Overview

The Airworthiness Directive (AD) F2006B10456, enacted in 2004 by the Civil Aviation Safety Authority (CASA) as a delegate, addresses the safety concerns associated with potential electrical arcing and heat damage to wire bundles in British Aerospace BAe 125 Series Aeroplanes. This directive was introduced to rectify an unsafe condition identified in the wire bundles extending from relays 'JT' and 'KT' on Panel 'JA', and the wire bundle entering pressure bung 'DD'. The potential risks of electrical arcing and resultant heat damage in a fuel zone could lead to catastrophic outcomes such as fire or explosion in the fuel tank. The policy objective of the AD is to mandate a one-time detailed inspection and necessary corrective actions to mitigate these risks, ensuring the continued airworthiness and safety of the specified aircraft models.

Scope and Application

The Airworthiness Directive AD/HS 125/173 issued by the Civil Aviation Safety Authority (CASA) under the Civil Aviation Safety Regulations 1998 applies specifically to the British Aerospace BAe 125 series 800A, 800A (C-29A) and 800B aeroplanes, as well as the Model Hawker 800 aeroplanes listed in Raytheon Service Bulletin SB 24-3588, Revision 1. This directive mandates a one-time detailed inspection of the wire bundles extending from relays 'JT' and 'KT' on Panel 'JA', and the wire bundle entering pressure bung 'DD'. The inspection is to be conducted in accordance with the Accomplishment Instructions of SB 24-3588, Revision 1, with any detected discrepancies corrected prior to further flight. The requirement for compliance must be met within 125 flight hours or 90 days after the effective date of the directive, whichever occurs first. This Airworthiness Directive is applicable nationally within Australia and is effective as of 5 August 2004.

Key Provisions

This Airworthiness Directive (AD) focuses on British Aerospace BAe 125 Series Aeroplanes, specifically the 800A, 800A (C-29A), and 800B models, as well as the Model Hawker 800 aeroplanes, as listed in Raytheon Service Bulletin SB 24-3588, Revision 1, dated September 2003 (Section 2.1). The AD requires a one-time detailed inspection of certain wire bundles to detect any discrepancies. This inspection must be conducted in accordance with Part 3.A. of the Accomplishment Instructions of SB 24-3588, Revision 1, which includes an intensive visual examination of the wire bundles extending from relays 'JT' and 'KT' on Panel 'JA', and the wire bundle entering pressure bung 'DD'. If any discrepancies are found during this inspection, they must be corrected in accordance with the same part of the Accomplishment Instructions. Notably, inspections and corrective actions performed before the effective date of this Directive, as per Raytheon Service Bulletin SB 24-3588, dated February 2003, are considered acceptable for compliance. The obligations imposed by this AD include ensuring that the required inspection is conducted within 125 flight hours or 90 days after the effective date of the Directive, whichever comes first, and any corrective actions must be completed before further flight after the inspection (Section 3.1). The AD is effective as of 5 August 2004, and it references FAA AD 2004-12-02 Amdt 39-13661. Failure to comply with the requirements of this AD can result in serious safety issues, as the purpose of the inspection and corrective action is to prevent chafing and damage to the wire bundles, which could lead to electrical arcing, heat damage in a potential fuel zone, and possibly a fire or explosion in the fuel tank. While the legislation does not explicitly state penalties for non-compliance, it is clear that failure to adhere to the AD could lead to significant safety risks, potentially resulting in severe consequences for aircraft operations.