AD/S-76/60 - Swashplate Assembly Uniball Bearing Retainer

Overview

The Civil Aviation Regulations 1998 were enacted to provide for the regulation of civil aviation safety in Australia. This legislation, overseen by the Australian Parliament, aims to ensure the safety and efficiency of civil aviation operations across the country. One specific legislative instrument, F2006B06736, was introduced to address a gap identified in the safe operation of Sikorsky S-76 Series Helicopters. This directive was issued by the Civil Aviation Safety Authority to rectify issues related to the installation of incorrect bolts in the swashplate assembly uniball bearing retainer of certain Sikorsky S-76 helicopters. The policy objective behind this directive is to prevent potential safety hazards arising from the improper installation of bolts, ensuring that all aircraft meet required safety standards before further operation. The directive mandates a visual inspection and replacement of any missing or incorrect bolts to mitigate any risk associated with these components.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, mandates the applicability of airworthiness directives, including AD/S-76/60, which concerns the swashplate assembly uniball bearing retainer on Sikorsky S-76 Series Helicopters. This directive applies to S76A, B, and C helicopters with certain serial numbers and specific swashplate assembly part numbers. The directive mandates a one-time visual inspection to check for missing retainer bolts, which must be replaced with serviceable AN3-5A bolts, and a one-time inspection of each retainer bolt with a magnet to ensure they are steel, replacing any aluminium bolts found with AN3-5A bolts. Compliance is mandatory before further flight after the directive's effective date of 18 August 1998, ensuring that the identified safety issues are addressed to maintain airworthiness standards. This directive is part of a broader regulatory framework managed by the Civil Aviation Safety Authority (CASA) and is applicable within the Australian jurisdiction, enforcing compliance with safety standards set forth by international aviation authorities, such as the Federal Aviation Administration (FAA).

Key Provisions

The Civil Aviation Regulations 1998, particularly in PART 39 - 105, includes a schedule of airworthiness directives (AD/S-76/60) that pertain to specific aircraft models, such as the Sikorsky S-76 Series Helicopters. This regulation applies to S76A, B, and C helicopters with serial numbers prior to 760488, which have specific swashplate assemblies installed (section 1). The main requirements of this directive (section 2) include a one-time visual inspection of the swashplate assembly uniball bearing retainer to check for missing retainer bolts, with any missing bolts to be replaced with serviceable AN3-5A bolts. Additionally, each swashplate assembly retainer bolt (of which there are 12) must be inspected with a magnet to ensure that they are steel bolts, not aluminium, as only steel bolts will attract the magnet; any aluminium bolts found must be replaced one at a time with serviceable AN3-5A bolts. Compliance with this directive (section 3) is mandatory unless the required inspections and repairs have already been performed. The directive becomes effective on 18 August 1998, and any further flight of the affected helicopters must not occur before the required inspections and any necessary repairs have been completed. The directive references Sikorsky Aircraft Corporation Service Bulletin 76-65-47, dated July 31, 1998, and also mentions the FAA Priority Letter AD 98-17-15 as relevant documents related to the directive. The directive was issued in response to reports of the installation of aluminium bolts on certain swashplate assemblies, aiming to ensure safety by confirming the presence and correct type of bolts. The obligations and requirements imposed by this airworthiness directive include the necessity for operators of affected Sikorsky S-76 Series Helicopters to conduct thorough inspections of the specified swashplate assembly components. This involves visually inspecting the retainer bolts for completeness and using a magnet to verify the material of each bolt, replacing any non-compliant bolts with the specified serviceable AN3-5A bolts. These obligations are essential to ensure that the helicopters remain airworthy and comply with safety standards set forth by the Civil Aviation Safety Authority. The breach of these obligations can lead to significant consequences. While the specific penalties are not outlined in the provided text, the non-compliance with airworthiness directives can result in severe civil or criminal penalties under Australian aviation law. These can include fines, suspension or revocation of the aircraft's certificate of airworthiness, and potential criminal charges if the non-compliance is found to have contributed to an aviation accident or incident. The seriousness of these consequences underscores the importance of adhering to the requirements set forth in the airworthiness directive.