{"id":"F2006B02407","name":"AD/ANSON/10 - Fuel Crossfeed Cock - Inspection","slug":"ad-anson-10-fuel-crossfeed-cock-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41650,"registerId":"commonwealth-F2006B02407-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/ANSON/10 - Fuel Crossfeed Cock - Inspection","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)  Avro Anson and Avro 19 Series Aeroplanes\n\n \n\nAD/ANSON/10 Fuel Crossfeed Cock - Inspection 3/52\n\nApplicability: Anson.\n\n \n\nRequirement: Inspect the fuel crossfeed cock and ensure that the stop ring is NOT in a position which will prevent the cock from being moved to the ‘OFF’ position; or\n\n \n\nANO 105.1.31.4.6.2.\n\n \n\nCompliance: At any time the fuel crossfeed cock is disturbed.\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\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 for a specific vintage aircraft type (Avro Anson, a WWII-era twin-engine aircraft). It has not expanded beyond its original narrow purpose of addressing a specific mechanical defect in the fuel system. The scope remains tightly confined to the original safety concern."},"complexity_factors":["Extremely short document (under 150 words)","Only 1 defined term implicitly referenced ('Anson' — referring to Avro Anson aircraft series)","Single, straightforward mechanical inspection requirement","No cross-references to other legislation beyond a cryptic internal reference 'ANO 105.1.31.4.6.2' (likely an old Air Navigation Order)","No conditional logic or exceptions — simple binary compliance trigger (when disturbed, inspect)","Minimal regulatory machinery — essentially a one-line safety instruction with applicability and timing"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:**\nThis directive requires owners and operators of **Avro Anson aircraft** to inspect a specific fuel system component called the \"fuel crossfeed cock\" (a valve that allows fuel to flow between different tanks). The inspection must verify that a \"stop ring\" (a mechanical limiting device) is **not** positioned in a way that would prevent the valve from being turned completely to the 'OFF' position.\n\n**Why it matters:**\nIf the stop ring blocks the valve from fully closing, fuel could leak or flow uncontrollably between tanks. This creates a fire hazard and could lead to fuel starvation or imbalance — both serious flight safety risks.\n\n**Who must comply:**\nAnyone operating or maintaining an Avro Anson aircraft.\n\n**When to do it:**\nEvery time the fuel crossfeed cock is disturbed (opened, adjusted, or worked on)."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument sets a specific inspection requirement for Avro Anson aircraft and does not indicate any change from a prior broader or narrower scope. The directive itself contains a single, narrowly framed obligation (Requirement) with an event-driven compliance trigger (Compliance) and makes no explicit statement that it alters the scope of prior obligations."},"complexity_factors":["Very short directive with a single clear technical requirement (inspect stop ring position)","Narrow applicability limited to Anson aircraft (Applicability)","Compliance trigger is event-driven ('disturbed') but the term is undefined, creating interpretive discretion (Compliance)","Cross-reference to ANO 105.1.31.4.6.2 introduces external dependency for alternative compliance (Requirement)","No procedural details (who inspects, how, records, remediation), increasing implementation uncertainty despite low substantive content"],"plain_english_summary":"This airworthiness directive requires operators/maintainers of Avro Anson aeroplanes to inspect the fuel crossfeed cock whenever it is \"disturbed\" to confirm the stop ring does not prevent moving the cock to OFF (or follow ANO 105.1.31.4.6.2). It aims to ensure the valve can be secured OFF when needed, but is sparse on procedure, responsibility, cost allocation, definition of \"disturbed,\" record‑keeping and remediation, leaving implementation discretion to operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-anson-10-fuel-crossfeed-cock-inspection","history":"/api/acts/ad-anson-10-fuel-crossfeed-cock-inspection/history","analysis":"/api/acts/ad-anson-10-fuel-crossfeed-cock-inspection/analysis","conflicts":"/api/acts/ad-anson-10-fuel-crossfeed-cock-inspection/conflicts","importantCases":"/api/acts/ad-anson-10-fuel-crossfeed-cock-inspection/important-cases","documents":"/api/acts/ad-anson-10-fuel-crossfeed-cock-inspection/documents"}}