{"id":"F2006B08363","name":"AD/CESSNA 400/8 - Fuel Lines - Modification and Inspection","slug":"ad-cessna-400-8-fuel-lines-modification-and-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115772,"registerId":"commonwealth-F2006B08363-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 400/8 - Fuel Lines - Modification and 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 400 Series Aeroplanes\n\n \n\nAD/CESSNA 400/8 Fuel Lines - Modification and Inspection 4/69\n\nApplicability: All model 401, 401A and 402 with S/Nos. 401-0001 to 401-0322 and 401A-0001 to 401A-0010 and 402-0001 to 402-0319.\n\n \n\nDocument: Cessna SL ME68-27.\n\n \n\nCompliance: Within 100 hours time in service after 21 May 1969.\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\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument’s scope is confined to the specific Cessna 401, 401A and 402 serial numbers listed in the Applicability and requires modification/inspection of fuel lines per Cessna SL ME68‑27 within 100 hours TIS after 21 May 1969 (Applicability; Document; Compliance). There is no text in the instrument indicating an expansion or narrowing of that scope from the original stated requirement."},"complexity_factors":["Narrow applicability limited to specific serial numbers (Applicability) which reduces scope complexity.","Clear, single action requirement (modify and inspect fuel lines) with a single compliance deadline (Compliance).","Reference to an external technical document (Cessna SL ME68‑27) adds a dependency on that document for implementation detail (Document).","Regulatory enforcement is straightforward (mandatory compliance within set hours) with limited procedural discretion in the AD text itself."],"plain_english_summary":"This airworthiness directive (AD/CESSNA 400/8) requires owners and maintenance organisations to modify and inspect fuel lines on specified Cessna 401, 401A and 402 serial numbers, following Cessna Service Letter ME68‑27. \n\nIssued by CASA, compliance is mandatory within 100 hours time‑in‑service after 21 May 1969, shifting costs and scheduling burdens onto the affected operators and their maintenance providers."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in specific aircraft. It has not expanded beyond its original purpose of mandating fuel line modifications for the identified Cessna models."},"complexity_factors":["Very short document (under 200 words)","Only 4 defined elements: applicability (aircraft models/serial numbers), reference document, compliance deadline, and subject matter","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","Single, unambiguous compliance requirement with clear deadline","No conditional logic, exceptions, or nested provisions"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\n- Requires owners and operators of certain **Cessna 400 series aeroplanes** (models 401, 401A, and 402 with specific serial numbers) to modify and inspect their **fuel lines**.\n- The work must follow the technical instructions in **Cessna Service Letter ME68-27**.\n\n**Who it affects:**\n- Owners and operators of approximately 652 Cessna aircraft (based on the serial number ranges listed).\n- Specifically: Model 401 (serial numbers 0001–0322), 401A (0001–0010), and 402 (0001–0319).\n\n**Why it matters:**\n- Fuel line failures can cause engine stoppage or fires. This AD addresses a known safety defect before it causes accidents.\n- **Compliance is mandatory** — aircraft cannot legally fly until the work is done within 100 hours of flight time after 21 May 1969.\n\n**Key deadline:** The modification and inspection had to be completed within **100 hours of flying time** after 21 May 1969."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-400-8-fuel-lines-modification-and-inspection","history":"/api/acts/ad-cessna-400-8-fuel-lines-modification-and-inspection/history","analysis":"/api/acts/ad-cessna-400-8-fuel-lines-modification-and-inspection/analysis","conflicts":"/api/acts/ad-cessna-400-8-fuel-lines-modification-and-inspection/conflicts","importantCases":"/api/acts/ad-cessna-400-8-fuel-lines-modification-and-inspection/important-cases","documents":"/api/acts/ad-cessna-400-8-fuel-lines-modification-and-inspection/documents"}}