AD/BEECH 36/40 - Elevator Trim Tab Actuator

Overview

The Civil Aviation Regulations 1998, under the authority of the Civil Aviation Act 1988, were enacted to ensure the safety and efficiency of civil aviation in Australia. This particular legislative instrument, AD/BEECH 36/40, pertains to the Beechcraft 36 (Bonanza) series aeroplanes and was introduced to address the critical safety issue of elevator trim tab actuators being interchanged, which could lead to catastrophic outcomes. This directive was issued following the occurrence of two fatal accidents where the trim tab actuators were reversed post-maintenance, leading to a loss of control over the aircraft. The policy objective is to mandate specific corrective actions to prevent such interchanges, as outlined in Beechcraft Service Bulletin 2399, and to require compliance at the next scheduled inspection to ensure ongoing airworthiness and safety. The enactment of this legislation by the Civil Aviation Safety Authority aims to mitigate the risk of fatal accidents by enforcing adherence to the specified service bulletin and actions. The requirement for compliance at the next scheduled inspection is crucial to maintaining the safety standards and ensuring that all Beechcraft 36 (Bonanza) series aeroplanes remain airworthy. The directive references FAA AD 91-17-01 Amdt 39-7099, reflecting a coordinated effort between Australian and international aviation authorities to address this safety concern comprehensively.

Scope and Application

The Civil Aviation Safety Authority (CASA) Regulations 1998, specifically Part 39 - 105, address the airworthiness of Beechcraft 36 (Bonanza) series aeroplanes through the Airworthiness Directive AD/BEECH 36/40 concerning the elevator trim tab actuator. This directive applies to the models and serial numbers specified in Beechcraft Service Bulletin 2399 and mandates compliance with the actions outlined in that bulletin to prevent the interchange of right-hand and left-hand trim tab actuators, which has been linked to fatal accidents. The directive requires adherence to the mandatory actions as specified by Beechcraft Service Bulletin 2399, which is also referenced in FAA AD 91-17-01 Amendment 39-7099. Compliance with these requirements must be achieved at the next scheduled inspection for Maintenance Release issue following 29 February 1992, ensuring the safety of the aircraft and its occupants by preventing potential loss of control due to incorrect actuator installation.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, addresses airworthiness directives for various aircraft models, including the Beechcraft 36 (Bonanza) series aeroplanes. Section AD/BEECH 36/40 focuses on the elevator trim tab actuator, referencing Beechcraft Service Bulletin 2399 (section 2). This directive applies to models and serial numbers as listed in the service bulletin (section 3). The primary requirement is to take action in accordance with the specified service bulletin (section 4). This action is mandatory and must be carried out as detailed in FAA AD 91-17-01 Amendment 39-7099 (section 5). The obligations imposed by this directive require the aircraft owner or operator to comply with the actions stipulated in the Beechcraft Service Bulletin 2399. This includes ensuring that the elevator trim tab actuators are correctly installed and not interchanged, as this could lead to significant safety hazards. The directive mandates compliance at the next scheduled inspection for Maintenance Release issue following 29 February 1992 (section 6). The aim of this requirement is to mitigate the risk of accidents that could result from the reversal of the trim tab actuators, as evidenced by two fatal accidents reported under similar circumstances (section 7). Failure to comply with this directive may result in serious consequences, as the reversal of the elevator trim tab actuators has been directly linked to loss of control and fatal accidents. The potential civil and criminal penalties for non-compliance are severe and may include fines or imprisonment, depending on the severity of the breach and the resultant harm. Although the specific maximum penalties are not detailed in the provided text, non-compliance with airworthiness directives generally carries significant legal repercussions, including potential suspension or revocation of the aircraft’s certificate of airworthiness (section 8). In summary, the directive under the Civil Aviation Regulations 1998 mandates specific actions to prevent the interchange of the elevator trim tab actuators on Beechcraft 36 (Bonanza) series aeroplanes. This is to ensure that these components are correctly installed, thereby preventing potential loss of control and ensuring the safety of the aircraft. Non-compliance with these provisions could result in severe civil or criminal penalties, underscoring the critical importance of adhering to the specified airworthiness directives.