{"id":"F2006B05101","name":"AD/CESSNA 185/11 - Non-Return Valves in Electric Fuel Pump Bypass Line","slug":"ad-cessna-185-11-non-return-valves-in-electric-fuel-pump-bypass-line","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45085,"registerId":"commonwealth-F2006B05101-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 185/11 - Non-Return Valves in Electric Fuel Pump Bypass Line","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 185 Series Aeroplanes\n\n \n\n# AD/CESSNA 185/11 Non-Return Valves in Electric\n\nFuel Pump Bypass Line Applicability: All models with dual Bendix auxiliary fuel pump installation. Requirement:              1. Identify the electric fuel pumps bypass non-return valve.\n\n# 10/66\n\n2.    If the non-return valve is Republic Manufacturing Company P/N 485-6D-1, modify or replace as required in paragraph 4 or 5.\n\n \n\n3.    If the non-return valve is other than Republic P/N 485-6D-1, test the valve in situ, as called up in Section 13 of the Cessna 100 Series Service Manual for trouble shooting the fuel system of the Model 185. Where the suspected cause is a defective check valve in the electric fuel pumps bypass line disconnect the outlet and inlet lines from the non-return valve. If fuel flows from the inlet line but not through the valve, the valve is defective and must be rectified or replaced.\n\n \n\n4.    Modify the non-return valve in accordance with an approved scheme to ensure that the opening pressure is not greater than 8 inches of water, and permanently mark on the valve “OPENS 8 in. WATER”.\n\n \n\n5.    Alternatively, replace Republic P/N 485-6D-1 valve by Parker aircraft Company valve P/N 1111-517702 or Dukes Astronautics Valve P/N 367-00 and rework the system in accordance with the attached Figure 1.\n\n \n\nCompliance: Before 1 January 1967.\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.002.png)  \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1477},"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"The directive remains narrowly focused on its original purpose: addressing the specific safety defect identified in non-return valves within dual Bendix auxiliary fuel pump installations. It has not expanded beyond this specific mechanical compliance requirement."},"complexity_factors":["References three specific manufacturer part numbers (Republic P/N 485-6D-1, Parker P/N 1111-517702, Dukes P/N 367-00)","Requires cross-referencing external technical documentation (Cessna 100 Series Service Manual, Section 13)","Contains precise engineering specification (8 inches of water opening pressure)","Conditional compliance pathways based on installed equipment type","Technical in-situ testing procedure described"],"plain_english_summary":"This Airworthiness Directive applies to owners/operators of Cessna 185s with dual Bendix auxiliary fuel pumps and requires inspection and testing of the electric pump bypass one‑way (non‑return) valve, with mandated modification or replacement for certain valve types.\n\nIt matters because a faulty valve can allow fuel to flow backward or block proper fuel flow, risking pump failure and possible engine shutdown in flight."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-185-11-non-return-valves-in-electric-fuel-pump-bypass-line","history":"/api/acts/ad-cessna-185-11-non-return-valves-in-electric-fuel-pump-bypass-line/history","analysis":"/api/acts/ad-cessna-185-11-non-return-valves-in-electric-fuel-pump-bypass-line/analysis","conflicts":"/api/acts/ad-cessna-185-11-non-return-valves-in-electric-fuel-pump-bypass-line/conflicts","importantCases":"/api/acts/ad-cessna-185-11-non-return-valves-in-electric-fuel-pump-bypass-line/important-cases","documents":"/api/acts/ad-cessna-185-11-non-return-valves-in-electric-fuel-pump-bypass-line/documents"}}