{"id":"F2006B09138","name":"AD/DHC-6/5 - Fuselage Frame and Wing Strut - Modification","slug":"ad-dhc-6-5-fuselage-frame-and-wing-strut-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115695,"registerId":"commonwealth-F2006B09138-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-6/5 - Fuselage Frame and Wing Strut - 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)  DHC-6 (Twin Otter) Series Aeroplanes\n\n \n\nAD/DHC-6/5 Fuselage Frame and Wing Strut - Modification 8/67\n\nApplicability: All models with S/Nos. 2 to 13, 15 to 22, 24, 26, 27, 29 and 31. Document:  De Havilland of Canada Mod. Bulletin 6/1063.\n\nCompliance: Before 1 July 1968.\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1313},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This directive retains its original narrow technical scope, targeting only specific aircraft serial numbers for a single safety modification. There is no expansion beyond the original airworthiness issue."},"complexity_factors":["Single compliance requirement with no sub-conditions","No defined terms or interpretation sections","Limited applicability restricted to explicitly listed serial numbers","No cross-references to other legislative provisions","Straightforward deadline with no exceptions or extensions mentioned"],"plain_english_summary":"**What it does:** This directive orders a mandatory structural modification to the fuselage frame and wing strut of specific De Havilland Canada DHC-6 (Twin Otter) aircraft.\n\n**Who it affects:** Only owners and operators of DHC-6 aircraft with these specific serial numbers: 2–13, 15–22, 24, 26, 27, 29, and 31. If your aircraft serial number isn't on this list, this rule doesn't apply to you.\n\n**What you must do:** You must complete the modification exactly as described in *De Havilland of Canada Modification Bulletin 6/1063* before **1 July 1968**.\n\n**Why it matters:** This addresses a safety-critical structural issue (likely a design flaw or fatigue problem) that could affect the aircraft's airworthiness. Flying these specific aircraft without making this modification by the deadline would violate aviation safety law."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-6-5-fuselage-frame-and-wing-strut-modification","history":"/api/acts/ad-dhc-6-5-fuselage-frame-and-wing-strut-modification/history","analysis":"/api/acts/ad-dhc-6-5-fuselage-frame-and-wing-strut-modification/analysis","conflicts":"/api/acts/ad-dhc-6-5-fuselage-frame-and-wing-strut-modification/conflicts","importantCases":"/api/acts/ad-dhc-6-5-fuselage-frame-and-wing-strut-modification/important-cases","documents":"/api/acts/ad-dhc-6-5-fuselage-frame-and-wing-strut-modification/documents"}}