AD/CL-600/23 Amdt 1 - Brakes

Overview

The Civil Aviation Regulations 1998, established by the Australian Parliament, serve to maintain and enhance aviation safety across the nation. This legislation, particularly under PART 39 - 105, addresses specific airworthiness directives to mitigate identified safety risks. One such directive is AD/CL-600/23 Amendment 1, introduced to address the problem of tyre bursts on Bombardier (Canadair) CL-600 (Challenger) Series aeroplanes during landings on contaminated surfaces. The policy objective of this directive is to reduce the likelihood of frozen brakes by mandating the installation of inboard wheel discs, water shields, water deflectors, and trailing arm sealing caps, as applicable. This amendment was enacted in response to a revision of the related Transport Canada Airworthiness Directive, ensuring alignment with international safety standards and providing a robust framework for compliance within the specified timeline.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, mandate the application of Airworthiness Directives concerning Bombardier (Canadair) CL-600 (Challenger) series aeroplanes. This regulation applies to specific models and serial numbers of the CL-600-1A11 and CL-600-2A12 aircraft, requiring the installation of inboard wheel discs, water shields, water deflectors, and trailing arm sealing caps to mitigate the risk of frozen brakes. The requirement is to be implemented in accordance with the specified Canadair Service Bulletins and must be completed within 300 hours of service after 5 November 1998. Notably, the removal of these components is permissible if the aircraft does not take off from a wet runway where the ambient temperature is below 10 degrees Celsius, with specific procedures outlined in the Aircraft Flight Manual and referenced Canadair drawings and service bulletins. This directive aims to address tyre burst incidents on landing from contaminated surfaces, aligning with the Transport Canada AD CF-84-04R2. The regulation's scope is thus confined to the specified aircraft models and serial numbers, ensuring compliance with safety directives to enhance operational safety.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39, Section 105, outlines the Civil Aviation Safety Authority's (CASA) schedule of airworthiness directives, which includes detailed requirements for specific aircraft models. In this case, Airworthiness Directive (AD) AD/CL-600/23 Amendment 1 pertains to Bombardier (Canadair) CL-600 (Challenger) Series Aeroplanes, specifically models CL-600-1A11 and CL-600-2A12, covering a range of serial numbers (Section 12/98). The directive mandates the installation of inboard wheel discs, water shields, water deflectors, and trailing arm sealing caps for CL-600-2A12 aircraft to mitigate the risk of frozen brakes, a safety concern identified in previous incidents (Section 1). Operators must follow detailed instructions outlined in the relevant Canadair Service Bulletins (SB 600-0369 Revision 3 for CL-600-1A11 and SB 601-0024 Revision 2 for CL-600-2A12) to complete the installation. Operators of these aircraft are required to comply with specific conditions set out in the directive. They must ensure the installation of the specified components within 300 hours of time in service after 5 November 1998, unless the installations were already completed (Section 1). It is permissible to remove the inboard and/or outboard wheel discs under certain conditions, such as when the aircraft will not take off from a wet runway where the ambient temperature is below 10 degrees Celsius, as per the Aircraft Flight Manual Limitations section (Configuration Deviation List). The removal and reinstallation of these discs must adhere to the instructions provided in the Canadair Drawings K600-85022 or the relevant Service Bulletins (SB 600-0662 for CL-600-1A11 and SB 601-0467 for CL-600-2A12) (Section 1). The AD also references Transport Canada AD CF-84-04R2, which provides additional context and background on the safety issues addressed by this directive. Failure to comply with the requirements of this AD can result in serious safety risks, including the potential for tyre bursts on landing, particularly when operating from contaminated surfaces (Section 1). Operators must ensure that all modifications and compliance actions are completed within the stipulated timeframe to maintain the airworthiness of the aircraft. Non-compliance with the provisions of this Airworthiness Directive can lead to significant consequences. Operators found in breach of the AD may face enforcement actions under the Civil Aviation Act 1988, including fines and potential criminal charges (Section 1). The specific penalties for non-compliance are determined by the severity of the breach and the impact on aviation safety. In severe cases, non-compliance can result in the grounding of the affected aircraft until the required modifications are completed, which could disrupt flight operations and lead to financial losses for the operator. It is essential for operators to adhere strictly to the requirements of the AD to avoid these adverse outcomes and ensure the continued safety of their operations.