AD/GAZELLE/9 - Main Gearbox Input Gear Flange - Inspection of Attachment Nut

Overview

The Civil Aviation Regulations 1998, amended through legislative instrument F2006B10255, addresses the specific issue of ensuring the airworthiness of Eurocopter SA341 and SA342 (Gazelle) series helicopters. This regulation was enacted to fill a critical gap in the maintenance and safety protocols for these helicopter models, particularly focusing on the main gearbox input gear flange. The Australian Government, through the relevant legislative body, implemented this directive to enhance aviation safety by requiring inspections to verify that the correct torque load has been applied to the attachment nut of the main gearbox input gear flange. The policy objective is to prevent potential mechanical failures that could compromise the safety of flight operations. The regulation mandates that models SA-341 and SA-342 equipped with certain main gearbox parts must undergo compliance checks within 100 hours of service time after 30 June 1980, referencing the manufacturer's guidance in Gazelle Service Bulletin 65.19. This directive ensures adherence to the stringent safety standards set by the Civil Aviation Safety Authority, thereby mitigating risks associated with the specified components.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, applies to the maintenance and operation of Eurocopter SA341 and SA342 (Gazelle) series helicopters, with the particular focus being on the main gearbox input gear flange. This applies to aircraft models SA-341 and SA-342 equipped with main gearbox parts numbered from P/N 341A.32.1000.01 to.05, provided they have not been modified according to AMS 07.7076/S374. The regulation is designed to ensure the safety and airworthiness of these helicopters by requiring an inspection of the attachment nut of the main gearbox input gear flange. The inspection must be carried out within 100 hours of the aircraft’s time in service after 30 June 1980, as stipulated in Gazelle Service Bulletin 65.19. The regulations are enforced by the Civil Aviation Safety Authority (CASA) and apply nationally within Australia, ensuring compliance with safety standards set by the Commonwealth. The application of these regulations is not limited by state or territory boundaries, but rather extends across the entire nation to maintain a consistent standard of aviation safety.

Key Provisions

The Civil Aviation Regulations 1998, under Part 39 - 105, includes a specific Airworthiness Directive (AD) concerning the Eurocopter SA341 and SA342 (Gazelle) Series Helicopters. This directive, identified as AD/GAZELLE/9, focuses on the inspection of the attachment nut for the main gearbox input gear flange (section 5/80). This directive applies to the SA-341 and SA-342 models equipped with main gearbox part numbers ranging from 341A.32.1000.01 to.05, unless these models have been modified in accordance with AMS 07.7076/S374. The directive mandates that the inspection be conducted in compliance with Gazelle Service Bulletin (SB) 65.19 and must be completed within 100 hours of time in service after 30 June 1980. The primary obligation under this directive is to ensure that the correct torque load has been applied to the notched nut that retains the input gear flange. This requirement is intended to prevent potential issues that may arise from improper attachment, which could compromise the structural integrity of the gearbox. Operators and owners of the affected helicopters are required to adhere to the inspection protocol outlined in the Gazelle SB 65.19 to ensure compliance with safety standards. The directive underscores the importance of regular and thorough inspections to maintain the airworthiness of these helicopters. Failure to comply with the AD/GAZELLE/9 could result in serious safety implications, as the proper functioning of the main gearbox is critical to the overall performance and safety of the helicopter. The legislation does not specify particular penalties for non-compliance within the AD itself, but the overarching Civil Aviation Regulations 1998 provide a framework for enforcing compliance. Violations of airworthiness directives can lead to enforcement actions, which may include fines, suspension of airworthiness certificates, or other regulatory penalties. The specific consequences would depend on the extent of the non-compliance and the discretion of the Civil Aviation Safety Authority (CASA). In summary, the AD/GAZELLE/9 directive mandates a specific inspection of the main gearbox input gear flange attachment nut on Eurocopter SA341 and SA342 helicopters, requiring compliance within 100 hours of time in service after 30 June 1980. Operators must adhere to the inspection protocol specified in Gazelle SB 65.19. Non-compliance with this directive could lead to significant safety risks and potential regulatory penalties under the Civil Aviation Regulations 1998. The directive aims to ensure that the helicopters maintain their airworthiness by addressing a specific issue identified by the manufacturer.