AD/F27/123 - Flight Compartment Window Frames

Overview

The Civil Aviation Regulations 1998, enacted by the Australian Government, form part of a comprehensive framework designed to ensure the safety and efficiency of civil aviation in Australia. This legislation, administered by the Civil Aviation Safety Authority (CASA), aims to provide a robust and adaptable regulatory environment that meets both national and international standards. One specific area addressed by these regulations is the issuance of Airworthiness Directives (ADs), which are legal requirements that ensure the ongoing airworthiness of aircraft. AD/F27/123, introduced to mitigate identified risks associated with the Fokker F27 Series aeroplanes, mandates a specific inspection of flight compartment window frames to prevent potential structural failures. The directive was developed in response to fatigue test results indicating potential cracks in the window post assemblies of similar models, particularly in side frames and frame corners, thereby underscoring the need for stringent safety measures. The policy objective of AD/F27/123 is to ensure the structural integrity of the Fokker F27 Series aeroplanes by requiring a one-time inspection to detect and address any potential defects. This proactive approach aims to enhance flight safety and prevent in-service failures, thereby protecting passengers, crew, and the general public. Compliance with this directive is mandatory for specified aircraft serial numbers, with inspections required either upon accumulating a certain number of pressurisation cycles or before a designated deadline. The incorporation of repair schemes as outlined in relevant Fokker service bulletins ensures that any identified issues are appropriately addressed, thereby maintaining the overall airworthiness of the affected aircraft.

Scope and Application

The Civil Aviation Regulations 1998, under Part 39 - 105 and the Civil Aviation Safety Authority's Schedule of Airworthiness Directives, specifically address the maintenance and inspection requirements for Fokker F27 series aeroplanes. This legislation applies to Fokker F27 series aircraft with particular serial numbers that have been modified according to Fokker Service Bulletin F27/21-30. The scope of the legislation mandates a specific inspection of the flight compartment window frames for signs of cracking, as indicated by full-scale fatigue tests on similar models which revealed potential weaknesses in the side frames and frame corners. The compliance requirements specify inspection timings based on the number of pressurisation cycles accumulated by the aircraft or a fixed date, 26 December 1991, whichever is later. The legislation is applicable nationwide, as it is a Commonwealth regulation, ensuring a uniform approach to airworthiness across Australia. There are no exclusions or exemptions explicitly stated in the directive, meaning all specified aircraft must adhere to the outlined inspection procedures. The application of this directive may be further detailed or extended through subordinate instruments issued by the Civil Aviation Safety Authority.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39, contains Airworthiness Directives (AD) for various types of aircraft, including the Fokker F27 Series Aeroplanes. AD/F27/123 pertains to the flight compartment window frames and mandates a thorough inspection of these components to ensure airworthiness. The AD applies to specific serial numbers of Fokker F27 aircraft that have undergone certain modifications as per Fokker Service Bulletin F27/21-30. The inspection must adhere to the technical requirements outlined in RLD AD 89-12-5, dated 13 October 1989, and is further referenced in Fokker Service Bulletin F27/53-109, dated 10 October 1989. Operators and owners of the affected Fokker F27 aircraft must comply with the inspection requirements detailed in AD/F27/123. For aircraft serial numbers 10561 to 10684 inclusive, 10686, 10687, and 10689 to 10692 inclusive, the inspection must occur either after the aircraft accumulates 20,000 pressurisation cycles or before 26 December 1991, whichever comes later. For other specified serial numbers (10102, and 10105 to 10560 inclusive), the inspection must be conducted after 30,000 pressurisation cycles or before 26 December 1991, whichever is later. This ensures that any potential issues with the window frames are identified and rectified before they compromise the safety of the aircraft. Failure to comply with the AD/F27/123 can result in severe consequences. The Civil Aviation Regulations do not explicitly state penalties for non-compliance in this context, but non-compliance with airworthiness directives generally can lead to significant civil or criminal penalties. These may include fines, suspension or revocation of airworthiness certificates, and potential criminal charges if the non-compliance leads to an aviation accident or incident. The seriousness of these consequences underscores the importance of adhering to the regulatory requirements outlined in the AD.