AD/B747/109 - Passenger Oxygen System Continuous Flow Control Unit

Overview

The Civil Aviation Regulations 1998, as amended, are administered by the Civil Aviation Safety Authority (CASA) and provide a comprehensive framework for ensuring the safety of civil aviation in Australia. One specific legislative instrument under this Act, identified as F2006B03010, pertains to the airworthiness directives for Boeing 747 series aeroplanes, specifically addressing the passenger oxygen system's continuous flow control unit. This directive was introduced to address reports of manufacturing defects in the flow control units, which, if not rectified, could hinder the automatic deployment of oxygen to passengers in the event of cabin depressurisation. The directive mandates compliance within 4,000 hours of time in service after 30 April 1992, and requires actions to be taken in accordance with the Accomplishment Instructions of Boeing Service Bulletin 747-35-2074 Revision 1. The policy objective is to ensure the reliability and safety of the passenger oxygen system, thereby protecting passengers on board Boeing 747 series aircraft.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105 under the Civil Aviation Safety Authority Schedule of Airworthiness Directives, pertains to the Boeing 747 series aeroplanes, with a focus on ensuring the passenger oxygen system's continuous flow control unit meets specified safety standards. This regulation applies to all Boeing 747 series aircraft that are identified in Boeing Service Bulletin 747-35-2074 Revision 1. The requirement is for these aircraft to undertake actions as detailed in the Accomplishment Instructions provided in the aforementioned service bulletin. The directive also references FAA AD 92-04-03 Amendment 39-8172, which provides further context and guidance for compliance. The primary concern addressed by this regulation is the potential failure of flow control units to activate at the correct altitude, which can be attributed to manufacturing defects. If unaddressed, these defects can impede the automatic deployment of oxygen to passengers in the event of cabin pressure loss, thereby compromising passenger safety. Compliance with this directive must be achieved within 4000 hours of time in service following 30 April 1992. The scope of this legislative instrument is national, applying to all Boeing 747 series aircraft operating within Australia, overseen by the Civil Aviation Safety Authority. The regulation does not explicitly mention any exclusions or exemptions, implying that it applies universally to the specified aircraft and conditions. The application of this directive may be further refined or extended through subordinate instruments issued by the relevant authorities, ensuring ongoing compliance and safety standards within the civil aviation sector.

Key Provisions

The Civil Aviation Regulations 1998, specifically under Part 39 - 105, establish the Civil Aviation Safety Authority's schedule of airworthiness directives for various aircraft types, including the Boeing 747 series aeroplanes. The directive AD/B747/109 pertains to the passenger oxygen system continuous flow control unit, which was issued on 5 September 1992 (section 39 - 105). This directive applies to Boeing 747 series aircraft that are listed in Boeing Service Bulletin 747-35-2074 Revision 1 (section 39 - 105). The requirement under this directive is to take action in accordance with the Accomplishment Instructions outlined in Boeing Service Bulletin 747-35-2074 Revision 1 (section 39 - 105). This action is necessary to address manufacturing defects in the flow control units that could prevent the automatic deployment of oxygen to the passenger oxygen system in the event of a loss of cabin pressure (section 39 - 105). The obligations imposed by this directive on the parties or entities it governs include ensuring that the specified action is taken on the Boeing 747 series aircraft within the stipulated timeframe. Operators and owners of the affected Boeing 747 series aircraft must comply with the directive by replacing or repairing the flow control units within 4000 hours time in service after 30 April 1992 (section 39 - 105). This requirement is critical to maintaining the airworthiness of the aircraft and ensuring the safety of passengers and crew by preventing potential malfunctions of the passenger oxygen system (section 39 - 105). Failure to comply with the airworthiness directive AD/B747/109 could lead to serious consequences, including potential civil or criminal penalties. The specific consequences and penalties for non-compliance are not detailed in the extract provided, but it is clear that the directive is intended to enforce compliance to ensure the safety of passengers and crew. The Civil Aviation Safety Authority may take enforcement action against operators or owners who fail to comply with the directive, which could include fines, suspension or revocation of airworthiness certificates, or other regulatory actions (section 39 - 105). Additionally, non-compliance could result in criminal charges if the failure to comply with the directive leads to an incident or accident that causes harm or endangers safety (section 39 - 105).