AD/A320/67 - MLG Free Fall Extension System

Overview

The Civil Aviation Regulations 1998, enacted by the Parliament of Australia, provide a comprehensive framework governing various aspects of civil aviation safety within Australia. Part 39, specifically, pertains to airworthiness directives aimed at ensuring the safety of aircraft operations. The 1998 Regulations were introduced to address the need for stringent safety measures and regulatory compliance in the aviation industry, thereby protecting the public and enhancing the safety of air travel. One such directive under these regulations is the Airbus Industrie A319, A320 and A321 Series Aeroplanes AD/A320/67, which addresses potential issues related to the Main Landing Gear (MLG) Free Fall Extension System. This directive mandates specific actions to be taken by operators to ensure the continued airworthiness and safety of these aircraft models. The policy objective of these regulations is to maintain and improve the safety standards of civil aviation by requiring regular inspections and timely corrective actions for identified safety issues. The specific directive AD/A320/67 was introduced to address the possibility of interference between the MLG free fall extension system components, which could compromise the functionality of the landing gear system. This directive sets out clear timelines and actions to be undertaken based on the clearance measurements between the MLG free fall extension system bellcrank installation and the reinforcement bracket, ensuring that any potential safety hazards are identified and rectified promptly.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105 under the Civil Aviation Safety Authority's Schedule of Airworthiness Directives, applies to Airbus Industrie A319, A320, and A321 series aeroplanes with certain serial numbers and revisions as noted in AD/A320/67. This legislation is focused on ensuring the airworthiness of these aircraft by addressing potential issues with the Main Landing Gear (MLG) free fall extension system. The regulations apply to aeroplanes within specified serial number ranges that have not yet incorporated Airbus Industrie Service Bulletin A320-53-1023 Revision 7. The compliance requirements outlined in the directive must be strictly adhered to, including inspections and necessary modifications to prevent interference between the MLG free fall extension system bellcrank installation and the reinforcement bracket. This directive ensures the safety and reliability of the MLG system, thereby safeguarding the aircraft's operational integrity. The directive is applicable across the Commonwealth of Australia, overseen by the Civil Aviation Safety Authority, ensuring uniform safety standards are met nationally.

Key Provisions

The Civil Aviation Regulations 1998, particularly Part 39, Section 105, include detailed directives for the airworthiness of specific aircraft models, such as the Airbus Industrie A319, A320, and A321 series aeroplanes. The Airworthiness Directive AD/A320/67, effective from 6/96, pertains to the MLG (Main Landing Gear) Free Fall Extension System and applies to certain serial numbers of these aircraft models, specifically those with Airbus Industrie Service Bulletin A320-53-1023 Rev. 6 or earlier revisions incorporated. The directive mandates actions to be taken in accordance with Airbus Industrie's Airworthiness Directive 53-08, Revision 1, dated 15 January 1996. Compliance with this directive involves inspections and potential modifications to the reinforcement brackets and bellcrank system to ensure there is no interference, which could compromise the operation of the MLG free fall system. The obligations under this directive require operators and maintainers of the specified Airbus aircraft to inspect the MLG free fall extension system within 1000 flights after 23 May 1996. Depending on the findings, the reinforcement brackets may need to be reinstalled or reworked. If the clearance between the MLG free fall extension system bellcrank installation and the reinforcement bracket is greater than 3mm with no interference, the brackets should be reinstalled within five years of the directive's effective date. If the clearance is less than 3mm with no interference, the brackets must be reinstalled within 18 months of the directive's effective date. If there is evidence of interference, the brackets must be reinstalled or the bellcrank lever reworked before further flight, and subsequently, within five years of the directive's effective date, the reinforcement bracket fasteners must be reinstalled. The full incorporation of Airbus Industrie Service Bulletin A320-53-1023 Rev. 7 cancels the requirements of this Airworthiness Directive. Failure to comply with the provisions of this Airworthiness Directive could result in severe consequences, as the MLG free fall system is critical for safe landing operations. Non-compliance could lead to operational failures or safety hazards, potentially resulting in accidents or incidents. The Civil Aviation Safety Authority (CASA) may take enforcement actions against operators or maintainers who fail to adhere to the requirements, which could include fines, penalties, or other regulatory actions. The specific penalties for non-compliance are not detailed in the directive but are generally in line with the broader regulatory framework under the Civil Aviation Act 1988 and associated regulations. The consequences of failing to address these airworthiness issues can be severe, impacting the safety and certification of the aircraft in question.