{"id":"F2006B08568","name":"AD/CJ610/4 - Outer Combustion Casing","slug":"ad-cj610-4-outer-combustion-casing","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51407,"registerId":"commonwealth-F2006B08568-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CJ610/4 - Outer Combustion Casing","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/CJ610/4 Outer Combustion Casing 9/85\n\nApplicability: All CJ610 series engines fitted with outer combustion casings P/No. 37R601112P115, 37R601112P119, 6006T64G01, 2920T29P01, 2920T29P02, 2920T29P03.\n\n \n\nDocument: General Electric Alert Service Bulletin (CJ610) A72-116 and Addendum 1; or AD/GE-T/29A.\n\nCompliance: As detailed in the Requirement Document.\n\n \n\nBackground: This Directive is raised in issue in order to add Addendum 1 to the manufacturer's reference document. This addendum adds further affected outer combustion casing part numbers.\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":4,"scope_assessment":{"changed":true,"description":"Yes. The Background states the Directive was raised to add Addendum 1 to the manufacturer's reference document and that this addendum \"adds further affected outer combustion casing part numbers.\" That means the AD's scope was broadened to include additional outer combustion casing part numbers beyond those previously covered. (See: \"Background\", \"Applicability\")."},"complexity_factors":["References an external manufacturer's Alert Service Bulletin and Addendum for the substantive technical requirements rather than stating them in the AD (\"Document\", \"Compliance\").","Requires identification of engines by specific part numbers (technical specificity in \"Applicability\").","Scope expanded by manufacturer addendum, increasing number of affected units (\"Background\").","Compliance actions are delegated to a separate Requirement Document, creating an implementation dependency and potential document-access burden (\"Compliance\").","Regulatory enforcement rests on the Part 39 airworthiness directive mechanism, which is a standard but technical regulatory process (header)."],"plain_english_summary":"# What this directive does\n\n- Mechanically, the document AD/CJ610/4 updates which specific outer combustion casing part numbers for General Electric CJ610 series engines are covered by an airworthiness directive. It does this by referencing the manufacturer's Alert Service Bulletin A72-116 together with Addendum 1 (or AD/GE-T/29A) and requiring compliance \"as detailed in the Requirement Document.\" (See: \"Document\", \"Compliance\", \"Applicability\").\n\n# Who is affected\n\n- Owners, operators and maintenance organisations responsible for CJ610 series engines that are fitted with any of the listed outer combustion casing part numbers: P/No. 37R601112P115, 37R601112P119, 6006T64G01, 2920T29P01, 2920T29P02, 2920T29P03. (See: \"Applicability\").\n\n# Why it matters (mechanical consequences, not intent)\n\n- The directive makes those specific engines subject to the inspection/repair/other actions set out in the referenced manufacturer document. The required actions themselves are not detailed in this text; this document delegates the technical requirements to the manufacturer's Alert Service Bulletin and its addendum. (See: \"Document\", \"Compliance\").\n\n# Who pays and who decides\n\n- Financial and operational consequences fall on the holders of the affected engines (owners/operators/maintenance providers), because they are the parties required to carry out whatever actions the Requirement Document prescribes. (See: \"Applicability\", \"Compliance\").\n- The Civil Aviation Safety Authority issues and records the directive under the Civil Aviation Regulations (Part 39) framework. The AD references the manufacturer's service bulletin as the technical source. (See header and \"Document\").\n\n# Practical trade-offs, compliance burden and implementation risks\n\n- Delegation to an external technical document: The AD points to a manufacturer's alert service bulletin and its addendum for the substantive requirements rather than reproducing those requirements. This reduces length of the AD but requires operators to obtain and follow the external document to know what to do. (See: \"Document\", \"Compliance\").\n- Scope expansion: The Background states the AD was issued to add Addendum 1, which in turn \"adds further affected outer combustion casing part numbers.\" That increases the number of engines/parts subject to the requirement and therefore increases the pool of operators who will face compliance costs. (See: \"Background\", \"Applicability\").\n- Identification and logistics: Operators must identify whether their engines use any of the listed part numbers and then schedule the required actions. That creates administrative and maintenance-scheduling costs for affected operators. (See: \"Applicability\", \"Compliance\").\n- Enforcement and discretion: This AD invokes the standard regulatory mechanism (Part 39 Schedule of Airworthiness Directives) to make the manufacturer's addendum mandatory; the AD itself does not specify discretionary exemptions or alternative means of compliance in this text. Compliance details are those set out in the Requirement Document referenced. (See: header, \"Compliance\").\n\n# Concentration of costs and benefits\n\n- The change concentrates immediate compliance obligations on the subset of CJ610 engine holders whose engines carry the listed part numbers. The technical benefits (as claimed by the manufacturer when issuing service bulletins) and any safety or economic effects are realised by the system at large only to the extent the Requirement Document prescribes actions and operators implement them. The AD text itself only states that Addendum 1 expands the list of affected part numbers; it does not quantify costs or operational impacts. (See: \"Background\", \"Applicability\")."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a minor amendment to an existing Airworthiness Directive, expanding the list of affected part numbers. It remains tightly scoped to its original purpose of addressing safety issues with specific outer combustion casings in CJ610 engines."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","No defined terms section — relies entirely on external manufacturer documents for technical specifications","Simple structure: applicability, document reference, compliance, background","No conditional logic or nested exceptions — straightforward mandate to follow external bulletin","Single amendment purpose (adding part numbers via addendum)"],"plain_english_summary":"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:**\nThis directive requires owners and operators of **General Electric CJ610 series turbine engines** to take specific safety actions regarding certain **outer combustion casings** (the metal housing around the engine's combustion chamber).\n\n**Who it affects:**\n- Anyone operating aircraft with CJ610 engines that have specific part numbers: 37R601112P115, 37R601112P119, 6006T64G01, 2920T29P01, 2920T29P02, or 2920T29P03\n- Maintenance organisations servicing these engines\n\n**What must be done:**\nOperators must follow the instructions in **General Electric Alert Service Bulletin A72-116 (including Addendum 1)** or an equivalent directive (AD/GE-T/29A). The exact compliance steps — which typically involve inspection, repair, or replacement — are contained in those manufacturer documents rather than spelled out here.\n\n**Why it matters:**\nThis directive was **updated** to add more part numbers to the safety notice (via Addendum 1). This suggests the manufacturer discovered additional components may have the same safety defect originally identified. Airworthiness Directives are legally binding — failure to comply can ground an aircraft and expose operators to penalties.\n\n**Key point:** This is a **reference directive** — it doesn't detail the actual technical work required, but legally mandates that operators must follow the manufacturer's service bulletin."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cj610-4-outer-combustion-casing","history":"/api/acts/ad-cj610-4-outer-combustion-casing/history","analysis":"/api/acts/ad-cj610-4-outer-combustion-casing/analysis","conflicts":"/api/acts/ad-cj610-4-outer-combustion-casing/conflicts","importantCases":"/api/acts/ad-cj610-4-outer-combustion-casing/important-cases","documents":"/api/acts/ad-cj610-4-outer-combustion-casing/documents"}}