{"id":"F2006B04049","name":"AD/BEECH 56/19 - Fuselage Bulkheads FS 257.6 and FS 271.92","slug":"ad-beech-56-19-fuselage-bulkheads-fs-257-6-and-fs-271-92","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43667,"registerId":"commonwealth-F2006B04049-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 56/19 - Fuselage Bulkheads FS 257.6 and FS 271.92","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 56/19 Fuselage Bulkheads FS 257.6 and FS 271.92 4/79\n\nApplicability: All models 56TC and A56TC with S/Nos. TG-2 to TG-94. Requirement:  Action in accordance with Beechcraft SI NO. 0990.\n\nCompliance: Initially inspect within 100 hours’ time in service after 30 April 1979 and thereafter at intervals not exceeding 500 hours’ time in service or 1 year whichever occurs first.\n\n \n\nBackground: Cracks may develop in the subject bulkheads in the areas of the horizontal stabiliser attachments.\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":1693},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow scope, targeting specific structural inspections on specific aircraft models to address a known cracking issue. No evidence of scope expansion beyond the original safety purpose of detecting cracks at horizontal stabiliser attachment points."},"complexity_factors":["Short, single-requirement directive with no internal cross-references or subsections","Heavy reliance on external technical document (Beechcraft SI NO. 0990) for actual inspection procedures","Technical aviation terminology requires specialist knowledge (e.g., 'FS 257.6' refers to a specific frame station measurement)","Specific applicability limited to narrow aircraft model and serial number range reduces general complexity","Clear, absolute compliance deadlines with simple alternative intervals (500 hours vs 1 year)"],"plain_english_summary":"**What this is:** A safety rule requiring regular inspections of specific structural parts on certain Beechcraft aircraft to prevent dangerous cracks.\n\n**Who it affects:** Owners and operators of Beechcraft 56TC and A56TC aeroplanes with serial numbers TG-2 through TG-94.\n\n**What you must do:** Inspect two specific fuselage bulkheads (structural frames at positions FS 257.6 and FS 271.92) for cracks, following the technical procedures in Beechcraft Service Instruction No. 0990.\n\n**When to do it:**\n- **First check:** Within 100 hours of flying time after 30 April 1979\n- **Repeat checks:** Every 500 flight hours **or** once per year, whichever comes first\n\n**Why this matters:** Cracks can develop where the horizontal stabiliser (the tail wing) attaches to the fuselage. If undetected, these cracks could compromise the aircraft's structural integrity and safety."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-56-19-fuselage-bulkheads-fs-257-6-and-fs-271-92","history":"/api/acts/ad-beech-56-19-fuselage-bulkheads-fs-257-6-and-fs-271-92/history","analysis":"/api/acts/ad-beech-56-19-fuselage-bulkheads-fs-257-6-and-fs-271-92/analysis","conflicts":"/api/acts/ad-beech-56-19-fuselage-bulkheads-fs-257-6-and-fs-271-92/conflicts","importantCases":"/api/acts/ad-beech-56-19-fuselage-bulkheads-fs-257-6-and-fs-271-92/important-cases","documents":"/api/acts/ad-beech-56-19-fuselage-bulkheads-fs-257-6-and-fs-271-92/documents"}}