{"id":"F2006B08418","name":"AD/CESSNA 550/13 - Bleed Air Check Valve","slug":"ad-cessna-550-13-bleed-air-check-valve","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115886,"registerId":"commonwealth-F2006B08418-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 550/13 - Bleed Air Check Valve","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)  Cessna 550 (Citation II) Series Aeroplanes\n\n \n\nAD/CESSNA 550/13 Bleed Air Check Valve 9/86\n\nApplicability: All model 550 with unit numbers -0002 to -0505, and All model S550 with unit numbers -0001 to -0034.\n\n \n\nRequirement: Inspect and modify in accordance with Cessna Service Bulletins S.B. 550-36-2 and S.B. S550-36-1.\n\n \n\nCompliance: At the next scheduled maintenance period or phase inspection after 30 September 1986.\n\n \n\nBackground: The existing valves have experienced malfunctions and have been replaced by a modified valve.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n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":2066},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is the original directive as issued, maintaining its narrow scope targeted at specific aircraft serial numbers for the specific safety issue of bleed air check valve malfunction."},"complexity_factors":["Requires cross-referencing external technical documents (Cessna Service Bulletins S.B. 550-36-2 and S.B. S550-36-1) for implementation details","Narrow applicability restricted to specific aircraft serial number ranges","Single, straightforward compliance condition tied to maintenance scheduling"],"plain_english_summary":"If you operate a Cessna Citation II (Model 550 serials -0002 to -0505, or S550 serials -0001 to -0034), you must have the original bleed air check valves inspected and modified because the factory valves are prone to malfunction. \n\nHave your mechanic perform the inspection/modification per Cessna Service Bulletins S.B. 550-36-2 / S.B. S550-36-1 at the next scheduled maintenance or phase inspection after 30 September 1986."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-550-13-bleed-air-check-valve","history":"/api/acts/ad-cessna-550-13-bleed-air-check-valve/history","analysis":"/api/acts/ad-cessna-550-13-bleed-air-check-valve/analysis","conflicts":"/api/acts/ad-cessna-550-13-bleed-air-check-valve/conflicts","importantCases":"/api/acts/ad-cessna-550-13-bleed-air-check-valve/important-cases","documents":"/api/acts/ad-cessna-550-13-bleed-air-check-valve/documents"}}