Overview

The Bell Helicopter Textron 205 Series Helicopters Airworthiness Directive, issued by the Civil Aviation Safety Authority (CASA) in 2001, was introduced in response to an incident where an in-flight loss of a tail rotor counterweight bellcrank occurred due to a failure of the retention nut. This failure could have led to the bellcrank migrating off the crosshead spindle, resulting in a loss of tail rotor control and ultimately the loss of control of the helicopter. The policy objective of this Airworthiness Directive was to ensure the airworthiness and safety of the specified helicopter models by mandating the replacement and inspection of the retention nuts and corrosion preventive compound coating to prevent further incidents of this nature. The directive requires compliance within specified time frames and conditions to mitigate the identified safety risk.

Scope and Application

This Airworthiness Directive applies specifically to Model 205A-1 and 205B Bell Helicopter Textron series helicopters. It mandates that operators and owners of these aircraft must replace the existing retention nuts of the tail rotor counterweight bellcranks and ensure that any corrosion preventive compound coating is intact and properly applied. The directive applies within the Commonwealth of Australia, overseen by the Civil Aviation Safety Authority (CASA). The requirement stipulates that the specified actions must be undertaken within a set timeframe post the directive's effective date or after the aircraft reaches a certain number of flight hours, whichever comes first. It also includes regular inspections and maintenance checks to be performed at intervals not exceeding 100 hours of service post the initial compliance. This AD does not exempt any specific entities or aircraft from its requirements unless they have already fulfilled the mandated actions. The scope of this directive can be extended or further clarified through subordinate instruments issued by CASA.

Key Provisions

The Bell Helicopter Textron 205 Series Helicopters Airworthiness Directive (AD) issued by the Civil Aviation Safety Authority (CASA) outlines specific actions to address safety concerns related to the tail rotor counterweight bellcrank retention nuts. This AD applies to Model 205A-1 and 205B helicopters. Under section 1, 205A-1 helicopters require the removal of existing retention nuts and installation of zero time retention nuts, in accordance with the instructions provided in Bell Helicopter Textron Alert Service Bulletin (ASB) 205-00-77 Revision A. This action must be completed within 100 hours of service or 90 days after 1 August 2001, whichever is sooner, unless the action has already been completed. Additionally, inspections of the retention nuts and corrosion preventive compound (CPC) coating must be carried out and any deficiencies rectified in accordance with the ASB instructions. For 205B helicopters, the directive mandates the removal of existing retention nuts and installation of new ones, also following the instructions in ASB 205B-00-31 Revision A. The same inspection and corrective measures for the CPC coating apply here as well. This AD imposes specific obligations on the operators and owners of the affected helicopters. Operators must ensure that the specified actions are carried out within the stipulated timeframes. This involves not only the physical replacement of the retention nuts but also ensuring that any inspections and necessary repairs to the CPC coating are performed according to the detailed instructions provided in the referenced service bulletins. Furthermore, operators must maintain records of these actions and inspections to demonstrate compliance with the AD. Failure to adhere to these requirements could result in the aircraft being deemed unairworthy. Non-compliance with the provisions of this Airworthiness Directive can lead to serious consequences. Under the Civil Aviation Regulations 1998, failure to comply with an AD can result in civil penalties. Specifically, the maximum penalty for an individual who contravenes an AD can be up to $16,200 for a serious breach, which is a high level of culpability. For a corporation, the maximum penalty can be up to $81,000. Additionally, non-compliance can lead to the grounding of the aircraft, which would prevent it from being operated until the required actions are completed. In extreme cases, failure to comply with ADs can also lead to criminal charges, especially if the non-compliance results in a safety incident or accident.