AD/DHC-1/36 - Flap Operating Cables

Overview

The Civil Aviation Regulations 1998, as amended, contain a series of legislative instruments designed to ensure the safety of civil aviation within Australia. Among these, F2006B09017 pertains specifically to the De Havilland DHC-1 (Chipmunk) series aeroplanes, focusing on the flap operating cables to prevent failures that could lead to hazardous situations, such as flap asymmetry during critical phases of flight. This directive was enacted to address a gap in safety protocols identified through reported incidents where inadequate maintenance and incorrect rigging of control cables had resulted in significant safety risks. The policy objective is to mandate regular and rigorous checks on the flap operating cables to maintain airworthiness and prevent future incidents. The regulations are enforced by the Civil Aviation Safety Authority (CASA), which is tasked with ensuring compliance with the airworthiness directives. The directive requires actions to be taken in accordance with British Aerospace Technical Notice CT(C1) No.184 Issue 2, and compliance must be achieved within specific timeframes and intervals to mitigate the risks associated with cable failures.

Scope and Application

The Civil Aviation Regulations 1998, specifically PART 39 - 105, applies to the De Havilland DHC-1 (Chipmunk) Series Aeroplanes, and more specifically to British Aerospace C1 (English production) aircraft. This legislation mandates compliance with British Aerospace Technical Notice CT(C1) No.184 Issue 2, as referenced by the UK Civil Aviation Authority's AD 001-03-95. The primary focus of this directive is the inspection and maintenance of the flap operating cables, given reported instances of cable failure leading to potential safety hazards during critical flight phases such as landing. Compliance requires that the specified maintenance actions be undertaken within 50 hours of time in service following 25 April 1995, and subsequently at intervals not exceeding twelve months or 150 hours of time in service, whichever comes first. This regulatory framework is integral to ensuring the airworthiness and safety of the specified aircraft, thereby impacting aircraft operators, maintenance personnel, and aviation safety authorities within the Commonwealth of Australia.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, under the Civil Aviation Safety Authority Schedule of Airworthiness Directives, addresses the maintenance and operation of De Havilland DHC-1 (Chipmunk) Series Aeroplanes. In this context, AD/DHC-1/36 pertains to the flap operating cables of British Aerospace C1 aircraft, which are of English production (section 1). The requirement mandates that the action taken must be in accordance with British Aerospace Technical Notice Service (TNS) CT(C1) No.184 Issue 2, and references UK Civil Aviation Authority AD 001-03-95 for further guidance (section 2). Compliance with these directives is critical to ensuring the safe operation of the aircraft. For British Aerospace C1 aircraft, compliance with AD/DHC-1/36 involves adhering to specific maintenance schedules for the flap operating cables. The directive requires that the action must be completed unless it has already been done within the preceding twelve months (section 3). The compliance timeline is set as follows: the action must be taken within 50 hours of time in service after 25 April 1995, or at intervals not exceeding twelve months, or 150 hours of time in service, whichever occurs first (section 4). This schedule ensures that the flap operating cables are regularly inspected and maintained to prevent failures, which could lead to hazardous situations such as flap asymmetry during critical phases of flight. The obligations imposed by the AD/DHC-1/36 are clear and must be followed by the operators of British Aerospace C1 aircraft. Operators are required to ensure that the flap operating cables are inspected and maintained according to the specified schedule. This includes verifying that the control cables are correctly rigged and the control pulleys are adequately maintained (section 5). These obligations are in place to mitigate the risk of cable failure, which has been linked to incidents of flap asymmetry during landing, potentially leading to accidents. Failure to comply with the AD/DHC-1/36 can result in serious consequences. The Civil Aviation Regulations 1998 impose penalties for non-compliance, which may include civil or criminal charges. The maximum penalties can be significant, reflecting the importance of adhering to these airworthiness directives. Non-compliance not only poses a risk to the safety of the aircraft but also to the passengers and crew on board, as well as to the general public. Ensuring adherence to these directives is thus a critical aspect of maintaining airworthiness standards and preventing accidents.