{"id":"F2006B03949","name":"AD/BEECH 50/25 - Engine Mount Bolt Nuts","slug":"ad-beech-50-25-engine-mount-bolt-nuts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43558,"registerId":"commonwealth-F2006B03949-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 50/25 - Engine Mount Bolt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 50 (Twin Bonanza) Series Aeroplanes\n\n \n\nAD/BEECH 50/25 Engine Mount Bolt Nuts 5/73\n\nApplicability: All models.\n\n \n\nRequirement: Action in accordance with Beechcraft SI No. 0396-241, Rev. 1. Compliance:  Within 100 hours’ time in service after 31 May 1973.\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":1389},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The directive retains its original narrow, technical scope: addressing a specific hardware defect (engine mount bolt nuts) on a specific aircraft series. No expansion beyond the original airworthiness safety purpose is evident."},"complexity_factors":["Single requirement referencing one external technical standard","No definitions section or interpretive provisions","Simple applicability clause covering all models of one aircraft type","Clear, single-layer compliance condition (time-in-service deadline)","No exceptions, exemptions, or conditional provisions"],"plain_english_summary":"This is a **safety order** for owners and operators of **Beechcraft 50 (Twin Bonanza) aircraft**.\n\n**What you must do:**\nFollow the manufacturer's technical instruction (Beechcraft Service Instruction No. 0396-241, Revision 1) regarding the nuts used on engine mount bolts.\n\n**Who it affects:**\nAnyone operating any model of the Beechcraft 50 series.\n\n**Deadline:**\nComplete the work within 100 hours of flying time after 31 May 1973.\n\n**Why it matters:**\nEngine mounts attach the engine to the aircraft wing. If the nuts securing these bolts fail, the engine could detach in flight. This directive mandates a specific fix to prevent mechanical failure and ensure the aircraft remains safe to fly."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-50-25-engine-mount-bolt-nuts","history":"/api/acts/ad-beech-50-25-engine-mount-bolt-nuts/history","analysis":"/api/acts/ad-beech-50-25-engine-mount-bolt-nuts/analysis","conflicts":"/api/acts/ad-beech-50-25-engine-mount-bolt-nuts/conflicts","importantCases":"/api/acts/ad-beech-50-25-engine-mount-bolt-nuts/important-cases","documents":"/api/acts/ad-beech-50-25-engine-mount-bolt-nuts/documents"}}