{"id":"F2006B09112","name":"AD/DHC-6/25 Amdt 1 - Main Undercarriage Platen Attach Link Fittings - Inspection","slug":"ad-dhc-6-25-amdt-1-main-undercarriage-platen-attach-link-fittings-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115665,"registerId":"commonwealth-F2006B09112-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-6/25 Amdt 1 - Main Undercarriage Platen Attach Link Fittings - 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-6 (Twin Otter) Series Aeroplanes\n\n \n\nAD/DHC-6/25\n\nAmdt 1\n\n\nMain Undercarriage Platen Attach Link Fittings - Inspection\n\n\n4/71\n\n \n\nApplicability: All models with S/Nos. 1 to 310 not incorporating Mod. 6/1345. Document:  De Havilland of Canada SB No. 6/226 Rev. A.\n\nCompliance: As detailed in the requirement document.\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1936},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"As Amendment 1 to the original AD/DHC-6/25, this instrument appears to maintain the same narrow scope targeting early-production Twin Otter aircraft (S/Nos. 1-310). The amendment likely updates procedural references or compliance timeframes rather than expanding the class of affected aircraft or the type of inspection required."},"complexity_factors":["External document incorporation: The actual inspection procedures are contained in De Havilland Service Bulletin 6/226 Rev A, not in the directive itself","Technical aviation terminology requiring specialist engineering knowledge (e.g., 'platen attach link fittings', 'Mod. 6/1345')","Narrow applicability criteria combining serial number ranges and modification status exclusions"],"plain_english_summary":"This Airworthiness Directive (AD) requires owners and operators of specific de Havilland DHC-6 Twin Otter aircraft to conduct safety inspections on the **main undercarriage platen attach link fittings**—essentially, the metal links that connect the landing gear to the aircraft body.\n\n**Who it affects**\n- Owners and operators of DHC-6 Twin Otter aircraft with serial numbers 1 through 310\n- Only applies if the aircraft has **not** been modified according to Modification 6/1345\n\n**What it requires**\n- Inspection of the undercarriage attachment fittings as specified in De Havilland Service Bulletin No. 6/226 Rev A\n- Compliance timing follows the schedule set out in that technical document\n\n**Why it matters**\nThese fittings bear the aircraft's weight during landing. If they crack or fail, the landing gear could collapse. This directive ensures older Twin Otter models (early production serial numbers) get checked for metal fatigue or damage before it becomes dangerous."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-6-25-amdt-1-main-undercarriage-platen-attach-link-fittings-inspection","history":"/api/acts/ad-dhc-6-25-amdt-1-main-undercarriage-platen-attach-link-fittings-inspection/history","analysis":"/api/acts/ad-dhc-6-25-amdt-1-main-undercarriage-platen-attach-link-fittings-inspection/analysis","conflicts":"/api/acts/ad-dhc-6-25-amdt-1-main-undercarriage-platen-attach-link-fittings-inspection/conflicts","importantCases":"/api/acts/ad-dhc-6-25-amdt-1-main-undercarriage-platen-attach-link-fittings-inspection/important-cases","documents":"/api/acts/ad-dhc-6-25-amdt-1-main-undercarriage-platen-attach-link-fittings-inspection/documents"}}