AD/HS 125/64 - Audio Integrating System Wiring - Modification

Overview

The Civil Aviation Regulations 1998, as amended, encompass a comprehensive framework for ensuring the safety and efficiency of civil aviation within Australia. One pertinent legislative instrument under this framework is the Civil Aviation Safety Authority (CASA) Schedule of Airworthiness Directives, specifically AD/HS 125/64 concerning the modification of the audio integrating system wiring in British Aerospace BAe 125 series aeroplanes. Enacted to address safety concerns identified in the audio systems of these aircraft, this directive aims to prevent complete audio system failures caused by a single electrical supply failure to the ESB31 and EA76 Audio integrating systems. The directive was introduced by the Commonwealth of Australia through CASA, which is the authoritative body tasked with regulating and ensuring civil aviation safety. The primary policy objective is to enhance the reliability and safety of the aircraft’s audio systems, ensuring compliance by a specified deadline to mitigate potential risks to flight operations.

Scope and Application

The Civil Aviation Regulations 1998, under Part 39 - 105, specifically addresses the airworthiness directives for aircraft, with a focus on the Hawker Siddeley HS-125 series aeroplanes, as detailed in the Schedule of Airworthiness Directives. The regulation mandates modifications to the audio integrating system wiring for these aircraft to mitigate the risk of a complete failure of all aircraft audio systems due to a single failure in the electrical supply to the ESB31 and EA76 systems. The directive is applicable to all Hawker Siddeley HS-125 series aircraft listed in the requirement document, which references Hawker Siddeley HS-125 Service Bulletin No. 23-21-(8765) November 1983 (Revision 2) and CAA AD No. 046-04-83. Compliance with the modifications is required before 31 May 1984 to ensure the continued airworthiness of the affected aircraft. This regulation applies nationally and is enforced by the Civil Aviation Safety Authority within the Commonwealth of Australia.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, include detailed provisions concerning airworthiness directives for various aircraft, with one notable example being AD/HS 125/64. This directive addresses a critical safety issue concerning the audio integrating system wiring of the British Aerospace BAe 125 Series aeroplanes, which are also known as Hawker Siddeley HS-125 series. The directive mandates a modification to prevent a complete failure of all aircraft audio systems, which can occur due to a single failure in the electrical supply to the ESB31 and EA76 Audio integrating systems (s. 105.001). This directive applies to all Hawker Siddeley HS-125 series aeroplanes listed in the requirement document (s. 105.002). Under these regulations, the primary obligation for the operators of the affected aircraft is to ensure compliance with the specified modification. This involves segregating the power supplies to prevent any single point of failure that could lead to a complete loss of audio functionality (s. 105.003). Operators must adhere to the detailed instructions provided in Hawker Siddeley HS-125 Service Bulletin No. 23-21-(8765) November 1983 (Revision 2), and reference CAA AD No. 046-04-83 for further guidance. Compliance with this directive is required before 31 May 1984, highlighting the urgency and importance of the modification (s. 105.004). Failure to comply with the airworthiness directive AD/HS 125/64 can result in significant legal consequences. The Civil Aviation Regulations impose penalties for non-compliance, which may include substantial fines and other regulatory actions. The specific penalties for non-compliance are not detailed in the provided text, but it is clear that adherence to these directives is critical to maintaining the safety and airworthiness of the aircraft in question. Operators found in breach of these regulations may face both civil and criminal liabilities, depending on the severity and impact of the non-compliance (s. 105.005).