AD/LEARJET 35/25 - Flap Attachment Fittings

Overview

The Civil Aviation Regulations 1998, enacted by the Commonwealth of Australia, address various safety concerns in civil aviation, including the issuance of airworthiness directives. One such directive, AD/LEARJET 35/25, pertains specifically to Gates Learjet 35 and 36 Series Aeroplanes, aiming to address the issue of cracking in flap attachment fittings. This problem was identified in the service history of these aircraft models, which can lead to asymmetric flap conditions if left unaddressed. The directive requires inspections in accordance with Gates Learjet 35 S.B. 35/36-27-16, with compliance mandated within 200 hours of time in service after 30 September 1986. The overarching policy objective is to enhance the safety and reliability of civil aviation operations by ensuring that identified structural issues are rectified in a timely manner. The legislative instrument in question is a regulation under the Civil Aviation Act 1988, demonstrating the Australian Government's commitment to maintaining stringent safety standards. By setting forth specific requirements for the inspection and maintenance of Learjet 35 and 36 aircraft, the regulation aims to mitigate potential safety risks associated with flap attachment failures. This directive is part of a broader framework that seeks to ensure that all civil aviation activities within Australia adhere to high safety standards, thereby protecting both passengers and crew.

Scope and Application

The Civil Aviation Safety Authority Schedule of Airworthiness Directives under the Civil Aviation Regulations 1998, specifically AD/LEARJET 35/25, applies to all model Learjet 35 and 36 aeroplanes with serial numbers listed in the Requirement Document. This regulation mandates the inspection of flap attachment fittings in accordance with the Gates Learjet 35 Service Bulletin 35/36-27-16. Compliance with this directive is required within 200 hours of time in service after 30 September 1986. The directive's objective is to address the issue of flap attachment fitting cracking, which has been observed in service and could potentially lead to an asymmetric flap condition. This regulatory requirement is intended to enhance the safety of the aircraft by ensuring that the structural integrity of the flap attachment fittings is maintained throughout their operational life. The scope of this directive is limited to the specified Learjet models and serial numbers, and it extends to all operators within the Commonwealth of Australia.

Key Provisions

The Civil Aviation Regulations 1998, specifically under PART 39 - 105, mandate a schedule of airworthiness directives for certain aircraft, including Gates Learjet 35 and 36 Series Aeroplanes. This schedule is designed to ensure the safety and airworthiness of these aircraft by addressing specific issues that have arisen in service. One such directive, AD/LEARJET 35/25, pertains to flap attachment fittings on these models (section 39-105). This directive applies to all model Learjet 35 and 36 aircraft with serial numbers listed in the Requirement Document. The directive requires an inspection of the flap attachment fittings in accordance with Gates Learjet 35 S.B. 35/36-27-16, ensuring compliance within 200 hours of time in service after 30 September 1986 (section 39-105(1)). The obligations under this directive are clear and straightforward. Operators and owners of the affected Learjet 35 and 36 aircraft must ensure that the flap attachment fittings are inspected as per the specified bulletin, Gates Learjet 35 S.B. 35/36-27-16. This involves a thorough examination of the fittings to identify any signs of cracking, which is a known issue in these models. Failure to conduct this inspection within the stipulated timeframe of 200 hours of service post 30 September 1986 could result in the aircraft being deemed unairworthy, thereby preventing it from operating until the required inspection is completed and any necessary repairs are made (section 39-105(2)). Failure to comply with the requirements of this airworthiness directive may lead to serious consequences. Under the Civil Aviation Act 1988, non-compliance can be considered an offence. The Civil Aviation Regulations 1998 do not explicitly state the penalties for breaching these directives, but similar violations under the Act typically incur substantial fines and potential imprisonment for individuals, as well as fines for corporations. Additionally, the operator may face enforcement actions, including the suspension or revocation of the aircraft’s operating certificate, which would render the aircraft unable to fly until all regulatory requirements are satisfied (section 39-105(3)). Ensuring compliance with these directives is therefore not only a regulatory requirement but also a critical safety measure to prevent in-flight failures that could have dire consequences.