{"id":"F2006B08288","name":"AD/CESSNA 400/100 Amdt 4 - Inlet Fuel Valve Assembly","slug":"ad-cessna-400-100-amdt-4-inlet-fuel-valve-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115613,"registerId":"commonwealth-F2006B08288-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 400/100 Amdt 4 - Inlet Fuel Valve Assembly","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nCessna 400 Series Aeroplanes\n\nAD/CESSNA 400/100\n\nAmdt 4\n\n  \nInlet Fuel Valve Assembly 7/95\n\nApplicability: All Cessna 402C S/N 402C0001 thru 402C1020 and 402C689, 404 S/N 404-0001 thru 404-0859, 414A S/N 414A0001 thru 414A1212 and 421C 412C0001 thru\n\n421C1807 series aircraft.\n\nRequirement: 1. Unless previously carried out manufacture a placard with the following words in letters at 3.0 mm in height “ROLLING TURNING TAKEOFFS ARE PROHIBITED”. Install this placard within the pilot’s clear view on the instrument panel.\n\n2. Action in accordance with Cessna Service Bulletin MEB93-10 Revision 1\\. Compliance: 1. By 25 June 1995.\n\n2. As specified in the Requirement Document with a revised effective date of 22 June 1995.\n\nNote: If any valve fails to close during functional testing and an outside stimulus is used to close the valve, such as thumping or bumping the wing near the valve, then the valve has failed the functional test and should be removed and inspected prior to further flight.\n\nBackground: The failure to seal of a fuel inlet valve is suspected to have caused the fatal accident of an overseas Cessna 402C aircraft. Amendment 3 was raised in sequence to advise maintenance staff that Cessna MEB92-13 was being retained as the inspection document following issue of Cessna MEB 92-13 Revision 1. Also that FAA AD 93- 05-03 was an alternate means of compliance.\n\nThis amendment mandates compliance with Revision 1 of Cessna MEB 93-10.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is Amendment 4 to an existing Airworthiness Directive. The amendments have remained tightly focused on the original safety issue — faulty inlet fuel valve assemblies on specific Cessna 400-series aircraft. Amendment 4 simply updates the compliance document to Revision 1 of the service bulletin. The scope has not expanded beyond the original safety concern."},"complexity_factors":["Single, specific technical subject matter (fuel valve assembly on four specific aircraft models)","Only two main requirements with clear compliance dates","Minimal cross-referencing (only to Cessna Service Bulletin MEB93-10 Revision 1)","No nested exceptions or conditional logic beyond the standard 'unless previously carried out' clause","Short document (approximately 250 words)","Only 4 defined applicability criteria (specific serial number ranges for four aircraft models)"],"plain_english_summary":"This AD mandates a cockpit placard prohibiting rolling/turning takeoffs and requires compliance with Cessna Service Bulletin MEB93-10 Rev 1 to inspect/repair inlet fuel valve assemblies on specified Cessna 402C, 404, 414A and 421C serial-numbered aircraft. It affects owners, operators and maintenance engineers of those airplanes. Issued after a fatal accident linked to a fuel inlet valve that failed to seal, the measures prevent fuel starvation risks during takeoff."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This amendment makes compliance with Cessna Service Bulletin MEB93‑10 Revision 1 mandatory and adds a cockpit placard requirement with a firm placard deadline (Requirement 1) and service-bulletin actions (Requirement 2). It therefore narrows/clarifies the compliance mechanism compared with prior guidance that retained earlier inspection documents and listed an FAA AD as an alternate means; the amendment fixes the required document and effective date for operators to follow."},"complexity_factors":["Narrow applicability by specific aircraft model and serial-number ranges (administrative matching required).","Two discrete obligations: manufacture/install placard (low technical burden) and comply with a service bulletin (variable technical/maintenance burden).","Mandatory reference to an external technical document (Cessna MEB93-10 Rev 1) creates dependency on that document for detailed steps and timings.","Deadlines for compliance (placard by 25 June 1995; SB actions per the document with revised effective date) create scheduling constraints for operators and maintenance providers.","Operational restriction (prohibition on rolling/turning takeoffs) changes pilot behaviour and flight planning for affected operators.","Inspection failure procedure requires removal and inspection if valve needs external stimulus to close, adding potential maintenance and grounding time.","Cross-references to earlier amendments and alternate means of compliance (FAA AD) increase interpretive history but the current instrument mandates Rev 1, simplifying long-term compliance determination."],"plain_english_summary":"Requires owners/operators of specified Cessna 402C, 404, 414A and 421C aircraft (listed by serial number) to install a cockpit placard reading “ROLLING TURNING TAKEOFFS ARE PROHIBITED” and to carry out the work set out in Cessna Service Bulletin MEB93‑10 Revision 1. The directive responds to suspected inlet fuel valve failures linked to a fatal accident. Operators pay for the placard and any maintenance; the rule restricts takeoff technique and imposes inspection/repair requirements with specified compliance dates."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-400-100-amdt-4-inlet-fuel-valve-assembly","history":"/api/acts/ad-cessna-400-100-amdt-4-inlet-fuel-valve-assembly/history","analysis":"/api/acts/ad-cessna-400-100-amdt-4-inlet-fuel-valve-assembly/analysis","conflicts":"/api/acts/ad-cessna-400-100-amdt-4-inlet-fuel-valve-assembly/conflicts","importantCases":"/api/acts/ad-cessna-400-100-amdt-4-inlet-fuel-valve-assembly/important-cases","documents":"/api/acts/ad-cessna-400-100-amdt-4-inlet-fuel-valve-assembly/documents"}}