AD/ML-M4/7 - Aileron Control System - Modification

Overview

The Civil Aviation Regulations 1998, as amended, govern the safety and operational standards of civil aviation in Australia, with Part 39 specifically addressing airworthiness directives. One such directive is AD/ML-M4/7, which was introduced to address a safety issue with the aileron control system in Maule M-4 Series Aeroplanes. This directive was enacted by the Civil Aviation Safety Authority to ensure the safe operation of these aircraft by requiring modifications to the aileron control system. The policy objective is to enhance aircraft safety and reliability by rectifying a potential failure point in the aileron control mechanism, thereby reducing the risk of in-flight malfunctions. Compliance with this directive is mandatory for all Maule M-4 Series Aeroplanes, requiring the specified modifications within 25 hours of time in service after 1 October 1969.

Scope and Application

The Civil Aviation Safety Authority Schedule of Airworthiness Directives under the Civil Aviation Regulations 1998 applies to all models of Maule M-4 series aeroplanes, specifying modifications required to ensure compliance with airworthiness standards. This directive mandates the removal of the bolt attaching the most forward aileron control system pulley to the control column and its replacement with a pulley assembly that includes specific washers and a bolt in a prescribed sequence. Compliance with these modifications must be achieved within 25 hours of time in service after 1 October 1969, ensuring that all Maule M-4 series aeroplanes meet the necessary safety standards set by the Civil Aviation Safety Authority. The regulation applies nationally within Australia, governed by the Commonwealth, and does not explicitly exclude any entities or models from its scope. The directive's requirements are enforced through the Civil Aviation Regulations 1998, and any further specifications or amendments may be detailed in subordinate instruments issued by the Civil Aviation Safety Authority.

Key Provisions

The Civil Aviation Regulations 1998, particularly Part 39 - 105, focuses on airworthiness directives for specific aircraft models, including the Maule M-4 Series Aeroplanes, with AD/ML-M4/7 detailing the modification required for the aileron control system. This directive mandates the removal of the bolt that attaches the most forward aileron control system pulley to the control column and requires the replacement of the pulley assembly with specific washers and a bolt (sections 10/69). The sequence of components from front to rear must include: AN5-27 Bolt, AN970-5 Washer, AN960-516 Washer, the original pulley, the control column, another AN960-516 Washer, and an AN365-524 Nut. This compliance must be achieved within 25 hours of time in service after 1 October 1969. The obligations imposed by this airworthiness directive are clear and specific. All operators of Maule M-4 Series Aeroplanes must ensure that the modification to the aileron control system is completed as outlined in AD/ML-M4/7. This includes the precise sequence of washers and bolts to maintain the structural integrity and safety of the aircraft. Failure to adhere to these specifications could result in non-compliance with regulatory standards, potentially compromising the safety and airworthiness of the aircraft. Operators are expected to meticulously follow the prescribed steps to avoid any discrepancies in the assembly process. Breach of these airworthiness directives can lead to serious consequences. The Civil Aviation Safety Authority (CASA) enforces compliance strictly, and failure to adhere to the stipulated modifications can result in penalties. While the specific penalties are not detailed in the provided text, non-compliance generally leads to enforcement actions, including but not limited to, fines, operational restrictions, or grounding of the aircraft until the required modifications are completed. Additionally, there may be civil or criminal liability for any resultant accidents or incidents traced back to non-compliance with these directives. Therefore, it is imperative for all operators to meticulously follow the requirements to avoid any legal or safety repercussions.