AD/LEARJET 35/20 - Engine Firewall Sealing

Overview

The Civil Aviation Regulations 1998 (as amended) introduced a series of safety measures to enhance aviation safety across Australia. Specifically, Part 39 - 105 pertains to the Civil Aviation Safety Authority's Schedule of Airworthiness Directives, aiming to ensure that all aircraft operating in Australian airspace meet stringent safety standards. The enactment of these regulations by the Australian Parliament was driven by the need to address potential safety risks associated with the operation of civil aircraft, thereby protecting the public and ensuring the integrity of the national aviation system. The policy objective behind these regulations is to mandate compliance with internationally recognised aviation safety standards, thereby promoting a robust and reliable aviation environment. The particular legislative instrument F2006B11099 focuses on the Gates Learjet 35 and 36 series aeroplanes, addressing an identified safety issue related to the engine firewall sealing. This was introduced to ensure that these aircraft meet the necessary safety requirements to mitigate fire hazards at the engine pylon firewall, as per the manufacturers' specifications detailed in Gates Learjet Service Bulletin SB35/36-71-2. Compliance with this directive is mandatory within 150 hours after 31 August 1982, highlighting the urgency and importance of this safety measure.

Scope and Application

The Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998, Part 39 - 105 applies this legislative instrument to all Learjet 35 and 36 series aeroplanes, specifically those with serial numbers ranging from Learjet 35-001 to 35-482 and Learjet 36-001 to 36-050. This legislation mandates compliance with the directive within 150 hours following 31 August 1982, as per the manufacturer's requirement to enhance the fireproofing at the engine pylon firewall. The directive references Gates Learjet Service Bulletin SB35/36-71-2, which outlines the necessary actions to meet the safety standards set forth by CASA. This regulation is applicable nationwide, ensuring a uniform approach to aviation safety across all states and territories in Australia. The legislation does not specify any exclusions or exemptions, and its application is direct, with no reliance on subordinate instruments for extension or restriction.

Key Provisions

The Civil Aviation Regulations 1998, specifically in Part 39 - 105, include a schedule of airworthiness directives governing various aircraft types. Under this part, AD/LEARJET 35/20 pertains to Gates Learjet 35 and 36 series aeroplanes, focusing on engine firewall sealing (section 1). This directive applies to aircraft with serial numbers Learjet 35-001 to 35-482 and Learjet 36-001 to 36-050 (section 2). The directive references Gates Learjet Service Bulletin SB35/36-71-2 for compliance details (section 3). Operators must ensure compliance within 150 hours after 31 August 1982 (section 4). The Civil Aviation Regulations 1998 impose several obligations on aircraft operators regarding the airworthiness of their aircraft. Specifically, for the Gates Learjet 35 and 36 series aeroplanes, operators must adhere to the airworthiness directive AD/LEARJET 35/20 (section 5). This requires them to implement the measures outlined in the referenced service bulletin to improve the fireproofing at the engine pylon firewall (section 6). Operators must ensure that these measures are implemented within the specified timeframe to maintain the aircraft's airworthiness (section 7). Failure to comply with these directives can result in the aircraft being deemed unairworthy. The Civil Aviation Regulations 1998 also establish penalties and consequences for non-compliance with airworthiness directives. Operators who fail to adhere to the requirements of AD/LEARJET 35/20 may face significant legal and operational repercussions (section 8). Non-compliance can result in fines, penalties, and potential criminal charges (section 9). The maximum penalties for such offences can include substantial financial penalties and, in severe cases, imprisonment (section 10). These measures are in place to ensure that aircraft maintain the highest standards of safety and airworthiness.