AD/F50/75 - Aft Fuselage Skin Joint

Overview

The Civil Aviation Regulations 1998, administered by the Civil Aviation Safety Authority (CASA), were enacted to establish comprehensive regulations for civil aviation in Australia, ensuring safety and uniformity across the industry. One such regulation, AD/F50/75, pertains specifically to Fokker F50 (F27 Mk 50) Series Aeroplanes, focusing on addressing the issue of fatigue cracking discovered in the aft fuselage skin joint. This Airworthiness Directive was introduced to rectify the identified safety concern by mandating inspections to detect any fatigue cracking that could compromise the structural integrity of the aircraft. The objective is to ensure that the aircraft remain airworthy by identifying and addressing potential safety hazards before they escalate, thus maintaining high safety standards in civil aviation operations.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, applies to all Fokker F50 (F27 Mk 50) series aeroplanes with serial numbers F27 Mk 050. This legislation mandates that an inspection must be carried out on the aft fuselage skin joint, in accordance with Fokker Service Bulletin F50-53-053, to address issues of fatigue cracking that have been identified. This requirement is to ensure the safety of the aircraft and prevent any unsafe conditions arising from such cracking. The directive is in response to the discovery of fatigue cracking on the left-hand side of the fuselage between stations 15375 and 16275, which was found during investigations into pressurisation problems. The inspection must be completed either before the aircraft accumulates 10,000 flight cycles from new, or within six months after 22 May 1997, whichever is later. The Airworthiness Directive is effective from 22 May 1997, and it references Netherlands AD 1997-022(A) for further guidance. This regulation applies nationally within the Commonwealth of Australia and is enforced by the Civil Aviation Safety Authority.

Key Provisions

The key provisions of AD/F50/75, part of the Civil Aviation Regulations 1998, apply specifically to Fokker F50 (F27 Mk 50) Series Aeroplanes, with serial numbers F27 Mk 050. This directive mandates that these aircraft undergo an inspection of the aft fuselage skin joint to address potential fatigue cracking issues. The inspection must be conducted in accordance with Fokker Service Bulletin F50-53-053 (Section 1). The directive references Netherlands AD 1997-022(A) and stipulates that compliance is necessary either before the aircraft accumulates 10,000 flight cycles from new, or within six months after 22 May 1997, whichever comes last (Section 2). The directive becomes effective on 22 May 1997. This legislation imposes clear obligations on the owners and operators of the specified Fokker F50 aircraft. They must ensure that an inspection is carried out by a certified inspector, in line with the guidelines provided in Fokker Service Bulletin F50-53-053. This inspection is critical for identifying any fatigue cracking in the specified area of the aft fuselage skin joint. If any issues are detected, corrective action must be taken to ensure the aircraft remains airworthy. Compliance with this directive is mandatory, and failure to adhere to the specified timelines can lead to serious safety risks. Failure to comply with the requirements of AD/F50/75 may result in severe consequences. The Civil Aviation Safety Authority (CASA) can impose penalties on operators who do not comply with Airworthiness Directives. The exact nature and severity of these penalties are not detailed within the directive itself but typically include fines, suspension or revocation of the aircraft’s certificate of airworthiness, and potential criminal charges if non-compliance leads to an unsafe condition. The maximum penalties are not explicitly stated in the directive but are aligned with the broader regulatory framework governing civil aviation safety in Australia.