AD/G159/11 Amdt 1 - Engine Mount Chafing

Overview

The Civil Aviation Orders (CAO) 1988, under the authority of the Civil Aviation Act 1988, include a comprehensive framework designed to ensure the safety of aviation in Australia, and the CAO Part 105, specifically, addresses airworthiness directives which are crucial for maintaining the safety standards of aircraft. One such directive, AD/G159/11 Amdt 1, pertains to the Gulfstream (Grumman) G.159 series aeroplanes and was enacted to address issues related to engine mount chafing. This directive was introduced to ensure the structural integrity of the engine mounts, a critical component for the safe operation of the aircraft. The directive requires inspections and the installation of chafe guards to prevent damage, with compliance mandated before the issue of an Australian Certificate of Airworthiness and at specified intervals thereafter. This legislative measure was implemented to mitigate risks associated with engine mount chafing, thereby enhancing overall aviation safety in Australia.

Scope and Application

The Civil Aviation Orders, under Part 105, pertain specifically to the Gulfstream (Grumman) G.159 series aeroplanes and mandate compliance with Airworthiness Directives (AD) issued by the Civil Aviation Safety Authority (CASA). AD/G159/11 Amendment 1, issued in 1997, focuses on the inspection and installation of chafe guards for the engine mounts to prevent chafing, ensuring that all models of the Gulfstream G.159 series aeroplanes adhere to these requirements. The directive applies to all aircraft within the specified series and is mandatory for compliance unless the necessary inspections and installations have already been performed. It is a requirement that these actions must be completed before the issuance of an Australian Certificate of Airworthiness and that the chafe guard is inspected at intervals not exceeding 2,500 hours of time in service. This directive came into effect on 9 October 1997, providing a framework for the ongoing maintenance and safety of these aircraft within Australian airspace.

Key Provisions

The primary operative section of the Civil Aviation Order (AD/G159/11 Amdt 1) mandates an inspection of the engine mount trusses for the Gulfstream (Grumman) G.159 series aeroplanes, specifically addressing chafing issues (section 1). Furthermore, it requires the installation of a chafe guard with Part Number 159WP10017-11, following Grumman Gulfstream Service Change 180. This directive ensures that any identified issues are rectified before the issuance of an Australian Certificate of Airworthiness (section 1(b)). Compliance with these requirements is critical and must be demonstrated before the aircraft can be certified as airworthy. The directive mandates that inspections of the installed chafe guard must be conducted at intervals not exceeding 2,500 hours of service time (section 1(b)). This directive has been in effect since 9 October 1997. The obligations imposed by this legislation on the parties or entities it governs are clear and specific. Aircraft owners, operators, and maintenance personnel must ensure that the inspection of the engine mount trusses and the installation of the specified chafe guard are completed. These tasks must be carried out in accordance with the instructions provided by Grumman Gulfstream Service Change 180. Additionally, post-installation, inspections of the chafe guard must be performed at intervals not exceeding 2,500 hours of service time. This requirement is integral to maintaining the airworthiness of the aircraft and ensuring ongoing compliance with safety standards. Failure to adhere to these obligations can result in serious consequences, including the inability to obtain or maintain an Australian Certificate of Airworthiness for the affected aircraft. Breach of the provisions outlined in this directive can lead to significant consequences. While the specific civil or criminal penalties are not detailed in the text, it is understood that non-compliance with airworthiness directives is taken very seriously under Australian aviation law. The consequences of failing to adhere to these requirements can include the suspension or revocation of an aircraft's Certificate of Airworthiness, which in turn can prevent the aircraft from being operated legally. Additionally, operators may face enforcement actions from the Civil Aviation Safety Authority, which can include fines and other penalties. Given the critical nature of these safety directives, any breach is likely to be met with stringent enforcement measures to uphold the high standards of aviation safety in Australia.