AD/G159/46 - MLG Retract Cylinder Attachment Fittings

Overview

The Civil Aviation Orders, enacted in 1988, serve as the foundational legislative framework governing civil aviation in Australia. This legislation was introduced to establish a comprehensive regulatory system for ensuring the safety and efficiency of civil aviation activities. The Civil Aviation Safety Authority, established under this Act, is tasked with administering and enforcing these Orders, including the issuing of airworthiness directives such as AD/G159/46. This particular directive pertains to the GulfStream (Grumman) G.159 series aeroplanes, specifically addressing the replacement of Main Landing Gear (MLG) retract cylinder attachment fittings. The directive mandates the replacement of these fittings with assemblies that meet specified parts numbers to mitigate identified safety concerns, ensuring compliance with the Australian Certificate of Airworthiness. The policy objective behind such directives is to maintain high safety standards within the national civil aviation system, aligning with international best practices and regulatory frameworks. Enacted by the Commonwealth of Australia Parliament, these Orders and directives aim to address specific safety gaps and ensure that all civil aviation operations within Australia meet stringent safety and operational criteria. The AD/G159/46 directive exemplifies the practical application of these legislative measures, ensuring that aircraft maintenance practices conform to safety standards, thereby protecting the public and maintaining the integrity of the aviation system.

Scope and Application

The Civil Aviation Orders, specifically under Part 105 Schedule of Airworthiness Directives, pertain to the safety and operational standards of civil aviation in Australia. The particular legislation in focus is AD/G159/46 concerning the Gulfstream (Grumman) G.159 series aeroplanes, affecting serial numbers 1 to 12, 14 to 112, 114 to 148, and 322 and 323. This directive applies to the aircraft operators and maintenance personnel responsible for the upkeep and compliance of these specific aircraft models, ensuring they meet the safety standards set by the Civil Aviation Safety Authority (CASA). The directive requires the replacement of the main landing gear (MLG) retract cylinder attachment fitting assemblies with specified parts to rectify identified safety issues. The directive is applicable nationwide, covering the entire Commonwealth of Australia and is effective from 11 September 1997. There are no stated exclusions or exemptions in the directive, and compliance is mandatory for all specified aircraft within the Australian jurisdiction. The directive may be further extended or detailed through subordinate instruments as necessary.

Key Provisions

The Civil Aviation Orders under Part 105 of the Civil Aviation Safety Authority specify a series of airworthiness directives that apply to various aircraft models, including the Gulfstream (Grumman) G.159 series aeroplanes, as outlined in AD/G159/46 (10/97). This particular directive mandates the replacement of Main Landing Gear (MLG) retract cylinder attachment fitting assemblies with new assemblies containing specific part numbers (159WM10276-1 and -2) and balls (159WM10277-1) for certain serial numbers of the aircraft (1 to 12, 14 to 112, 114 to 148 and 322 and 323). The directive references FAA AD 97-14-10 and requires compliance before the issue of an Australian Certificate of Airworthiness, effective from 11 September 1997. The obligations under this directive are straightforward yet critical for ensuring the safety and airworthiness of the specified Gulfstream (Grumman) G.159 series aeroplanes. Aircraft operators and owners must ensure that the replacement of the MLG retract cylinder attachment fittings is carried out with the specified parts before the Australian Certificate of Airworthiness is issued. This requirement applies to the aircraft serial numbers listed in the directive, and any deviation from the specified parts may render the aircraft non-compliant with Australian aviation safety standards. Failure to comply with this airworthiness directive can result in significant consequences. Operators and owners who do not adhere to the requirements for replacing the MLG retract cylinder attachment fittings risk non-compliance with Australian aviation safety regulations. While the specific civil or criminal penalties for non-compliance are not detailed in the directive, non-compliance with airworthiness directives can typically lead to enforcement actions by the Civil Aviation Safety Authority, including fines, suspension of the Certificate of Airworthiness, or other regulatory sanctions. These actions are taken to ensure that the aircraft in question meets the necessary safety standards before it is allowed to operate in Australian airspace.