{"id":"F2006B04478","name":"AD/BELL 206/22 - Hydraulic Actuator - Replacement","slug":"ad-bell-206-22-hydraulic-actuator-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44315,"registerId":"commonwealth-F2006B04478-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 206/22 - Hydraulic Actuator - 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\n![](image.001.png)  Bell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters\n\n \n\nAD/BELL 206/22 Hydraulic Actuator - Replacement 12/69\n\nApplicability: All model 206A and AB-206A. Document:  Bell SB No. 206A-12.\n\nNote: Agusta SB No. BT206-35 refers.\n\n \n\nCompliance: 1. For actuators with 850 hours or more total time in service at 17 November 1969 - within the next 25 hours time in service.\n\n \n\n2. For actuators with less than 850 hours total time in service - before exceeding 875 hours total time in service.\n\n \n\nBackground: AD/Agusta 206/15 equivalent.\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-limited safety directive from 1969 addressing a specific mechanical defect in specific helicopter models. It has not expanded beyond its original narrow scope of hydraulic actuator replacement."},"complexity_factors":["Extremely short document (under 200 words)","Only 2 conditional compliance paths based on flight hours","No defined terms section — uses plain operational language ('time in service', 'total time')","Minimal cross-referencing (only 2 service bulletins and 1 equivalent AD mentioned)","Single mechanical action required (replacement of one component)","No nested exceptions or sub-delegations"],"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 certain Bell and Agusta-Bell 206 series helicopters to **replace a hydraulic actuator** (a mechanical device that helps control the aircraft) by a specific deadline to prevent potential failures.\n\n**Who it affects:**\n- All **Bell 206A** and **Agusta-Bell AB-206A** helicopter models\n- Anyone who owns, operates, or maintains these aircraft in Australia\n\n**The deadlines:**\n- If your actuator has **850+ hours** of flight time as of 17 November 1969: replace it **within the next 25 flight hours**\n- If your actuator has **less than 850 hours**: replace it **before it reaches 875 total flight hours**\n\n**Why it matters:**\nHydraulic actuators are critical for flight control. This directive prevents catastrophic failure by forcing replacement of parts that have reached a known wear threshold. The reference to an equivalent Agusta directive suggests this addresses a known safety defect across similar aircraft types.\n\n**Key documents referenced:**\n- Bell Service Bulletin 206A-12 (the manufacturer's official repair notice)\n- Agusta Service Bulletin BT206-35 (related guidance for the Italian-licensed version)"},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive’s scope is confined to the specified models and to actuators meeting the stated total‑time thresholds as at 17 November 1969, with replacement deadlines set in the two compliance clauses. There is no text in this instrument that expands or narrows scope beyond those stated model and time‑in‑service criteria (Applicability; Compliance 1–2)."},"complexity_factors":["Narrow applicability limited to two specific helicopter models (Applicability).","Two straightforward, time‑based compliance thresholds tied to recorded total time in service (Compliance 1–2).","Short compliance window for high‑hour actuators (25 hours) increases scheduling pressure (Compliance 1).","Technical method delegated to an external document (Bell SB No. 206A‑12), creating reliance on that service bulletin for procedural detail (Applicability: Document).","No procedural detail in the AD about who performs the work, cost allocation, or enforcement in the instrument text, requiring operators to seek those details elsewhere (Applicability; Compliance 1–2)."],"plain_english_summary":"The AD requires replacement of the hydraulic actuator on Bell 206A and Agusta AB‑206A helicopters by firm total-time thresholds; owners/operators must determine each actuator’s hours as of 17 November 1969 and replace it per Bell Service Bulletin No. 206A‑12 within the stated limits (25 hours if ≥850 hours then, otherwise before 875 hours). It aligns with AD/Agusta 206/15."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-22-hydraulic-actuator-replacement","history":"/api/acts/ad-bell-206-22-hydraulic-actuator-replacement/history","analysis":"/api/acts/ad-bell-206-22-hydraulic-actuator-replacement/analysis","conflicts":"/api/acts/ad-bell-206-22-hydraulic-actuator-replacement/conflicts","importantCases":"/api/acts/ad-bell-206-22-hydraulic-actuator-replacement/important-cases","documents":"/api/acts/ad-bell-206-22-hydraulic-actuator-replacement/documents"}}