{"id":"F2006B09001","name":"AD/DHC-1/18 - Fuselage Centre Top Structure - Inspection and Modification","slug":"ad-dhc-1-18-fuselage-centre-top-structure-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52648,"registerId":"commonwealth-F2006B09001-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-1/18 - Fuselage Centre Top Structure - Inspection and Modification","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)  De Havilland DHC-1 (Chipmunk) Series Aeroplanes\n\n \n\nAD/DHC-1/18 Fuselage Centre Top Structure - Inspection\n\nand Modification\n\n\n8/67\n\n \n\nApplicability: All models.\n\n \n\nDocument: Hawker Siddeley TNS CT(C1) No. 154. Compliance: Before 1 January, 1968.\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\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":3103},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains a narrow, targeted scope focused solely on mandatory safety inspection and modification of the fuselage centre top structure for De Havilland DHC-1 aircraft. There is no indication of expansion beyond the original airworthiness safety intent."},"complexity_factors":["Incorporation by reference of external technical standard (Hawker Siddeley TNS CT(C1) No. 154)","Minimal legislative text (under 100 words) with substantive requirements contained entirely in referenced external document","Single unconditional applicability clause covering all models of the aircraft type"],"plain_english_summary":"This Airworthiness Directive legally requires owners/operators of all De Havilland DHC‑1 Chipmunk aircraft to inspect and modify the fuselage centre top structure per Hawker Siddeley TNS CT(C1) No. 154.  \n\nCompliance is mandatory and must be completed by 1 January 1968 to address a safety issue affecting structural integrity and continued airworthiness."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-1-18-fuselage-centre-top-structure-inspection-and-modification","history":"/api/acts/ad-dhc-1-18-fuselage-centre-top-structure-inspection-and-modification/history","analysis":"/api/acts/ad-dhc-1-18-fuselage-centre-top-structure-inspection-and-modification/analysis","conflicts":"/api/acts/ad-dhc-1-18-fuselage-centre-top-structure-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-dhc-1-18-fuselage-centre-top-structure-inspection-and-modification/important-cases","documents":"/api/acts/ad-dhc-1-18-fuselage-centre-top-structure-inspection-and-modification/documents"}}