AD/BEECH 99/3 - Wing Attach Fittings, Bolts and Nuts

Overview

The Civil Aviation Regulations 1998, which were enacted by the Parliament of the Commonwealth of Australia, govern civil aviation safety across the country. Part 39, specifically focusing on airworthiness directives, addresses the safety concerns and operational standards for aircraft. One such directive, AD/BEECH 99/3, targets the Beechcraft 99 Series Aeroplanes, addressing the critical issue of wing attach fittings, bolts, and nuts. This directive was introduced to rectify the identified problem of material fatigue and structural integrity in the wing attachments of certain Beechcraft 99 series aircraft, ensuring compliance with safety standards and minimising risk to flight operations. The policy objective is to enhance the overall safety and reliability of the aircraft by mandating the replacement and inspection of specified components. Enacted under the authority of the Civil Aviation Act 1988, these regulations are essential in maintaining high safety standards in the aviation sector. The specific directive for Beechcraft 99 series aeroplanes aims to ensure that critical safety components, such as wing attach fittings, are replaced or inspected at regular intervals to prevent potential failures that could compromise flight safety. By doing so, the directive aligns with the overarching goal of the Civil Aviation Regulations to safeguard the public and maintain the integrity of the national airspace.

Scope and Application

The Civil Aviation Safety Authority (CASA) has issued an Airworthiness Directive (AD) under the Civil Aviation Regulations 1998, specifically targeting the Beechcraft 99 series aeroplanes. This legislation applies to all model 99, 99A, A99A, B99 and C99 aircraft, and it mandates the replacement of specific components to ensure airworthiness and safety. For serial numbers U-1 to U-179, U-181 to U-184, U-186 to U-192, and U-194 to U-196, operators are required to replace the steel outboard wing attach bolts and nuts with inconel bolts and nuts in accordance with specified Beechcraft Service Instructions. Additionally, operators must inspect the inconel bolts and nuts at intervals not exceeding five years, and replace them at intervals not exceeding fifteen years. This directive is crucial for ensuring the ongoing safety and compliance of these aircraft with civil aviation standards within Australia.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, contain a Schedule of Airworthiness Directives that governs the safety of aircraft, including the Beechcraft 99 series aeroplanes. One such directive, AD/BEECH 99/3, concerns the wing attach fittings, bolts and nuts, which are critical for the safety of flight (Section 1). This directive applies to all model 99, 99A, A99A, B99, and C99 aircraft with certain serial numbers (Section 2). Under this directive, the main requirements are detailed in the AD. Firstly, for specified serial numbers, steel outboard wing attach bolts and nuts must be replaced with inconel bolts and nuts in accordance with Beechcraft Service Instruction 1235 (Section 3(1)). Additionally, all inconel outboard wing attach bolts and nuts must be inspected according to the Beechcraft Structural Inspection and Repair Manual 98-39006A4, Section 57-15-00, pages 214-227 (Section 3(2)). Finally, any inconel bolts and nuts that have reached their time limit must be replaced (Section 3(3)). The obligations imposed by this directive are clear and must be adhered to by all relevant parties. Aircraft operators must ensure that steel bolts and nuts are replaced before further flight after 27 September 1995 (Section 4(1)). The inconel bolts and nuts must be inspected at intervals not exceeding 5 years of component time in service (Section 4(2)). Similarly, any time-expired inconel bolts and nuts must be replaced at intervals not exceeding 15 years of component time in service (Section 4(3)). Failure to comply with these provisions can result in serious consequences. Although the specific offences, penalties, or civil/criminal consequences are not detailed in the provided text, it is clear that adherence to these safety directives is mandatory. Non-compliance with airworthiness directives can typically lead to enforcement actions, which may include fines, aircraft grounding, or other regulatory penalties as prescribed by the Civil Aviation Safety Authority. The exact penalties would depend on the nature and severity of the non-compliance, as well as any relevant case law or regulatory guidance.