AD/JBK 117/14 - Tail Rotor Drive Long Shaft Hanger Bearing - Inspection of Fasteners

Overview

The Civil Aviation Regulations 1998, specifically Part 39, were enacted to establish and maintain the highest standards of airworthiness for aircraft operating in Australia. The 1998 Regulations were introduced to address the need for a comprehensive and updated framework governing aviation safety and operational standards, replacing the earlier Civil Aviation Regulations of 1988. The enacting body was the Australian Parliament, with the policy objective being to ensure the safety and efficiency of civil aviation through stringent regulatory oversight. This legislation encompasses a wide range of safety directives, including the specific Airworthiness Directive AD/JBK 117/14 concerning the Kawasaki BK 117 Series Helicopters. This directive mandates the inspection of tail rotor drive long shaft hanger bearing fasteners to prevent potential safety hazards arising from under-torqued bolts, ensuring the ongoing safety and reliability of these aircraft.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, mandates the Kawasaki BK 117 Series Helicopters, irrespective of their serial numbers, to comply with Airworthiness Directive AD/JBK 117/14, which concerns the inspection of fasteners for the tail rotor drive long shaft hanger bearing. This directive applies to all operators and entities that own or operate Kawasaki BK 117 helicopters within the Australian jurisdiction, enforcing compliance with the Australian Civil Aviation Safety Authority (CASA) standards. The requirement necessitates that the fasteners of the tail rotor drive long shaft hanger bearing be inspected for torque loading, following the detailed instructions outlined in Kawasaki Service Bulletin No. KSB-117-148 dated 25 February 1999. Any major defects found during this inspection must be reported to Kawasaki Heavy Industries in Japan, as specified in the directive. The directive came into effect on 18 March 1999, and compliance is mandatory before the next flight after this date. This regulation underscores the importance of maintaining precise torque loading to prevent issues such as excessive wear in bolt holes, which have been identified as a potential safety hazard.

Key Provisions

The Civil Aviation Regulations 1998, particularly Part 39, subsection 105, outline specific directives for ensuring the airworthiness of the Kawasaki BK 117 Series Helicopters. One such directive, AD/JBK 117/14, mandates an inspection of the tail rotor drive long shaft hanger bearing fasteners to ensure proper torque loading (section 5/99TX). This directive applies to all Kawasaki BK 117 helicopters, irrespective of their serial numbers. The inspection must be carried out in accordance with the instructions provided in Kawasaki Service Bulletin No. KSB-117-148 dated 25 February 1999. Furthermore, all inspection reports must be formatted and submitted as specified in the service bulletin, and any major defects identified during this inspection process should be immediately reported to Kawasaki Heavy Industries, Japan. The obligations under this directive are quite clear. Operators of Kawasaki BK 117 helicopters must ensure that the inspections are conducted before the next flight following the directive's effective date. This requirement is critical to maintain the safety and airworthiness of the aircraft. The directive becomes effective on 18 March 1999, and compliance is mandatory. The directive references an issue identified with excessive wear in bolt holes that secure the hanger bearing of the tail rotor drive long shaft, believed to stem from under torquing of the bolts during maintenance or assembly. The directive aims to rectify this by ensuring that the fasteners are correctly torqued, and any found to be under-torqued must have their bolt holes measured for wear. Failure to comply with this Airworthiness Directive could have severe consequences. The regulations impose strict obligations on aircraft operators to adhere to the inspection and reporting requirements. Non-compliance could potentially lead to significant safety hazards, as the directive is aimed at preventing issues that could compromise the structural integrity of the helicopter. The regulatory framework is designed to ensure that all necessary steps are taken to maintain the highest safety standards. In the event of a breach, the consequences could include penalties, enforcement actions, and potentially grounding of the affected aircraft until the issues are resolved. The specific penalties and enforcement mechanisms are not detailed in the directive but would typically align with broader civil aviation regulatory practices in Australia.