AD/LEARJET 35/21 Amdt 1 - Engine Hydraulic Line Interference - Inspection

Overview

The Civil Aviation Regulations 1998 (Cth) were enacted to regulate civil aviation and ensure the safety and efficiency of aircraft operations within Australia. Specifically, Part 39 - 105 of the Civil Aviation Regulations includes the Civil Aviation Safety Authority's (CASA) Schedule of Airworthiness Directives, which aim to address safety concerns through mandatory compliance requirements. The directive AD/LEARJET 35/21Amdt 1, concerning Gates Learjet 35 and 36 series aeroplanes, was introduced to mitigate a problem identified in the interference between hydraulic lines and adjacent components in the tailcone area. This issue was highlighted in Gates Learjet Service Bulletins 35/36-29-1 and 35/36-29-2, and the directive mandates specific inspections to ensure compliance, with the overarching policy objective of enhancing aviation safety by addressing identified structural vulnerabilities.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, encompasses Airworthiness Directives for various aircraft, including the Gates Learjet 35 and 36 series aeroplanes. The legislation mandates compliance with Service Bulletins issued by the manufacturer, Gates Learjet, to address specific issues such as hydraulic line interference. The directive applies to all Gates Learjet 35 and 36 series aircraft, as outlined in the referenced service bulletins 35/36-29-1 and 35/36-29-2. Compliance is required within specific timeframes after designated dates, which are contingent on the aircraft's operational hours. The regulation ensures safety standards are met through required inspections and actions. This directive extends its reach across the Commonwealth of Australia, enforcing compliance nationally. The regulation does not explicitly mention any exclusions or exemptions, implying that all applicable aircraft must adhere to the directives outlined in the service bulletins. The regulation’s applicability is further detailed and potentially extended through subordinate instruments as necessary.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, outlines a series of airworthiness directives that ensure the safety and compliance of aircraft operations. Under this part, the directive AD/LEARJET 35/21 Amendment 1 addresses an important safety concern related to the Gates Learjet 35 and 36 series aeroplanes (Part 39 - 105). This directive mandates that all model 35 and 36 series aircraft must adhere to specific inspection requirements to mitigate the risk of interference between hydraulic lines and adjacent components in the tailcone area. The directive references Gates Learjet Service Bulletins 35/36-29-1 and 35/36-29-2, and also notes the FAA AD 83-08-3 for additional context (Part 39 - 105). The directive imposes clear obligations on aircraft operators and maintenance personnel. They must ensure that the specified inspections are conducted within 100 hours of time in service after 30 April 1983 and again within 100 hours of time in service after 30 September 1983 (Part 39 - 105). This requires meticulous record-keeping and adherence to the outlined timelines to maintain compliance. The directive also requires that the inspections are documented and recorded accurately in the aircraft's maintenance log, ensuring traceability and accountability (Part 39 - 105). Failure to comply with the provisions outlined in this airworthiness directive can result in serious consequences. Non-compliance may lead to civil penalties, including fines, as well as potential criminal charges if the non-compliance is deemed to have contributed to an aviation accident or incident. Additionally, the aircraft may be grounded until the necessary inspections are completed and any issues are resolved, leading to operational disruptions and financial losses for the operator (Part 39 - 105). The regulations are stringent, reflecting the critical nature of the safety issues addressed by this directive.