AD/LEARJET 35/1 - Primary Control System Stop Bolts - Inspection and Replacement

Overview

The Civil Aviation Regulations 1998, as amended through the legislative instrument F2006B11087, are pivotal in ensuring the safety and efficiency of civil aviation in Australia. This regulation, overseen by the Civil Aviation Safety Authority (CASA), addresses specific safety concerns related to aircraft maintenance and operational standards. The policy objective is to mandate rigorous inspection and replacement procedures for critical components, such as the primary control system stop bolts on Gates Learjet 35 and 36 Series Aeroplanes, to prevent mechanical failures and enhance aviation safety. By requiring compliance within a specified timeframe, the regulation aims to mitigate risks associated with aircraft operation and ensure that all aircraft meet stringent safety benchmarks. Enacted by the Parliament of Australia, this regulation targets a specific gap in the oversight of aircraft maintenance by setting clear directives for aircraft operators and maintenance personnel. The regulation applies to all Gates Learjet 35 models with serial numbers ranging from 35-001 to 35-039 and all Gates Learjet 36 models with serial numbers from 36-001 to 36-016. The primary focus is on ensuring that the primary control system stop bolts are inspected and replaced within 300 hours of time in service after 30 April 1976, as specified in document Gates Learjet SB 35/36-27-3. This targeted approach aims to address known vulnerabilities in the aircraft's structural integrity, thereby enhancing the overall safety of air travel.

Scope and Application

The Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998, specifically Part 39 - 105, issues an Airworthiness Directive (AD) concerning Gates Learjet 35 and 36 series aeroplanes. This AD applies to all Gates Learjet model 35 aeroplanes with serial numbers (S/Nos.) ranging from 35-001 to 35-039 and all Gates Learjet model 36 aeroplanes with S/Nos. from 36-001 to 36-016. The directive mandates the inspection and replacement of primary control system stop bolts as outlined in Gates Learjet Service Bulletin 35/36-27-3. Compliance with this directive is required within 300 hours of time in service after 30 April 1976, ensuring the safety and airworthiness of these aircraft. This AD operates under the Commonwealth of Australia, extending its regulatory reach across the nation, and is integral to maintaining safety standards within the civil aviation industry.

Key Provisions

The primary sections of the Civil Aviation Regulations 1998 that pertain to the Gates Learjet 35 and 36 Series Aeroplanes include sections that specify the applicability of the Airworthiness Directives (ADs), the required inspections, and the compliance timelines (section 39-105). These sections detail the need for inspection and, if necessary, replacement of the primary control system stop bolts in specified models and serial numbers of Gates Learjet aircraft. Specifically, all model 35 aeroplanes with serial numbers 35-001 to 35-039 and all model 36 aeroplanes with serial numbers 36-001 to 36-016 are covered by this directive. The obligations imposed by these regulations on the relevant parties include conducting a thorough inspection of the primary control system stop bolts as per the guidelines provided in Gates Learjet SB 35/36-27-3. This inspection must be carried out within a specified period: 300 hours of time in service following the directive's effective date of 30 April 1976. The directive requires that any stop bolts found to be defective or beyond their serviceable life must be replaced to ensure the continued airworthiness of the aircraft. Failure to comply with these Airworthiness Directives can result in significant legal consequences. The Civil Aviation Safety Authority (CASA) may take enforcement actions against operators or individuals who do not adhere to these requirements. Non-compliance could lead to enforcement actions, including fines, legal penalties, and potential grounding of the aircraft until the required inspections and repairs are completed. The specific penalties are not detailed in the excerpt but can be severe, reflecting the importance of maintaining the airworthiness of aircraft to ensure public safety.