{"id":"F2006B04533","name":"AD/BELL 206/81 - Auxiliary Fin - Inspection","slug":"ad-bell-206-81-auxiliary-fin-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114249,"registerId":"commonwealth-F2006B04533-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 206/81 - Auxiliary Fin - Inspection","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 206/81 Auxiliary Fin - Inspection 1/80\n\nApplicability: All model 206L and 206L-1 series helicopters with S/Nos. as listed in the requirement document, and which have not been modified in accordance with Part II of the requirement document.\n\n \n\nDocument: Bell Helicopter Textron Technical Bulletin No. 206L-79-34, Part 1. Compliance: As detailed in the requirement document.\n\nBackground: Fatigue cracks in the auxiliary fins have been found in service on two overseas aircraft.\n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1578},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This airworthiness directive maintains its original focused scope: addressing a specific structural fatigue issue in the auxiliary fins of defined helicopter models. The directive targets a discrete safety defect discovered in service without expanding beyond the necessary inspection requirements."},"complexity_factors":["Requires cross-referencing an external technical document (Bell Helicopter Textron Technical Bulletin 206L-79-34)","Applicability limited to specific serial numbers not listed within the directive text itself","Conditional exclusion for aircraft already modified per Part II of the requirement document"],"plain_english_summary":"**What this does:**\nThis directive mandates safety inspections of the auxiliary fins (small vertical stabilizers at the tail) on specific Bell helicopter models to check for fatigue cracks.\n\n**Who it affects:**\nOwners and operators of:\n- Bell 206L series helicopters\n- Bell 206L-1 series helicopters\n- Only those with specific serial numbers listed in the technical bulletin referenced below\n- Only if the helicopter has **not** already been modified according to Part II of that same bulletin\n\n**Why it matters:**\nFatigue cracks (tiny cracks caused by repeated stress during flight) were discovered in the auxiliary fins of two helicopters operating overseas. These cracks could potentially lead to structural failure of the tail section, creating a serious flight safety risk.\n\n**What must be done:**\nOperators must follow the inspection procedures detailed in **Bell Helicopter Textron Technical Bulletin No. 206L-79-34, Part 1**."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-81-auxiliary-fin-inspection","history":"/api/acts/ad-bell-206-81-auxiliary-fin-inspection/history","analysis":"/api/acts/ad-bell-206-81-auxiliary-fin-inspection/analysis","conflicts":"/api/acts/ad-bell-206-81-auxiliary-fin-inspection/conflicts","importantCases":"/api/acts/ad-bell-206-81-auxiliary-fin-inspection/important-cases","documents":"/api/acts/ad-bell-206-81-auxiliary-fin-inspection/documents"}}