AD/BAe 146/38 - Generator Control Unit (GCU) Replacement

Overview

The Civil Aviation Regulations 1998, amended through legislative instrument F2006B03488, address specific safety concerns related to the British Aerospace BAe 146 Series Aeroplanes. Enacted by the Commonwealth of Australia, this regulation targets a particular problem identified with the Generator Control Unit (GCU) of these aircraft. The Civil Aviation Safety Authority issued an Airworthiness Directive (AD/BAe 146/38) to mandate the replacement of the GCU, following concerns raised by BAe that a failure in detecting a single phase feeder line open circuit could result in inaccurate instrument readings. This directive aims to ensure the continued safety and airworthiness of the BAe 146 Series aeroplanes by implementing corrective measures as specified in the requirement document and ensuring compliance with the BAe 146 Mandatory Alert Service Bulletin 24-A97, prior to 17 November 1991. This legislative action by the Australian government through the Civil Aviation Safety Authority reflects a commitment to maintaining stringent safety standards in the aviation industry. The policy objective is clear: to prevent potential safety hazards associated with the identified GCU defect, thereby safeguarding the integrity of flight operations and ensuring the protection of passengers and crew. The directive is a proactive measure to address a specific vulnerability within the BAe 146 Series aeroplanes, ensuring that all affected aircraft meet the required safety benchmarks and standards.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105 concerning the Civil Aviation Safety Authority Schedule of Airworthiness Directives, applies to the British Aerospace BAe 146 Series Aeroplanes. This legislation mandates the replacement of the Generator Control Unit (GCU) as outlined in Airworthiness Directive AD/BAe 146/38. The directive is applicable to aircraft that were in service prior to 17 November 1991 and requires compliance with the instructions provided in BAe's Mandatory Alert Service Bulletin 24-A97. The regulation aims to address safety concerns related to the potential failure of the GCU to detect an open circuit in a single phase feeder line, which could result in inaccurate instrument readings. This directive applies nationwide within Australia, ensuring that all relevant aircraft within the country must adhere to the specified safety standards and maintenance requirements to mitigate any risks associated with GCU failure. There are no stated exclusions or exemptions mentioned in the directive itself, though the scope and specific application details are determined by the referenced requirement document and service bulletin.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, detail the Civil Aviation Safety Authority (CASA) Schedule of Airworthiness Directives (AD) for the British Aerospace BAe 146 Series Aeroplanes. Within this, AD/BAe 146/38 outlines the requirements for the replacement of the Generator Control Unit (GCU). This directive is applicable as specified in the requirement document and necessitates action in accordance with BAe 146 Mandatory Alert Service Bulletin 24-A97 (Section 1/92TX). The directive mandates that compliance must be achieved prior to 17 November 1991. The background information provided by BAe indicates that failure of the affected GCUs to detect a single phase feeder line open circuit may result in inaccurate instrument readings, which poses a safety risk. Under the AD/BAe 146/38, the obligations imposed on the parties or entities governed by this directive are clear and specific. Operators of the BAe 146 Series Aeroplanes must ensure that the GCU is replaced as per the service bulletin. This involves identifying the specific aircraft that fall within the scope of the directive and conducting the necessary maintenance actions to replace the GCU. The directive emphasises the importance of adhering to the specified timeline, ensuring that the compliance is achieved before the stipulated date of 17 November 1991. This requirement is critical to maintain the airworthiness of the aircraft and to ensure the safety of all passengers and crew on board. Failure to comply with the provisions of AD/BAe 146/38 may result in serious legal consequences. The Civil Aviation Regulations 1998 outline various offences and penalties for non-compliance with airworthiness directives. The maximum penalties for such breaches can be substantial, reflecting the importance of adhering to safety standards. Civil penalties may include fines, while criminal penalties can result in imprisonment. These consequences underscore the gravity of ensuring that the GCU replacement is carried out in accordance with the directive, as failure to do so not only risks the safety of the aircraft but also exposes the operators to significant legal repercussions. In summary, AD/BAe 146/38 under the Civil Aviation Regulations 1998 mandates the replacement of the Generator Control Unit in BAe 146 Series Aeroplanes to prevent inaccurate instrument readings resulting from a single phase feeder line open circuit. Operators must ensure that this action is completed prior to the specified date of 17 November 1991. Non-compliance with this directive carries serious legal and safety implications, including potential fines and imprisonment. The directive is a critical measure to maintain the airworthiness and safety of the aircraft in accordance with the stringent standards set by CASA.