{"id":"F2006B08436","name":"AD/CESSNA 550/8 - Nitrogen Bottle Installation - Inspection","slug":"ad-cessna-550-8-nitrogen-bottle-installation-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115923,"registerId":"commonwealth-F2006B08436-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 550/8 - Nitrogen Bottle Installation - Inspection","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 550/8 Nitrogen Bottle Installation - Inspection 7/84\n\nApplicability: All models 550 with unit numbers 0002 to 0488 equipped with nitrogen bottles manufactured by H.T.L. Part Number 9912103-3.\n\n \n\nDocument:  Cessna Citation Service Letter SL550-32-24. Compliance: Before further flight after 31 July 1984.\n\nBackground:  An inspection is required to ensure that an adequate clearance exists at the nitrogen bottle operating lever which might otherwise prevent activation.\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":1684},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow scope from 1984: a specific one-time inspection requirement for a particular manufacturing batch of aircraft components. No evidence of scope creep or expansion beyond the original safety concern regarding nitrogen bottle lever clearance."},"complexity_factors":["Single operational requirement (one inspection task)","No defined terms or interpretation section","Straightforward applicability based on serial numbers and part numbers","No exceptions, conditions, or nested provisions","Clear, absolute compliance deadline"],"plain_english_summary":"**What this is:** A mandatory safety inspection rule (called an Airworthiness Directive) for specific Cessna aircraft.\n\n**Who it affects:** Owners and operators of Cessna 550 (Citation II) aeroplanes with serial numbers 0002 to 0488 that are equipped with nitrogen bottles manufactured by H.T.L. (part number 9912103-3).\n\n**What it requires:** Before flying the aircraft after 31 July 1984, you must inspect the nitrogen bottle operating lever to ensure there is adequate clearance around it. This ensures the lever can move freely and activate the system when needed.\n\n**Why it matters:** If the clearance is too tight, the operating lever could be blocked or fail to move. This could prevent the nitrogen system from activating in an emergency, potentially affecting critical safety systems that rely on nitrogen pressure (such as fire suppression or emergency landing gear extension)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-550-8-nitrogen-bottle-installation-inspection","history":"/api/acts/ad-cessna-550-8-nitrogen-bottle-installation-inspection/history","analysis":"/api/acts/ad-cessna-550-8-nitrogen-bottle-installation-inspection/analysis","conflicts":"/api/acts/ad-cessna-550-8-nitrogen-bottle-installation-inspection/conflicts","importantCases":"/api/acts/ad-cessna-550-8-nitrogen-bottle-installation-inspection/important-cases","documents":"/api/acts/ad-cessna-550-8-nitrogen-bottle-installation-inspection/documents"}}