{"id":"F2006B03968","name":"AD/BEECH 55/19 - Engine Mount Bolt Nuts","slug":"ad-beech-55-19-engine-mount-bolt-nuts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43577,"registerId":"commonwealth-F2006B03968-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 55/19 - Engine Mount Bolt Nuts","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 55, 58 and 95-55 (Baron) Series Aeroplanes\n\n \n\nAD/BEECH 55/19 Engine Mount Bolt Nuts 8/70\n\nApplicability: Models D55, D55A, E55 and E55A, with S/Nos. TE-589 and subsequent and models 58 and 58A with S/Nos. TH-1 and subsequent.\n\n \n\nRequirement: Action in accordance with Beechcraft SI No. 0396-241. Compliance:  Within 25 hours’ time in service after 21 August 1970.\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":2073},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This directive remains tightly scoped to its original purpose: addressing a specific hardware issue on specific Beechcraft Baron aircraft models. There is no evidence of scope expansion beyond the original engine mount bolt nut safety concern."},"complexity_factors":["Extremely short text (under 100 words of substance)","No defined terms or interpretation section","Single external reference to manufacturer service bulletin","Simple applicability test based on aircraft model and serial number only","No exceptions, exemptions, or conditional logic"],"plain_english_summary":"This mandatory Airworthiness Directive requires owners/operators of specified Beechcraft Baron D55/E55/58 series (serials TE‑589+ for 55s; TH‑1+ for 58s) to have engine‑mount bolt nuts inspected/serviced per Beechcraft Service Instruction No. 0396‑241. Compliance was required within 25 flight hours after 21 August 1970. It’s critical because insecure nuts can allow engine separation, posing catastrophic safety risk."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-55-19-engine-mount-bolt-nuts","history":"/api/acts/ad-beech-55-19-engine-mount-bolt-nuts/history","analysis":"/api/acts/ad-beech-55-19-engine-mount-bolt-nuts/analysis","conflicts":"/api/acts/ad-beech-55-19-engine-mount-bolt-nuts/conflicts","importantCases":"/api/acts/ad-beech-55-19-engine-mount-bolt-nuts/important-cases","documents":"/api/acts/ad-beech-55-19-engine-mount-bolt-nuts/documents"}}