{"id":"F2006B04592","name":"AD/BELL 212/6 - Main Rotor Blade - Removal From Service","slug":"ad-bell-212-6-main-rotor-blade-removal-from-service","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44332,"registerId":"commonwealth-F2006B04592-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 212/6 - Main Rotor Blade - Removal From Service","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 212 Series Helicopters\n\n \n\nAD/BELL 212/6 Main Rotor Blade - Removal From Service 2/76\n\nApplicability: All models.\n\n \n\nRequirement: Remove from service main rotor blades having the following S/Nos.: A2-03642, A2-3643, A2-03646, A2-27872, A2-27961, A2-27963, A2-27967 A2-27968,\n\nA2-27982, A2-28015, A2-28016, A2-28019, A2-28020, A2-28023, A2-28195, A2-28198, A2-28211, A2-29315, A2-29325, A2-29334, A2-29915, A2-29919 and A2-29920.\n\n \n\nCompliance: Before further flight after 16 January 1976.\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 sets its scope explicitly: it applies to Bell 212 series helicopters (All models) but is limited to the specific main rotor blade serial numbers listed. The text contains no language that indicates an alteration or expansion of scope from an earlier or original version; no amendment or repeal language is present in the supplied text. (Applicability; Requirement)"},"complexity_factors":["Narrow, specific scope defined by a finite list of serial numbers reduces legal and operational ambiguity (Requirement).","Clear, single mandatory action (remove from service) with a fixed deadline simplifies compliance steps (Requirement; Compliance).","Applies to all Bell 212 models but only to identified blades, requiring fleet-wide serial-number checks (Applicability; Requirement).","No alternative compliance paths, repair instructions or deferment conditions are provided, increasing operational impact but simplifying legal interpretation (Requirement).","Implementation depends on accurate identification and inventory control of rotor blade serial numbers—an administrative burden for operators and maintenance providers (Requirement).","Enforcement rests with CASA under the cited Civil Aviation Regulations; the directive itself contains no internal appeal or discretion clauses (Header)."],"plain_english_summary":"This CASA Airworthiness Directive requires owners and operators of Bell 212 helicopters to remove from service specific main rotor blades identified by serial number. Affected blades must be taken off before the helicopter’s next flight after 16 January 1976. The rule creates an immediate maintenance and administrative burden—operators bear removal and replacement costs and maintenance teams must verify serial numbers to ensure compliance."},"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive from 1976. It has not evolved beyond its original purpose of grounding specific defective rotor blades. The scope remains exactly as intended: immediate removal of identified unsafe components."},"complexity_factors":["Single, unambiguous requirement with no conditional logic","No defined terms requiring interpretation","No cross-references to other legislation or regulations","Simple list of 24 serial numbers — no ranges or patterns requiring parsing","Absolute compliance deadline with no exceptions or alternative methods","Total length: approximately 150 words"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a safety order issued by Australia's Civil Aviation Safety Authority (CASA) telling helicopter operators to ground specific equipment immediately.\n\n**What it does:** It orders the immediate removal from service of 24 specific main rotor blades on Bell 212 series helicopters. These blades are identified by their serial numbers (S/Nos.).\n\n**Who it affects:** Anyone operating Bell 212 series helicopters in Australia — this includes commercial operators, emergency services, and private owners.\n\n**Why it matters:** Main rotor blades are critical safety components. If one fails in flight, the helicopter crashes. This AD suggests CASA identified a defect or safety risk with these specific blades that made them unsafe to fly. The \"before further flight\" compliance deadline means operators had to ground affected helicopters immediately — no grace period.\n\n**Key details:**\n- **Applies to:** All Bell 212 models\n- **Affected blades:** 24 specific serial numbers listed (ranging from A2-03642 to A2-29920)\n- **Deadline:** Before any further flight after 16 January 1976\n- **Action required:** Remove the listed blades from service (replace or retire them)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-212-6-main-rotor-blade-removal-from-service","history":"/api/acts/ad-bell-212-6-main-rotor-blade-removal-from-service/history","analysis":"/api/acts/ad-bell-212-6-main-rotor-blade-removal-from-service/analysis","conflicts":"/api/acts/ad-bell-212-6-main-rotor-blade-removal-from-service/conflicts","importantCases":"/api/acts/ad-bell-212-6-main-rotor-blade-removal-from-service/important-cases","documents":"/api/acts/ad-bell-212-6-main-rotor-blade-removal-from-service/documents"}}