{"id":"F2006B04025","name":"AD/BEECH 55/8 - Dorsal Fin","slug":"ad-beech-55-8-dorsal-fin","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43634,"registerId":"commonwealth-F2006B04025-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 55/8 - Dorsal Fin","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 55/8 Dorsal Fin 11/67\n\nApplicability: Model 95-B55 with S/Nos. TC-955 to TC-1015 and Model 95-C55 with S/Nos. TE-1 to TE-219.\n\n \n\nRequirement: Action in accordance with Beechcraft SB 66-16.\n\n \n\nCompliance: Inspect at intervals not exceeding 100 hours’ time in service until modified. Modify within the next 500 hours’ time in service after 15 March 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","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1959},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, standalone directive from 1967 focused solely on dorsal fin safety for specific Beechcraft Baron models. The scope remains strictly limited to the original airworthiness issue and has not expanded beyond these aircraft types."},"complexity_factors":["Very short length (single page)","Specific, limited applicability (only two aircraft models with defined serial number ranges)","Single cross-reference to external technical document (Service Bulletin 66-16)","Simple compliance structure with clear intervals (100 hours for inspections, 500 hours for modification)"],"plain_english_summary":"**What this is:** A mandatory safety directive (called an Airworthiness Directive) issued by the Civil Aviation Safety Authority for specific Beechcraft Baron aircraft.\n\n**Who it affects:** Owners and operators of Beechcraft Model 95-B55 (serial numbers TC-955 to TC-1015) and Model 95-C55 (serial numbers TE-1 to TE-219).\n\n**What it requires:**\n*   **Inspect** the aircraft's dorsal fin (the vertical fin on the top of the tail) at least every 100 hours of flight time.\n*   **Modify** the dorsal fin according to Beechcraft Service Bulletin 66-16 within 500 flight hours after 15 March 1967.\n\n**Why it matters:** This directive addresses potential safety issues with the dorsal fin structure. The recurring inspections act as a temporary safety measure until the permanent modification is completed."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-55-8-dorsal-fin","history":"/api/acts/ad-beech-55-8-dorsal-fin/history","analysis":"/api/acts/ad-beech-55-8-dorsal-fin/analysis","conflicts":"/api/acts/ad-beech-55-8-dorsal-fin/conflicts","importantCases":"/api/acts/ad-beech-55-8-dorsal-fin/important-cases","documents":"/api/acts/ad-beech-55-8-dorsal-fin/documents"}}