AD/S-76/31 Amdt 1 - Upper Fuselage Station 215 Bulkhead

Overview

The Civil Aviation Regulations 1998, as amended by the Legislative Instrument F2006B06714, addresses the critical issue of safety in the operation of Sikorsky S-76 Series Helicopters, particularly focusing on structural integrity. This regulatory framework was introduced to ensure that all operators adhere to stringent safety standards, minimising the risk of in-service failures and enhancing overall aviation safety. The legislation was enacted by the Australian Parliament to mandate the inspection and modification of the upper fuselage station 215 bulkhead in Sikorsky S-76 helicopters that have exceeded 1000 hours of service time, unless they have been equipped with specific structural modifications. The primary policy objective is to prevent structural failures by ensuring that identified vulnerabilities are addressed through timely inspections and necessary modifications, thereby safeguarding the integrity of air travel and the safety of all those on board.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, governs the airworthiness directives for various aircraft, including the Sikorsky S-76 Series Helicopters, as outlined in AD/S-76/31 Amendment 1. This regulation applies to all models of the Sikorsky S-76 Series that have surpassed 1000 hours of time in service and have not incorporated structural modification kits in accordance with Sikorsky Customer Service Notice No. 76-150 or an equivalent manufacturer-installed modification. The geographic and jurisdictional reach of this legislation extends across the Commonwealth of Australia, ensuring that all operators within its territory adhere to the prescribed safety directives. The regulation mandates inspections and modifications to the upper fuselage Station 215 bulkhead to address the identified risk of cracks. Compliance with this directive involves inspecting the bulkhead at intervals not exceeding 50 hours of time in service until the modification is completed, followed by inspections at intervals not exceeding 100 hours of time in service after the modification. Modifications must be carried out within 500 hours of time in service following the directive's issuance on 30 September 1985, with one modification option constituting terminating action.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39, include an Airworthiness Directive (AD) AD/S-76/31 Amendment 1 which pertains to Sikorsky S-76 Series Helicopters, focusing on the upper fuselage Station 215 bulkhead. The directive applies to all models that have not incorporated structural modification kits in accordance with Sikorsky Customer Service Notice No. 76-150 or a manufacturer-installed equivalent, and have achieved more than 1000 hours of time in service (155). The primary requirement outlined in this directive is for an inspection of the specified bulkhead, to be conducted in accordance with Sikorsky Alert Service Bulletin 76-53-18, followed by a modification as specified in either Sikorsky Alert Service Bulletin 76-53-26, Sikorsky Customer Service Notice No. 76-151, or Sikorsky Customer Service Notice No. 76-150. It is noted that modification in accordance with CSN 76-150 constitutes the terminating action for this AD (166). The AD imposes several obligations on the parties and entities governed by it. Primarily, it requires operators to ensure that inspections are conducted at intervals not exceeding 50 hours of time in service until the helicopter is modified in accordance with the directive. After the modification, inspections must be conducted at intervals not exceeding 100 hours of time in service, unless the terminating action has been completed as per Sikorsky CSN No. 76-150. Furthermore, the modification itself must be carried out within the next 500 hours of time in service following 30 September 1985. These requirements are critical to maintaining the airworthiness and safety of the Sikorsky S-76 Series helicopters by addressing the identified issue of cracks in the Station 215 bulkhead installation in the upper fuselage section, left side. Failure to comply with the provisions of this AD can lead to significant consequences. While the regulations do not explicitly detail specific offences, penalties, or civil/criminal consequences, non-compliance with airworthiness directives generally can result in severe repercussions under the Civil Aviation Act 1988 and the Civil Aviation Regulations 1998. Such repercussions may include fines, suspension or revocation of airworthiness certificates, and potential criminal charges if the non-compliance leads to an aviation accident or incident. The exact penalties would be determined in the context of broader aviation safety laws and any relevant administrative or judicial processes.