Overview

The Civil Aviation Regulations 1998, enacted by the Australian Parliament, provide the regulatory framework for civil aviation in Australia. Part 39, which includes the Civil Aviation Safety Authority Schedule of Airworthiness Directives, specifically addresses safety issues and compliance requirements for aircraft and engines. One such directive, AD/AL 250/47, pertains to Allison Turbine Engines - 250 Series, specifically targeting the replacement of the first stage turbine wheel P/N 6853306 to prevent failures. This directive applies to all 250-C20 and 250-B17 models and is based on the reference documents Allison 250-C20 CEB-1048 and Allison B17 TP CEB-1031. The policy objective is to enhance aviation safety by addressing known issues with turbine wheels that have resulted in overseas failures, ensuring compliance with safety standards to mitigate potential risks. The directive is a response to the need for stringent safety measures in the aviation industry, particularly concerning engine components that have shown a propensity for failure. By mandating the replacement of the specified turbine wheel, the legislation aims to proactively manage safety risks and maintain the airworthiness of affected aircraft models. The implementation of this directive is critical in upholding the high safety standards required by the Civil Aviation Safety Authority, thereby protecting both the aviation industry and the public.

Scope and Application

The Civil Aviation Safety Authority (CASA) has issued Airworthiness Directive (AD) AL 250/47, which applies to all 250-C20 and 250-B17 models of Allison turbine engines. The directive mandates the replacement of the first stage turbine wheel, specifically part number 6853306, to mitigate the risk of failures that have been observed overseas. The directive is applicable within the national jurisdiction of Australia and extends to all relevant aircraft operators, maintenance organisations, and individuals responsible for the operation and maintenance of the specified engine models. Compliance with this directive is essential and must be undertaken in accordance with the referenced documents: Allison 250-C20 CEB-1048 or Allison B17 TP CEB-1031. The directive does not specify any exclusions or exemptions, and its scope is limited to the identified engine models and the particular part in question. Further application and interpretation of this directive may be extended or clarified through subordinate instruments issued by CASA.

Key Provisions

The Civil Aviation Regulations 1998, specifically under Part 39 - 106, mandates the Civil Aviation Safety Authority (CASA) to issue Airworthiness Directives (AD) to ensure the safety and airworthiness of aircraft in operation. One such directive, AD/AL 250/47, pertains to the replacement of the first stage turbine wheel for Allison 250 Series engines, specifically those used in the 250-C20 and 250-B17 models (section 1). This directive is applicable to aircraft that reference either the Allison 250-C20 CEB-1048 or the Allison B17 TP CEB-1031 documents (section 1). Compliance with AD/AL 250/47 requires operators of affected aircraft to replace the first stage turbine wheel P/N 6853306 as per the instructions provided in the referenced documents (section 1). This directive aims to mitigate the risk of in-flight failures of the turbine wheel, which have been observed in similar engines overseas (section 1). Operators and owners of the affected aircraft must ensure that the specified maintenance action is carried out by qualified personnel and documented appropriately. The directive outlines the necessary steps for the replacement, which must be completed within the timeframe specified by CASA (section 1). Failure to comply with the requirements of this AD could result in the aircraft being deemed unairworthy, leading to potential grounding until the required maintenance is performed. The Civil Aviation Regulations 1998 impose significant obligations on operators and owners of aircraft subject to AD/AL 250/47. These obligations include conducting a thorough inspection of the affected turbine wheels, replacing the specified part if necessary, and ensuring that all maintenance actions are recorded in the aircraft's maintenance logbooks. Operators must also notify CASA of any non-compliance or delays in the implementation of the directive. Failure to adhere to the requirements of AD/AL 250/47 can result in severe consequences. CASA may issue enforcement actions, which could include fines, suspension or revocation of the aircraft's certificate of airworthiness, or even criminal charges in cases of gross negligence or willful disregard of safety regulations. The maximum penalties for non-compliance can include fines of up to $275,000 for corporations and $55,000 for individuals, reflecting the seriousness of ensuring air safety through compliance with ADs.