AD/BELL 412/27 - Tailboom Upper Longeron

Overview

The Civil Aviation Regulations 1998, under Part 39 - 105, incorporate Airworthiness Directives for various aircraft, including the Bell Helicopter Textron 412 Series Helicopters. The specific directive AD/BELL 412/27 pertains to the tailboom upper longeron for models 412 with specified serial numbers, addressing a critical safety concern regarding cracked longeron splices. This directive was introduced to mitigate risks associated with structural integrity, ensuring the safety of these aircraft in operation. Enacted by the Commonwealth of Australia, the directive aims to mandate inspections and modifications to prevent potential structural failures, thereby safeguarding the aviation industry and the public. The directive mandates compliance with Bell Alert Service Bulletin No 412-90-49, requiring actions to be taken prior to 30 November 1990 and at regular intervals not exceeding 300 hours of time in service after the initial requirement. This legislative measure underscores the commitment to maintaining high safety standards in civil aviation, reflecting a policy objective to proactively address and rectify safety deficiencies in aircraft design and operation.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, applies to the Bell Helicopter Textron 412 Series Helicopters with particular serial numbers, namely those ranging from 33001 through 33211, 34001 through 34013, and 36001 through 36013. This legislative instrument mandates compliance with the Airworthiness Directives concerning the tailboom upper longeron, outlined in AD/BELL 412/27. The regulations are applicable to these specific helicopter models to ensure safety and structural integrity by addressing incidents of cracked longeron splices. The geographic and jurisdictional reach of this legislation is Commonwealth-wide, as it is issued under the authority of the Australian government. The Act requires adherence to the Bell Alert Service Bulletin No 412-90-49, with the first requirement needing to be addressed before 30 November 1990, and subsequent actions to be taken at intervals not exceeding 300 hours of time in service after the incorporation of the initial requirement. There are no stated exclusions or exemptions within the scope of this directive, and the legislation extends its application through the issuance of specific service bulletins and maintenance schedules.

Key Provisions

The Civil Aviation Regulations 1998, under PART 39 - 105, specifically addresses airworthiness directives for particular aircraft models, such as the Bell Helicopter Textron 412 Series Helicopters (sections 39.105(1) and (2)). In this context, the regulation mandates that certain models of the Bell 412 helicopter, specifically those with serial numbers ranging from 33001 to 33211, 34001 to 34013, and 36001 to 36013, must adhere to specific airworthiness directives. The key requirement outlined in the regulation is that the action must be taken in accordance with Part 1 and Part 2 of Bell Alert Service Bulletin No 412-90-49. This directive pertains to addressing issues of cracked longeron splices, necessitating both access for inspection and modifications to enhance structural integrity. The obligations imposed by the regulation are clear and specific. Operators of the affected Bell 412 helicopters must ensure that any actions taken are in line with the directives provided in the Bell Alert Service Bulletin No 412-90-49. This includes not only the initial compliance before a specified deadline (prior to 30 November 1990) but also ongoing maintenance and inspections at intervals not exceeding 300 hours of time in service after the initial compliance. The purpose of these mandates is to prevent incidents related to the structural weaknesses in the tailboom upper longeron splices, which have been identified as potential safety hazards. Failure to comply with the requirements set forth in the Civil Aviation Regulations 1998 can lead to serious consequences. The regulation does not explicitly state penalties but implies that non-compliance could result in significant safety risks. Given the critical nature of airworthiness directives, any breach could potentially lead to enforcement actions by the Civil Aviation Safety Authority (CASA). Such actions could include fines, operational restrictions, or even grounding of the aircraft until the deficiencies are rectified. The precise penalties are not detailed within the text provided, but they are likely to be severe given the implications for aviation safety.