AD/B747/106 - Cabin Entertainment System Wire Bundle Chafing

Overview

The Civil Aviation Regulations 1998, as amended by Part 39 - 105, introduced an Airworthiness Directive (AD) in 1992 to address a specific safety concern associated with Boeing 747-400 series aircraft. This directive, AD/B747/106, pertains to the issue of chafed wires within the advanced cabin entertainment service system (ACESS) wire bundle, which had resulted in short circuits and burned wire bundles. The problem was identified through reports of potential smoke and fire hazards in the passenger cabin if not addressed. The Federal Parliament enacted this legislation to mandate corrective actions in line with Boeing Alert Service Bulletin 747-23A2241 Revision 3, with the overarching policy objective of ensuring the safety and reliability of civil aviation operations by mitigating identified risks. The directive was necessitated by the urgent need to rectify the issue of wire chafing, which, if unaddressed, could have resulted in severe safety incidents. This regulatory measure underscores the commitment of the Civil Aviation Safety Authority to proactively manage and resolve safety issues to maintain the highest standards of airworthiness.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105 under the Civil Aviation Safety Authority (CASA) Schedule of Airworthiness Directives, apply to all Boeing 747-400 series aircraft as listed in Boeing Alert Service Bulletin 747-23A2241 Revision 3. This legislation mandates action in accordance with the specified bulletin to address issues of chafed wires in the advanced cabin entertainment system (ACESS) wire bundle, which have been reported to result in short circuits and burned wire bundles, potentially leading to smoke and fire in the passenger cabin. The directive requires compliance and corrective action prior to 2 April 1993. The legislation not only covers the aircraft types affected but also aligns with Federal Aviation Administration (FAA) AD 91-23-10, ensuring a coordinated approach to airworthiness and safety across jurisdictions. The scope of this regulation is strictly limited to the specified aircraft model and the particular safety issue identified, with no stated exclusions or exemptions within the provided excerpt.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39-105 concerning the Boeing 747 Series Aeroplanes, includes Airworthiness Directive (AD) B747/106 regarding the Cabin Entertainment System Wire Bundle Chafing (4/92). This directive applies to all Boeing 747-400 series aircraft listed in Boeing Alert Service Bulletin 747-23A2241 Revision 3. The primary requirement outlined in this directive is to take corrective action as detailed in the aforementioned Boeing Alert Service Bulletin (section 105). It is noteworthy that the Federal Aviation Administration (FAA) has also issued a corresponding AD, FAA AD 91-23-10, which refers to this directive. Compliance with this directive was necessary prior to 2 April 1993. The obligations imposed by this AD on the parties or entities it governs are clear and specific. Operators of Boeing 747-400 series aircraft must ensure that their aircraft comply with the corrective measures detailed in Boeing Alert Service Bulletin 747-23A2241 Revision 3. This involves inspecting the advanced cabin entertainment service system (ACESS) wire bundle for signs of chafing and taking necessary action to prevent short circuits, which could lead to burned wire bundles and potentially smoke and fire in the passenger cabin. The directive underscores the importance of proactive maintenance and adherence to manufacturer recommendations to ensure airworthiness and passenger safety. Failure to comply with the requirements of AD B747/106 could result in serious consequences. Although the specific offences and penalties are not detailed in the text provided, non-compliance with airworthiness directives generally carries significant civil and criminal repercussions under the Civil Aviation Act 1988 and associated regulations. In general, such non-compliance can result in fines, suspension or revocation of air operator certificates, and potential criminal charges against responsible individuals, which could include imprisonment. The exact penalties would depend on the severity of the breach and the jurisdiction's enforcement actions. It is critical for operators to adhere strictly to these directives to avoid these severe outcomes.