AD/HU 269/105 - Tailboom Support Struts

Overview

The Civil Aviation Regulations 1998, enacted by the Commonwealth of Australia, are a comprehensive set of rules governing civil aviation within the country. The regulations include specific directives aimed at ensuring the safety and airworthiness of aircraft. One such directive is AD/HU 269/105, introduced to address the problem of cracking in the tailboom support struts of Schweizer (Hughes) 269 Series Helicopters. The directive was issued to ensure that these critical components are regularly inspected and maintained, thereby preventing potential structural failures that could compromise flight safety. The objective of this directive is to mandate the removal of paint and sealant from the tailboom support struts, followed by a thorough inspection for cracks, and appropriate maintenance actions if necessary. This regulatory measure was introduced following reports of tailboom support strut cracking, which were only detectable after the removal of the protective paint.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 – 105 under the Civil Aviation Safety Authority Schedule of Airworthiness Directives, pertains to the maintenance and inspection requirements for Schweizer (Hughes) 269 Series Helicopters. This legislation applies to all models of Schweizer (Hughes) 269 Series helicopters, mandating that the tailboom support struts be chemically stripped of paint and sealant at their tapered ends, and then inspected for cracks using a colour contrast or fluorescent dye penetrant in accordance with Civil Aviation Order 108.10. The inspection must focus on the surface between the bolt holes, and if no cracks are detected and the nicks, dents, and scratches are within specified limits, the struts should be cleaned and repainted. Compliance with these regulations requires that the inspection be conducted before the helicopter reaches 200 hours of time in service after 17 August 1995. This directive extends to the entire Commonwealth of Australia and is overseen by the Civil Aviation Safety Authority. There are no stated exclusions or exemptions in this directive, and it is enforced through subordinate instruments as necessary.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, establishes the Civil Aviation Safety Authority (CASA) Schedule of Airworthiness Directives for Schweizer (Hughes) 269 Series Helicopters. The directive AD/HU 269/105 focuses on the tailboom support struts of these helicopters. According to section 9/95 of the directive, the main requirement is to chemically remove the paint and sealant from the tapered ends of the tailboom support struts, as illustrated in Figure 1. This should be followed by an inspection for cracks using a colour contrast or fluorescent dye penetrant in compliance with CAO 108.10. The inspection should focus particularly on the surface between the bolt holes. If no cracks are found and any nicks, dents, or scratches are within the limits specified in the Schweizer HMI, the struts should be cleaned and repainted. The regulations impose specific obligations on the parties involved. The primary requirement is to conduct the aforementioned inspection of the tailboom support struts before the helicopter has accumulated 200 hours of time in service after 17 August 1995. This ensures that the structural integrity of the tailboom support struts is regularly checked to prevent potential hazards. The compliance with the inspection schedule and the subsequent maintenance actions, such as chemical cleaning, inspection, and repainting, are critical to maintaining the airworthiness of the helicopter. Failure to comply with the provisions of AD/HU 269/105 can lead to significant consequences. The regulations do not explicitly state the penalties for non-compliance, but any breach of airworthiness directives can result in severe civil or criminal penalties under the Civil Aviation Act 1988. These may include substantial fines, suspension or revocation of the aircraft’s certificate of airworthiness, and potential criminal charges if the non-compliance leads to an accident or endangers public safety. Ensuring adherence to these directives is, therefore, crucial for the safety and legality of operating Schweizer (Hughes) 269 Series Helicopters in Australia.