AD/AL 250/11 Amdt 3 - Engine Improvement - Introduction of Blue Ribbon Modifications

Overview

The Civil Aviation Safety Authority (CASA) introduced the Civil Aviation Regulations 1998 (Cth) to establish a regulatory framework for ensuring the safety of civil aviation in Australia. These regulations, particularly Part 39, address the issue of ensuring that aircraft and their components meet specific airworthiness standards to guarantee safe operations. One such specific regulation, AD/AL 250/11 Amendment 3, targets the Allison Turbine Engines - 250 Series, mandating the introduction of "Blue Ribbon" modifications to enhance engine reliability and safety. This amendment applies to all 250-C18 series engines and requires compliance with specified Allison Commercial Engine Bulletins or FAA AD 69-26-3. The primary objective is to ensure that these engines undergo necessary modifications at prescribed intervals to maintain their airworthiness, thereby contributing to the overarching policy goal of enhancing aviation safety in Australia. The Civil Aviation Regulations 1998, enacted by the Commonwealth of Australia, aim to provide a comprehensive regulatory environment for civil aviation safety. Specifically, Part 39 deals with Airworthiness Directives, which are crucial in maintaining the safety and airworthiness of aircraft and their components. Amendment 3 of AD/AL 250/11 focuses on the Allison Turbine Engines - 250 Series, requiring modifications to improve engine performance and reliability. This directive mandates that the engines must be modified according to the specified Allison Commercial Engine Bulletins or FAA AD 69-26-3 at designated intervals following their last overhaul or, if new, since they were first put into service. The underlying policy objective is to ensure that all regulated aircraft components adhere to stringent safety standards, thus fostering a safer aviation environment in Australia.

Scope and Application

The Civil Aviation Regulations 1998, specifically under Part 39 - 106, govern the application of Airworthiness Directives (AD) issued by the Civil Aviation Safety Authority (CASA). This particular legislation pertains to Allison Turbine Engines - 250 Series and mandates the introduction of "Blue Ribbon" modifications as outlined in AD/AL 250/11 Amendment 3. The directive applies to all 250-C18 series engines and requires compliance with specific Allison Commercial Engine Bulletins or FAA AD 69-26-3. Compliance involves modifying the engine at the next overhaul after 29 May 1970 but not later than 750 hours’ time in service since the last overhaul or since new if never overhauled. Additionally, the power and accessories gearbox must be modified at the next overhaul after 29 May 1970 but not later than 1125 hours’ time in service since the last overhaul or since new if never overhauled. The legislation extends its reach to any person or entity operating aircraft equipped with the specified Allison engines within Australian jurisdiction, ensuring that all aircraft maintain the requisite safety standards as dictated by the AD.

Key Provisions

The Civil Aviation Regulations 1998, Part 39, Section 106, specifically addresses the Allison Turbine Engines - 250 Series through AD/AL 250/11 Amendment 3, which introduces "Blue Ribbon" modifications for enhanced safety and performance. The applicability of these modifications is explicitly stated for all 250-C18 series engines (1). Compliance with these directives is to be achieved by following the Allison Commercial Engine Bulletins (CEBs) numbered 250 CEB 57 through 89, or the FAA AD 69-26-3, which detail the necessary modifications (1). These regulations impose specific obligations on the parties or entities involved, including the requirement to modify the engine at the next overhaul after 29 May 1970, but no later than 750 hours’ time in service since the last overhaul or since new if the engine has never been overhauled (1). Additionally, modifications to the power and accessories gearbox must occur at the next overhaul after 29 May 1970, but no later than 1125 hours’ time in service since the last overhaul or since new if the engine has never been overhauled (1). These obligations are clearly outlined to ensure that all modifications are performed within a defined timeframe to maintain airworthiness. Failure to comply with the provisions outlined in the AD/AL 250/11 Amendment 3 may result in serious consequences. Although specific penalties are not detailed within the text provided, non-compliance with Civil Aviation Regulations is generally subject to strict enforcement. Breaches of these regulations can lead to enforcement actions, which may include fines, penalties, or even grounding of the aircraft until compliance is achieved. The severity of the penalties underscores the importance of adhering to the stipulated modifications to ensure the continued airworthiness and safety of the aircraft.