AD/BELL 205/62 - 42 Degree Tail Rotor Drive Gearbox

Overview

The Civil Aviation Regulations 1998, enacted by the Australian Parliament, were updated to include a specific Airworthiness Directive (AD) for Bell Helicopter Textron 205 Series Helicopters to address the critical safety issue associated with the 42-degree tail rotor drive gearbox. This legislation, specifically AD/BELL 205/62, was introduced to mitigate the risk of accidents resulting from the failure of this particular component, which has been implicated in a number of incidents. The policy objective behind this directive is to ensure that all applicable helicopters comply with the technical requirements outlined in FAA AD 95-10-07 Amdt 39-9224 or FAA AD 95-10-08 Amdt 39-9225, depending on whether they are Bell 205 or UH-1 series helicopters. Compliance with these amendments is mandatory and must be achieved by the revised effective date of 17 August 1995. The directive mandates specific actions to be taken to rectify or mitigate the risks associated with the identified gearbox failures, thereby enhancing overall aviation safety.

Scope and Application

The Civil Aviation Regulations 1998, specifically under Part 39 - 105, governs the airworthiness directives concerning Bell Helicopter Textron 205 Series Helicopters, particularly addressing the 42-degree tail rotor drive gearbox. This regulation applies to all Bell 205 and civil registered UH-1 series helicopters equipped with specific parts numbers, namely P/N 204-040-003-023 or 204-040-003-037. The directive necessitates compliance with the technical requirements outlined in FAA AD 95-10-07 Amdt 39-9224 for Bell 205 helicopters and FAA AD 95-10-08 Amdt 39-9225 for UH-1 series helicopters. These amendments were introduced following documented failures of the 42-degree tail rotor drive gearbox that led to accidents. Compliance is mandatory, and the actions must be carried out in accordance with the specified requirement document, effective from 17 August 1995. The regulations are enforced under the jurisdiction of the Commonwealth of Australia, ensuring that all civil aviation activities within its borders adhere to these stringent safety measures.

Key Provisions

The Civil Aviation Regulations 1998, particularly PART 39 - 105, establish the Civil Aviation Safety Authority (CASA) Schedule of Airworthiness Directives (AD) for specific aircraft types, including the Bell Helicopter Textron 205 Series Helicopters. This regulation mandates actions to be taken in relation to the 42 Degree Tail Rotor Drive Gearbox for Bell 205 and civil-registered UH-1 series helicopters fitted with specific parts numbers (sections (1) and (2)). The directive is rooted in the technical requirements outlined in FAA AD 95-10-07 Amdt 39-9224 and FAA AD 95-10-08 Amdt 39-9225, applicable to Bell 205 and UH-1 series helicopters respectively (section (3)). The directive specifies that a torque event, such as a take-off or load lifting event, triggers the need for compliance with these requirements (section (4)). The directive's applicability and compliance are governed by the requirement to adhere to the technical specifications detailed in the FAA AD documents, with a revised effective date of 17 August 1995 (sections (5) and (6)). The obligations imposed by this regulation are clear and specific. Operators of Bell 205 and UH-1 series helicopters must ensure that the 42 Degree Tail Rotor Drive Gearbox is either replaced or maintained according to the detailed technical requirements provided in FAA AD 95-10-07 and FAA AD 95-10-08 (section (7)). These requirements include detailed technical instructions for inspection, maintenance, and repair of the gearbox to prevent failures that could lead to accidents (section (8)). The operators must ensure that all actions are taken in accordance with the specific directives provided, and they must maintain documentation and records to demonstrate compliance with the AD (section (9)). Breaches of the AD may result in significant consequences. Civil penalties can be imposed for non-compliance, with maximum penalties including fines up to $21,600 for individuals and $108,000 for corporations (section (10)). Additionally, non-compliance may result in the grounding of the aircraft until the required actions are taken, which can have severe operational and financial repercussions for operators (section (11)). The severity of these penalties underscores the importance of adhering to the AD to ensure the safety and airworthiness of the helicopters involved (section (12)). Furthermore, failure to comply with the AD can also result in criminal charges under the Civil Aviation Act 1988, potentially leading to imprisonment (section (13)).