AD/AC/1 - Wing Rib - Reinforcement

Overview

The Civil Aviation Regulations 1998, enacted by the Parliament of the Commonwealth of Australia, serve to regulate and oversee the safe and efficient operation of civil aviation within Australia. Within this extensive framework, Part 39 specifically addresses airworthiness directives, which are legally binding orders that compel aircraft owners or operators to maintain their aircraft in an airworthy condition. One such directive, AD/AC/1, pertains to the reinforcement of wing ribs in the Twin Commander series aeroplanes (Gulfstream/Rockwell/Aerocommander 500, 600, and 700). This directive was introduced to address specific safety concerns identified in certain serial numbers of model 520, namely S/Nos. 520-81 to 520-86 plus -89 and -92, to ensure the structural integrity of these aircraft and thereby enhance flight safety. Compliance with this directive is mandated to be carried out forthwith, as specified in Aero Commander Service Bulletin No. 20.

Scope and Application

The Civil Aviation Safety Authority (CASA) Schedule of Airworthiness Directives, specifically Part 39 - 105, pertains to the Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes and mandates compliance with AD/AC/1 concerning wing rib reinforcement. This legislation applies to aircraft manufacturers, operators, and owners of the specified Twin Commander models, namely Model 520 with serial numbers 520-81 to 520-86, plus -89 and -92. The directive necessitates immediate action to reinforce the wing ribs to ensure airworthiness, as outlined in Aero Commander Service Bulletin No. 20. This regulation is issued under the authority of the Civil Aviation Regulations 1998, and its jurisdictional reach is national, applying across the Commonwealth of Australia. The directive does not specify exclusions, exemptions, or thresholds within the text, but it may be subject to further clarification or extension through subordinate instruments issued by CASA.

Key Provisions

The Civil Aviation Regulations 1998, particularly Part 39 - 105, specify a range of requirements for maintaining the airworthiness of certain aircraft models, including the Twin Commander (Gulfstream/Rockwell/Aerocommander 500, 600, and 700) series aeroplanes. Section 39.105(1) mandates that specific models within this series, namely the Model 520 with serial numbers 520-81 to 520-86 plus -89 and -92, must comply with a specific Airworthiness Directive (AD) regarding wing rib reinforcement. The directive requires these aircraft to be strengthened forthwith, in accordance with the guidance provided in Aero Commander Service Bulletin No. 20 (AD/AC/1). This legislation imposes clear obligations on aircraft operators and owners to ensure that the specified aircraft undergo the required wing rib reinforcement. Compliance with these directives is mandatory and must be achieved without undue delay. This includes following the precise instructions detailed in the referenced service bulletin, which provides technical specifications and procedures to be adhered to during the reinforcement process. Failure to comply with these directives can lead to serious consequences, as the safety of the aircraft and its passengers is paramount. The Civil Aviation Regulations also establish the legal framework for potential breaches of these airworthiness directives. Section 39.105(2) outlines the potential civil and criminal consequences for non-compliance. Specifically, failure to adhere to the required airworthiness directives can result in severe penalties. Civil penalties may include fines, and in more serious cases, criminal penalties could apply, potentially leading to imprisonment for the responsible individuals or entities. The exact penalties depend on the severity and intent behind the non-compliance, but the regulations are clear that safety violations will not be tolerated. In summary, the Civil Aviation Regulations 1998 mandate stringent requirements for the airworthiness of certain aircraft models, with specific directives on wing rib reinforcement for the Twin Commander series aeroplanes. Operators and owners must comply without delay, following the detailed instructions in the relevant service bulletin. Non-compliance carries significant consequences, including civil and criminal penalties, underscoring the critical importance of adhering to these safety directives.