{"id":"F2006B08421","name":"AD/CESSNA 550/16 - Fuel Flow Transmitter","slug":"ad-cessna-550-16-fuel-flow-transmitter","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115892,"registerId":"commonwealth-F2006B08421-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 550/16 - Fuel Flow Transmitter","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 550 (Citation II) Series Aeroplanes\n\n \n\nAD/CESSNA 550/16 Fuel Flow Transmitter 9/89\n\nApplicability: All Citation 550/551 aircraft S/No’s 0002 thru 0207 and 0209. Requirement:  Replace fuel flow transmitters in accordance with Cessna SB 550-73-1.\n\nNote: SB 550-73-2 also refers.\n\n \n\nCompliance: Within 100 hrs time in service after 7 September 1989.\n\n \n\nBackground: The fuel flow transmitter may have an electrical connector manufactured from two pieces which may separate causing a fuel leak.\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":1491},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow scope targeting a specific mechanical defect in specific aircraft serial numbers. There is no evidence of scope creep or expansion beyond the original safety issue regarding fuel flow transmitter connectors."},"complexity_factors":["Single, straightforward mechanical requirement with no conditional logic or exceptions","References to external technical documents (Service Bulletins) rather than detailed technical specifications within the text","Limited applicability scope defined by specific aircraft serial numbers only","Minimal legislative cross-references (only mentions governing Regulations 1998, Part 39)"],"plain_english_summary":"**What this is:** A mandatory safety instruction (called an Airworthiness Directive) for owners and operators of specific Cessna Citation II business jets.\n\n**What it requires:** If you own or operate a Cessna 550 or 551 aircraft with serial numbers between 0002–0207 or 0209, you must replace the fuel flow transmitter (a device that measures how much fuel is being used by the engine). This must be done following the manufacturer's technical instructions in Cessna Service Bulletin 550-73-1.\n\n**Why it matters:** The original fuel flow transmitter has a dangerous design flaw. Its electrical connector is made in two pieces that can come apart, causing fuel to leak. This creates a fire risk and could lead to engine failure.\n\n**Deadline:** You must complete this replacement within 100 hours of flight time after 7 September 1989.\n\n**Who is affected:** Operators of specific Cessna Citation II aircraft built within a certain serial number range."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-550-16-fuel-flow-transmitter","history":"/api/acts/ad-cessna-550-16-fuel-flow-transmitter/history","analysis":"/api/acts/ad-cessna-550-16-fuel-flow-transmitter/analysis","conflicts":"/api/acts/ad-cessna-550-16-fuel-flow-transmitter/conflicts","importantCases":"/api/acts/ad-cessna-550-16-fuel-flow-transmitter/important-cases","documents":"/api/acts/ad-cessna-550-16-fuel-flow-transmitter/documents"}}