{"id":"F2006B04483","name":"AD/BELL 206/27 - Voltage Regulator - Replacement","slug":"ad-bell-206-27-voltage-regulator-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44320,"registerId":"commonwealth-F2006B04483-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 206/27 - Voltage Regulator - 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 206/27 Voltage Regulator - Replacement 8/70\n\nApplicability: All models equipped with voltage regulator P/N 206-075-027-3. Document: Bell SL No. 206A-139, Rev. B.\n\nNote: Agusta SB No. BT206-44 refers.\n\n \n\nCompliance: Within 300 hours time in service after 31 August 1970. Background: AD/Agusta 206/19 equivalent.\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive from 1970 addressing a specific defective part. It has not expanded beyond its original narrow technical scope."},"complexity_factors":["Single, specific technical requirement (replace one part number)","No defined terms section or interpretation provisions","Simple compliance deadline (300 hours time in service after fixed date)","Minimal cross-referencing (only two related service documents cited)","No conditional logic, exceptions, or nested provisions","Extremely short document (approximately 100 words of substantive content)"],"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:**\nRequires owners and operators of certain Bell 206 series helicopters to replace a specific voltage regulator part (part number 206-075-027-3) to prevent electrical system failures.\n\n**Who it affects:**\n- Owners and operators of Bell Helicopter Textron Canada (BHTC) 206 helicopters\n- Owners and operators of Agusta Bell 206 series helicopters\n- Specifically those aircraft equipped with voltage regulator part number 206-075-027-3\n\n**What must be done:**\n- Replace the specified voltage regulator\n- Complete this work within 300 hours of flight time after 31 August 1970\n\n**Why it matters:**\nVoltage regulators control electrical output in aircraft. A faulty regulator can cause electrical system failures, potentially leading to loss of critical flight instruments, communications, or navigation equipment. This directive prevents that safety risk by mandating replacement of a defective part.\n\n**Key documents referenced:**\n- Bell Service Letter No. 206A-139, Revision B (the manufacturer's instructions)\n- Agusta Service Bulletin No. BT206-44 (related guidance for Agusta-built variants)"},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive applies only to helicopters fitted with the specified voltage regulator part number (P/N 206-075-027-3) and does not expand that scope beyond those aircraft. The background cites an equivalent Agusta AD, indicating the action is intended to address the same issue identified previously rather than to broaden applicability (Applicability; Background)."},"complexity_factors":["Single clear mandated action: replace a specific part (P/N 206-075-027-3) (Applicability).","Fixed compliance metric tied to flight hours (300 hours after 31 August 1970) which is easy to apply but requires accurate time-in-service records (Compliance).","Dependence on external technical documents (Bell SL No. 206A-139, Rev. B; Agusta SB No. BT206-44) creates a small administrative step to obtain and follow those instructions (Document; Note).","Enforcement and applicability rest on operators correctly identifying equipped aircraft by part number, which may require maintenance-record checks (Applicability).","No phased or conditional compliance paths provided; one definitive action and deadline reduces procedural complexity (Compliance)."],"plain_english_summary":"This AD mandates replacing voltage regulator P/N 206‑075‑027‑3 on Bell/Agusta 206‑series helicopters fitted with that part, to be done within 300 hours time‑in‑service after 31 August 1970. It affects owners/operators who must identify affected aircraft, procure and install the replacement per the referenced Bell service letter (and noted Agusta bulletin). The requirement imposes parts, labour and downtime costs and is enforced under the Civil Aviation Regulations."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-27-voltage-regulator-replacement","history":"/api/acts/ad-bell-206-27-voltage-regulator-replacement/history","analysis":"/api/acts/ad-bell-206-27-voltage-regulator-replacement/analysis","conflicts":"/api/acts/ad-bell-206-27-voltage-regulator-replacement/conflicts","importantCases":"/api/acts/ad-bell-206-27-voltage-regulator-replacement/important-cases","documents":"/api/acts/ad-bell-206-27-voltage-regulator-replacement/documents"}}