Overview

The Civil Aviation Regulations 1998, specifically in Part 39 - 105, address the need to ensure the safety and airworthiness of aircraft through the issuance of Airworthiness Directives (ADs). Enacted by the Civil Aviation Safety Authority (CASA), these regulations provide a framework for maintaining the safety standards of aviation operations within Australia. The Airworthiness Directive AD/HS 125/168, issued in March 2003, is an example of this regulatory approach, targeting the Hawker 800XP aeroplanes to mitigate the risk of engine overspeed by requiring specific modifications to the computer control switches. This directive aims to prevent the unawareness of loss of overspeed protection by the flight crew, which could lead to severe consequences such as engine overspeed and uncommanded engine shutdown. The CASA delegate’s role in issuing these directives underscores the commitment to enforcing safety measures and ensuring compliance with international standards.

Scope and Application

The Airworthiness Directive issued by the Civil Aviation Safety Authority (CASA) under subregulation 39.1(1) of the Civil Aviation Regulations 1998 applies specifically to model Hawker 800XP aeroplanes listed in Raytheon Service Bulletin SB 76-3480 dated August 2001. This directive mandates specific corrective actions to address identified safety concerns, particularly the installation of jumper wires on computer control switches to maintain the digital electronic engine control's overspeed protection function. The directive requires that these actions be completed within three months or 300 hours of the directive's effective date, whichever comes first, and became effective on 20 March 2003. This AD is part of a broader regulatory framework designed to enhance aviation safety by addressing potential unsafe conditions and ensuring compliance with safety standards. The directive's application is limited to the specified aircraft model and does not extend to other aircraft or aeronautical products unless similarly identified in other directives or service bulletins.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, include the Airworthiness Directive issued by the Civil Aviation Safety Authority (CASA) under subregulation 39.1 (1) (AD/HS 125/168). This directive applies to the Hawker 800XP aeroplanes as listed in Raytheon Service Bulletin SB 76-3480 dated August 2001. The directive mandates certain actions to ensure the safe operation of these aircraft. Owners and operators of Hawker 800XP aeroplanes must install a four-inch jumper wire between terminals 1 and 3 on the computer control switch "NF" and a six-inch jumper wire between terminals 1 and 3 on the computer control switch "NG". Additionally, the jumper wires must be tied and stowed using a tie-wrap. These actions are intended to ensure that the digital electronic engine control is powered when overspeed protection is selected, thereby preventing the loss of the overspeed protection function without the flight crew's awareness, which could lead to engine overspeed and potential uncommanded engine shutdown. The obligations imposed by this Airworthiness Directive include ensuring that the specified modifications are carried out within a specified timeframe. Operators must complete the installation of the jumper wires and their stowage within three months or 300 hours of time in service after the effective date of the directive, whichever comes first. This requirement ensures that the modifications are implemented promptly to maintain the airworthiness of the aircraft. Compliance with the directive is crucial for the safety of the aircraft and its passengers, as it addresses a significant safety concern. Failure to comply with this Airworthiness Directive can result in severe consequences. The regulations governing civil aviation in Australia include provisions for penalties for non-compliance with airworthiness directives. Such penalties can include fines, imprisonment, or both, depending on the severity of the non-compliance and its impact on aviation safety. The exact penalties are determined by the Civil Aviation Safety Authority and are enforced through the Civil Aviation Act 1988 and the Civil Aviation Regulations 1998. Ensuring adherence to these directives is essential for maintaining the high safety standards required in civil aviation.