Overview

The Civil Aviation Regulations 1998, enacted by the Australian Parliament, were introduced to regulate civil aviation safety in Australia, ensuring that aircraft and related products meet safety standards. This legislation provides the framework within which the Civil Aviation Safety Authority (CASA) operates, including the issuance of Airworthiness Directives (AD) to address specific safety concerns. The AD for Gates Learjet 35 and 36 Series Aeroplanes, issued in 2001, exemplifies how CASA implements these regulations by mandating specific actions to correct identified unsafe conditions. This particular AD was introduced following reports of tread separation in certain Goodyear main landing gear tyres, with the policy objective of ensuring that affected aircraft are inspected and any defective tyres are replaced before further flight to prevent potential safety hazards.

Scope and Application

This Airworthiness Directive issued under the Civil Aviation Regulations 1998 applies to all Model 35, 35A, 36, and 36A Learjet aircraft that are fitted with Goodyear main landing gear tyres with part number 178K23-5 and serial numbers ranging from 0148xxxx to 0152xxxx. The directive requires a visual inspection of these tyres to determine if any fall within the specified serial number range, with any affected tyres to be replaced before further flight. This applies nationally across Australia, as the Civil Aviation Regulations are administered by the Commonwealth of Australia. The requirement is to be completed before 28 May 2001, with the directive becoming effective on 23 May 2001. The directive does not apply to Goodyear tyres with the specified part number but outside the serial number range mentioned. The directive extends through the requirement to consult referenced advisory wires, service bulletins, and FAA and other ADs, indicating that the scope may be informed by additional regulatory materials and guidelines.

Key Provisions

The Civil Aviation Regulations 1998, under Part 39 - 105, include a specific Airworthiness Directive (AD) concerning the Gates Learjet 35 and 36 series aeroplanes, issued by the Civil Aviation Safety Authority (CASA). This AD, numbered AD/LEARJET 35/38, is focused on the main landing gear tyres of these aircraft models, specifically those bearing the Goodyear part number 178K23-5 within a certain serial number range (0148xxxx through 0152xxxx). The directive mandates that a visual inspection be conducted on these tyres to ascertain whether they fall within the specified serial number range (section 7/2001DM). The directive requires the inspection and replacement of any main landing gear tyres that match the Goodyear part number 178K23-5 and serial number range mentioned above, in accordance with Bombardier (Learjet) Advisory Wire 32-021, dated 5 February 2001. This action must be completed before the aircraft takes further flight, ensuring that any potentially defective tyres are replaced to maintain safety standards. The AD references FAA AD 2001-07-11 Amdt 39-12177 and Goodyear Service Bulletin GY SB 2001-32-001, providing additional context and supporting information for the directive. Entities governed by this AD, including aircraft operators and maintenance service providers, must adhere to the outlined requirements to ensure compliance. They must conduct the specified visual inspections, identify any tyres within the specified serial number range, and replace them as necessary before the aircraft is flown again. Failure to comply with these directives may result in safety risks and non-compliance with aviation safety regulations. Breach of the Airworthiness Directive could result in severe consequences, as it directly impacts the safety of the aircraft and its occupants. While specific penalties for non-compliance are not detailed in the AD, such breaches could lead to enforcement actions by CASA, which may include fines, suspension of airworthiness certificates, or other regulatory sanctions. The AD is effective from 23 May 2001, and compliance must be achieved by 28 May 2001, underscoring the urgency and importance of adhering to these safety requirements.