AD/HS 125/147 - Cable Loom Inspection

Overview

The Civil Aviation Safety Authority (CASA) introduced the Civil Aviation Regulations 1998 as part of the Commonwealth of Australia’s legislative framework to regulate civil aviation safety. This particular regulation, AD/HS 125/147, was enacted to address an identified safety concern with British Aerospace BAe 125 Series aeroplanes, specifically the Hawker 1000, BAe 125 Series 1000A and B aircraft. The problem it aimed to resolve was the potential for damage to the electrical cable loom behind the right-hand throttle box cover, caused by the flap selector spring strut, which could lead to a failure of the electrical systems if left unaddressed. This directive was introduced to ensure the early detection of such damage and to mitigate the risk of electrical system failures, thereby enhancing the safety of these aircraft. The policy objective behind this directive is to mandate the inspection of the electrical cable loom in accordance with Hawker Raytheon Corporate Jets Mandatory Service Bulletin SB 24-313 dated 19 December 1994, ensuring compliance by 31 July 1995. The directive is applicable to specific aircraft models as identified and is intended to prevent potential hazards that could compromise the safety of the aircraft and its occupants.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, pertains to the Civil Aviation Safety Authority’s Schedule of Airworthiness Directives, which governs the operational safety of aircraft within Australia. This particular Airworthiness Directive, AD/HS 125/147, applies to the British Aerospace BAe 125 Series aeroplanes, including the Hawker 1000, BAe 125 Series 1000A and B aircraft, as identified in the Hawker Raytheon Corporate Jets Mandatory Service Bulletin SB 24-313 dated 19 December 1994. The requirement is to inspect the electrical cable loom behind the right-hand throttle box cover in accordance with the aforementioned bulletin, which has been classified as mandatory by the UK’s Civil Aviation Authority. Compliance with this directive is mandatory and must be achieved before 31 July 1995 to prevent potential failure of the electrical systems, which could result from damage to the cable loom caused by the flap selector spring strut. This directive aims to ensure early detection and rectification of any damage, thereby maintaining the safety standards required for these aircraft within the Commonwealth of Australia.

Key Provisions

The Civil Aviation Regulations 1998 (Part 39 - 105) establish critical safety measures for aircraft operation, specifically targeting the British Aerospace BAe 125 Series aeroplanes. One of the key provisions is the Airworthiness Directive AD/HS 125/147 (Section 3/95), which mandates inspections of the electrical cable loom behind the right-hand throttle box cover. This directive applies to the Hawker 1000, BAe 125 Series 1000A, and B aircraft that are identified in Hawker Raytheon Corporate Jets Mandatory Service Bulletin SB 24-313 dated 19 December 1994. The requirement is to inspect the specified cable loom to ensure it is free from damage, which could lead to failures in the electrical systems. This directive was issued due to reports of damage caused by the flap selector spring strut, and the inspection serves as an early detection method to prevent potential failures. The obligations imposed by this directive are clear and specific. Aircraft operators must adhere to the inspection protocol outlined in the Hawker Raytheon Corporate Jets Mandatory Service Bulletin SB 24-313. This entails a thorough examination of the electrical cable loom behind the right-hand throttle box cover to identify any signs of damage. Operators must ensure that these inspections are completed before 31 July 1995, as stipulated by the directive. This compliance deadline underscores the urgency and importance of addressing potential electrical system failures to maintain the safety of the aircraft and its occupants. Failure to comply with the Airworthiness Directive AD/HS 125/147 can result in significant legal consequences. The Civil Aviation Safety Authority (CASA) has the authority to enforce penalties for non-compliance. The potential penalties may include fines and other regulatory actions that can impact the operation of the aircraft. It is imperative for operators to ensure adherence to the specified inspection requirements to avoid these adverse outcomes. The directive, having been classified as mandatory by the CAA(UK), highlights the critical nature of the compliance and the potential ramifications of neglecting this safety measure.