Overview

The Civil Aviation Regulations 1998, administered by the Civil Aviation Safety Authority, were enacted to ensure the safety of civil aviation in Australia. As part of this comprehensive regulatory framework, the legislation includes specific Airworthiness Directives (ADs) that address identified safety issues in particular aircraft models. One such directive, AD/F50/54, pertains to Fokker F50 (F27 Mk 50) series aeroplanes, specifically addressing the reinforcement of fuselage connections. This directive was introduced to mitigate the risk of fatigue-related cracks in the fuselage skin to stringer and frame connections, which were identified during fatigue tests. The policy objective of this regulation is to enhance the structural integrity of these connections, thereby improving the overall safety of the aircraft. The directive mandates that modifications be made to the specified serial numbers of Fokker F50 aeroplanes in accordance with Fokker Service Bulletin F50-53-037 dated 14 May 1991, and requires compliance before the aircraft accumulates 24,000 flight cycles. This requirement is a response to the discovery of cracks in the outside skin of the forward fuselage section, an issue that was initially addressed by AD/F50/46. By reinforcing the connections in the centre fuselage section, the directive aims to extend the fatigue life of these critical components, ensuring the continued airworthiness and safety of the affected aircraft.

Scope and Application

The Civil Aviation Safety Authority's Airworthiness Directive (AD) 2010/54 pertains specifically to Fokker F50 (F27 Mk 50) series aeroplanes with serial numbers ranging from 20103 to 20108 inclusive and from 20110 to 20149 inclusive. This directive mandates modifications to the fuselage skin to stringer and skin to frame connections to address fatigue-related issues identified in the forward fuselage section. Compliance with this directive is required before the aircraft accumulates 24,000 flight cycles. The directive references Fokker Service Bulletin F50-53-037 dated 14 May 1991, and its requirements are detailed to ensure the structural integrity of the aircraft by installing additional reinforcement angles to enhance the fatigue life of the specified connections. This directive is an essential regulatory measure under the Civil Aviation Regulations 1998, ensuring that the specified Fokker F50 aeroplanes maintain airworthiness standards throughout their operational life.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, mandate modifications to Fokker F50 (F27 Mk 50) Series aeroplanes to enhance safety. Section 39.105 outlines the requirements for fuselage skin to stringer and skin to frame connections for Fokker F50 aeroplanes with serial numbers 20103 - 20108 inclusive and 20110 - 20149 inclusive. This requirement (AD/F50/54) necessitates that modifications be carried out in accordance with Fokker Service Bulletin F50-53-037 dated 14 May 1991. This modification is referenced in RLD AD (BLA) 91-044. The directive mandates compliance prior to the aeroplane accumulating 24,000 flight cycles. Operators of the specified Fokker F50 aeroplanes must ensure that the modifications are performed by qualified personnel and that all modifications comply with the Fokker SB F50-53-037 guidelines. This includes the installation of additional reinforcement angles at the fuselage skin to stringer and skin to frame connections to improve the fatigue life of these critical components. The purpose of this requirement is to address the issue of cracks found in the outside skin of the forward fuselage section during full-scale fatigue tests, a problem previously covered by AD/F50/46. Failure to comply with the Airworthiness Directive AD/F50/54 could lead to severe consequences. According to the Civil Aviation Regulations, non-compliance with an Airworthiness Directive is an offence. The potential penalties for breaching these regulations include fines and imprisonment. Specifically, the maximum penalty for an individual who commits an offence under these regulations can include a fine of up to $21,000 and/or imprisonment for up to two years. For a body corporate, the fines can escalate to significantly higher amounts, reflecting the serious nature of non-compliance with aviation safety directives. Ensuring adherence to these regulations is crucial to maintaining the airworthiness and safety of the Fokker F50 aeroplanes in question.