Overview

The Civil Aviation Safety Regulations 1998, specifically Part 39 - 105, establishes the framework under which Airworthiness Directives (AD) are issued by the Civil Aviation Safety Authority (CASA). This legislative instrument was enacted to ensure that civil aviation operations in Australia are conducted safely by setting and enforcing airworthiness standards. The ADs are critical tools in addressing identified safety issues by mandating corrective actions for specific aircraft or aeronautical products. The policy objective behind these regulations is to mitigate risks and enhance the safety of civil aviation through proactive and reactive measures. This particular AD, AD/GAZELLE/26, pertains to the Eurocopter SA341 and SA342 (Gazelle) Series Helicopters, addressing an identified unsafe condition concerning the flexible disks of the tail rotor drive shafts. The directive was issued on 14 November 2003, in response to reports of jo-bolt washers being incorrectly installed, which could lead to cracking of the flexible disc and loss of tail rotor drive. The directive requires specific inspections and corrective actions to be undertaken by the relevant operators within specified timeframes, thereby ensuring compliance and safety in operation. The directive was notified in the Commonwealth of Australia Gazette on 3 December 2003, and became effective on 25 December 2003.

Scope and Application

This legislative instrument, the Civil Aviation Safety Regulations 1998, specifically Part 39 - 105, applies to Eurocopter SA341 and SA342 (Gazelle) series helicopters that are registered in Australia and operated by entities subject to the oversight of the Civil Aviation Safety Authority (CASA). The directive mandates particular safety measures concerning the flexible discs of tail rotor drive shafts, thereby directly impacting the aviation industry, particularly operators of the specified helicopter models. This regulation is a Commonwealth instrument, thus its jurisdiction extends nationally across all states and territories within Australia. The directive mandates specific actions to be taken to address safety concerns related to the assembly of jo-bolt washers in the tail rotor drive shafts, including inspections, corrective measures, and replacement of faulty components, as outlined in the requirement and compliance sections of the directive. Notably, the directive does not specify any exclusions, exemptions, or thresholds; instead, it applies uniformly to the specified aircraft types. The directive’s application can be further extended or detailed through subordinate instruments as necessary to maintain safety standards in aviation.

Key Provisions

The Civil Aviation Safety Regulations 1998 (CASR), specifically under Part 39 - 105, include an Airworthiness Directive (AD) issued by a delegate of the Civil Aviation Safety Authority (CASA). This directive, identified as AD/GAZELLE/26, pertains to the Eurocopter SA341 and SA342 (Gazelle) Series Helicopters, and it was issued on 13/2003. The directive is applicable to SA 341 G and SA 342 J helicopters and is designed to address an identified unsafe condition involving the tail rotor drive shafts' flexible discs. The key provisions of this AD (sections 1-3) require the inspection, repetitive inspection, and replacement of the flexible disc assemblies in the tail rotor drive shafts. Section 1 of the requirement mandates the inspection of the flexible discs in both the inclined and horizontal tail rotor drive shafts to ensure the correct installation of the disc jo-bolt washers, as specified in Eurocopter Alert Telex Number 65.63. Section 2 requires repetitive inspections of any flexible disc assemblies found to have jo-bolt washers incorrectly assembled, while Section 3 necessitates the replacement of such assemblies. The directive becomes effective on 25 December 2003 and was issued in response to a report of the tail rotor drive shaft flexible disc jo-bolt washers being installed incorrectly, which could lead to cracking of the flexible discs and loss of tail rotor drive. Operators and owners of the affected helicopters must comply with the AD by inspecting the flexible discs within 10 hours of the directive's effective date, conducting repetitive inspections at intervals not exceeding 10 hours of time in service, and replacing any incorrectly assembled flexible disc assemblies by 1 May 2004. Failure to comply with these requirements may result in safety hazards and potential regulatory consequences. The AD aims to mitigate risks by ensuring the correct assembly and functioning of the tail rotor drive shaft flexible discs, which is critical for the safe operation of the helicopters. The AD does not explicitly state specific offences, penalties, or civil/criminal consequences for non-compliance; however, it is understood that non-compliance with ADs under the CASR could lead to enforcement actions by CASA. Such actions may include fines, legal proceedings, or other regulatory measures to ensure compliance with aviation safety standards. Non-compliance with ADs can result in significant safety risks, including potential loss of aircraft control, which could lead to severe accidents or incidents. Therefore, operators must adhere to the requirements set forth in the AD to maintain airworthiness and ensure the safety of flight operations.