to inspecting the bolt holes and supporting assembly for any signs of elongation or wear. Compliance with the directive must be achieved before 30 September 1965. The regulations mandate a thorough and systematic approach to maintaining the structural integrity of the nose landing gear drag strut, ensuring that the aircraft remains airworthy. Failure to comply with the provisions outlined in AD/LA-4/1 can lead to severe consequences. The legislation does not explicitly state the penalties for non-compliance; however, general civil aviation regulations provide a framework for potential enforcement actions. Non-compliance may result in the grounding of the aircraft until the necessary inspections and repairs are completed, which could disrupt operations and potentially incur financial penalties. Additionally, there could be implications for the airworthiness certificate of the aircraft, leading to more extensive scrutiny and potential revocation if the issue is deemed critical to safety. In summary, the Civil Aviation Regulations 1998 mandate specific inspection and compliance requirements for the nose landing gear drag strut on Lake LA-4 Series aeroplanes. Operators must ensure the correct installation and positioning of the specified bolt, with further inspections and rework as necessary. Non-compliance with these directives could result in operational disruptions and potential financial penalties, as well as implications for the aircraft’s airworthiness certificate.