AD/S-76/40 - Power Train Tail Drive Shaft Bearing Support Assembly

Overview

The Civil Aviation Regulations 1998, amended in 2006, were enacted to regulate civil aviation safety and to ensure compliance with international standards. This legislative instrument specifically addresses the airworthiness of aircraft, including Sikorsky S-76 Series Helicopters. The problem it aims to resolve is the potential for unsafe operation of these helicopters due to manufacturing defects in the bearing support assembly bearings, particularly those produced by MRC. The Civil Aviation Safety Authority, established under these regulations, has the policy objective of ensuring that all aircraft are maintained in a safe condition for operation. The authority's role includes issuing airworthiness directives to mitigate identified safety risks, as evidenced by the directive concerning the Sikorsky S-76 Series Helicopters, which mandates compliance with specific maintenance procedures to prevent hazardous conditions.

Scope and Application

The Civil Aviation Regulations 1998, specifically PART 39 - 105, apply to all Sikorsky S-76 series helicopters equipped with bearing support assemblies manufactured by MRC, which must comply with Airworthiness Directive AD/S-76/40. This legislation mandates corrective actions in line with Sikorsky Alert Service Bulletin No. 76-66-20, focusing on the power train tail drive shaft bearing support assembly. The directive is applicable to all model S76 helicopters that have bearing support assembly bearings manufactured by MRC installed, and compliance is required before further flight after 31 July 1985. This requirement is intended to address potential safety issues arising from the assembly of these bearings without grease, ensuring that all affected aircraft meet the necessary safety standards before resuming operations. The scope of this regulation is nationally enforced, thereby extending its application across the Commonwealth of Australia.

Key Provisions

The Civil Aviation Regulations 1998 (Cth), specifically Part 39, contains various provisions governing the safety and operation of civil aircraft in Australia. One such provision is Airworthiness Directive (AD) S-76/40 (AD/S-76/40), which applies to all Sikorsky S-76 series helicopters with bearing support assembly bearings manufactured by MRC installed. This AD mandates compliance with Sikorsky Alert Service Bulletin No. 76-66-20 before further flight after 31 July 1985, to address the risk of bearing support assembly bearings being assembled without grease, potentially leading to failure. Under this directive, helicopter operators and owners must ensure that their Sikorsky S-76 helicopters comply with the requirements outlined in the AD. This includes taking action as specified in the referenced service bulletin, which likely involves inspection, maintenance, or replacement of the affected bearing support assembly components. Operators must ensure that the necessary actions are completed before the helicopter can be flown again, thus maintaining the safety standards required by the Civil Aviation Safety Authority (CASA). Failure to comply with the requirements of AD/S-76/40 can result in serious consequences. Non-compliance with ADs is an offence under the Civil Aviation Act 1988 (Cth), potentially leading to enforcement actions by CASA. The penalties for non-compliance can include fines and other legal actions, reflecting the importance of adhering to safety directives to protect the integrity of civil aviation operations. The maximum penalties for offences related to ADs can be substantial, emphasising the need for strict compliance with CASA's directives.