AD/AL 250/77 - Third Stage Turbine Wheel P/N 23001977

Overview

The Civil Aviation Regulations 1998, specifically Part 39, addresses aviation safety through the implementation of various airworthiness directives. One such directive, AD/AL 250/77, was introduced to address the safety issues associated with Allison Turbine Engines - 250 Series, particularly the third stage turbine wheel identified by Part Number 23001977. This directive was enacted to mitigate risks following reports of failures in the turbine wheels, which could potentially compromise the safety of the aircraft in operation. The Civil Aviation Safety Authority (CASA) issued this directive to ensure compliance with safety standards, reflecting advice from the engine manufacturer regarding the identified blade shroud failures. The objective is to ensure the safe operation of aircraft by removing the affected turbine wheels from service, thereby preventing potential accidents or incidents. The directive became effective on 2 February 1996, as per the requirement document, and mandates the removal of the specified turbine wheels in accordance with the manufacturer's guidance detailed in Allison Alert Commercial Engine Bulletin CEB A72-2176. This legislative instrument underscores the commitment of the Commonwealth of Australia to maintaining stringent aviation safety standards and ensuring that any identified safety risks are promptly addressed through regulatory action.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 106, addresses the scope and application of the Civil Aviation Safety Authority's (CASA) Schedule of Airworthiness Directives. This particular legislation targets all 250-C28 series engines fitted with a P/N 23001977 third stage turbine wheel, demanding their removal from service to ensure safety. The Act applies to aviation entities that operate aircraft equipped with the specified engine components, requiring them to comply with the directive to mitigate risks associated with identified safety issues. The requirement to remove these turbine wheels from service is effective from 2 February 1996, as detailed in the requirement document. This legislative instrument extends its reach to the entire Commonwealth of Australia, imposing mandatory compliance on all relevant aviation operators to maintain airworthiness standards and ensure passenger safety. There are no stated exclusions or exemptions in this directive, and compliance is strictly enforced to uphold aviation safety regulations.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 106, under the Civil Aviation Safety Authority (CASA) schedule of airworthiness directives, includes AD/AL 250/77, which pertains to the Allison Turbine Engines - 250 Series. The directive mandates the removal of certain third stage turbine wheels from service (section 1). This directive applies to all 250-C28 series engines that are equipped with a P/N 23001977 third stage turbine wheel (section 2). The requirement is to remove these applicable turbine wheels from service in accordance with Allison Alert Commercial Engine Bulletin CEB A72-2176 (section 3). Compliance with this directive must be achieved by 2 February 1996, as detailed in the requirement document (section 4). Entities and individuals governed by this directive are obligated to follow the specified instructions meticulously. This includes the prompt removal of the identified turbine wheels from service to prevent potential safety hazards. The directive requires adherence to the detailed instructions provided in the Allison Alert Commercial Engine Bulletin CEB A72-2176, ensuring that all steps are carried out correctly and in a timely manner. Failure to comply with these requirements may result in significant safety risks and potential regulatory repercussions. Failure to comply with the provisions of AD/AL 250/77 can lead to severe consequences. The Civil Aviation Regulations 1998 outline that non-compliance with airworthiness directives can result in various penalties and legal actions. In cases of breach, individuals or entities may face civil penalties, including fines and potential sanctions against their airworthiness certification. Furthermore, severe breaches could lead to criminal charges, where penalties may include imprisonment, reflecting the gravity of neglecting safety directives in aviation. The maximum penalties for such breaches are determined based on the severity of the non-compliance and the potential risk posed to aviation safety.