{"id":"F2006B06686","name":"AD/RRT-S/5 - In-Field Rectification of Low Power Indication - Performance Monitoring","slug":"ad-rrt-s-5-in-field-rectification-of-low-power-indication-performance-monitoring","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48723,"registerId":"commonwealth-F2006B06686-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/RRT-S/5 - In-Field Rectification of Low Power Indication - Performance Monitoring","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Rolls Royce Turbine Engines - Spey Series\n\n \n\nAD/RRT-S/5 In-Field Rectification of Low Power\n\nIndication - Performance Monitoring\n\nApplicability: Spey 555-15.\n\n \n\nRequirement: Rolls Royce SB No. Sp 71-242. Compliance:  As detailed in the requirement document.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n\n6/78\n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The document applies specifically to Rolls-Royce Spey 555-15 engines and requires compliance with the identified Rolls-Royce service bulletin. There is no indication within this AD text that the applicability or substantive scope has been expanded or narrowed from an earlier intent; the AD’s scope is limited and is defined by the 'Applicability' and the referenced service bulletin. (Applicability: Spey 555-15; Requirement: Rolls Royce SB No. Sp 71-242; Compliance: As detailed in the requirement document.)"},"complexity_factors":["The AD text is short and delegates technical detail to an external document (Rolls Royce SB No. Sp 71-242), reducing complexity in the AD itself but shifting complexity to the service bulletin.","Applicability is narrowly defined (Spey 555-15), which limits scope and stakeholders.","The AD does not specify procedures, timing, or compliance deadlines within the text (says only 'As detailed in the requirement document'), creating dependence on the external SB for operational detail.","Technical work (engine rectification and monitoring) is intrinsically specialised and requires qualified maintenance resources; that technical complexity is not described in the AD.","Enforcement and compliance rely on coordination between regulator, operator, and manufacturer documentation, introducing procedural complexity despite the AD’s brevity."],"plain_english_summary":"This AD mandates that operators of aircraft powered by Rolls‑Royce Spey 555‑15 engines rectify a “low power” indication and carry out associated performance monitoring by following Rolls‑Royce Service Bulletin No. Sp 71‑242. The regulator enforces the directive while the SB supplies the technical procedures, timing and inspections. Operators bear the costs (parts, labour, downtime); compliance burden and effectiveness therefore depend on the availability and clarity of the manufacturer’s service bulletin."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a narrow, technical maintenance directive focused on a specific engine model and a specific fault condition. It has not expanded beyond its original purpose of addressing the low power indication issue in Spey 555-15 engines."},"complexity_factors":["Extremely short document — only 2 substantive paragraphs","No defined terms section; relies entirely on external reference (Rolls-Royce Service Bulletin)","Single applicability criterion (Spey 555-15 engine model)","No conditional logic, exceptions, or nested provisions","Compliance requirement is a simple pointer to external document ('As detailed in the requirement document')","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998"],"plain_english_summary":"This is an **Airworthiness Directive** (AD) — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA). It applies specifically to **Rolls-Royce Spey 555-15 turbine engines** (used in aircraft like the BAC 1-11).\n\n**What it does:**\nThe directive requires aircraft operators to follow a specific Rolls-Royce Service Bulletin (SB No. Sp 71-242) to fix a problem where the engine shows **\"low power indication\"** — meaning the instruments suggest the engine isn't producing as much thrust as it should. The bulletin provides instructions for **in-field rectification** (fixing the problem without removing the engine from the aircraft) and **performance monitoring** (keeping track of how the engine performs after the fix).\n\n**Who it affects:**\n- Airlines or operators flying aircraft with Spey 555-15 engines\n- Maintenance engineers working on these engines\n\n**Why it matters:**\nLow power indication can mask real engine problems or cause pilots to misjudge available thrust — a serious safety risk during takeoff or emergency situations. This directive ensures all affected engines get inspected and fixed according to the manufacturer's latest safety instructions."}},"importantCases":[],"_links":{"self":"/api/acts/ad-rrt-s-5-in-field-rectification-of-low-power-indication-performance-monitoring","history":"/api/acts/ad-rrt-s-5-in-field-rectification-of-low-power-indication-performance-monitoring/history","analysis":"/api/acts/ad-rrt-s-5-in-field-rectification-of-low-power-indication-performance-monitoring/analysis","conflicts":"/api/acts/ad-rrt-s-5-in-field-rectification-of-low-power-indication-performance-monitoring/conflicts","importantCases":"/api/acts/ad-rrt-s-5-in-field-rectification-of-low-power-indication-performance-monitoring/important-cases","documents":"/api/acts/ad-rrt-s-5-in-field-rectification-of-low-power-indication-performance-monitoring/documents"}}