{"id":"F2006B08435","name":"AD/CESSNA 550/7 - Anti-Skid Control Box - Modification","slug":"ad-cessna-550-7-anti-skid-control-box-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115921,"registerId":"commonwealth-F2006B08435-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 550/7 - Anti-Skid Control Box - Modification","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 550/7 Anti-Skid Control Box - Modification 1/84\n\nApplicability: All models 550 series aeroplanes with:\n\n \n\nUnit Numbers\n\n \n\n-0178 thru -0436 and\n\n-0002 thru -0177\n\nAND incorporating SB550-32-5\n\n \n\nDocument:  Cessna citation service letter SL550-32-20 Rev.1. Compliance: Before 30 June 1984.\n\nBackground:  To avoid the possibility of reduction in brake pressure at temperatures above 38 degrees C. The reduction of brake pressure may be felt by the pilot as hard brake pedals with little or no braking action.\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":1625},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive remains precisely targeted at correcting a specific thermal-related brake pressure defect in defined Cessna 550 aircraft. It has not expanded beyond its original technical safety scope."},"complexity_factors":["Extremely narrow applicability limited to specific aircraft serial numbers","Single technical reference document for compliance instructions","Unconditional mandate with absolute deadline (no exceptions or alternatives)","Straightforward mechanical safety issue described in plain language"],"plain_english_summary":"Owners/operators of certain Cessna 550 (Citation II) jets are legally required to modify the anti-skid control box per Cessna Service Letter SL550-32-20 Rev 1—but only for aircraft within serials -0002 to -0436 that were previously modified under SB550-32-5. The fix must be completed by 30 June 1984 to prevent a hot‑weather (>38°C) failure that can cause sudden loss of braking."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-550-7-anti-skid-control-box-modification","history":"/api/acts/ad-cessna-550-7-anti-skid-control-box-modification/history","analysis":"/api/acts/ad-cessna-550-7-anti-skid-control-box-modification/analysis","conflicts":"/api/acts/ad-cessna-550-7-anti-skid-control-box-modification/conflicts","importantCases":"/api/acts/ad-cessna-550-7-anti-skid-control-box-modification/important-cases","documents":"/api/acts/ad-cessna-550-7-anti-skid-control-box-modification/documents"}}