{"id":"F2006B04534","name":"AD/BELL 206/82 - Centre Post Installation - Structural Attachment - Inspection and Modification","slug":"ad-bell-206-82-centre-post-installation-structural-attachment-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114250,"registerId":"commonwealth-F2006B04534-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 206/82 - Centre Post Installation - Structural Attachment - Inspection and Modification","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 206/82 Centre Post Installation - Structural\n\nAttachment - Inspection and Modification\n\n\n2/80\n\n \n\nApplicability: All model 206L with S/Nos. 45004 to 45153 and 46601 to 46617. All model 206L-1 with S/Nos. 45154 to 45299.\n\n \n\nDocument: Bell Technical Bulletin No. 206L-79-41. Compliance: As per the requirement document.\n\nBackground: The manufacturer has advised that cracks have been found during periodic inspections of the centre post structural attachment area.\n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"Based solely on the text provided, the AD applies to the specific serial-number ranges listed (Applicability) and requires compliance with Bell Technical Bulletin No. 206L-79-41 (Document; Compliance). The instrument does not indicate a change in scope from an earlier version; it simply specifies which airframes are affected and directs compliance to the referenced requirement document. There is no statement in the text that the applicability or scope has been expanded or reduced relative to an earlier instrument."},"complexity_factors":["Reference to an external technical document (Bell Technical Bulletin No. 206L-79-41) for all procedural detail increases complexity because the AD does not itself set inspection intervals or repair steps (Document; Compliance).","Limited, serial-numbered applicability requires operators to compare fleet serial numbers against the listed ranges to determine who is affected (Applicability).","Technical nature of the required inspections/modifications requires certified maintenance personnel and possibly specialised parts or tooling, which adds operational complexity (implied by inspection/modification requirement in Document).","Enforcement and compliance depend on CASA’s directive mechanism and industry adherence to the referenced bulletin rather than on explicit steps in the AD text (Schedule of Airworthiness Directives header; Document).","Ambiguity in the AD text about timing and extent ('As per the requirement document') shifts complexity to interpreting and obtaining the requirement document (Compliance)."],"plain_english_summary":"CASA has issued an airworthiness directive requiring inspection—and corrective modification if needed—of the centre-post structural attachment area on specified Bell 206L/206L‑1 helicopters, by following Bell Technical Bulletin No. 206L‑79‑41.  \n\nThe AD affects owners/operators (who bear inspection and repair costs and downtime), was prompted by manufacturer reports of cracks, and enforces compliance by reference to the technical bulletin."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific airworthiness concern. It has not expanded beyond its original purpose of mandating inspection and modification for a defined fleet subset."},"complexity_factors":["Very short document (approximately 150 words)","Only 2 defined applicability criteria (serial number ranges)","Single cross-reference to manufacturer technical bulletin","No conditional logic or nested exceptions","Straightforward compliance requirement ('as per the requirement document')","No interpretative provisions or definitions section"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires specific inspections and modifications to certain Bell 206 helicopters.\n\n**What it does:**\n- Orders owners and operators of particular Bell 206L and 206L-1 helicopters to inspect and modify the \"centre post\" — a structural component that helps hold the helicopter together.\n- The directive references a manufacturer bulletin (Bell Technical Bulletin 206L-79-41) that contains the detailed instructions.\n\n**Who it affects:**\n- Owners and operators of Bell 206L helicopters with serial numbers 45004–45153 and 46601–46617\n- Owners and operators of Bell 206L-1 helicopters with serial numbers 45154–45299\n\n**Why it matters:**\n- Cracks have been discovered in this structural area during routine checks. If left unaddressed, this could lead to structural failure — potentially catastrophic in a helicopter.\n- Compliance is mandatory. Operators must follow the manufacturer's bulletin to keep their aircraft airworthy (legally safe to fly)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-82-centre-post-installation-structural-attachment-inspection-and-modification","history":"/api/acts/ad-bell-206-82-centre-post-installation-structural-attachment-inspection-and-modification/history","analysis":"/api/acts/ad-bell-206-82-centre-post-installation-structural-attachment-inspection-and-modification/analysis","conflicts":"/api/acts/ad-bell-206-82-centre-post-installation-structural-attachment-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-bell-206-82-centre-post-installation-structural-attachment-inspection-and-modification/important-cases","documents":"/api/acts/ad-bell-206-82-centre-post-installation-structural-attachment-inspection-and-modification/documents"}}