{"id":"F2006B08701","name":"AD/DART/14 - Low Pressure Impeller - Inspection","slug":"ad-dart-14-low-pressure-impeller-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51881,"registerId":"commonwealth-F2006B08701-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DART/14 - Low Pressure Impeller - 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 - Dart Series\n\n \n\nAD/DART/14 Low Pressure Impeller - Inspection 11/87\n\nApplicability: All Dart RDa-6, RDa-7 series engines.\n\n \n\nRequirement: 1. Action in accordance with Rolls Royce SB Da 72-A445 Rev 5; or\n\n \n\n2. AD/RRT/27E.\n\n \n\nCompliance:  As detailed in Requirement Document. Background: Reissue of AD/RRT/27E.\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 straightforward reissue of an existing airworthiness directive (AD/RRT/27E) with updated reference to current manufacturer service bulletin. The scope remains limited to inspection of low pressure impellers on specific Dart engine models — exactly as originally intended. No expansion of coverage or purpose."},"complexity_factors":["Extremely short document (under 200 words)","Only 2 substantive requirements with an either/or choice","No defined terms section — relies entirely on external documents (Rolls-Royce Service Bulletin and previous AD)","No conditional logic or nested exceptions","Single applicability criterion (engine model series)","Compliance timing deferred entirely to external 'Requirement Document'"],"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) that requires specific maintenance actions on aircraft engines.\n\n**What it does:** It orders owners and operators of **Rolls-Royce Dart RDa-6 and RDa-7 series turbine engines** to inspect the **low pressure impeller** (a rotating component that compresses air in the engine). The inspection must follow either:\n- **Rolls-Royce Service Bulletin Da 72-A445 Revision 5** (the manufacturer's official maintenance instruction), OR\n- **AD/RRT/27E** (an earlier version of this same safety order)\n\n**Who it affects:** Anyone operating or maintaining aircraft powered by these specific Rolls-Royce Dart engines — typically older regional turboprop aircraft.\n\n**Why it matters:** Impeller failures can cause catastrophic engine damage or in-flight emergencies. This directive ensures potential cracks or defects are found before they cause accidents. The \"reissue\" note indicates CASA updated the requirements to align with newer manufacturer guidance.\n\n**When to comply:** Operators must follow the timelines specified in whichever document they choose (the Rolls-Royce bulletin or the previous AD)."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The text states it is a reissue of AD/RRT/27E (Background). The instrument keeps the same applicability (Dart RDa-6 and RDa-7 engines) and delegates technical requirements to the same referenced documents (Requirement). On the face of the supplied text, the scope remains the same as the prior AD rather than expanding to new types or imposing additional categories of obligation."},"complexity_factors":["Short, focused instrument with narrow applicability to specific engine series (reduces complexity). (Applicability)","Dependence on external documents (Rolls Royce SB Da 72-A445 Rev 5 and AD/RRT/27E) for technical detail (adds complexity through cross-reference). (Requirement)","Two alternative compliance routes are offered, requiring operators to choose between them (moderate added complexity). (Requirement)","Lack of procedural detail in the text itself—compliance, timing and steps are delegated to referenced documents (operational complexity rests in external sources). (Compliance)","Administrative note that this is a reissue rather than a substantively new regime (reduces scope complexity). (Background)"],"plain_english_summary":"This instrument reissues an airworthiness directive requiring inspections or other actions on all Rolls‑Royce Dart RDa‑6 and RDa‑7 engines, with compliance achieved by following Rolls‑Royce Service Bulletin Da 72‑A445 Rev 5 or AD/RRT/27E.  \n\nOwners and operators must bear inspection, repair and downtime costs; the AD delegates the technical steps, timing and criteria to the referenced documents, concentrating compliance burden on operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dart-14-low-pressure-impeller-inspection","history":"/api/acts/ad-dart-14-low-pressure-impeller-inspection/history","analysis":"/api/acts/ad-dart-14-low-pressure-impeller-inspection/analysis","conflicts":"/api/acts/ad-dart-14-low-pressure-impeller-inspection/conflicts","importantCases":"/api/acts/ad-dart-14-low-pressure-impeller-inspection/important-cases","documents":"/api/acts/ad-dart-14-low-pressure-impeller-inspection/documents"}}