AD/AC/81 Amdt 1 - Elevator Trim Tab

Overview

The Civil Aviation Regulations 1998, which were enacted by the Parliament of Australia, form a comprehensive framework to regulate civil aviation within Australia. One aspect of these regulations is the issue of Airworthiness Directives (ADs) to ensure the safety of aircraft operations. Specifically, AD/AC/81Amdt 1 pertains to the elevator trim tab of Twin Commander (Gulfstream/Rockwell/Aerocommander 500, 600 and 700) Series Aeroplanes, addressing a specific safety concern identified in Gulfstream Aerospace Service Bulletin No. 198A. This amendment extends the applicability of the service bulletin to additional aircraft serial numbers, aiming to ensure that all affected aircraft meet necessary safety standards. The policy objective is to maintain and enhance the safety of air travel by mandating specific maintenance and modification procedures for identified aircraft models. The Civil Aviation Safety Authority, acting under the authority of the Civil Aviation Regulations 1998, introduced this amendment to address potential safety risks associated with the elevator trim tab of the specified aircraft models. By requiring compliance with Gulfstream Aerospace Service Bulletin No. 198A, the AD ensures that affected aircraft are subject to timely inspections and necessary modifications to prevent any potential safety issues. This directive is part of a broader regulatory effort to ensure that all civil aircraft operating within Australia adhere to the highest safety standards, thereby protecting passengers, crew, and the general public.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, applies to all Twin Commander (Gulfstream/Rockwell/Aerocommander 500, 600, and 700) series aeroplanes, which must adhere to the specified airworthiness directives. These directives are essential to ensure the safe operation of these aircraft models and are enforced by the Civil Aviation Safety Authority (CASA). The scope of these regulations encompasses all operators and entities involved in the maintenance and operation of the mentioned aircraft, ensuring compliance with safety standards set by the authority. The geographic reach of these regulations is national, applying across all states and territories of Australia, as they pertain to the registration and operation of aircraft within the Commonwealth of Australia. There are no stated exclusions or exemptions within the scope of this directive; all applicable aircraft must comply with the outlined requirements. Any further specifications or extensions to the application of these regulations are made through subordinate instruments issued by CASA, ensuring that the directives remain relevant and effective in maintaining air safety standards.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, address the airworthiness of certain aircraft types, with the current focus on the Twin Commander (Gulfstream/Rockwell/Aerocommander 500, 600, and 700) series aeroplanes. This part includes an amendment to an Airworthiness Directive concerning the elevator trim tab (AD/AC/81Amdt 1). The directive, which applies to all models listed in Gulfstream Aerospace Service Bulletin No. 198A, mandates compliance with the requirements set out in Part 1 and Part 2 of the bulletin. Part 1 of the directive requires compliance within 25 hours of time in service following 2 September 1985, and then at intervals not exceeding 100 hours’ time in service, or at each scheduled inspection for Maintenance Release issue, until the aircraft are modified as per Part 2 of the requirement document. Aircraft that have already been modified in accordance with Part 2 of Service Bulletin No. 198 are exempt from further action under this directive. This regulatory provision ensures that all Twin Commander series aeroplanes maintain a specific level of airworthiness concerning the elevator trim tab functionality. The obligations imposed by this directive are clear and specific. Operators of the affected aircraft must ensure that the elevator trim tab is checked and modified if necessary, adhering to the timelines and conditions specified in the Service Bulletin No. 198A. This includes maintaining records of compliance and inspections, which are critical for regulatory oversight and safety audits. The directive also places the responsibility on the operator to ensure that the aircraft meet the necessary airworthiness standards to avoid any potential safety risks associated with the elevator trim tab. Breaching the provisions of this directive can lead to serious consequences. While the specific penalties are not detailed in the excerpt, non-compliance with Civil Aviation Regulations can generally result in enforcement actions, including fines, suspension of airworthiness certificates, and potential grounding of the aircraft. Such breaches can also lead to civil or criminal liability for the operators, particularly if the non-compliance is found to contribute to an aviation incident or accident. Ensuring adherence to the requirements is therefore critical to avoid these adverse outcomes and maintain the safety and legality of operations.