Overview

The Civil Aviation Safety Authority (CASA) introduced the Civil Aviation Orders (CAO) in 1998 to consolidate and modernise Australia's civil aviation safety regulations, addressing the need for a more streamlined and comprehensive legislative framework to ensure the safety of civil aviation. This legislative instrument, enacted by the Australian Parliament, aims to provide a cohesive and efficient regulatory system that ensures the highest standards of safety and efficiency in civil aviation operations. The CAO is designed to address gaps and inefficiencies in previous legislation by providing clear, accessible, and enforceable regulations that are consistent with international standards. The overarching policy objective of the CAO is to enhance the safety and efficiency of civil aviation in Australia through a robust regulatory framework that promotes high safety standards and compliance with international best practices.

Scope and Application

The Civil Aviation Orders, specifically Part 105 Schedule of Airworthiness Directives, governs the inspection and retirement requirements for engine mounts of the Gulfstream (Grumman) G.159 series aeroplanes, applying to all models within the series. This legislative instrument is issued by the Civil Aviation Safety Authority, which has the jurisdictional reach to enforce these regulations across the Commonwealth of Australia. The directive mandates radiographic inspections of the forward and aft engine mount tubes to detect localised corrosion, with specific instructions on the orientation of the X-Ray beam. Corrosion pits are acceptable if they meet certain criteria, but any corrosion detected must be recorded and assessed. The directive also specifies intervals for inspections and retirement of engine mount assemblies based on the number of landings and detected corrosion, with previous inspections under earlier directives potentially satisfying current requirements. The directive extends its application through the detailed instructions on inspection and retirement processes, ensuring adherence to the safety standards set by the Civil Aviation Safety Authority.

Key Provisions

The main operative sections of this legislation (AD/G159/41) concern the inspection and retirement of engine mount tubes for the Gulfstream (Grumman) G.159 series aeroplanes. Section 2 mandates that all models of the aeroplane must undergo a radiographic inspection of the forward and aft engine mount tubes, over their entire lengths. The inspection must be thorough, with the X-ray beam oriented in any structurally convenient direction, except for the bottom horizontal tubes of the forward mount, which must be inspected vertically. Section 4 outlines the retirement requirements for Grumman mount assemblies, which must be retired from service if any corrosion is detected or if a certain number of landings is exceeded. The obligations imposed by this legislation are primarily on the operators and maintainers of the Gulfstream (Grumman) G.159 series aeroplanes. They are required to conduct the specified inspections at the designated intervals and retire any mount assemblies that do not meet the criteria outlined in the directive. The inspections must be carried out by qualified personnel using the appropriate equipment and techniques to ensure compliance with the requirements. Breaches of this legislation can lead to significant consequences. While the specific penalties for non-compliance are not outlined in the directive, it is reasonable to assume that failure to adhere to the inspection and retirement requirements could result in the aeroplane being deemed unairworthy, which could lead to grounding and potential enforcement actions. Additionally, non-compliance could potentially result in safety incidents, which could lead to civil or criminal liability for the operators or maintainers. It is important to note that the specific penalties for non-compliance would be determined by the relevant aviation authorities and would depend on the circumstances of the breach.