{"id":"F2006B05287","name":"AD/CESSNA 207/28 - Fuel Selector Valve Safety Wire","slug":"ad-cessna-207-28-fuel-selector-valve-safety-wire","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45688,"registerId":"commonwealth-F2006B05287-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 207/28 - 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 207 Series Aeroplanes\n\n \n\nAD/CESSNA 207/28 Fuel Selector Valve Safety Wire 5/85\n\nApplicability: Model 207 with S/Nos. 20700001 to 20700773. 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":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive applies to the serial-numbered subset of Cessna 207 aircraft and mandates installation of safety wire per the manufacturer's service instruction by the specified compliance point. The text does not indicate any expansion or narrowing of that applicability beyond the listed serial numbers or any amendment to the required action; therefore the scope as stated aligns with the original technical corrective intent in this instrument (Applicability; Requirement; Compliance)."},"complexity_factors":["Narrow applicability: specific serial-number range reduces scope complexity (Applicability).","Single, discrete technical action referenced to an external manufacturer instruction (Cessna SIL SE84-5) rather than multiple procedural options (Requirement).","Fixed compliance deadline tied to the next Maintenance Release after a specific date (Compliance) which simplifies scheduling rules but requires administrative tracking.","Dependence on an external document (Cessna SIL SE84-5) creates a reliance on that document's clarity and availability.","Regulatory cross-reference to FAA AD adds a second authoritative source to consult (Note)."],"plain_english_summary":"Requires fitting safety wire to the roll pin linking the fuel‑selector rotor shaft to its yoke on Cessna 207 aircraft (serials 20700001–20700773), installed per Cessna SIL SE84‑5 before the next Maintenance Release after 31 May 1985.  \n\nThe action prevents roll‑pin migration that can cause fuel‑selector loss and engine fuel starvation; owners/operators fund the one‑off work and the authorised maintenance organisation signs off compliance."},"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 a defined aircraft population. It has not expanded beyond its original purpose of mandating a single physical modification to prevent fuel starvation incidents."},"complexity_factors":["Extremely short document (approximately 150 words of substantive content)","Only 2 defined applicability criteria (model and serial number range)","Single mechanical action required (install safety wire per referenced document)","No nested exceptions, conditional logic, or cross-references to other legislation beyond one Cessna service letter and one FAA directive reference","Clear, unambiguous compliance deadline tied to a specific date and maintenance event","No interpretive provisions, penalty clauses, or administrative procedures included"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\nRequires owners/operators of certain Cessna 207 aeroplanes to install a **safety wire** on the fuel selector valve. This is a thin metal wire that physically locks a small metal pin (called a \"roll pin\") in place.\n\n**Why it matters:**\nThe roll pin connects the fuel selector control to the valve mechanism. If this pin works loose or falls out, the pilot could lose control of which fuel tank is feeding the engine. This can cause **engine fuel starvation** — the engine cuts out because it's not getting fuel — which is obviously extremely dangerous when flying.\n\n**Who it affects:**\n- **Aircraft:** Cessna Model 207 aeroplanes with serial numbers 20700001 through 20700773\n- **People:** Owners, operators, and maintenance engineers responsible for these specific aircraft\n\n**What must be done:**\nThe safety wire must be installed following the instructions in **Cessna Service Information Letter SE84-5** before the aircraft's next **Maintenance Release** (a formal document certifying an aircraft is airworthy) is issued after 31 May 1985.\n\n**Key point:** This is a **retrospective safety fix** — it applies to aircraft already in service, not just new ones. The reference to \"FAA AD 85-02-07\" shows this aligns with an equivalent American safety order, indicating this was a known international safety issue."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-207-28-fuel-selector-valve-safety-wire","history":"/api/acts/ad-cessna-207-28-fuel-selector-valve-safety-wire/history","analysis":"/api/acts/ad-cessna-207-28-fuel-selector-valve-safety-wire/analysis","conflicts":"/api/acts/ad-cessna-207-28-fuel-selector-valve-safety-wire/conflicts","importantCases":"/api/acts/ad-cessna-207-28-fuel-selector-valve-safety-wire/important-cases","documents":"/api/acts/ad-cessna-207-28-fuel-selector-valve-safety-wire/documents"}}