AD/DAUPHIN/44 - Tail Rotor Hub Fairing

Overview

The Civil Aviation Regulations 1998, enacted by the Australian Parliament, provide comprehensive regulations for ensuring the safety and efficiency of civil aviation within Australia. Specifically, Part 39 of these regulations includes the 105 Civil Aviation Safety Authority Schedule of Airworthiness Directives, which are essential in maintaining the airworthiness of aircraft in service. The Airworthiness Directive AD/DAUPHIN/44, issued on 9th July 1995, pertains to the Eurocopter SA 360 and SA 365 (Dauphin) series helicopters, addressing an urgent safety concern identified by both the Direction Générale de l'Aviation Civile (DGAC) and Eurocopter. The directive was introduced to mitigate the risk posed by reported instances of ruptured springs in the tail rotor hub fairing, which both regulatory authorities and the manufacturer considered a significant airworthiness issue. The policy objective is to ensure that such safety-critical components are maintained and operated within specified parameters to prevent potential in-service failures. The directive mandates that operators of the specified Dauphin helicopter models (SA 365C, C1, C2, and C3, and 365N) must comply with Eurocopter’s telex service communications No. 01.34 or 01.43, as applicable. The compliance requirement stipulates that any action necessary to address the issue must be completed before further flights are undertaken post-7th July 1995, with ongoing compliance to be maintained in accordance with the specified Requirement Document. This directive underscores the importance of timely and effective safety measures in aviation to protect both the aircraft and those on board.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, mandates the application of Airworthiness Directives to ensure the safety of aircraft within Australian airspace. This particular directive applies to all Eurocopter SA 360 and SA 365 (Dauphin) Series Helicopters, namely models SA 365C, C1, C2, and C3, as well as the 365N. The directive requires compliance with Eurocopter Telex Service No. 01.34 or 01.43, as applicable, and references the French DGAC Airworthiness Directives 95-112-040(B) and 95-107-039(B) R1. The action must be taken prior to further flight after 7 July 1995 and subsequently in accordance with the specified Requirement Document. The directive arises from reports of in-service issues with ruptured springs, which both the DGAC and Eurocopter have identified as an urgent airworthiness concern. The regulations extend to any entity operating these specific helicopter models within Australia, ensuring that safety measures are uniformly implemented across the country.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39, Section 105, establish the authority for the Civil Aviation Safety Authority to issue Airworthiness Directives (ADs). One such AD is AD/DAUPHIN/44, which pertains to the Eurocopter SA 360 and SA 365 (Dauphin) Series Helicopters. This particular AD addresses the tail rotor hub fairing, applicable to models SA 365C, C1, C2, C3, and 365N. The directive mandates that actions be taken in accordance with Eurocopter Telex Service No. 01.34 or 01.43 as applicable (Section 105). Furthermore, it references DGAC ADs 95-112-040(B) and 95-107-039(B) R1. Compliance with this AD is mandatory, requiring action to be taken prior to further flight after 7 July 1995, and subsequently in line with the requirements outlined in the Requirement Document. Compliance with AD/DAUPHIN/44 entails that helicopter operators must ensure the tail rotor hub fairing is inspected and, if necessary, repaired or replaced in line with the specified Eurocopter telex service instructions. This is a critical requirement as it directly addresses a reported in-service issue of ruptured springs, which both the French Civil Aviation Authority (DGAC) and Eurocopter have identified as an urgent airworthiness concern. Operators must therefore schedule the necessary inspections and repairs promptly and adhere to the compliance timeline set by the AD. Failure to comply with the provisions of AD/DAUPHIN/44 can lead to severe consequences. Non-compliance may result in the aircraft being deemed unairworthy, which could prevent it from operating. This, in turn, may lead to enforcement actions by the Civil Aviation Safety Authority, including the issuance of penalties. The severity of penalties can vary, but they may include fines and other civil or administrative measures. Additionally, if non-compliance with the AD leads to an accident or incident, it could result in more severe criminal penalties, including imprisonment, depending on the circumstances and the extent of the breach.