{"id":"F2006B05245","name":"AD/CESSNA 206/40 - Fuel Selector Valve Safety Wire","slug":"ad-cessna-206-40-fuel-selector-valve-safety-wire","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45557,"registerId":"commonwealth-F2006B05245-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 206/40 - Fuel Selector Valve Safety Wire","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 206 Series Aeroplanes\n\n \n\nAD/CESSNA 206/40 Fuel Selector Valve Safety Wire 5/85\n\nApplicability: Model 206 with S/Nos. 206-0001 to U20606827 and P206-0001 to P20600647. Requirement:               Action in accordance with Cessna SIL SE84-5.\n\nNote: FAA AD 85-02-07 refers.\n\n \n\nCompliance: Prior to issue of the next Maintenance Release after 31 May 1985.\n\n \n\nBackground: Loss of fuel selector control, followed by engine fuel starvation can occur should the roll pin connecting the fuel selector rotor shaft to the yoke assembly migrate out of its location. To prevent this possibility, safety wire is fitted to the roll pin thereby ensuring positive retention.\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 safety directive addressing a specific mechanical defect in specific aircraft. It has not expanded beyond its original purpose of mandating a safety wire installation to prevent fuel selector failure."},"complexity_factors":["Extremely short document — approximately 150 words total","Only 2 defined applicability criteria (serial number ranges)","Single, unambiguous compliance requirement with clear deadline","No nested exceptions, conditional logic, or cross-references to other legislation beyond one optional note referencing FAA guidance","Plain language background explanation included","No interpretation section or defined terms"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety fix ordered by Australia's Civil Aviation Safety Authority (CASA) for specific Cessna 206 aircraft.\n\n**Who it affects:** Owners and operators of Cessna Model 206 aeroplanes with serial numbers from 206-0001 to U20606827, and P206-0001 to P20600647. These are older aircraft — roughly mid-1960s to mid-1980s vintage.\n\n**What it requires:** Before the aircraft's next Maintenance Release (a document certifying an aircraft is safe to fly) is issued after 31 May 1985, mechanics must install a safety wire on the fuel selector valve's roll pin. This involves following instructions in Cessna Service Information Letter SE84-5.\n\n**Why it matters:** The roll pin connecting the fuel selector rotor to the yoke can work its way loose. If it migrates out of position, pilots can lose control of fuel selection, potentially causing engine fuel starvation (the engine cuts out because it isn't getting fuel). The safety wire physically locks the pin in place, preventing this dangerous failure.\n\n**Key point:** This is a one-time, relatively simple mechanical modification — not a recurring inspection. It references an American FAA directive (85-02-07) for additional guidance."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument’s scope, as stated in the text, is a narrow, aircraft-specific airworthiness directive requiring installation of safety wire on the fuel selector roll pin for listed Cessna 206 serial numbers. The AD’s applicability, required action (follow Cessna SIL SE84-5), and compliance timing are set out in the text and do not indicate any change from that original stated purpose (\"Applicability\"; \"Requirement\"; \"Compliance\")."},"complexity_factors":["Narrow applicability limited to specific serial-number ranges (\"Applicability\")","Requires following an external manufacturer document (Cessna SIL SE84-5) rather than containing full technical detail (\"Requirement\")","Single, time-limited compliance deadline tied to next Maintenance Release after a fixed date (\"Compliance\")","Technical subject-matter (fuel selector roll pin and safety wiring) requires mechanical competence to implement (\"Background\"; \"Requirement\")","Reference to an external regulator’s AD (FAA) adds cross-jurisdictional linkage though no additional procedural detail is provided (\"Note\")"],"plain_english_summary":"This AD requires owners/operators of specified Cessna 206 serial numbers to fit a safety wire to the fuel-selector roll pin per Cessna Service Information Letter SE84-5, to be done by the next Maintenance Release after 31 May 1985. It aims to prevent roll‑pin migration and consequent loss of fuel-selector control, imposing a narrow, time‑bound maintenance obligation and associated labour/material costs."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-206-40-fuel-selector-valve-safety-wire","history":"/api/acts/ad-cessna-206-40-fuel-selector-valve-safety-wire/history","analysis":"/api/acts/ad-cessna-206-40-fuel-selector-valve-safety-wire/analysis","conflicts":"/api/acts/ad-cessna-206-40-fuel-selector-valve-safety-wire/conflicts","importantCases":"/api/acts/ad-cessna-206-40-fuel-selector-valve-safety-wire/important-cases","documents":"/api/acts/ad-cessna-206-40-fuel-selector-valve-safety-wire/documents"}}