AD/PA-44/16 - Ailerons

Overview

The Civil Aviation Regulations 1998 were enacted by the Australian Parliament to ensure the safety and efficiency of civil aviation within Australia. One such regulation, AD/PA-44/16, was introduced to address the problem of cracking in the aileron nose ribs and hinge brackets of Piper PA-44 (Seminole) series aeroplanes, particularly those that have exceeded 2000 hours in service since new. The policy objective behind this Airworthiness Directive is to mitigate the risk of structural failure by mandating the removal, inspection, and, if necessary, replacement of the ailerons, thereby ensuring the continued airworthiness of the affected aircraft. Compliance with this directive is required at the next maintenance inspection after 9 November 1995, and subsequently at intervals not exceeding 500 hours of operational time. The Civil Aviation Safety Authority, under the authority of the Civil Aviation Act 1988, issued this directive to enhance aviation safety and prevent potential in-flight failures that could result from undetected aileron damage. By enforcing regular inspections and necessary repairs, the directive aims to maintain high safety standards and protect both the aircraft and its occupants.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, pertain to the Piper PA-44 (Seminole) series aeroplanes and their airworthiness directives. This legislation applies to all models of the Piper PA-44 aeroplane series that have accumulated more than 2000 hours of service since they were new. The regulations mandate the removal and subsequent inspection of the left and right hand ailerons to check for any signs of cracking in the nose ribs and hinge brackets, followed by the reinstallation of the ailerons after any necessary repairs. Compliance with these directives is required at the next scheduled maintenance inspection following 9 November 1995, and subsequently at intervals not exceeding 500 hours of service. The directive responds to multiple reports of aileron cracking in the Piper PA-44 series, even in aircraft with low total service hours, thereby aiming to ensure continued airworthiness and safety of these aircraft. The application of these regulations is enforced within the national jurisdiction of Australia, overseen by the Civil Aviation Safety Authority.

Key Provisions

The Civil Aviation Regulations 1998, particularly Part 39 - 105, impose specific requirements for the airworthiness of Piper PA-44 (Seminole) series aeroplanes. Under this legislation, as detailed in AD/PA-44/16, the primary focus is on the aileron components of these aircraft. Section 1 states that all models of the Piper PA-44 series that have exceeded 20,000 hours of time in service since new are subject to these directives. The main requirement outlined in section 2 is to remove both the left and right ailerons from the aircraft. Following their removal, a detailed visual inspection must be conducted on the nose ribs and hinge brackets of each aileron to check for any signs of cracking. Section 3 instructs that after inspection or necessary rectification, the ailerons must be reinstalled. The compliance timeline is set out in section 4, which mandates that these checks and rectifications must be performed at the next inspection for maintenance release issue after 9 November 1995 and subsequently at intervals not exceeding 500 hours of time in service. The obligations imposed by this legislation are clear and stringent. Operators of Piper PA-44 series aeroplanes must ensure that the aileron components are regularly inspected and maintained in accordance with the specified intervals. This involves not only the removal and reinstallation of the ailerons but also conducting a thorough visual inspection of the nose ribs and hinge brackets to detect any signs of wear or damage. Failure to comply with these requirements could lead to significant safety risks, as evidenced by the background information provided, which notes recent reports of cracking in these components on low time aircraft. Thus, operators must strictly adhere to the timelines and inspection procedures outlined in the regulations to maintain the airworthiness of their aircraft. In terms of the consequences of non-compliance, while specific penalties are not outlined in the provided text, the potential risks are substantial. Non-compliance with these airworthiness directives could result in serious safety issues, including possible in-flight failures of the aileron components. Such failures could lead to significant safety hazards, potentially resulting in accidents. Additionally, failure to adhere to these regulations could lead to enforcement actions by the Civil Aviation Safety Authority (CASA). This could include fines, suspension of the aircraft’s certificate of airworthiness, or other regulatory penalties. While the exact penalties are not detailed in the provided text, the implications of failing to comply with these airworthiness directives are serious, underscoring the importance of strict adherence to the specified requirements.