{"id":"F2006B08326","name":"AD/CESSNA 400/4 - Engine Support Beam - Modification","slug":"ad-cessna-400-4-engine-support-beam-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115733,"registerId":"commonwealth-F2006B08326-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 400/4 - Engine Support Beam - 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)  Cessna 400 Series Aeroplanes\n\n \n\nAD/CESSNA 400/4 Engine Support Beam - Modification 11/67\n\nApplicability: All model 411 and 411A with S/Nos. up to 411-0254 fitted with unfeathering accumulators.\n\n \n\nDocument: Cessna SL No. 67-34.\n\n \n\nCompliance: Within 50 hours time in service after 30 November 1967.\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":1938},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow technical scope addressing a specific airworthiness issue with engine support beams on specific Cessna models. There is no indication of expansion beyond the original safety modification requirement."},"complexity_factors":["Document contains approximately 80 words with no sections or subsections","No defined terms or interpretation clauses","Single straightforward compliance condition with clear deadline","No cross-references to other legislative provisions","Narrow applicability limited to specific aircraft models and serial numbers"],"plain_english_summary":"**What this is:** A mandatory safety order (called an Airworthiness Directive) requiring owners of specific Cessna aircraft to modify the engine support beam.\n\n**Who it affects:** Owners and operators of Cessna 411 and 411A model aircraft with serial numbers up to 411-0254 that are fitted with unfeathering accumulators (devices that help restart an engine if it stops during flight).\n\n**What must be done:** The engine support beam must be modified according to Cessna Service Letter No. 67-34. This must be done within 50 hours of flight time after 30 November 1967.\n\n**Why it matters:** This ensures the engine support structure meets safety standards and prevents potential structural failures that could affect flight safety."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-400-4-engine-support-beam-modification","history":"/api/acts/ad-cessna-400-4-engine-support-beam-modification/history","analysis":"/api/acts/ad-cessna-400-4-engine-support-beam-modification/analysis","conflicts":"/api/acts/ad-cessna-400-4-engine-support-beam-modification/conflicts","importantCases":"/api/acts/ad-cessna-400-4-engine-support-beam-modification/important-cases","documents":"/api/acts/ad-cessna-400-4-engine-support-beam-modification/documents"}}