Overview

The Civil Aviation Regulations 1998 were enacted by the Australian Government to ensure the safety and efficiency of civil aviation in Australia. Part 39, in particular, focuses on airworthiness directives that address specific safety concerns for certain aircraft types. One such directive, AD/LEARJET/31, pertains to Gates Learjet 24 & 25 Series Aeroplanes, specifically targeting their handling qualities and aerodynamic stall characteristics. This directive was introduced to address issues identified by the Civil Aviation Safety Authority (CASA) and the Federal Aviation Administration (FAA) regarding undesirable handling characteristics at the limits of the flight envelope for certain serial numbers of these aircraft models. The policy objective is to enhance the safety and reliability of these aircraft by mandating modifications to their design, ensuring compliance with stringent airworthiness standards. The directive requires the installation of specific modification kits, either AMK 83-4 or AMK 84-5, for certain serial numbers of the Gates Learjet 24 & 25 Series. This requirement must be met before October 1, 1986, to ensure that the identified safety issues are effectively addressed. The directive is part of a broader regulatory framework aimed at maintaining high safety standards in the aviation industry, overseen by CASA to ensure compliance and protect public safety.

Scope and Application

The Civil Aviation Regulations 1998, specifically PART 39 - 105, addresses the safety and airworthiness requirements for certain aircraft models, particularly Gates Learjet 24 and 25 series aeroplanes. This regulation applies to specific serial numbers of these models, requiring modifications to ensure handling qualities and aerodynamic stall characteristics are within acceptable parameters. The requirement is to install either modification kit AMK 83-4 or AMK 84-5 on the specified aircraft to address the identified safety issues, with a compliance deadline set before 1st October 1986. The regulation's geographic and jurisdictional reach is governed by the Commonwealth of Australia, impacting all relevant aircraft within the national airspace. The regulation does not explicitly state exclusions, exemptions, or thresholds beyond the specified serial numbers, implying that all aircraft within the given serial number ranges must comply with the directive. The application of this legislation is further extended or restricted through subordinate instruments that may provide additional detail or clarification on implementation.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, contain an Airworthiness Directive (AD) that mandates modifications to the handling qualities and aerodynamic stall characteristics of certain Gates Learjet 24 and 25 series aeroplanes. The AD (AD/LEARJET/31) applies to specific serial numbers of these aircraft models, namely Gates Learjet 23 with serial numbers 23-003 to 23-099, Gates Learjet 24 with serial numbers 24-100 and subsequent, and Gates Learjet 25 with serial numbers 25-003 to 25-061, 25-067 to 25-201, and 25-204 and subsequent, equipped with unmodified wings (section 1). The directive requires the installation of either modification kit AMK 83-4 or modification kit AMK 84-5 to address identified undesirable handling characteristics at the flight envelope limits (section 2). The entities governed by this AD must adhere to the compliance timeline specified, which requires the modifications to be completed before 1 October 1986 (section 3). This timeline is crucial for ensuring that the identified safety concerns are addressed promptly, thereby enhancing the overall safety of the affected aircraft. Failure to comply with the AD may result in the aircraft being deemed unairworthy, which could lead to grounding and potential legal repercussions for the aircraft operators. In the event of non-compliance with the AD, there are potential civil and criminal consequences. The specific penalties are not detailed within the text provided, but typically, non-compliance with ADs under the Civil Aviation Regulations can result in fines, penalties, and potential legal action against the aircraft operator. The severity of the penalties may depend on the extent of non-compliance and any resulting safety incidents. The AD references FAA AD No 80-19-11 R1, indicating alignment with international standards and a collaborative effort between the Civil Aviation Safety Authority (CASA) and the Federal Aviation Administration (FAA) to address the identified safety concerns.