{"id":"F2006B04066","name":"AD/BEECH 56/4 - Nacelle Side Brace Ribs","slug":"ad-beech-56-4-nacelle-side-brace-ribs","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43701,"registerId":"commonwealth-F2006B04066-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 56/4 - Nacelle Side Brace Ribs","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)  Beechcraft 56TC (Turbo Baron) Series Aeroplanes\n\n \n\nAD/BEECH 56/4 Nacelle Side Brace Ribs 12/68\n\nApplicability: Model 56TC with S/Nos. TG-1 to TG-66 except TG-1, TG-5, TG-16, TG-19, TG-27, TG-34, TG-54, also excepting those aircraft modified in accordance with\n\nSI 0094-063.\n\n \n\nRequirement: Action in accordance with Beechcraft SI No. 0094-063.\n\n \n\nCompliance: Within 100 hours’ time in service after 26 December 1968 and there-after at intervals not exceeding 200 hours’ time in service until modified.\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":1103},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This appears to be the original 1968 directive maintaining its original scope. It addresses a specific structural defect in a limited production run of aircraft and has not expanded beyond the original safety-critical inspection requirement for nacelle side brace ribs."},"complexity_factors":["Multiple serial number exceptions (8 specific exclusions)","Reference to external technical document (Beechcraft SI 0094-063) not reproduced in the directive","Technical aviation terminology requiring domain knowledge ('time in service', 'nacelle')"],"plain_english_summary":"This mandatory airworthiness directive requires owners of Beechcraft Model 56TC (serials TG‑1 through TG‑66, except TG‑1, TG‑5, TG‑16, TG‑19, TG‑27, TG‑34, TG‑54, and those already modified per Service Instruction 0094‑063) to inspect and repair nacelle side brace ribs per Beechcraft Service Instruction No. 0094‑063.\n\nInspections are required within 100 flight hours after 26 Dec 1968 and every 200 hours thereafter until permanently modified to prevent possible wing‑to‑engine structural failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-56-4-nacelle-side-brace-ribs","history":"/api/acts/ad-beech-56-4-nacelle-side-brace-ribs/history","analysis":"/api/acts/ad-beech-56-4-nacelle-side-brace-ribs/analysis","conflicts":"/api/acts/ad-beech-56-4-nacelle-side-brace-ribs/conflicts","importantCases":"/api/acts/ad-beech-56-4-nacelle-side-brace-ribs/important-cases","documents":"/api/acts/ad-beech-56-4-nacelle-side-brace-ribs/documents"}}