{"id":"F2006B05279","name":"AD/CESSNA 207/20 - Fuel Flow Stabilisation Placard","slug":"ad-cessna-207-20-fuel-flow-stabilisation-placard","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45660,"registerId":"commonwealth-F2006B05279-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 207/20 - Fuel Flow Stabilisation Placard","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 207 Series Aeroplanes\n\n \n\nAD/CESSNA 207/20 Fuel Flow Stabilisation Placard 10/79\n\nApplicability: Model 207 with S/Nos 20700001 to 20700530.\n\n \n\nRequirement: Action in accordance with Cessna SIL No SE79-25, Supplement No 1.\n\n \n\nNote: FAA AD 79-15-01, Amendment 39-3517 refers.\n\n \n\nCompliance: Within 100 hours time in service after 31 October 1979.\n\n \n\nBackground: The manufacturer has made placards and instructions available to aid in the recognition and elimination of excessive vapour from the aircraft fuel system. In the event of inflight power interruptions engine restart procedures are also detailed.\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":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted airworthiness directive addressing a specific safety issue (fuel vapour) in a specific aircraft model range. It has not expanded beyond its original purpose of mandating a cockpit placard and associated procedures."},"complexity_factors":["Very short document (approximately 150 words)","Only 1 defined applicability criterion (serial number range)","Single straightforward requirement referencing an external manufacturer document (Cessna SIL No SE79-25)","Simple compliance deadline (100 hours time in service after fixed date)","No nested conditions, exceptions, or cross-references to other legislation","Background explanation provided in plain language"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) issued by Australia's Civil Aviation Safety Authority for specific **Cessna 207 aircraft**.\n\n**What it does:**\n- Requires owners/operators of Cessna 207 planes with serial numbers 20700001 through 20700530 to install a **placard** (a warning/instruction sign) in the cockpit\n- The placard helps pilots recognise and fix problems with **fuel vapour** in the fuel system\n- It also provides instructions for restarting the engine if it cuts out during flight due to these fuel issues\n\n**Who must follow this:**\n- Anyone operating the affected Cessna 207 aircraft models\n- Must be completed within **100 hours of flying time** after 31 October 1979\n\n**Why it matters:**\n- Fuel vapour problems can cause **engine power interruptions** in flight — obviously dangerous\n- The manufacturer (Cessna) identified this risk and created a fix\n- This directive makes that fix **legally mandatory** in Australia, not just recommended\n\n**Key point:** This is a **retroactive safety fix** — it applies to planes already built and flying, not just new ones."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD's scope is limited to Cessna 207 aircraft with serial numbers 20700001 to 20700530 and requires compliance with a specified manufacturer service instruction within a fixed timeframe. There is no textual indication within this instrument that the scope (who is affected or what action is required) has been expanded or narrowed from its stated purpose; the AD consistently ties applicability, required action, and compliance timing to those serial numbers and the named service instruction (Applicability; Requirement; Compliance; Background)."},"complexity_factors":["Narrow applicability (specific model and serial number range).","Single, specified remedial action (install placard and follow a named SIL).","Fixed, short compliance window tied to flight hours (100 hours after a date).","Dependency on an external manufacturer document (SIL No SE79-25, Supplement No 1) for procedural detail.","Cross-reference to an external regulator’s AD (FAA AD) for related context.","Limited regulatory discretion in the AD text itself—action is prescriptive rather than standards-based."],"plain_english_summary":"This AD requires owners/operators of Cessna 207 (s/n 20700001–20700530) to install a fuel‑flow stabilisation placard and follow Cessna’s Service Instruction Letter procedures to recognise/eliminate excessive fuel vapour and to restart the engine after inflight power interruptions. Compliance is mandatory within 100 flight hours after 31 Oct 1979; implementation costs and method rely on the manufacturer’s SIL and are borne by operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-207-20-fuel-flow-stabilisation-placard","history":"/api/acts/ad-cessna-207-20-fuel-flow-stabilisation-placard/history","analysis":"/api/acts/ad-cessna-207-20-fuel-flow-stabilisation-placard/analysis","conflicts":"/api/acts/ad-cessna-207-20-fuel-flow-stabilisation-placard/conflicts","importantCases":"/api/acts/ad-cessna-207-20-fuel-flow-stabilisation-placard/important-cases","documents":"/api/acts/ad-cessna-207-20-fuel-flow-stabilisation-placard/documents"}}