AD/RRT-S/8 - Combustion Section - Primary Airscoop

Overview

The Civil Aviation Regulations 1998, specifically within Part 39 - 106, outlines the Civil Aviation Safety Authority's Schedule of Airworthiness Directives, which includes AD/RRT-S/8 concerning Rolls Royce Turbine Engines of the Spey Series. Enacted to address the safety concerns related to primary air scoop failures in specified Rolls Royce engines, this directive ensures compliance with Rolls Royce S.B. Sp 72-997, which mandates an improved standard for the overhaul of primary air scoops. This was introduced following an incident where a primary air scoop failure led to flame penetration, highlighting the need for stringent safety measures. The objective of this directive is to mitigate such risks by requiring compliance at the next engine overhaul or when the engine is disassembled sufficiently to allow access to the primary air scoops. The regulation was enacted by the Australian Government through the Civil Aviation Safety Authority, aiming to maintain and enhance aviation safety standards. The policy objective is to ensure that the specified Rolls Royce engines are maintained to a standard that prevents similar incidents in the future, thereby safeguarding the integrity and safety of civil aviation operations.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 106, pertain to the Airworthiness Directives issued by the Civil Aviation Safety Authority. This regulation applies to certain Rolls Royce turbine engines, namely those of the Spey Series, including the models SPEY 506-14, 506-14A, 506-14D, 511-5W, 511-8, 511-14, 511-14W, 512-14E, 512-14DW, 512-5, 512-5W, 555-15, 555-15H, 555-15N, and 555-15P. The directive mandates compliance with Rolls Royce S.B. Sp 72-997, which addresses an improved standard for the overhaul of primary air scoops. Compliance with this directive is required at the next engine overhaul or when the engine is disassembled sufficiently to allow access to the primary air scoops. This directive follows an incident where a failure in the primary air scoop led to flame penetration of the engine’s major casings and the engine cowling. The regulation’s jurisdictional reach is across the Commonwealth of Australia, ensuring that all entities operating these specific engine models within Australian airspace adhere to the prescribed safety standards. The regulation does not specify exclusions, exemptions, or thresholds, but its application may be extended or restricted through subordinate instruments issued by the Civil Aviation Safety Authority.

Key Provisions

The Civil Aviation Regulations 1998, particularly Part 39 - 106, impose specific requirements and obligations concerning the airworthiness of Rolls Royce Spey Series turbine engines. Specifically, Airworthiness Directive (AD/RRT-S/8) addresses the combustion section, more precisely the primary air scoops, of certain Rolls Royce Spey engines (section 12/85). This directive applies to a range of engine models, including the Spey 506-14, 506-14A, 506-14D, 511-5W, 511-8, 511-14, 511-14W, 512-14E, 512-14DW, 512-5, 512-5W, 555-15, 555-15H, 555-15N, and 555-15P. The directive mandates compliance with Rolls Royce Service Bulletin (S.B.) Sp 72-997, which outlines an improved standard for the overhaul of primary air scoops. This requirement must be met at the next engine overhaul or when the engine is disassembled sufficiently to allow access to the primary air scoops (section 12/85). The obligations imposed by this AD are quite clear. Operators and maintainers of the specified Rolls Royce engines must ensure that the overhaul or inspection of the primary air scoops adheres to the specifications and procedures outlined in Rolls Royce S.B. Sp 72-997. This includes performing the necessary work at the next engine overhaul or when the engine is sufficiently disassembled for access to the primary air scoops. The directive is grounded in a safety-critical incident where a primary air scoop failure led to severe consequences, including flame penetration of the engine major casings and the engine cowling. Thus, it is imperative that the specified maintenance actions are undertaken to prevent such incidents from recurring. Failure to comply with the requirements set forth in AD/RRT-S/8 could lead to significant legal and safety ramifications. The Civil Aviation Regulations 1998 do not explicitly state penalties for non-compliance in this specific context, but non-compliance with airworthiness directives can generally result in severe consequences. These may include the grounding of the aircraft until the non-compliant condition is rectified, fines, or other enforcement actions by the Civil Aviation Safety Authority (CASA). The safety implications of non-compliance could also result in criminal charges if an incident were to occur due to the failure to adhere to the directive. Given the potential severity of the consequences of primary air scoop failure, as evidenced by the incident that prompted the directive, strict adherence to the AD is essential.