{"id":"F2006B09023","name":"AD/DHC-1/7 - Tailplane Attachment Lugs and Bulkhead - Inspection","slug":"ad-dhc-1-7-tailplane-attachment-lugs-and-bulkhead-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52702,"registerId":"commonwealth-F2006B09023-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-1/7 - Tailplane Attachment Lugs and Bulkhead - 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)  De Havilland DHC-1 (Chipmunk) Series Aeroplanes\n\n \n\nAD/DHC-1/7 Tailplane Attachment Lugs and Bulkhead - Inspection\n\n\n3/53\n\n \n\nApplicability: All models not modified in accordance with Chipmunk Mods. H66 and H70 or equivalent.\n\n \n\nDocument: 1. DH TNS CT(C1) Nos. 38 and 71; or\n\n \n\n2. DH (Canada) TNS, Series “C”, No. 33; or 3. ANO 105.1.14.15.6.2\n\nCompliance: At each daily inspection.\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":977},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted, single-issue airworthiness directive addressing a specific structural inspection requirement for one aircraft type. It maintains its original narrow scope of ensuring tailplane structural integrity through mandated inspections."},"complexity_factors":["Single, unambiguous compliance requirement (inspect at daily inspection)","Clear applicability criteria based on modification status","No conditional logic, exceptions, or cross-references to other legislative provisions","Minimal length with only essential technical references"],"plain_english_summary":"**What this does:** This is a mandatory safety order (called an Airworthiness Directive) issued by the Civil Aviation Safety Authority (CASA) that requires specific safety inspections on De Havilland DHC-1 Chipmunk aircraft.\n\n**Who it affects:** Owners and operators of Chipmunk aircraft that haven't been modified according to factory modifications H66 or H70 (or equivalent approved modifications).\n\n**What it requires:** The tailplane attachment lugs and bulkhead - critical structural parts that connect the horizontal tail to the aircraft body - must be inspected **at every daily inspection** (the routine check pilots or engineers perform before flight).\n\n**Why it matters:** This addresses potential structural weaknesses in the tail attachment points. If these parts fail, the tail could separate from the aircraft with catastrophic consequences. The directive ensures potential cracks or damage are caught early through frequent inspection."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-1-7-tailplane-attachment-lugs-and-bulkhead-inspection","history":"/api/acts/ad-dhc-1-7-tailplane-attachment-lugs-and-bulkhead-inspection/history","analysis":"/api/acts/ad-dhc-1-7-tailplane-attachment-lugs-and-bulkhead-inspection/analysis","conflicts":"/api/acts/ad-dhc-1-7-tailplane-attachment-lugs-and-bulkhead-inspection/conflicts","importantCases":"/api/acts/ad-dhc-1-7-tailplane-attachment-lugs-and-bulkhead-inspection/important-cases","documents":"/api/acts/ad-dhc-1-7-tailplane-attachment-lugs-and-bulkhead-inspection/documents"}}