{"id":"F2006B08396","name":"AD/CESSNA 500/21 - Nitrogen Bottle Installation - Inspection","slug":"ad-cessna-500-21-nitrogen-bottle-installation-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115840,"registerId":"commonwealth-F2006B08396-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 500/21 - Nitrogen Bottle Installation -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 500 (Citation) Series Aeroplanes\n\n \n\nAD/CESSNA 500/21 Nitrogen Bottle Installation - Inspection 7/84\n\nApplicability: All models 500 and 501 with unit numbers 0001 to 0676 equipped with nitrogen bottles manufactured by H.T.L. Part Number 9912103-3.\n\n \n\nDocument:  Cessna Citation Service Letter SL32-36. 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":1367},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow scope targeting a specific mechanical defect in identified aircraft configurations. There is no evidence of scope creep or expansion beyond the original safety issue regarding nitrogen bottle lever clearance."},"complexity_factors":["Extremely brief document (under 150 words of substantive content)","Single, unambiguous action required (physical inspection)","Applicability determined by specific serial number and part number ranges","No definitions, cross-references, or interpretive provisions","Absolute deadline with no exceptions or extensions mentioned"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Cessna 500/501 Citation jets (serials 0001–0676) fitted with H.T.L. nitrogen bottles (P/N 9912103-3) to perform a one‑time inspection of the bottle operating lever per Cessna Service Letter SL32‑36 before next flight after 31 July 1984. It ensures sufficient clearance so the lever can be operated in an emergency; without it the nitrogen system may be un‑activatable, risking catastrophic failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-500-21-nitrogen-bottle-installation-inspection","history":"/api/acts/ad-cessna-500-21-nitrogen-bottle-installation-inspection/history","analysis":"/api/acts/ad-cessna-500-21-nitrogen-bottle-installation-inspection/analysis","conflicts":"/api/acts/ad-cessna-500-21-nitrogen-bottle-installation-inspection/conflicts","importantCases":"/api/acts/ad-cessna-500-21-nitrogen-bottle-installation-inspection/important-cases","documents":"/api/acts/ad-cessna-500-21-nitrogen-bottle-installation-inspection/documents"}}