{"id":"F2006B08566","name":"AD/CJ610/2 - Stage 1 Turbine Wheels","slug":"ad-cj610-2-stage-1-turbine-wheels","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51405,"registerId":"commonwealth-F2006B08566-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CJ610/2 - Stage 1 Turbine Wheels","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)  General Electric Turbine Engines - CJ610 Series\n\n \n\nAD/CJ610/2 Stage 1 Turbine Wheels 9/85\n\nApplicability: All CJ610-1, 04, -5 and -6 engine models fitted with P/N 634E583P4 and 634E583P4Y stage 1 turbine wheels.\n\n \n\nDocument: 1. General Electric Alert SB (CJ610) A72-70 Addendum 1; or\n\n \n\n2. FAA AD 73-23-5 Amdt. 39-1742 as amended by Amendment 39-1775; or AD/GE-T/27.\n\nCompliance: As detailed in the compliance 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":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD's scope is limited to specific CJ610 engine models fitted with two identified stage 1 turbine wheel part numbers, and it requires following specified technical documents. The instrument does not expand or narrow that scope within its text; it delegates the exact inspection/repair measures to the referenced documents. There is no indication in the AD text itself that the stated scope differs from its original intent as expressed in the applicability and document references (Applicability; Document; Compliance)."},"complexity_factors":["Narrow technical scope: applies only to CJ610-1, -4, -5 and -6 engines fitted with two specific stage 1 turbine wheel part numbers (634E583P4 and 634E583P4Y) (Applicability).","Delegation to external documents: the AD requires compliance with one of several referenced technical documents rather than specifying procedures itself (Document; Compliance).","Dependence on technical documents' clarity and availability: practical implementation and cost depend entirely on the referenced service bulletin or FAA AD content (Document; Compliance).","Identification and verification burden: compliance requires accurate parts identification and possibly records checks to determine which engines are affected (Applicability).","Regulatory binding effect with limited procedural text: AD is short and procedural but creates binding obligations, shifting technical complexity to the referenced materials (AD header; Document; Compliance)."],"plain_english_summary":"This AD (AD/CJ610/2) requires operators of certain General Electric CJ610-1/4/5/6 engines fitted with stage‑1 turbine wheels (P/N 634E583P4 or 634E583P4Y) to comply with prescribed inspection, repair and parts procedures by following one of the referenced technical documents. \n\nIt affects aircraft owners/operators, maintenance organisations and parts suppliers by imposing mandatory maintenance actions and associated costs to retain airworthiness and avoid enforcement."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive focused on a specific mechanical defect in specific engine models. It has not expanded beyond its original purpose of addressing the Stage 1 Turbine Wheel safety issue identified in the referenced manufacturer service bulletin and FAA AD."},"complexity_factors":["Very short document (approximately 200 words)","Only 2 defined/applicable part numbers","4 specific engine models listed","No nested conditional logic or exceptions","Simple structure: applicability → document reference → compliance requirement","Cross-references are external technical documents rather than legislative cross-references","No interpretation section or defined terms within the instrument itself"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires specific maintenance actions on certain jet engines to prevent dangerous failures.\n\n**What it does:**\n- Orders inspection or replacement of **Stage 1 Turbine Wheels** (critical rotating parts in jet engines that extract power from hot exhaust gases) on specific General Electric CJ610 engines\n- Applies to engines with specific part numbers: **P/N 634E583P4 and 634E583P4Y**\n\n**Who it affects:**\n- Owners and operators of aircraft using **CJ610-1, CJ610-4, CJ610-5, and CJ610-6** engine models\n- These are typically older business jets and military trainer aircraft (including some Learjet models)\n\n**Why it matters:**\n- Turbine wheels spin at extreme speeds and temperatures. If they crack or fail, they can destroy the engine and potentially damage the aircraft\n- This AD addresses a known safety defect identified by the manufacturer (General Electric) and the US Federal Aviation Administration (FAA)\n- Compliance is **legally mandatory** — operators must follow the referenced technical documents to inspect or replace these parts\n\n**How to comply:**\nOperators must follow the detailed instructions in one of these documents:\n- General Electric Alert Service Bulletin A72-70 Addendum 1, **or**\n- FAA Airworthiness Directive 73-23-5 (as amended), **or** \n- Australian AD/GE-T/27\n\nFailure to comply can result in the aircraft being grounded or operators facing enforcement action."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cj610-2-stage-1-turbine-wheels","history":"/api/acts/ad-cj610-2-stage-1-turbine-wheels/history","analysis":"/api/acts/ad-cj610-2-stage-1-turbine-wheels/analysis","conflicts":"/api/acts/ad-cj610-2-stage-1-turbine-wheels/conflicts","importantCases":"/api/acts/ad-cj610-2-stage-1-turbine-wheels/important-cases","documents":"/api/acts/ad-cj610-2-stage-1-turbine-wheels/documents"}}