AD/CA25/3 - Air Filter Box Rear Mounting Bracket

Overview

The Civil Aviation Regulations 1998, which form part of the legislative framework overseen by the Civil Aviation Safety Authority (CASA), were enacted to ensure the safety of civil aviation in Australia. Specifically, Part 39 - 105 of these regulations pertains to Airworthiness Directives (ADs), which are mandatory orders issued by CASA to address specific safety issues within the aviation industry. One such AD, AD/CA25/3, was introduced to address the risk of pop rivets in Skyfox Aviation (Hedaro) CA25 Series Aeroplanes becoming loose, breaking, or going missing, which could subsequently be ingested into the engine, posing a serious safety hazard. This AD was enacted to ensure compliance with safety standards by mandating the replacement of the pop rivets securing the air filter box rear mounting bracket with solid rivets, specifically MS20470AD4-4 or MS20470AD5-4, to mitigate this risk. The policy objective behind this regulation is to enhance the safety and reliability of civil aviation operations within Australia.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, pertains to the Civil Aviation Safety Authority's Schedule of Airworthiness Directives, which applies to all CA25 series aeroplanes operated by Skyfox Aviation (Hedaro). This regulation mandates the inspection and replacement of rivets in the air filter box rear mounting bracket of these aircraft to mitigate the risk of the pop rivets becoming loose and being ingested into the engine, which could result in significant safety hazards. The directive applies to all CA25 aircraft, necessitating a visual inspection of the rivets securing the air filter box rear mounting bracket and requiring their replacement if found loose, broken, or missing, with solid rivets of specified types. Compliance with these requirements is critical, with the initial inspection needed before further flight after 4 January 1996, and the replacement of pop rivets to be completed at the next inspection for the issue of a Maintenance Release or within 100 hours of time in service, whichever comes first. The regulation is enforced under the oversight of the Civil Aviation Safety Authority, ensuring adherence to stringent safety standards in civil aviation.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, includes a schedule of airworthiness directives pertinent to the Skyfox Aviation (Hedaro) CA25 Series Aeroplanes. This schedule mandates specific maintenance requirements to ensure the continued airworthiness of the aircraft, particularly focusing on the air filter box rear mounting bracket (AD/CA25/3). Section 1 of the directive requires operators to visually inspect the rivets securing the air filter box rear mounting bracket. If any of these rivets are found to be loose, broken, or missing, they must be replaced with MS20470AD4-4 solid rivets. Furthermore, Section 2 of the directive necessitates that the air filter box be removed from the aircraft and the pop rivets securing the rear mounting bracket replaced with either MS20470AD4-4 or MS20470AD5-4 solid rivets, in accordance with Skyfox Aviation Service Bulletin 9 Issue 2. Compliance with these requirements is crucial to maintaining the safety and airworthiness of the aircraft. For Requirement 1, the visual inspection and necessary replacement of rivets must be completed before any further flight after 4 January 1996. For Requirement 2, the replacement of the pop rivets with solid rivets must occur at the next inspection for the issuance of a Maintenance Release or within 100 hours of time in service, whichever comes first. These timelines are set to ensure that any potential issues with the mounting bracket are addressed promptly and do not compromise the safety of the aircraft. The background provided for this directive highlights the critical nature of the required actions. The original pop rivets fitted to the air filter box rear mounting bracket were prone to working loose, which could lead to these rivets being ingested into the engine. This could cause significant damage and potentially lead to engine failure. By mandating the use of solid rivets, the directive aims to mitigate this risk. The directive underscores the importance of adhering to specific maintenance protocols to prevent such incidents. Failure to comply with the requirements of this airworthiness directive can result in severe consequences. Operators who do not adhere to the mandated inspection and replacement procedures risk compromising the safety of their aircraft. Such non-compliance could lead to civil or criminal penalties, depending on the severity and intent of the breach. The maximum penalties for breaches of civil aviation regulations can include substantial fines and, in the case of criminal offences, imprisonment. It is therefore imperative that operators of Skyfox Aviation (Hedaro) CA25 Series Aeroplanes follow these directives meticulously to ensure both the safety of the aircraft and compliance with the law.