AD/HS 125/145 - Electrical Wiring Chafing

Overview

The Civil Aviation Regulations 1998, enacted by the Commonwealth of Australia, provide a comprehensive framework governing civil aviation safety across the nation. One specific instrument under this act, F2006B10425, addresses the issue of electrical wiring chafing in British Aerospace BAe 125 Series aeroplanes, particularly the Hawker 1000 and BAe 125 Series 1000A and B variants. This directive, issued by the Civil Aviation Safety Authority, aims to mitigate the risk of electrical malfunctions and in-flight fires caused by chafing of electrical cables on hydraulic pipes. The directive requires compliance with the Hawker Raytheon Corporate Jets Mandatory Service Bulletin SB A29-92 Revision 1, which was classified as mandatory by the UK's Civil Aviation Authority. The policy objective is to enhance the safety of these aircraft by addressing potential hazards proactively before they escalate into critical incidents.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105 concerning the Civil Aviation Safety Authority's Schedule of Airworthiness Directives, governs the maintenance and safety requirements for certain aircraft, including the British Aerospace BAe 125 Series Aeroplanes, such as the Hawker 1000 and BAe 125 Series 1000A and B aircraft. This legislation applies directly to these specified aircraft, mandating compliance with Hawker Raytheon Corporate Jets Mandatory Service Bulletin SB A29-92 Revision 1 dated 1 August 1994, which addresses the issue of electrical wiring chafing on hydraulic pipes. The directive requires that the specified maintenance action be completed by all affected aircraft prior to 30 October 1994 to mitigate risks associated with insulation breakdown and potential electrical short circuits, which could otherwise lead to hydraulic failures, electrical malfunctions, or in-flight fires. The regulation extends across the Commonwealth of Australia, ensuring a uniform approach to the safety and airworthiness of these aircraft nationwide.

Key Provisions

The Civil Aviation Regulations 1998, under Part 39, specifically section 105, mandate the Civil Aviation Safety Authority to issue Airworthiness Directives. One such directive, AD/HS 125/145, pertains to the British Aerospace BAe 125 Series Aeroplanes, focusing on the issue of electrical wiring chafing (Section 105). This directive applies to Hawker 1000 and BAe 125 Series 1000A and B aircraft, identified in Hawker Raytheon Corporate Jets Mandatory Service Bulletin SB A29-92 Revision 1 dated 1 August 1994. It requires that action be taken in accordance with the mentioned Service Bulletin if not already completed (Section 105). The directive imposes several obligations on the aircraft operators and maintenance personnel. Primarily, they must ensure that the specified action outlined in the Hawker Raytheon Corporate Jets Mandatory Service Bulletin SB A29-92 Revision 1 is carried out on the affected aircraft models. This involves addressing the reported issue of electrical cable/loom chafing on a hydraulic pipe, which has led to insulation breakdown, electrical short circuits, and potential pin-hole failures of the hydraulic pipe (Section 105). The objective of this directive is to mitigate the risks of loss of hydraulic pressure, electrical malfunctions, or in-flight fires. Compliance with this directive must be achieved before 30 October 1994. Failure to comply with the requirements of this Airworthiness Directive may result in serious consequences. The directive notes that the Service Bulletin has been classified as mandatory by the Civil Aviation Authority (UK), indicating the critical nature of the issue. While the specific penalties for non-compliance are not detailed in the excerpt, it is clear that breaches of airworthiness directives can lead to severe civil and criminal consequences. Typically, penalties may include fines, enforcement actions, and potential grounding of the aircraft until compliance is achieved. Ensuring adherence to such directives is crucial for maintaining the safety and airworthiness of the aircraft involved.