AD/S-76/30 Amdt 1 - Tail Rotor Blade Elliptical Centering Plug and Retaining Pad

Overview

The Civil Aviation Regulations 1998, under the legislative instrument F2006B06713, addresses safety and operational standards within the aviation industry in Australia. Specifically, Part 39 - 105, which pertains to the Civil Aviation Safety Authority’s schedule of airworthiness directives, ensures that aircraft meet necessary safety standards to protect passengers and crew. This legislative instrument was enacted to address the critical issue of ensuring the airworthiness of aircraft by mandating specific safety measures and compliance requirements. The policy objective is to maintain high safety standards by requiring compliance with airworthiness directives that mitigate risks associated with identified faults or hazards. The authority to enact and amend these regulations lies with the Parliament of the Commonwealth of Australia. The legislative instrument in question, particularly the airworthiness directive AD/S-76/30 Amendment 1, was introduced to address a specific issue with the Sikorsky S-76 Series Helicopters, specifically targeting the problem of tail rotor blade displacement. This amendment was introduced following an incident where a tail rotor blade was displaced due to disbonding of the aluminium elliptical spar plug, leading to severe vibration during a flight. The amendment withdraws a repetitive inspection requirement after finding no further reports of failure following compliance with the Service Bulletin, thereby enhancing safety measures without imposing unnecessary repetitive inspections.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105 concerning the Civil Aviation Safety Authority's Schedule of Airworthiness Directives, applies to operators of the Sikorsky S-76 Series helicopters, including the S76A model. This regulation mandates that operators must adhere to the requirements set out in Sikorsky Service Bulletin 76-65-35 Revision A, which addresses the issue of the tail rotor blade elliptical centering plug and retaining pad. The directive is applicable regardless of the geographic location within Australia, as it is enforced by the Commonwealth of Australia through the Civil Aviation Safety Authority. The regulation stipulates that the specified action must be taken within 25 hours of time in service after 13 October 1994, unless the required action has already been completed. The regulation's applicability is not restricted by any jurisdictional boundaries within Australia and applies uniformly across all states and territories. There are no exclusions or exemptions noted within the directive itself, but compliance is strictly enforced to ensure airworthiness and safety.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, which pertains to the Civil Aviation Safety Authority's Schedule of Airworthiness Directives, includes a directive concerning the Sikorsky S-76 Series Helicopters (sections 39.105(1) and (2)). This directive, identified as AD/S-76/30 Amendment 1, focuses on the tail rotor blade elliptical centering plug and retaining pad. According to section 39.105(3), operators must ensure that actions are taken in accordance with Sikorsky Service Bulletin 76-65-35 Rev A, and it references FAA AD 94-14-20, which supersedes FAA AD 84-06-02. The directive was initially issued on 27 February 1984 and requires compliance within 25 hours of time in service after 13 October 1994, unless the required action has already been accomplished. This directive imposes specific obligations on helicopter operators, mandating that they adhere to the instructions provided in the referenced Service Bulletin. Section 39.105(4) stipulates that the action must be completed within the specified timeframe to maintain the airworthiness of the aircraft. Operators must ensure that the tail rotor blade elliptical centering plug and retaining pad are inspected and modified as necessary to prevent disbonding and radial displacement of the tail rotor blade, which could lead to severe vibration during flight. Failure to comply with the requirements outlined in AD/S-76/30 Amendment 1 can result in serious consequences. Section 39.105(5) highlights that non-compliance may lead to violations of the Civil Aviation Regulations, potentially resulting in enforcement actions by the Civil Aviation Safety Authority. Although the specific penalties are not detailed in the provided text, non-compliance with airworthiness directives can generally result in civil or criminal penalties, including fines and potential imprisonment, depending on the severity of the violation. The exact penalties would be determined based on the specific regulatory framework and the circumstances of the non-compliance.