{"id":"F2006B08434","name":"AD/CESSNA 550/6 Amdt 2 - Tailcone Skin and Vertical Fin Spar Interference","slug":"ad-cessna-550-6-amdt-2-tailcone-skin-and-vertical-fin-spar-interference","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115919,"registerId":"commonwealth-F2006B08434-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 550/6 Amdt 2 - Tailcone Skin and Vertical Fin Spar Interference","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nCessna 550 (Citation II) Series Aeroplanes\n\nAD/CESSNA 550/6\n\nAmdt 2\n\n  \n\nTailcone Skin and Vertical Fin Spar Interference\n\n  \n10/85\n\nApplicability: All Models 550 with unit Nos. 0002 to 0219, 0221 to 0225, 0227 to 0410.\n\nRequirement: Action in accordance with Cessna S.B. 550-53-6 Rev. 2 and Cessna S.B. 550-55-2 Rev. 2 (as applicable).\n\nCompliance: Unless already accomplished prior to 30 June 1986.\n\nNote: No further action is required for aircraft previously inspected in accordance with Cessna S.L. 550-53-2 and where no interference was detected.\n\nBackground: The Manufacturer is aware that possible interference between the vertical fin forward spar and the upper tailcone skin may exist on the applicable aircraft.\n\nThis Directive is further amended to extend aircraft applicability.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2470},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"This amendment expands the directive to cover additional aircraft serial numbers compared to previous versions, widening the pool of affected Cessna 550 aircraft that must comply."},"complexity_factors":["Requires consultation of external technical documents (Cessna Service Bulletins) not contained within the directive itself","Disjointed aircraft serial number applicability (three separate non-consecutive ranges)","Conditional exemption clause based on prior inspection history under a different service letter","Technical aviation terminology requiring specialized engineering knowledge to interpret fully"],"plain_english_summary":"This safety directive requires owners/operators of certain Cessna 550 Citation II jets (specified serial-number ranges) to inspect the tail for interference between the vertical fin and tailcone skin, using the applicable Cessna service bulletins. It included a past compliance date and allowed exemption if an earlier service-letter inspection found no interference. The inspections prevent fin/tailcone structural damage that could compromise flight safety."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-550-6-amdt-2-tailcone-skin-and-vertical-fin-spar-interference","history":"/api/acts/ad-cessna-550-6-amdt-2-tailcone-skin-and-vertical-fin-spar-interference/history","analysis":"/api/acts/ad-cessna-550-6-amdt-2-tailcone-skin-and-vertical-fin-spar-interference/analysis","conflicts":"/api/acts/ad-cessna-550-6-amdt-2-tailcone-skin-and-vertical-fin-spar-interference/conflicts","importantCases":"/api/acts/ad-cessna-550-6-amdt-2-tailcone-skin-and-vertical-fin-spar-interference/important-cases","documents":"/api/acts/ad-cessna-550-6-amdt-2-tailcone-skin-and-vertical-fin-spar-interference/documents"}}