{"id":"F2006B08532","name":"AD/CH-3/1 Amdt 1 - Engine Mount - Inspection","slug":"ad-ch-3-1-amdt-1-engine-mount-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51295,"registerId":"commonwealth-F2006B08532-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CH-3/1 Amdt 1 - Engine Mount - 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 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Chrislea CH-3 Series Aeroplanes\n\n \n\n# AD/CH-3/1\n\nAmdt 1\n\nApplicability: All series 2.\n\n# Engine Mount - Inspection NK\n\n \n\nDocument: 1. Chrislea SB No. 3 dated 24 dated 24 May, 1950; or\n\n \n\n2. ANO 105.1.13.1.6.1\n\n \n\nCompliance: At intervals not exceeding 50 hours time in service.\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":true,"description":"This entry is labelled \"Amdt 1,\" indicating it is an amendment to the original AD/CH-3/1. The supplied text specifies applicability (All series 2), acceptable inspection procedures (Chrislea SB No. 3 dated 24 May 1950 or ANO 105.1.13.1.6.1), and a recurring inspection interval (not exceeding 50 hours time in service). The supplied document does not include the original AD text or show what language the amendment changed, so the exact nature of the scope change relative to the original is not determinable from the material provided."},"complexity_factors":["Narrow applicability: applies only to Chrislea CH-3, \"All series 2\" (Applicability).","Single, clear operational requirement: periodic inspection of engine mount (Compliance).","Two alternative reference documents must be obtained and followed—accessing and reconciling them adds minor complexity (Document: Chrislea SB No. 3; ANO 105.1.13.1.6.1).","No technical inspection steps are reproduced in the AD text; implementers must consult the referenced documents for procedure details (Document).","No enforcement, recordkeeping or remedial-action detail in the supplied text—those aspects may require cross-reference to broader regulatory material (header references Civil Aviation Regulations Part 39)."],"plain_english_summary":"Owners and operators of Chrislea CH‑3 Series 2 aircraft must carry out recurring engine‑mount inspections using either Chrislea Service Bulletin No. 3 (24 May 1950) or ANO 105.1.13.1.6.1. Inspections are mandatory at intervals not exceeding 50 hours time in service, creating a recurring maintenance obligation and associated labor/repair costs for operators and maintenance organisations."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a narrow, technical maintenance directive for a specific vintage aircraft type. It has not expanded beyond its original purpose of ensuring engine mount integrity through periodic inspection."},"complexity_factors":["Extremely short document — only 8 substantive lines of regulatory text","No defined terms section — relies on external references only","Simple binary compliance path (two acceptable source documents)","Single, unambiguous compliance interval (50 hours time in service)","No conditional logic, exceptions, or nested requirements","Limited applicability (single aircraft series, single variant)","No cross-references to other legislation beyond the two source documents"],"plain_english_summary":"This is an **Airworthiness Directive** (AD) — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to all **Chrislea CH-3 Series 2 aeroplanes** (a type of light aircraft).\n\n**What it requires:**\n- **Inspection of the engine mount** — the structural frame that holds the aircraft's engine in place\n- **How often:** Every 50 hours of \"time in service\" (actual flying hours, not just calendar time)\n\n**Why it matters:**\nEngine mounts are critical safety components. If they crack or fail, the engine could detach from the aircraft in flight. This directive ensures regular checks to catch problems before they become catastrophic.\n\n**What to follow:**\nOperators must use one of two documents as their inspection guide:\n- Chrislea Service Bulletin No. 3 (dated 24 May 1950), **or**\n- ANO 105.1.13.1.6.1 (an older Air Navigation Order)\n\nThis is **Amendment 1** (Amdt 1), meaning it's an updated version of an earlier directive."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ch-3-1-amdt-1-engine-mount-inspection","history":"/api/acts/ad-ch-3-1-amdt-1-engine-mount-inspection/history","analysis":"/api/acts/ad-ch-3-1-amdt-1-engine-mount-inspection/analysis","conflicts":"/api/acts/ad-ch-3-1-amdt-1-engine-mount-inspection/conflicts","importantCases":"/api/acts/ad-ch-3-1-amdt-1-engine-mount-inspection/important-cases","documents":"/api/acts/ad-ch-3-1-amdt-1-engine-mount-inspection/documents"}}