AD/RRT-S/11 - Steel Turbine Discs

Overview

The Civil Aviation Regulations 1998, enacted by the Parliament of Australia, encompass a broad framework governing various aspects of civil aviation in the country, including the safety and maintenance of aircraft. The Rolls-Royce Turbine Engines - Spey Series AD/RRT-S/11 Steel Turbine Discs directive is one such regulation within Part 39 of the Civil Aviation Regulations, specifically aimed at ensuring the airworthiness of aircraft equipped with Rolls-Royce Spey series engines. The directive was introduced to address safety concerns associated with low cycle fatigue cracks originating from corrosion pits in steel turbine discs, which can compromise engine performance and flight safety. The policy objective is to mandate inspections of the steel turbine discs of Spey series engines that have completed at least 40% of their published service life, as outlined in Rolls-Royce Service Bulletin Sp72-1044, to ensure they meet specified safety standards. The directive requires compliance during the next engine shop visit scheduled for either a low pressure or high pressure turbine overhaul, with an effective date of 10 December 1992. This regulation is enforced by the Civil Aviation Safety Authority (CASA) to maintain high safety standards within the aviation industry, ensuring that aircraft operations do not pose undue risks due to mechanical failures stemming from turbine disc issues.

Scope and Application

The Civil Aviation Regulations 1998, as amended, under Part 39 - 106, specifically address the airworthiness directives related to Rolls Royce Turbine Engines of the Spey Series, focusing on the inspection of steel turbine discs. This directive applies to any Spey series engines that meet the criteria outlined in Rolls Royce Service Bulletin Sp72-1044, ensuring these engines adhere to specified safety standards. Compliance with this directive is mandatory and must be observed at the next engine shop visit where either a low pressure or high pressure turbine overhaul is scheduled, with an effective date of 10 December 1992. The directive targets engines that have completed at least 40% of their published service life, aiming to inspect steel turbine discs for low cycle fatigue cracks that may originate from corrosion pits, thereby maintaining the integrity and safety of civil aviation operations.

Key Provisions

The Civil Aviation Regulations 1998, under Part 39 - 106, includes an Airworthiness Directive (AD) for Rolls Royce Turbine Engines of the Spey series. Specifically, AD/RRT-S/11 pertains to steel turbine discs. This directive mandates that steel turbine discs which have completed at least 40% of their published service life must be inspected during the next engine shop visit where either a low pressure turbine or a high pressure turbine overhaul is scheduled (Section 13/92). This requirement is intended to address issues of low cycle fatigue cracks originating from corrosion pits, as evidenced in some Spey steel turbine discs. Entities governed by this directive must comply with the action specified in Rolls Royce Service Bulletin Sp72-1044. This compliance is crucial to ensure the continued airworthiness of the aircraft using these engines. The directive became effective on 10 December 1992, and it mandates that the inspection must be carried out during the next scheduled overhaul of the turbines. The directive ensures that any potential issues are identified and rectified, thereby maintaining the safety and reliability of the aircraft. Failure to comply with the AD/RRT-S/11 could result in severe consequences. The regulations do not explicitly state offences or penalties within the text provided; however, non-compliance with airworthiness directives can typically lead to serious regulatory action. This could include fines, sanctions against the air operator or maintenance organisation, and potentially grounding of the aircraft until compliance is achieved. The severity of the penalties may vary based on the level of non-compliance and the risk posed to aviation safety. It is imperative for all stakeholders to adhere strictly to the requirements to avoid these potential repercussions.