{"id":"F2006B08697","name":"AD/DART/10 - Low Torque Switch","slug":"ad-dart-10-low-torque-switch","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51871,"registerId":"commonwealth-F2006B08697-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DART/10 - Low Torque Switch","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/10 Low Torque Switch 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 61-12 Rev 2; or\n\n \n\n2. AD/RRT/22B.\n\n \n\nEffectivity: Forthwith.\n\n \n\nBackground: Reissue of AD/RRT/22B.\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":3,"scope_assessment":{"changed":false,"description":"The AD is described in the text as a reissue of AD/RRT/22B (Background). The Applicability remains limited to Dart RDa-6 and RDa-7 series engines and the Requirement continues to refer to the same Rolls Royce service bulletin or the prior AD. On that basis, the scope as stated here does not appear to change from the previously issued AD (Background; Applicability; Requirement)."},"complexity_factors":["Short, narrowly targeted directive with limited text","Relies on external technical documents (Rolls Royce SB Da 61-12 Rev 2 or AD/RRT/22B) for operative detail","Immediate effectivity (Forthwith) requiring prompt action","Binary compliance options (two named documents) rather than procedural detail in the AD","Technical work likely requires specialist maintenance skills and parts (implied by reference to manufacturer SB)","Small affected population (specific engine series) simplifies scope but concentrates obligations"],"plain_english_summary":"This directive requires owners/operators of aircraft with Rolls‑Royce Dart RDa‑6 and RDa‑7 engines to carry out specified inspections/repairs immediately, by either following Rolls‑Royce SB Da 61‑12 Rev 2 or the earlier AD/RRT/22B. Compliance and costs (parts, labour, downtime) fall to owners/operators and their maintenance providers; the AD reissues a prior requirement and points to those external documents for the technical steps, creating an immediate obligation to obtain and apply them."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue safety directive focused specifically on the Low Torque Switch in Dart RDa-6 and RDa-7 engines. It references its own predecessor (AD/RRT/22B) but does not indicate any expansion beyond the original safety purpose. The scope remains tightly constrained to the specific technical issue identified."},"complexity_factors":["Extremely short document — only 8 substantive lines","No defined terms section — all terms are industry standard or reference external documents","Simple binary compliance path (Option 1 OR Option 2)","No nested conditions, exceptions, or cross-references to other legislation beyond two specific technical documents","Single applicability criterion (engine model series)","Immediate effectivity with no phased implementation or conditional timelines"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft engines.\n\n**What it does:**\nIt requires owners and operators of certain Rolls Royce Dart engines (specifically the RDa-6 and RDa-7 series) to take specific safety actions to address a problem with the \"Low Torque Switch.\" A low torque switch is a component that monitors engine power output — if torque drops too low, it can indicate engine trouble or failure.\n\n**Who must act:**\nAnyone operating aircraft with these specific Rolls Royce Dart turbine engines.\n\n**What action is required:**\nOperators must either:\n- Follow Rolls Royce Service Bulletin Da 61-12 (Revision 2) — this is the manufacturer's official repair/inspection instructions; **OR**\n- Comply with a different Airworthiness Directive called AD/RRT/22B\n\n**When:**\n\"Forthwith\" — meaning immediately, without delay.\n\n**Why it matters:**\nThis directive was reissued to ensure engine safety. The low torque switch is critical for detecting engine performance problems. If it fails or malfunctions, pilots might not receive proper warnings about engine issues, potentially leading to dangerous situations in flight. This AD ensures all affected engines get the necessary fix."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dart-10-low-torque-switch","history":"/api/acts/ad-dart-10-low-torque-switch/history","analysis":"/api/acts/ad-dart-10-low-torque-switch/analysis","conflicts":"/api/acts/ad-dart-10-low-torque-switch/conflicts","importantCases":"/api/acts/ad-dart-10-low-torque-switch/important-cases","documents":"/api/acts/ad-dart-10-low-torque-switch/documents"}}