AD/B747/49 - Vertical Fin Access Cover Installation

Overview

The Civil Aviation Regulations 1998, specifically under Part 39 - 105, provides comprehensive guidelines for maintaining the airworthiness of aircraft within Australia. This piece of legislation was enacted to address safety concerns in civil aviation, ensuring that all aircraft, including the Boeing 747 Series, meet stringent safety standards. The regulations were introduced to fill the gap in maintaining uniform safety standards across the aviation sector, thereby protecting passengers and crew. This regulation was enacted by the Parliament of Australia and its policy objective is to safeguard the public by ensuring that aircraft are maintained to a high standard of airworthiness. The Civil Aviation Safety Authority, through this legislative instrument, mandates the installation of a vertical fin access cover for Boeing 747 Series aeroplanes to prevent over pressurisation that could lead to structural failure, thereby enhancing flight safety.

Scope and Application

The Civil Aviation Safety Authority (CASA) Regulations 1998, specifically PART 39 - 105 concerning the Schedule of Airworthiness Directives for Boeing 747 Series Aeroplanes, mandates the installation of a vertical fin access cover as per AD/B747/49. This legislation applies to all Boeing 747 models with line numbers up to 625, focusing on ensuring the structural integrity of the vertical fin by requiring compliance with Boeing Service Bulletin 747-53A2264. The directive is a response to a determination by the Federal Aviation Administration (FAA) that the vertical fin could potentially suffer structural failure if over-pressurised, particularly in the event of a failure of the aft pressure bulkhead, as referenced in FAA AD 86-08-02. Compliance with this directive was mandatory before 30 November 1986, underscoring the urgency and critical nature of the required action.

Key Provisions

The Civil Aviation Regulations 1998, under Part 39, section 105, detail the specific airworthiness directive for Boeing 747 Series aeroplanes. This directive, AD/B747/49, mandates the installation of a vertical fin access cover as outlined in Boeing Service Bulletin 747-53A2264. This requirement applies to all models with line numbers up to 625. The directive references FAA AD 86-08-02 and necessitates compliance before 30 November 1986, responding to a safety concern identified by the Federal Aviation Administration regarding the potential for structural failure of the vertical fin due to over pressurisation from a failure of the aft pressure bulkhead. The key obligations imposed by this airworthiness directive are clear and specific. Operators of Boeing 747 Series aeroplanes must ensure that the vertical fin access cover is installed as per the instructions in Boeing Service Bulletin 747-53A2264. This involves adhering to detailed engineering specifications and timelines, ensuring that the modification is completed before the specified deadline to maintain compliance with safety standards. Failure to comply with these requirements could result in significant safety risks, thereby affecting the airworthiness of the aircraft. In terms of enforcement and consequences, the Civil Aviation Regulations 1998 do not explicitly detail the penalties for non-compliance with AD/B747/49 within the section provided. However, non-compliance with airworthiness directives generally can lead to severe consequences. Operators may face enforcement actions from the Civil Aviation Safety Authority, which could include fines, suspension of operations, or other regulatory measures. The potential for civil or criminal liability also exists if non-compliance leads to an incident or accident. The specific penalties can vary, but they are designed to enforce compliance and ensure the highest standards of aviation safety are maintained.