AD/B747/62 Amdt 2 - Flap Carriage Spindles and Aft Link Assembly

Overview

The Civil Aviation Regulations 1998, specifically Part 39 - 105, address the safety of civil aviation through the Civil Aviation Safety Authority's (CASA) Schedule of Airworthiness Directives. This legislation was enacted to ensure that all aircraft operating in Australian airspace meet stringent safety standards. The Boeing 747 Series Aeroplanes AD/B747/62 Amendment 2, issued in response to incidents where undetected stress corrosion led to flap carriage spindle failures and aft link assembly fractures, highlights the need for rigorous safety protocols. The directive mandates inspections, overhauls, and additional work on flap carriage spindles and aft link assemblies, aligning with the Federal Aviation Administration's (FAA) AD 90-17-19 Amendment 39-6705 to maintain airworthiness and prevent potential hazards. The overarching policy objective is to ensure the safety and reliability of aircraft operations within Australia. This legislative instrument, enacted by the Commonwealth of Australia, aims to address the identified safety issues in Boeing 747 series aeroplanes by implementing specific directives that require compliance with detailed inspection and maintenance procedures. The directive is designed to mitigate risks associated with undetected stress corrosion, ensuring the structural integrity of critical components such as flap carriage spindles and aft link assemblies. The alignment with FAA standards underscores the commitment to maintaining high safety standards in civil aviation, reflecting a policy objective to protect public safety and enhance the overall safety framework governing aircraft operations in Australia.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, govern the maintenance and airworthiness of aircraft in Australia, with a particular focus on the Boeing 747 series aeroplanes as outlined in the Airworthiness Directives. This particular legislative instrument, AD/B747/62 Amendment 2, mandates the inspection and overhaul of flap carriage spindles and aft link assemblies for Boeing 747 aircraft, excluding the 747 SP model. The directive responds to incidents where undetected stress corrosion led to the failure of spindles and fractured aft links, which have caused severe handling difficulties in overseas flights. The compliance with these directives is to be achieved in accordance with the Federal Aviation Administration's (FAA) AD 90-17-19 Amendment 39-6705, with specific attention to Paragraphs A and B of the requirement document. The directive has evolved through amendments to address additional inspection and overhaul requirements, including internal inspection of the spindles, reflecting the superseding FAA AD due to divergence from the parent Boeing 747 SB-27-2280 Revision 3. This regulatory framework is integral to ensuring the safety and airworthiness of Boeing 747 aircraft operating within Australian jurisdiction, thereby upholding the stringent safety standards set by the Civil Aviation Safety Authority.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, outlines the Civil Aviation Safety Authority Schedule of Airworthiness Directives for Boeing 747 series aeroplanes. The directive AD/B747/62 Amendment 2 pertains to the flap carriage spindles and aft link assembly, applicable to all models except the 747 SP (Section 1). The directive mandates that actions must be taken in accordance with the Federal Aviation Administration's (FAA) AD 90-17-19 Amendment 39-6705, Paragraphs A and B (Section 2). Compliance with this directive is required as per the specific requirement document, ensuring that any inspections and maintenance align with the stipulated guidelines (Section 3). The primary obligation under this directive is for aircraft operators to conduct inspections and, if necessary, overhauls or replacements of the flap carriage spindles and aft link assemblies. This includes inspecting the internal condition of the spindles as well as replacing or overhauling the assemblies based on the findings. Operators must ensure that all actions are taken in accordance with the FAA AD referenced, and any maintenance or modifications must adhere to the detailed requirements outlined in the directive (Section 4). Additionally, operators must ensure that all inspections are performed at the intervals specified in the requirement document and that all work is completed by appropriately certified personnel (Section 5). Failure to comply with the provisions of this directive can result in serious safety hazards, including the risk of in-flight structural failure, which could lead to severe handling difficulties or catastrophic incidents. The Civil Aviation Safety Authority (CASA) has the authority to enforce these regulations, and non-compliance can result in penalties. The specific penalties for non-compliance are not detailed within the directive itself, but generally, such breaches can lead to fines, enforcement actions, and potential grounding of the aircraft until compliance is achieved (Section 6). Operators are advised to meticulously follow the directive to avoid any legal repercussions and ensure the continued airworthiness of their Boeing 747 aircraft.