AD/DC4/26 - Feathering Pump Line - Replacement

Overview

The Civil Aviation Regulations 1998, administered by the Civil Aviation Safety Authority (CASA) under the Civil Aviation Act 1988, were enacted to ensure the safety and efficiency of civil aviation in Australia. A specific legislative instrument, F2006B08832, amends the regulations to address safety concerns associated with the Douglas DC4 series aeroplanes. This particular amendment, AD/DC4/26, focuses on the replacement of the feathering pump line to mitigate risks associated with the original duralumin pump assembly. The policy objective is to enhance the safety of air travel by ensuring that critical components of aircraft are made from materials that are less prone to failure under operational conditions. The legislative instrument mandates the replacement of the duralumin pump assembly with 5/8 inch outside diameter x 18 SWG stainless steel or cadmium-plated chrome molybdenum tubing, as per ANOs Part 100, Appendix “A” Notice No. 22/6, or ANO 105.1.16.2.5.25, thereby addressing identified safety issues and maintaining the airworthiness of the aircraft. This proactive measure aligns with the overarching goal of the Civil Aviation Regulations 1998 to safeguard public safety and maintain the highest standards in civil aviation.

Scope and Application

The Civil Aviation Regulations 1998, under PART 39 - 105, pertains specifically to the safety directives governing civil aviation, including the application of Airworthiness Directives (ADs). This particular legislation applies to all models of Douglas DC4 series aeroplanes and mandates the replacement of the duralumin pump assembly with a specified type of stainless steel or cadmium plated chrome molybdenum tubing to enhance safety. This directive is enforced by the Civil Aviation Safety Authority and is applicable across the Commonwealth of Australia, ensuring a consistent standard of safety is maintained throughout the country's airspace. The directive does not specify any exclusions or exemptions, thereby applying universally to all relevant aircraft operators and entities within its jurisdiction. The authority to extend or restrict the application of these regulations is provided through subordinate instruments, allowing for adjustments and adaptations as necessary to meet evolving safety standards and technological advancements.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, include an Airworthiness Directive (AD) concerning the Douglas DC4 Series Aeroplanes, which is identified as AD/DC4/26. This AD mandates the replacement of the feathering pump line for all models of the Douglas DC4 Series. According to the directive (AD/DC4/26), the existing duralumin pump assembly (P/N 5229000), which runs from the propeller feathering pump to the firewall, must be removed and replaced with either 5/8 inch outside diameter x 18 SWG stainless steel tubing, or ANOs Part 100, Appendix “A” Notice No. 22/6, or ANO 105.1.16.2.5.25. This replacement is intended to address specific safety concerns associated with the original material or design of the pump line. The obligations imposed by this directive are clear and direct. Operators of Douglas DC4 Series aeroplanes must ensure that the specified replacement of the feathering pump line is carried out before further operation of the aircraft. This requirement is intended to maintain the airworthiness and safety standards of the aircraft in accordance with the regulations. The directive references specific types of materials and notices that must be adhered to, ensuring that the replacement parts meet the necessary safety and durability criteria. Failure to comply with the provisions of AD/DC4/26 can result in serious consequences. Operators found not to have replaced the feathering pump line as required may face enforcement actions under the Civil Aviation Regulations. The potential penalties for non-compliance could include fines, operational restrictions, or even the grounding of the aircraft until the required modifications are made. The exact penalties are not specified in the directive itself but may be determined by the Civil Aviation Safety Authority (CASA) based on the severity and impact of the non-compliance. Ensuring adherence to this directive is crucial to avoid any potential safety risks and legal repercussions.