{"id":"F2006B05311","name":"AD/CESSNA 208/4 - Wing Fuel Tanks External Sump","slug":"ad-cessna-208-4-wing-fuel-tanks-external-sump","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45748,"registerId":"commonwealth-F2006B05311-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 208/4 - Wing Fuel Tanks External Sump","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 208 Series Aeroplanes\n\n \n\nAD/CESSNA 208/4 Wing Fuel Tanks External Sump 11/88\n\nApplicability: Models 208 and 208A with serial numbers: 20800001 through 20800130.\n\n \n\nModel 208B with serial numbers: 208B0001 through 208B0089.\n\n \n\nRequirement: Action in accordance with Cessna SB No. CAB 88-23. Compliance:  Prior to 31 May 1989.\n\nBackground:  Installation of external sumps to the fuel tanks will assist in collecting contaminants that should be drained from the tanks.\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":1877},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow scope as a targeted safety modification addressing a specific design flaw in early Cessna 208 series fuel systems. It has not expanded beyond its initial purpose of mandating external sump installation."},"complexity_factors":["Single, specific mechanical requirement with no sub-conditions or exceptions","Limited applicability defined by specific aircraft serial number ranges only","Very short document length (under 150 words of substantive content)","Technical procedure incorporated by reference to external manufacturer document rather than detailed within the directive itself"],"plain_english_summary":"**What this is:** A mandatory safety order (called an Airworthiness Directive) requiring owners of specific Cessna aircraft to modify their wing fuel tanks.\n\n**Who it affects:** Owners and operators of Cessna 208, 208A, and 208B aeroplanes with specific serial numbers—specifically early production models (serial numbers 20800001 through 20800130 for the 208/208A, and 208B0001 through 208B0089 for the 208B).\n\n**What you must do:** Install external sumps (drain collection points) on the wing fuel tanks according to the manufacturer's instructions in **Cessna Service Bulletin No. CAB 88-23**. This modification had to be completed before 31 May 1989.\n\n**Why it matters:** The external sumps help collect contaminants—such as water, dirt, or debris—that accumulate in fuel tanks. This allows pilots to drain these contaminants during pre-flight checks, preventing contaminated fuel from reaching the engine and potentially causing engine failure or other serious safety hazards."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-208-4-wing-fuel-tanks-external-sump","history":"/api/acts/ad-cessna-208-4-wing-fuel-tanks-external-sump/history","analysis":"/api/acts/ad-cessna-208-4-wing-fuel-tanks-external-sump/analysis","conflicts":"/api/acts/ad-cessna-208-4-wing-fuel-tanks-external-sump/conflicts","importantCases":"/api/acts/ad-cessna-208-4-wing-fuel-tanks-external-sump/important-cases","documents":"/api/acts/ad-cessna-208-4-wing-fuel-tanks-external-sump/documents"}}