{"id":"F2006B06685","name":"AD/RRT-S/4 Amdt 1 - H.P. Fuel Shut Off Valve Primary Strainer - Inspection","slug":"ad-rrt-s-4-amdt-1-h-p-fuel-shut-off-valve-primary-strainer-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48718,"registerId":"commonwealth-F2006B06685-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/RRT-S/4 Amdt 1 - H.P. Fuel Shut Off Valve Primary Strainer - Inspection","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/4\n\nAmdt 1\n\n\nH.P. Fuel Shut Off Valve Primary Strainer - Inspection\n\n\n5/78\n\n \n\nApplicability:  Spey 511-8 engines fitted with HP shut-off valves featuring Lucas SB LSB Sp 73- 158 but not fitted with H.P. fuel pumps featuring either LSB Sp 73-127 or LSB Sp 73-212.\n\n \n\nRequirement:  Rolls Royce Spey SB No. Sp 73-182. 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","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive focused on a specific technical inspection. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (under 200 words)","Only 3 defined applicability criteria (engine model, valve specification, pump exclusion)","Single requirement referencing external technical document","No nested conditions or cross-references to other legislation","Straightforward binary applicability test (fitted with X but not fitted with Y)"],"plain_english_summary":"This is a **safety directive for aircraft engines**. It requires owners and operators of specific Rolls-Royce Spey 511-8 jet engines to inspect a particular fuel filter component.\n\n**What it does:**\n- Mandates an inspection of the **High Pressure (H.P.) Fuel Shut Off Valve Primary Strainer** — a filter that stops debris from entering the fuel system\n- Requires compliance with Rolls-Royce Service Bulletin Sp 73-182 (a manufacturer's technical instruction)\n\n**Who it affects:**\n- Operators of aircraft using **Spey 511-8 engines** that have:\n  - HP shut-off valves with **Lucas Service Bulletin LSB Sp 73-158**\n  - **But NOT** HP fuel pumps with LSB Sp 73-127 or LSB Sp 73-212\n\n**Why it matters:**\nFuel system contamination can cause engine failure. This directive prevents that by ensuring a specific strainer is checked according to manufacturer guidelines. Non-compliance could ground aircraft or create safety risks.\n\n**Key terms explained:**\n- **Airworthiness Directive (AD):** A mandatory safety order issued by aviation regulators\n- **Service Bulletin (SB):** Manufacturer's official technical instruction for maintenance or modification\n- **Compliance:** The deadline or schedule for completing the required action"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"The instrument is labelled as an amendment (\"Amdt 1\"), which indicates a change from a prior version of AD/RRT-S/4. The AD text provided does not specify what was altered by the amendment, only that the current requirement is to follow Rolls Royce Spey SB No. Sp 73-182 for inspection and that it applies to the engines specified under the Applicability clause."},"complexity_factors":["Technical specificity of applicability (engine model and multiple part/service bulletin numbers).","Conditional applicability (applies only where certain pumps are not fitted).","Reference to an external service bulletin (Rolls Royce Spey SB No. Sp 73-182) for procedural detail rather than containing steps in the AD itself.","Need to verify historical maintenance/fitment records to determine whether an engine falls within the AD's scope.","Limited information in the AD text about inspection intervals, corrective actions or enforcement mechanisms — these are delegated to the referenced document."],"plain_english_summary":"This AD mandates inspection of the H.P. fuel shut‑off valve primary strainer on certain Rolls‑Royce Spey 511‑8 engines — specifically those fitted per Lucas SB LSB Sp 73‑158 and not fitted with H.P. pumps under LSB Sp 73‑127 or Sp 73‑212.  \n\nThe directive delegates the detailed inspection and any corrective action to Rolls‑Royce Spey SB No. Sp 73‑182; affected operators must obtain the bulletin and fund and carry out the required work."}},"importantCases":[],"_links":{"self":"/api/acts/ad-rrt-s-4-amdt-1-h-p-fuel-shut-off-valve-primary-strainer-inspection","history":"/api/acts/ad-rrt-s-4-amdt-1-h-p-fuel-shut-off-valve-primary-strainer-inspection/history","analysis":"/api/acts/ad-rrt-s-4-amdt-1-h-p-fuel-shut-off-valve-primary-strainer-inspection/analysis","conflicts":"/api/acts/ad-rrt-s-4-amdt-1-h-p-fuel-shut-off-valve-primary-strainer-inspection/conflicts","importantCases":"/api/acts/ad-rrt-s-4-amdt-1-h-p-fuel-shut-off-valve-primary-strainer-inspection/important-cases","documents":"/api/acts/ad-rrt-s-4-amdt-1-h-p-fuel-shut-off-valve-primary-strainer-inspection/documents"}}