{"id":"F2006B09034","name":"AD/DHC-2/17 - Fin Rear Attachment - Inspection","slug":"ad-dhc-2-17-fin-rear-attachment-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52730,"registerId":"commonwealth-F2006B09034-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-2/17 - Fin Rear Attachment - 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)  DHC-2 (Beaver) Series Aeroplanes\n\n \n\nAD/DHC-2/17 Fin Rear Attachment - Inspection 7/72\n\nApplicability: All models.\n\n \n\nDocument: De Havilland Aircraft of Canada SB No. 2/11.\n\n \n\nCompliance: Within 25 hours time in service after 3 August 1972 and thereafter at intervals not exceeding 12 months.\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\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1741},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, original Airworthiness Directive with a narrow technical scope limited to inspection of the fin rear attachment on DHC-2 aircraft. The scope remains precisely constrained to this specific safety requirement without expansion into broader operational or airworthiness areas."},"complexity_factors":["Single aircraft type and specific component scope","Reference to external technical document (Service Bulletin No. 2/11) required to perform the inspection","Aviation-specific defined term 'time in service' assumed knowledge","Simple bifurcated compliance structure (initial inspection + recurring interval)"],"plain_english_summary":"**What this law does:** This Airworthiness Directive (AD) mandates safety inspections of the fin rear attachment—the structural connection between the vertical tail fin and the fuselage—on De Havilland DHC-2 \"Beaver\" aircraft. ADs are legally binding safety orders issued by the Civil Aviation Safety Authority when aircraft defects or unsafe conditions are identified.\n\n**Who it affects:** Owners and operators of all models of DHC-2 Beaver aeroplanes registered in Australia.\n\n**What must be done:**\n- Inspect the fin rear attachment following the procedures outlined in De Havilland Service Bulletin No. 2/11\n- Complete the initial inspection within 25 flight hours (\"time in service\") after 3 August 1972\n- Repeat the inspection at intervals not exceeding 12 months thereafter\n\n**Why it matters:** This prevents potential structural failure of the tail attachment, which could cause loss of aircraft control. Compliance is mandatory and legally enforceable under the Civil Aviation Regulations."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-2-17-fin-rear-attachment-inspection","history":"/api/acts/ad-dhc-2-17-fin-rear-attachment-inspection/history","analysis":"/api/acts/ad-dhc-2-17-fin-rear-attachment-inspection/analysis","conflicts":"/api/acts/ad-dhc-2-17-fin-rear-attachment-inspection/conflicts","importantCases":"/api/acts/ad-dhc-2-17-fin-rear-attachment-inspection/important-cases","documents":"/api/acts/ad-dhc-2-17-fin-rear-attachment-inspection/documents"}}