AD/DHC-8/53 - Roll Disconnect System

Overview

The Civil Aviation Regulations 1998, as amended, incorporate specific airworthiness directives issued by the Civil Aviation Safety Authority (CASA) to ensure the safety of aviation operations within Australia. One such directive, AD/DHC-8/53, addresses the issue of uncommanded roll disconnects in Bombardier (Boeing Canada/De Havilland) DHC-8 Series aeroplanes. This directive was introduced to address the problem of reported incidents where the roll disconnect system of certain DHC-8 models experienced uncommanded disengagements during landing, which could compromise the safety of flight operations. The directive mandates the installation of Modification 8/2376, as specified in de Havilland Service Bulletin 8-27-79, Revision A, to rectify this issue and prevent potential safety hazards. CASA, as the relevant authority, established this directive to ensure compliance with safety standards and maintain the integrity of airworthiness for the specified aircraft models. The objective of AD/DHC-8/53, as stated in the directive, is to mitigate the risk associated with uncommanded roll disconnects by requiring an immediate modification to the affected aircraft. The directive applies to DHC-8 aircraft models 102, 103, 106, 201, 202, 301, 311, 314, and 315, with serial numbers 3 through 433. Compliance with this directive was required before 21 November 1998, with the directive becoming effective on 21 May 1998. This proactive approach by CASA aims to enhance the safety and reliability of the specified aircraft, ensuring that they meet the necessary airworthiness standards.

Scope and Application

The Civil Aviation Regulations 1998, under Part 39 - 105, issued by the Civil Aviation Safety Authority, apply to the specified Bombardier (Boeing Canada/De Havilland) DHC-8 series aeroplanes, including Models 102, 103, 106, 201, 202, 301, 311, 314, and 315, with serial numbers ranging from 3 to 433. This regulation is designed to ensure the airworthiness of these aircraft by mandating the installation of Modification 8/2376, as per de Havilland Service Bulletin 8-27-79, Revision A. Compliance with this directive is mandatory for all applicable aircraft, and the requirement must be fulfilled before 21 November 1998, with the directive becoming effective from 21 May 1998. This measure follows several reported incidents of uncommanded roll system disconnects during landing, which necessitated immediate safety improvements to maintain the operational safety standards of these aircraft within the Australian jurisdiction.

Key Provisions

The Civil Aviation Regulations 1998, particularly Part 39 - 105, addresses the Airworthiness Directives (AD) for specific aircraft models, including the Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes. The directive AD/DHC-8/53 pertains to the roll disconnect system, as outlined in section 1 of the legislation. This AD applies to DHC-8 aircraft, specifically Models 102, 103, 106, 201, 202, 301, 311, 314, and 315, with serial numbers ranging from 3 to 433. The primary requirement (section 2) is the installation of Modification 8/2376, in accordance with de Havilland Service Bulletin 8-27-79, Revision A. This installation must be completed before the compliance date of 21 November 1998, with the directive becoming effective on 21 May 1998. The directive notes that Transport Canada AD CF-98-04 also refers to this issue, highlighting international collaboration in addressing the safety concern. Operators of the specified DHC-8 aircraft must adhere to the obligations outlined in the AD (section 3). The most critical requirement is the installation of the specified modification to the roll disconnect system. This installation must be carried out by authorised personnel and in compliance with the relevant service bulletin and revision. Operators must ensure that all aircraft within the specified serial number range have the modification completed by the compliance date. Failure to meet this requirement may result in the aircraft being deemed non-airworthy, which could prevent operation until the modification is completed. The legislation includes provisions for enforcement and consequences in the event of non-compliance (section 4). Although the specific civil or criminal penalties are not detailed in the provided text, it is reasonable to infer that non-compliance with airworthiness directives could lead to significant repercussions. These might include fines, operational restrictions, or even grounding of the aircraft. Additionally, operators could face scrutiny or audits from the Civil Aviation Safety Authority (CASA), which may impose further penalties or corrective actions to ensure compliance. The seriousness of these consequences underscores the importance of adhering to the AD to maintain the safety and airworthiness of the aircraft.