AD/CA21/1 - Air Filter Box Rear Mounting Bracket

Overview

The Civil Aviation Regulations 1998 were enacted to establish the framework for ensuring the safety of civil aviation in Australia. Specifically, Part 39 - 105 Civil Aviation Safety Authority Schedule of Airworthiness Directives, such as AD/CA21/1, addresses issues related to the airworthiness of specific aircraft models. This particular directive pertains to the Skyfox Aviation (Calair/Hedaro) CA21 and CA22A series aeroplanes, focusing on the air filter box rear mounting bracket. The directive was introduced to mitigate the risk of pop rivets working loose and being ingested into the engine, which could compromise the safety of the aircraft. The policy objective is to ensure that the aircraft meet the required airworthiness standards by mandating the replacement of pop rivets with solid rivets, thereby reducing the risk of engine ingestion and enhancing overall flight safety. The directive was issued by the Civil Aviation Safety Authority under the authority of the Civil Aviation Act 1988.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, under the Civil Aviation Safety Authority's schedule of Airworthiness Directives, mandates the compliance of Skyfox Aviation (Calair/Hedaro) CA21 and CA22A series aeroplanes, particularly focusing on the air filter box rear mounting bracket. This regulation applies to CA22A aircraft and requires a detailed visual inspection of the rivets securing the air filter box rear mounting bracket. If the rivets are found to be loose, broken, or missing, they must be replaced with MS20470AD4-4 solid rivets. Additionally, the air filter box must be removed from the aircraft and the pop rivets securing the rear mounting bracket must also be replaced with either MS20470AD4-4 or MS20470AD5-4 solid rivets. Compliance for Requirement 1 must be achieved before the next flight after 4 January 1996, while Requirement 2 must be addressed at the next inspection for the issue of a Maintenance Release or within 100 hours of time in service, whichever comes first. This directive is essential to prevent the original pop rivets from working loose and potentially being ingested into the engine. The Skyfox Aviation Service Bulletin 9 Issue 2 is also referenced for additional guidance.

Key Provisions

The Civil Aviation Regulations 1998, specifically under PART 39 - 105, establish the Civil Aviation Safety Authority (CASA) Schedule of Airworthiness Directives for the Skyfox Aviation (Calair/Hedaro) CA21 and CA22A series aeroplanes. One of these directives, AD/CA21/1, pertains to the air filter box rear mounting bracket and outlines specific requirements to ensure the continued airworthiness of these aircraft (AD/CA21/1). The directive mandates a visual inspection of the rivets securing the air filter box rear mounting bracket. If these rivets are found to be loose, broken, or missing, they must be replaced with MS20470AD4-4 solid rivets (AD/CA21/1(1)). Additionally, the air filter box must be removed from the aircraft, and the pop rivets securing the rear mounting bracket must be replaced with either MS20470AD4-4 or MS20470AD5-4 solid rivets (AD/CA21/1(2)). The Civil Aviation Regulations impose several obligations on the parties and entities governed by the AD/CA21/1 directive. Firstly, it requires compliance with the inspection and replacement of rivets for the air filter box rear mounting bracket (AD/CA21/1). For Requirement 1, the inspection must be conducted before the next flight following 4 January 1996 (AD/CA21/1). For Requirement 2, the replacement of pop rivets must be performed at the next inspection for the issuance of a Maintenance Release or within 100 hours of time in service, whichever occurs first (AD/CA21/1). Additionally, the directive refers to Skyfox Aviation Service Bulletin 9 Issue 2 for further guidance on the implementation of these requirements (AD/CA21/1). Failure to comply with the provisions of AD/CA21/1 may result in civil or criminal consequences. The specific offences, penalties, or consequences for breach are not detailed within the text. However, under the Civil Aviation Act 1988, non-compliance with airworthiness directives can lead to enforcement actions, fines, and potential criminal charges. The maximum penalties for such offences can vary depending on the severity of the breach and the applicable legislation. It is essential for operators and maintenance personnel to adhere to these directives to ensure the continued safety and airworthiness of the Skyfox Aviation (Calair/Hedaro) CA21 and CA22A series aeroplanes.