{"id":"F2006B04475","name":"AD/BELL 206/2 - Exhaust Stack Clamps - Replacement","slug":"ad-bell-206-2-exhaust-stack-clamps-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44312,"registerId":"commonwealth-F2006B04475-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 206/2 - Exhaust Stack Clamps - 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 206/2 Exhaust Stack Clamps - Replacement 3/68\n\nApplicability: All model 206A with S/Nos. 4 to 110, 112 to 116, 118, 119, 122, 124 to 126, 128,\n\n129 and 133.\n\n \n\nDocument: Bell SL 206A No. 38.\n\n \n\nCompliance: Within 25 hours time in service from 1 April 1968.\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 1968 addressing a specific mechanical defect. It has not expanded beyond its original purpose of mandating exhaust stack clamp replacement on affected helicopter models."},"complexity_factors":["Very short document (under 200 words)","Only 4 operative provisions: applicability, reference document, action required, and deadline","Single cross-reference to manufacturer service letter (Bell SL 206A No. 38)","Simple conditional logic: if your helicopter has one of these serial numbers, you must comply","No defined terms section, no nested exceptions, no subordinate legislation references"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires owners and operators of specific Bell 206A helicopters to replace their exhaust stack clamps.\n\n**Who it affects:**\n- Owners and operators of Bell 206A helicopters with specific serial numbers (ranging from serial number 4 to 133, with several gaps in the sequence).\n\n**What it requires:**\n- Replace the exhaust stack clamps on these helicopters.\n- Follow the instructions in Bell Service Letter 206A No. 38 (the manufacturer's technical document).\n- Complete this work within 25 hours of flight time after 1 April 1968.\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety instructions. If you don't comply, you cannot legally fly the aircraft. This particular directive addresses a specific mechanical issue with exhaust stack clamps that could affect flight safety. The 25-hour compliance window gives operators limited time to schedule maintenance without grounding aircraft immediately."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The supplied text sets a specific replacement requirement for exhaust stack clamps on defined Bell 206A serial numbers and a fixed compliance window. The instrument as presented does not include any language indicating a change in scope from an earlier version or original intent; no evidence in the provided text shows that the applicability or required action differs from an original or prior directive."},"complexity_factors":["Narrow and specific applicability to a defined set of serial numbers (low scope breadth).","Single, simple mandatory action (replacement of exhaust stack clamps) with a single short compliance timeframe (25 hours TIS).","Dependence on an external manufacturer document (Bell SL 206A No. 38) for technical procedure increases operational dependency but not legal complexity in the AD text itself.","Lack of procedural details, cost allocation, or exemption/appeal language in the supplied text reduces internal document complexity but shifts implementation detail to external documents and operational practice.","Historic dating (compliance counted from 1 April 1968) is a fixed temporal anchor that simplifies interpretation but may raise archival/record-keeping issues for implementers."],"plain_english_summary":"This Airworthiness Directive mandates replacement of the exhaust stack clamps on specified Bell 206A helicopters (listed serial numbers) within 25 hours time-in-service from 1 April 1968, citing Bell SL 206A No. 38 for the technical procedure.  \n\nIt affects owners/operators and maintenance organisations of those serial-numbered airframes, creates an immediate scheduling burden, and includes no cost allocation, exemption, or stated safety rationale in the supplied text."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-2-exhaust-stack-clamps-replacement","history":"/api/acts/ad-bell-206-2-exhaust-stack-clamps-replacement/history","analysis":"/api/acts/ad-bell-206-2-exhaust-stack-clamps-replacement/analysis","conflicts":"/api/acts/ad-bell-206-2-exhaust-stack-clamps-replacement/conflicts","importantCases":"/api/acts/ad-bell-206-2-exhaust-stack-clamps-replacement/important-cases","documents":"/api/acts/ad-bell-206-2-exhaust-stack-clamps-replacement/documents"}}