{"id":"F2006B04480","name":"AD/BELL 206/24 - Engine Chip Detector Indicator - Installation","slug":"ad-bell-206-24-engine-chip-detector-indicator-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44317,"registerId":"commonwealth-F2006B04480-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 206/24 - Engine Chip Detector Indicator - Installation","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 206/24 Engine Chip Detector Indicator - Installation 6/70\n\nApplicability: All model 206A prior to S/No. 441 and model AB-206A. Document:  Bell SL No. 206A-129.\n\nCompliance: Within 100 hours time in service after 30 June 1970. Background: AD/Agusta 206/16 equivalent.\n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument sets out a targeted, model-and-serial-number-limited requirement (Applicability) to install an engine chip detector indicator following Bell SL No. 206A-129 (Document) within a specified flight-hours window (Compliance). The Background states it is equivalent to AD/Agusta 206/16, which indicates alignment rather than an explicit expansion or contraction of scope. The text contains no indication that its scope was changed from the original intent expressed in the directive (Applicability; Background)."},"complexity_factors":["Narrow, serial-numbered applicability requiring per-aircraft eligibility checks (Applicability).","Cross-reference to an external technical document (Bell SL No. 206A-129) for installation details rather than including technical steps in the AD (Document).","Compliance measured in airframe hours with a specific post-date window (100 hours TIS after 30 June 1970), which requires record checks and scheduling (Compliance).","Regulatory provenance listed (Civil Aviation Regulations 1998, PART 39 — Schedule of Airworthiness Directives), which locates the power to issue but leaves enforcement mechanics unstated (header).","Limited text length: procedural simplicity but reliance on external material increases implementation dependence and possible ambiguity about operational specifics (Document)."],"plain_english_summary":"This directive requires installation of an Engine Chip Detector Indicator on Bell 206A helicopters with serial numbers before S/No. 441 and on AB-206A models, following Bell Service Letter No. 206A-129, with compliance within 100 flight hours after 30 June 1970.\n\nIt affects owners/operators and maintenance providers, imposing short-term inspection/modification scheduling, parts and labour costs, and reliance on the referenced service letter for technical execution."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a historical AD from 1970 with a narrow, specific purpose: mandating a single safety modification to specific helicopter models. It has not expanded beyond its original scope."},"complexity_factors":["Extremely short document — only 6 paragraphs including header","Zero defined terms or interpretation sections","No cross-references to other legislation (only references a manufacturer service letter)","Simple conditional logic: single applicability test (model and serial number)","Single compliance requirement with clear deadline","No exceptions, exemptions, or nested conditions"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires specific repairs or modifications to aircraft.\n\n**What it does:** It orders owners and operators of certain **Bell 206 and Agusta-Bell 206 helicopters** to install an **engine chip detector indicator**. This device detects tiny metal particles (\"chips\") in the engine oil, which can signal internal engine damage before it causes catastrophic failure.\n\n**Who it affects:** \n- **Bell 206A helicopters** with serial numbers **before 441**\n- **Agusta-Bell AB-206A helicopters**\n\n**What must be done:** Install the chip detector indicator following **Bell Service Letter No. 206A-129**, and complete this work **within 100 hours of flight time after 30 June 1970**.\n\n**Why it matters:** Metal debris in engine oil is an early warning sign of bearing or gear failure. Without this detector, pilots might not know their engine is failing until it's too late. This AD prevents in-flight engine failures and potential crashes."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-24-engine-chip-detector-indicator-installation","history":"/api/acts/ad-bell-206-24-engine-chip-detector-indicator-installation/history","analysis":"/api/acts/ad-bell-206-24-engine-chip-detector-indicator-installation/analysis","conflicts":"/api/acts/ad-bell-206-24-engine-chip-detector-indicator-installation/conflicts","importantCases":"/api/acts/ad-bell-206-24-engine-chip-detector-indicator-installation/important-cases","documents":"/api/acts/ad-bell-206-24-engine-chip-detector-indicator-installation/documents"}}