{"id":"F2006B08106","name":"AD/CESSNA 210/57 - Fuel Selector Valve Safety Wire - Installation","slug":"ad-cessna-210-57-fuel-selector-valve-safety-wire-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115216,"registerId":"commonwealth-F2006B08106-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 210/57 - Fuel Selector Valve Safety Wire - Installation","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 210 Series Aeroplanes\n\n \n\nAD/CESSNA 210/57 Fuel Selector Valve Safety Wire - Installation\n\n\n5/85\n\n \n\nApplicability: Model 210 with S/Nos. 21058819 to 21064535, T210-0198 to T210-0454 and P21000001 to P21000760.\n\n \n\nRequirement: Cessna SIL SE84-5.\n\n \n\nNote: FAA AD85-02-07 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","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument, as presented, imposes a specific mechanical modification (safety wire on the fuel selector roll pin) for a defined set of serial-numbered Cessna 210 aeroplanes and specifies the compliance mechanism (follow Cessna SIL SE84-5) and deadline (prior to the next Maintenance Release after 31 May 1985). Nothing in the text indicates an expansion or narrowing of that scope from its stated purpose; therefore the scope has not changed from the directive's stated intent."},"complexity_factors":["Single, well-defined engineering action: install safety wire on a specific roll pin (Background; Requirement).","Narrow applicability limited to specific serial-number ranges (Applicability).","Fixed compliance timing tied to the next Maintenance Release after a specific date (Compliance).","Requires following an external service instruction (Cessna SIL SE84-5), creating a dependency on that document for procedural detail (Requirement).","Cross-reference to an FAA AD as background material but no additional procedural complexity in the text (Note)."],"plain_english_summary":"What the rule changes mechanically\n\n- The directive requires fitting a safety wire to the roll pin that links the fuel selector rotor shaft to its yoke assembly on affected Cessna 210 aeroplanes. The safety wire physically secures the roll pin so it cannot migrate out of position (Background).\n\nWho it applies to and who decides\n\n- It applies to Cessna 210 series aeroplanes with serial numbers 21058819 to 21064535, T210-0198 to T210-0454 and P21000001 to P21000760 (Applicability).\n- The Civil Aviation Safety Authority issued the directive and sets the compliance deadline; the mandated method of compliance is to follow Cessna Service Instruction Letter SE84-5 (Requirement). The directive also records a related FAA airworthiness directive (FAA AD85-02-07) as a reference (Note).\n\nWhen it must be done\n\n- The safety-wire installation must be completed prior to the issue of the next Maintenance Release after 31 May 1985 (Compliance).\n\nWhy the change is required (stated purpose) and how that creates incentives and costs\n\n- Stated purpose: Cessna and the regulator identify a hazard where the roll pin can migrate, causing loss of fuel selector control and possible engine fuel starvation; the safety wire is intended to provide ‘‘positive retention’’ of the pin to prevent that failure mode (Background).\n- Who pays: aircraft owners/operators of the listed serial-numbered aeroplanes will bear the direct cost of carrying out the SIL SE84-5 modification (Requirement; Applicability). These costs are the materials (safety wire and any minor fittings) and labour to perform the installation.\n- Incentives and trade-offs: The directive creates a direct incentive for owners/operators to perform the maintenance at or before their next Maintenance Release to retain legal airworthiness. The trade-off is time and money spent on the modification at the mandated maintenance event rather than on other maintenance or operational needs (Compliance).\n\nCompliance burden, implementation risk and discretion\n\n- Compliance burden: The action is a single, defined maintenance task referenced to an industry service instruction (Cessna SIL SE84-5). That concentrates the burden into a one-off retrofit for the affected serial-number subset (Requirement; Applicability).\n- Implementation risk: Correct installation depends on following the specified service instruction; improper or incomplete fitting could fail to mitigate the identified hazard. The directive does not provide alternative methods of compliance in the text; compliance is by the cited SIL (Requirement).\n- Bureaucratic discretion and enforcement: The directive imposes a compliance deadline enforced through the regulatory maintenance-release process; the text does not set out a discretionary variance process in this extract (Compliance).\n\nEffects on private choices, markets and substitution\n\n- Private operational choice is constrained in the sense that affected aircraft must have the specified modification completed by the compliance date to meet the airworthiness requirement. Owners can choose timing (up to the Maintenance Release deadline) and the maintenance provider, subject to properly following the cited SIL (Compliance; Requirement).\n- Substitution effects: The directive prescribes a particular physical mitigation (safety wire on the roll pin). The text does not describe alternative mitigations, so substituting a different fix would require following another approved method or regulatory approval (Requirement).\n\nConcentrated benefits and diffuse costs\n\n- Concentrated benefits accrue to operators of the specific serial-numbered Cessna 210s (direct reduction of a particular mechanical failure risk). Costs are borne by those same operators and are likely spread across numerous operators rather than the regulator (Applicability; Requirement).\n\nReference notes\n\n- The directive cites Cessna SIL SE84-5 as the required action (Requirement) and notes FAA AD85-02-07 for related reference (Note). The safety rationale is described in the Background section."},"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 specific aircraft model range. The scope remains precisely limited to the fuel selector valve modification as originally intended."},"complexity_factors":["Single, specific mechanical requirement (install safety wire)","Only one defined applicability criterion (serial number ranges)","No nested exceptions or conditional logic","References external document (Cessna SIL SE84-5) but does not incorporate complex cross-referencing","Extremely short — approximately 150 words of substantive content","Clear, unambiguous compliance deadline"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order for aircraft owners and operators. It applies to specific **Cessna 210 series aeroplanes** (a single-engine, high-performance aircraft) built within certain serial number ranges.\n\n**What it requires:**\nOwners must install a **safety wire** on the fuel selector valve's roll pin. This is a thin metal wire that physically locks a component in place to prevent it from moving or falling out.\n\n**Why it matters:**\nWithout this fix, the roll pin connecting the fuel selector to its control mechanism could work loose. If that happens, the pilot could lose control of which fuel tank is feeding the engine, potentially causing **engine fuel starvation** — meaning the engine cuts out mid-flight due to lack of fuel, even when fuel is available in other tanks.\n\n**Who must comply:**\nAnyone operating the affected Cessna 210 models must have this modification done **before the aircraft's next scheduled maintenance check after 31 May 1985**.\n\n**Key point:** This isn't optional. Airworthiness Directives are legally binding safety requirements. Non-compliance means the aircraft cannot be legally flown."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-210-57-fuel-selector-valve-safety-wire-installation","history":"/api/acts/ad-cessna-210-57-fuel-selector-valve-safety-wire-installation/history","analysis":"/api/acts/ad-cessna-210-57-fuel-selector-valve-safety-wire-installation/analysis","conflicts":"/api/acts/ad-cessna-210-57-fuel-selector-valve-safety-wire-installation/conflicts","importantCases":"/api/acts/ad-cessna-210-57-fuel-selector-valve-safety-wire-installation/important-cases","documents":"/api/acts/ad-cessna-210-57-fuel-selector-valve-safety-wire-installation/documents"}}