{"id":"F2006B08368","name":"AD/CESSNA 400/84 - Fuel Filter - Inspection and Modification","slug":"ad-cessna-400-84-fuel-filter-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115783,"registerId":"commonwealth-F2006B08368-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 400/84 - Fuel Filter - Inspection and 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 400 Series Aeroplanes\n\n \n\nAD/CESSNA 400/84 Fuel Filter - Inspection and Modification 3/82\n\nApplicability: Model 402 with S/Nos. 402C0001 to 402C0505. Model 404 with S/Nos. 404-0203 to 404-0847. Model 414 with S/Nos. 414A0001 to 414A0667. Model 421 with S/Nos. 421C0401 to 421C1087.\n\nDocument: Cessna SIL No. ME81-36.\n\n \n\nCompliance: Within 100 hours time in service after 31 March 1982.\n\n \n\nBackground: A number of fuel filter assemblies have been found with loose bypass valve ball seats.\n\nThis may result in contaminants bypassing the filter and blocking the fuel metering unit inlet screen.\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":1870},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This appears to be the original 1982 directive establishing the fuel filter inspection requirement. There is no indication of subsequent amendments or scope creep beyond the initial safety mandate."},"complexity_factors":["Extremely brief text (under 150 words of substantive content)","No defined terms, interpretation clauses, or legislative cross-references","Single, unambiguous compliance requirement with a clear mechanical deadline","Applicability limited to four specific aircraft models with enumerated serial number ranges","Relies on external technical document (Cessna SIL) for actual modification procedures"],"plain_english_summary":"This Airworthiness Directive orders owners/operators of specific late‑1970s/early‑1980s Cessna twins (models 402, 404, 414, 421 within the listed serial ranges) to inspect and modify the fuel filter assembly per Cessna Service Information Letter ME81‑36.\n\nAction is required within 100 flight hours after 31 March 1982 to fix loose bypass valve seats that could let contaminants bypass the filter and cause engine power loss or failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-400-84-fuel-filter-inspection-and-modification","history":"/api/acts/ad-cessna-400-84-fuel-filter-inspection-and-modification/history","analysis":"/api/acts/ad-cessna-400-84-fuel-filter-inspection-and-modification/analysis","conflicts":"/api/acts/ad-cessna-400-84-fuel-filter-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-cessna-400-84-fuel-filter-inspection-and-modification/important-cases","documents":"/api/acts/ad-cessna-400-84-fuel-filter-inspection-and-modification/documents"}}