{"id":"F2006B04532","name":"AD/BELL 206/80 - Fuel Feed Tube and Vent Tube - Replacement","slug":"ad-bell-206-80-fuel-feed-tube-and-vent-tube-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114248,"registerId":"commonwealth-F2006B04532-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 206/80 - Fuel Feed Tube and Vent Tube - Replacement","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\nBell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters\n\n \n\nAD/BELL 206/80 Fuel Feed Tube and Vent Tube - Replacement 1/80\n\nApplicability: All models 206L and 206L-1. Document:  Bell Alert SB No. 206L-79-7.\n\nCompliance: Within 100 hours time in service after 31 January 1980.\n\n \n\nBackground:  Moisture accumulation in the insulating material adjacent to the fuel feed tube and a fuel vent tube can cause corrosion to the extent of the tube wall penetration.\n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive issued in 1980. It addresses a specific mechanical defect in specific helicopter models. There is no indication of scope creep; it does exactly what it says on the tin — mandates tube replacement to address a known corrosion risk."},"complexity_factors":["Very short document (under 200 words)","Only 2 defined applicability criteria (model numbers)","Single compliance requirement with clear deadline","No cross-references to other legislation beyond the parent Civil Aviation Regulations","No conditional logic or exceptions","Straightforward factual background with single causal chain (moisture → corrosion → tube wall penetration)"],"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 helicopters.\n\n**What it does:**\nOrders owners and operators of **Bell 206L and 206L-1 helicopters** to replace certain fuel tubes (the fuel feed tube and vent tube) to prevent dangerous corrosion.\n\n**Why it matters:**\nMoisture can build up in insulation around these tubes, causing them to corrode so badly that the tube walls develop holes. This creates a serious fire and fuel leak risk.\n\n**Who must comply:**\nAnyone operating these specific helicopter models in Australia.\n\n**Deadline:**\nThe replacement must be done within **100 hours of flight time** after 31 January 1980.\n\n**Source:**\nBased on a manufacturer safety bulletin (Bell Alert Service Bulletin 206L-79-7)."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument specifies a limited, explicit scope: all Bell 206L and 206L-1 helicopters. It prescribes a single corrective action (replacement of the fuel feed and vent tubes) to be completed within a defined flight-hours window and references a specific Bell Alert Service Bulletin for implementation. The source text does not indicate any expansion or narrowing of that original applicability or obligation."},"complexity_factors":["Narrow applicability (only Bell 206L and 206L-1): reduces breadth but concentrates impact on a defined operator group. (Applicability)","Single, prescriptive maintenance action (replacement of two tubes) with a fixed compliance window: straightforward technical instruction but operationally binding. (Compliance)","Mandatory compliance tied to flight-hours (100 hours after a fixed date): requires tracking hours-in-service to determine the deadline. (Compliance)","Dependence on an external technical document (Bell Alert SB No. 206L-79-7) for implementation details: adds reliance on another source for procedural specifics. (Document)","Safety-critical context (fuel lines and corrosion risk): work must meet aviation maintenance standards and influence downtime and parts sourcing. (Background)","Regulatory framing under Civil Aviation Regulations Part 39 and the Schedule of Airworthiness Directives: gives the measure legal force and administrative provenance. (header)"],"plain_english_summary":"Owners/operators of Bell 206L and 206L‑1 helicopters must replace the fuel feed tube and a fuel vent tube per Bell Alert Service Bulletin No. 206L‑79‑7 within 100 flight hours after 31 January 1980. The action responds to moisture‑induced corrosion in insulating material that can penetrate tube walls. Compliance imposes a one‑off maintenance cost, scheduling and downtime burden on affected operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-80-fuel-feed-tube-and-vent-tube-replacement","history":"/api/acts/ad-bell-206-80-fuel-feed-tube-and-vent-tube-replacement/history","analysis":"/api/acts/ad-bell-206-80-fuel-feed-tube-and-vent-tube-replacement/analysis","conflicts":"/api/acts/ad-bell-206-80-fuel-feed-tube-and-vent-tube-replacement/conflicts","importantCases":"/api/acts/ad-bell-206-80-fuel-feed-tube-and-vent-tube-replacement/important-cases","documents":"/api/acts/ad-bell-206-80-fuel-feed-tube-and-vent-tube-replacement/documents"}}