AD/F28/67 Amdt 1 - MLG Main Fitting Subassembly

Overview

The Civil Aviation Regulations 1998, administered by the Civil Aviation Safety Authority, were enacted to ensure the safety of civil aviation within Australia. These regulations provide a comprehensive framework to govern the operation and maintenance of aircraft, ensuring they meet stringent safety standards. A specific focus of these regulations is the issuance of airworthiness directives, such as the one concerning Fokker F28 series aeroplanes. This directive, introduced to address the issue of cracked main fitting sub-assemblies on certain models of the Fokker F28, aims to mitigate risks associated with potential loss of hydraulic fluid, thereby enhancing flight safety. The directive mandates compliance with the manufacturer's service bulletin to rectify the identified structural weaknesses, reflecting the regulatory body’s commitment to maintaining high safety standards in civil aviation. The Fokker F28 Series Aeroplanes AD/F28/67 Amendment 1, which updates the compliance requirements for the MLG Main Fitting Subassembly, is a response to identified corrosion issues that could compromise the structural integrity of the aircraft. This amendment was introduced to ensure that the affected aircraft are maintained according to the latest safety standards provided by the manufacturer, Dowty Aerospace. The objective of this amendment is to extend the applicability of the directive to additional undercarriage units, ensuring a broader scope of compliance and thereby enhancing the overall safety of the Fokker F28 fleet. This proactive measure demonstrates the Civil Aviation Safety Authority’s dedication to addressing and preventing potential safety hazards in civil aviation.

Scope and Application

The Civil Aviation Regulations 1998, specifically PART 39 - 105, pertains to the Civil Aviation Safety Authority's schedule of airworthiness directives, with a particular focus on Fokker F28 series aeroplanes. The scope of this directive applies to Fokker F28 series aircraft, excluding the Mk 0100 model, that are equipped with Dowty Aerospace main undercarriage units. The directive mandates compliance with Dowty Aerospace Mandatory Service Bulletin 32-161R Revision 2 and references RLD AD 91-080. The directive requires corrective actions to be completed prior to 1 September 1992, with Amendment 1 extending the applicability to additional undercarriage units. The amendment is effective from 2 April 1992, following the identification of cracks in the main fitting sub-assemblies, which have led to loss of fluid and were caused by damage to the anodic film and subsequent corrosion. This regulation applies nationally within the Commonwealth of Australia, and its application is overseen by the Civil Aviation Safety Authority.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39, include Airworthiness Directives (ADs) that are critical for ensuring the safety of aircraft operations. For the Fokker F28 series aeroplanes, AD/F28/67 Amendment 1 pertains to the main landing gear (MLG) main fitting subassembly (section 4/92). This directive applies to F28 series models excluding the Mk 0100, that are equipped with specific Dowty Aerospace main undercarriage units. The directive requires compliance with Dowty Aerospace's Mandatory Service Bulletin 32-161R Revision 2, which outlines specific actions to address issues identified in the MLG main fitting subassembly. This directive references RLD AD 91-080 and notes that compliance was initially required before 1 September 1992, with a previous compliance date of 31 December 1991. Amendment 1 extends the applicability to additional undercarriage units and was issued to align with the revision of the manufacturer’s document, becoming effective from 2 April 1992. Under the Civil Aviation Regulations 1998, the AD/F28/67 Amendment 1 mandates that operators of affected Fokker F28 series aeroplanes must adhere to the specified actions outlined in the Dowty Aerospace Mandatory Service Bulletin. These actions are crucial for preventing failures in the MLG main fitting subassembly, which have been linked to cracks through the side strut attachment lug to the main bore, leading to loss of hydraulic fluid. The failures were traced to damage of the anodic film and subsequent corrosion. The Netherlands Authority initially set the compliance deadline, which was extended by one month, and the new compliance date now stands as prior to 1 September 1992. Failure to comply with AD/F28/67 Amendment 1 can result in significant consequences. The Civil Aviation Regulations 1998 impose strict obligations on aircraft operators to ensure their aircraft meet the required airworthiness standards. Non-compliance with an AD can lead to penalties under the Civil Aviation Act 1988. Operators who do not adhere to the directive could face enforcement actions, which may include fines or other sanctions. The specific penalties for non-compliance are not detailed in the provided text, but they can be severe, reflecting the importance of maintaining the airworthiness of aircraft to ensure public safety. The AD/F28/67 Amendment 1 also carries civil and potentially criminal consequences for non-compliance. Civil penalties may include substantial fines, while criminal penalties could arise if the failure to comply is deemed to have caused significant harm or endangered public safety. Although the exact penalties are not specified in the provided text, the overarching legal framework ensures that serious breaches of airworthiness directives are met with appropriate legal action to enforce compliance and uphold safety standards within the aviation industry.