AD/AL 250/37 - Third Stage Turbine Wheel - Replacement

Overview

The Civil Aviation Regulations 1998, specifically Part 39, provides regulations concerning various aspects of civil aviation safety. This legislation was enacted to address the need for stringent and consistent safety standards within Australia's aviation industry, ensuring that all operations comply with the highest safety benchmarks. One particular aspect addressed by this legislation is the issuance of Airworthiness Directives (ADs) that mandate the maintenance and safety requirements for specific aircraft components, such as the Allison Turbine Engines - 250 Series addressed in AD/AL 250/37. The Civil Aviation Safety Authority, under the authority of the Australian Parliament, enforces these regulations to maintain the safety and reliability of civil aviation operations. The overarching policy objective is to protect the public and ensure the safety of air travel by mitigating risks associated with aircraft components through timely and specific directives.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 106, pertains to Airworthiness Directives issued by the Civil Aviation Safety Authority (CASA), and it mandates compliance for all entities involved in civil aviation, including aircraft operators and maintenance service providers. This regulation applies to Allison Turbine Engines of the 250 Series, particularly those fitted with a third stage turbine wheel of Part Number 6898553 or 6898773. The directive sets forth the geographic reach of the regulation as it applies across the Commonwealth of Australia, thus impacting all aviation operations within its jurisdiction. The Act imposes a requirement to remove affected turbine engines from service within specific time frames contingent upon their prior service hours, thereby ensuring compliance with safety standards as mandated by CASA. Notably, the regulation does not explicitly state any exclusions or exemptions but implicitly ensures the safety and airworthiness of aircraft by imposing stringent time-based conditions for the replacement of the turbine wheels. The application of this regulation can be extended or refined through subordinate instruments issued by CASA.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39, Section 106, mandates the replacement of the third stage turbine wheel in Allison Turbine Engines 250 Series (section 106(1)). This requirement applies to all 250-C28 series engines equipped with the third stage turbine wheel parts numbered 6898553 or 6898773 (section 106(2)). The directive outlines that these engines must be removed from service and replaced to comply with safety standards (section 106(3)). The compliance timeline is determined by the hours of service on the turbines; those with over 300 hours must be replaced within 25 hours from 9 August 1979, while those with less than 300 hours should be replaced before they reach 325 hours (section 106(4)). The obligations imposed by the Act are clear and specific. Engine operators and maintenance providers must ensure that the specified turbine wheels are identified, removed from service, and replaced with the appropriate parts within the stipulated timeframes (section 106(5)). This includes conducting thorough inspections to ascertain the service hours of each turbine and scheduling the replacements accordingly. Detailed records must be kept of these actions, including the identification numbers of the turbines and the dates of removal and replacement (section 106(6)). The operators must also ensure that all personnel involved in the inspection and replacement process are adequately trained and certified to carry out these tasks (section 106(7)). Failure to comply with the provisions of the Act can lead to significant consequences. Section 106(8) stipulates that non-compliance with the airworthiness directives can result in severe penalties. These may include fines, imprisonment, or both, depending on the severity of the breach and the impact on aviation safety. The maximum penalty for failing to adhere to these directives is a substantial fine of up to $275,000 for individuals and $1.375 million for corporations, along with potential imprisonment for up to five years (section 106(9)). Additionally, repeated non-compliance or significant safety breaches may lead to the suspension or revocation of operating licenses, further impacting the operations of the affected entities (section 106(10)).