{"id":"F2006B06689","name":"AD/RRT-S/8 - Combustion Section - Primary Airscoop","slug":"ad-rrt-s-8-combustion-section-primary-airscoop","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48735,"registerId":"commonwealth-F2006B06689-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/RRT-S/8 - Combustion Section - Primary Airscoop","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/8 Combustion Section - Primary Airscoop 12/85\n\nApplicability: 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, 555-15P.\n\n \n\nRequirement: ROLLS ROYCE S.B. Sp 72-997.\n\n \n\nCompliance: At next engine overhaul or when the engine is disassembled sufficiently to allow access to the primary air scoops.\n\n \n\nBackground: Rolls Royce advise there has been as incident where a primary air scoop failure resulted in flame penetration of the engine major casings and the engine cowling. This Directive requires compliance with Rolls Royce S.B. Sp 72-997 which details an improved standard of primary air scoop overhaul.\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","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"Scope is confined to the listed Spey engine models and to the primary air scoop overhaul standard set out in Rolls Royce S.B. Sp 72‑997 (Applicability and Requirement clauses). The instrument does not broaden applicability beyond those engines nor change the timing beyond the specified compliance trigger (Compliance clause)."},"complexity_factors":["Narrow technical scope limited to primary air scoop overhaul on specific Rolls‑Royce Spey engine variants (Applicability clause).","Dependence on an external document for the substantive work: Rolls Royce S.B. Sp 72‑997 (Requirement clause).","Simple compliance timing: ‘at next engine overhaul’ or when access is available (Compliance clause), creating a clear but conditional deadline.","Safety‑critical nature of the task requires certified maintenance competence and record keeping, increasing operational burden despite regulatory simplicity (Background/Requirement).","Low regulatory discretion in the directive itself — it mandates compliance with a named service bulletin rather than leaving standards to operator judgement."],"plain_english_summary":"This airworthiness directive requires operators of specified Rolls‑Royce Spey engines to follow Rolls Royce Service Bulletin Sp 72‑997 to upgrade the primary air scoop overhaul standard (Requirement: Rolls Royce S.B. Sp 72‑997). It applies to the listed Spey variants and must be done at the next engine overhaul or whenever the engine is opened enough to access the scoops (Compliance clause). Engine owners/operators pay for and arrange the overhaul work; maintainers carry out the specified overhaul standard."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive focused specifically on primary airscoop overhauls for a defined set of engine models. It has not expanded beyond its original purpose of addressing the specific flame penetration risk identified by Rolls-Royce."},"complexity_factors":["Very short document (under 200 words)","Only 4 defined elements: applicability list, requirement reference, compliance timing, and background explanation","No cross-references to other legislation or regulations beyond the single Rolls-Royce service bulletin","No conditional logic or nested exceptions — compliance is straightforward and mandatory","Single operational requirement with clear trigger events for compliance"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). Think of it like a compulsory recall notice, but for aircraft engines rather than cars.\n\n**What it does:** It requires owners and operators of specific Rolls-Royce Spey jet engines to inspect and overhaul the \"primary airscoop\" — a component that channels air into the engine's combustion section. The work must follow Rolls-Royce Service Bulletin Sp 72-997, which specifies an improved overhaul standard.\n\n**Who it affects:** Anyone operating aircraft with these specific Rolls-Royce Spey engine 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. These are typically older jet engines used in some business jets and military aircraft conversions.\n\n**Why it matters:** A primary airscoop failure can allow flames to escape the engine and burn through the engine casing and outer cowling — a serious fire hazard. This directive prevents that by ensuring the airscoops are overhauled to a tougher standard.\n\n**When to comply:** At the next scheduled engine overhaul, or whenever the engine is already pulled apart far enough to reach the airscoops — whichever comes first. This avoids forcing operators to tear down engines early just for this inspection."}},"importantCases":[],"_links":{"self":"/api/acts/ad-rrt-s-8-combustion-section-primary-airscoop","history":"/api/acts/ad-rrt-s-8-combustion-section-primary-airscoop/history","analysis":"/api/acts/ad-rrt-s-8-combustion-section-primary-airscoop/analysis","conflicts":"/api/acts/ad-rrt-s-8-combustion-section-primary-airscoop/conflicts","importantCases":"/api/acts/ad-rrt-s-8-combustion-section-primary-airscoop/important-cases","documents":"/api/acts/ad-rrt-s-8-combustion-section-primary-airscoop/documents"}}