COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Fokker F28 Series Aeroplanes
AD/F28/50
Amdt 1
Boundary Layer Fence 10/86
Applicability: All model F28 with S/Nos 11092, 11093, 11111 to 11234, 11237 and 11238. Requirement: Action in accordance with Fokker S.B. F28/57-75, Rev. 1.
Note: RLD AD 85-45 Rev. 2 refers.
Compliance: Prior to 31 December 1987.
Air-leakage through boundary layer fences results in a deterioration of the wing performance. Modified boundary layer fences provide labyrinth-type seals to overcome this problem. Amendment 1 of this Directive references Rev 1 of Fokker SB F28/57-75 which requires additional work.
Overview
The Civil Aviation Regulations 1998, administered by the Civil Aviation Safety Authority (CASA), are fundamental to ensuring the safety and airworthiness of aircraft operating within Australia. Among these regulations, Part 39 outlines the Airworthiness Directives, which are binding orders issued by CASA to address specific safety concerns. One such directive, AD/F28/50 Amendment 1, applies to Fokker F28 Series aeroplanes with specific serial numbers, mandating modifications to the boundary layer fences to prevent air leakage and maintain wing performance. This directive was introduced to address the problem of air-leakage through boundary layer fences, which can lead to a deterioration in wing performance. CASA's objective through this regulation is to ensure that the specified aircraft models remain airworthy and safe for operation by implementing necessary modifications as per the referenced Fokker Service Bulletin.
The Airworthiness Directives, including AD/F28/50 Amendment 1, are crafted to respond to identified safety risks and ensure compliance by a specific deadline. The requirement in this directive is for aircraft owners and operators to take action in accordance with Fokker Service Bulletin F28/57-75, Revision 1, which provides detailed instructions on implementing the necessary modifications. By mandating these changes, CASA aims to mitigate the risk of air leakage and maintain the structural integrity of the affected Fokker F28 aeroplanes. This directive underscores the importance of adhering to specific maintenance and modification protocols to uphold the highest safety standards in civil aviation.
Scope and Application
The Civil Aviation Regulations 1998, specifically PART 39 - 105, outlines the Civil Aviation Safety Authority's schedule of airworthiness directives for certain Fokker F28 series aeroplanes, with this particular directive (AD/F28/50 Amendment 1) applying to all Fokker F28 models with specific serial numbers. The regulation targets the issue of air leakage through boundary layer fences, which can negatively affect the performance of the wings, and mandates modifications in line with Fokker Service Bulletin F28/57-75, Revision 1, to ensure these aircraft maintain safe operational standards. This directive applies at the Commonwealth level, governed by the Civil Aviation Safety Authority, and requires compliance by the specified aircraft within the given timeframe to address the identified safety concern. Notably, this directive does not specify exclusions or exemptions but mandates corrective actions to be completed before the specified deadline to ensure airworthiness and safety in line with the regulations.
Key Provisions
The Civil Aviation Regulations 1998, particularly Part 39, includes a schedule of airworthiness directives for various aircraft, including the Fokker F28 Series Aeroplanes. Specifically, AD/F28/50 Amendment 1 pertains to the boundary layer fence, which is critical for maintaining the structural integrity of the wings. According to section 10 of this directive, the requirement applies to all model F28 aeroplanes with specific serial numbers, namely 11092, 11093, 11111 to 11234, 11237, and 11238. The directive mandates that these aircraft must comply with Fokker Service Bulletin F28/57-75, Revision 1, which outlines the necessary modifications to the boundary layer fences. This action is crucial to prevent air leakage, which can deteriorate wing performance over time.
The obligations imposed by this directive are stringent, as it mandates specific modifications to the aircraft's boundary layer fences. Operators and owners of the affected Fokker F28 aeroplanes must ensure that these modifications are carried out by certified personnel following the guidelines provided in Fokker Service Bulletin F28/57-75, Revision 1. This requirement is particularly pressing because air leakage through the boundary layer fences can significantly impair the wing's aerodynamic efficiency, potentially leading to hazardous flight conditions. The directive also references RLD AD 85-45, Revision 2, which provides additional guidance on the compliance and implementation of these modifications.
Failure to comply with AD/F28/50 Amendment 1 could result in severe consequences, as it pertains to the safety and airworthiness of the aircraft. The Civil Aviation Safety Authority (CASA) enforces these regulations rigorously, and non-compliance can lead to enforcement actions. Although the specific penalties are not detailed in the text, non-compliance with airworthiness directives can result in significant civil or criminal penalties, including fines and potential grounding of the aircraft. The overarching aim of these provisions is to ensure that the affected Fokker F28 aeroplanes maintain their airworthiness and operational safety standards, thereby protecting the safety of all passengers and crew on board.