{"id":"F2006B08708","name":"AD/DART/22 - High Pressure Impeller","slug":"ad-dart-22-high-pressure-impeller","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51898,"registerId":"commonwealth-F2006B08708-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DART/22 - High Pressure Impeller","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 - Dart Series\n\n \n\nAD/DART/22 High Pressure Impeller 11/87\n\nApplicability: All Dart RDa-6 series engines.\n\n \n\nRequirement: 1. Action in accordance with Rolls Royce SB Da 72-496; or\n\n \n\n2. AD/RRT/38. Compliance: Forthwith.\n\nBackground: Reissue of AD/RRT/38.\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","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument states it is a reissue of AD/RRT/38 (Background). The stated applicability remains \"All Dart RDa-6 series engines\" and the Requirement is to act in accordance with Rolls Royce SB Da 72-496 or AD/RRT/38 (Applicability; Requirement). On the face of the text provided, the scope (who is covered and the required actions) is consistent with the original AD/RRT/38 and has not been expanded or narrowed in this reissue."},"complexity_factors":["Short, single-topic directive with limited text and clear applicability","Immediate compliance requirement (\"Forthwith\") increases operational urgency","Cross-reference to an external manufacturer service bulletin (Rolls Royce SB Da 72-496) and another AD (AD/RRT/38) creates dependency on external documents","No procedural detail, enforcement mechanism, or timeline beyond 'forthwith' in the text (requires consultation of referenced documents and regulatory framework)","Technical content and exact remedial steps are contained in the referenced service bulletin or AD rather than in this instrument"],"plain_english_summary":"This instrument is an airworthiness directive under the Civil Aviation Safety Authority that applies to all Rolls‑Royce Dart RDa‑6 series engines. Owners/operators must, forthwith, either carry out the work in Rolls‑Royce Service Bulletin Da 72‑496 or comply with AD/RRT/38. It reissues AD/RRT/38, imposes immediate operational and cost obligations on affected operators, and delegates technical detail to the referenced documents."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive targeting a specific mechanical component in a specific engine series. It has not expanded beyond its original safety purpose."},"complexity_factors":["Extremely short document (under 200 words)","Only 1 defined applicability criterion (engine series)","Simple binary compliance path (follow SB or previous AD)","No nested exceptions or conditional logic","No cross-references to other legislation beyond a single service bulletin and superseded AD","Single immediate compliance deadline ('forthwith') with no phased implementation"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft engines.\n\n**What it does:** It requires owners or operators of certain Rolls Royce Dart engines (specifically the RDa-6 series) to take immediate action to inspect or fix a problem with the **high pressure impeller** — a critical rotating component that compresses air in the engine. If this part fails, it can cause catastrophic engine damage or failure.\n\n**Who must comply:** Anyone operating aircraft with Dart RDa-6 series engines.\n\n**What action is required:** Operators must follow the instructions in Rolls Royce Service Bulletin Da 72-496, which details the specific inspection or replacement procedures. Alternatively, they can comply with a related directive (AD/RRT/38), which this document replaces.\n\n**When:** **Forthwith** — meaning immediately, without delay. This indicates an urgent safety issue.\n\n**Why it matters:** This directive prevents potential engine failures that could lead to accidents. Compliance is legally mandatory — flying without addressing this issue would violate civil aviation safety regulations."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dart-22-high-pressure-impeller","history":"/api/acts/ad-dart-22-high-pressure-impeller/history","analysis":"/api/acts/ad-dart-22-high-pressure-impeller/analysis","conflicts":"/api/acts/ad-dart-22-high-pressure-impeller/conflicts","importantCases":"/api/acts/ad-dart-22-high-pressure-impeller/important-cases","documents":"/api/acts/ad-dart-22-high-pressure-impeller/documents"}}