{"id":"F2006B09158","name":"AD/DHC-6/70 - Horizontal Stabiliser - Centre Hinge Bracket Flange","slug":"ad-dhc-6-70-horizontal-stabiliser-centre-hinge-bracket-flange","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52861,"registerId":"commonwealth-F2006B09158-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-6/70 - Horizontal Stabiliser - Centre Hinge Bracket Flange","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-6/70 Horizontal Stabiliser - Centre Hinge Bracket Flange 5/95\n\nApplicability: All DHC-6 Model aircraft.\n\n \n\nRequirement:  Fluorescent dye penetrant inspect all flanges of Horizontal Stabiliser Hinge Bracket P/N C6TPM1021. Inspect in accordance with de Havilland Canada Service Bulletin 6/512 Revision 1.\n\n \n\nNote: Transport Canada AD CF-92-05 refers.\n\n \n\nCompliance:  Initially inspect within 250 hours time in service after 27 April 1995. Re-inspect at intervals not to exceed 1200 hours time in service.\n\n \n\nThe repeat inspections are required regardless of hinge bracket replacement.\n\n \n\nBackground:  In-service cracking has been reported in the horizontal stabiliser centre hinge bracket flange.\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1435},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive remains targeted at its original purpose—addressing a specific structural defect discovered in DHC-6 aircraft hinge brackets. It has not expanded beyond the single safety issue identified in the background section."},"complexity_factors":["Single mechanical component targeted with specific part number (C6TPM1021)","Clear compliance timeline (initial inspection + recurring 1200-hour intervals)","Reference to external technical standard (Service Bulletin) rather than lengthy regulatory text","No exemptions, exceptions, or conditional provisions","Only one inspection method specified"],"plain_english_summary":"This AD requires operators of all DHC‑6 Twin Otter aircraft to perform fluorescent dye penetrant inspections of the horizontal stabiliser centre hinge bracket flange (part C6TPM1021) to detect cracks that could cause loss of pitch control. \n\nInspections start within 250 flight hours after 27 April 1995 and recur every 1,200 hours; inspections must continue even if the bracket is replaced. The directive aligns Australian Twin Otter safety with the referenced Canadian AD."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-6-70-horizontal-stabiliser-centre-hinge-bracket-flange","history":"/api/acts/ad-dhc-6-70-horizontal-stabiliser-centre-hinge-bracket-flange/history","analysis":"/api/acts/ad-dhc-6-70-horizontal-stabiliser-centre-hinge-bracket-flange/analysis","conflicts":"/api/acts/ad-dhc-6-70-horizontal-stabiliser-centre-hinge-bracket-flange/conflicts","importantCases":"/api/acts/ad-dhc-6-70-horizontal-stabiliser-centre-hinge-bracket-flange/important-cases","documents":"/api/acts/ad-dhc-6-70-horizontal-stabiliser-centre-hinge-bracket-flange/documents"}}