{"id":"F2006B04668","name":"AD/BELL 412/34 - Swashplate Support","slug":"ad-bell-412-34-swashplate-support","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44420,"registerId":"commonwealth-F2006B04668-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 412/34 - Swashplate Support","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBell Helicopter Textron 412 Series Helicopters\n\nAD/BELL 412/34 Swashplate Support 5/95 DM\n\nApplicability: All Bell model 412 series helicopters, S/N 33001 to 33159 and S/N 34001 to 34024, fitted with swashplate support P/N 412-010-409-105 or 412-010-443-101.\n\nRequirement: 1. Perform a close detailed visual inspection of the Swashplate Support.\n\nInspect in accordance with Bell Alert Service Bulletin (ASB) 412-93-71, Accomplishment Instructions Part I.\n\n2. Remove installed Swashplate Support (P/N 412-010-409-105 or 412-012-443-101) and replace with new P/N 412-010-453-105.\n\nRemove and replace in accordance with Bell ASB 412-93-71, Accomplishment Instructions Part II.\n\nCompliance: 1\\. Inspect in accordance with Requirement 1 before further flight after 22 March 1995. Reinspect at each 25 hour inspection until replaced in accordance with Requirement 2.\n\n2. Remove and replace in accordance with Requirement 2 within 400 hours time in service after 27 April 1995 or before 31 December 1995 whichever is the later.\n\nBackground: A report has been received of a fatigue failure of a swashplate P/N 412-010-409-105.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive narrowly targets remediation for a reported fatigue failure by requiring inspection and replacement of specific swashplate supports on listed serial-numbered Bell 412 helicopters; it does not expand applicability beyond the named helicopters or parts (Applicability; Requirement; Background)."},"complexity_factors":["Narrow technical applicability: applies only to Bell 412 helicopters with listed serial numbers and specific swashplate support P/Ns (Applicability).","Two-stage compliance: recurrent close visual inspections until a mandatory part replacement is completed (Requirement 1 & Requirement 2).","Concrete timing constraints: inspection-before-flight mandate and replacement within a specified flight-hours or date deadline (Compliance).","Procedure dependence: inspection and replacement must follow Bell Alert Service Bulletin 412-93-71 (Requirement).","Operational impact: scheduling inspections and sourcing the replacement P/N may affect aircraft availability (Requirement & Compliance).","Regulatory enforcement: issued as a CASA airworthiness directive, making compliance mandatory (Header/Schedule of Airworthiness Directives)."],"plain_english_summary":"**What it does:** This airworthiness directive requires operators of certain Bell 412 helicopters fitted with specified swashplate support part numbers to carry out close visual inspections and then replace the identified part with a new part number.\n\nIt addresses a reported fatigue failure; inspections must be done before further flight and repeated until the mandatory replacement is completed within the specified flight‑hour/date limits, enforced under the Civil Aviation Safety Authority."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive addressing a specific mechanical defect in specific aircraft. It has not expanded beyond its original purpose of mandating inspection and replacement of a faulty helicopter component."},"complexity_factors":["Single, specific mechanical issue addressed","Only 2 defined part numbers in applicability","Clear two-step compliance structure (inspect, then replace)","Simple date/hour-based deadlines with straightforward 'whichever is later' logic","No cross-references to other legislation beyond the parent Civil Aviation Regulations","Background section provides single-sentence rationale","Total length: approximately 200 words"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspection and replacement of a potentially fatigue-prone swashplate support on certain Bell 412 helicopters to prevent main-rotor control failure and catastrophic loss of control.  \n\nIt affects owners/operators of Bell 412s in the specified serial-number range fitted with the named swashplate support part numbers."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-412-34-swashplate-support","history":"/api/acts/ad-bell-412-34-swashplate-support/history","analysis":"/api/acts/ad-bell-412-34-swashplate-support/analysis","conflicts":"/api/acts/ad-bell-412-34-swashplate-support/conflicts","importantCases":"/api/acts/ad-bell-412-34-swashplate-support/important-cases","documents":"/api/acts/ad-bell-412-34-swashplate-support/documents"}}