{"id":"F2006B04437","name":"AD/BELL 206/122 - Tail Rotor Blade","slug":"ad-bell-206-122-tail-rotor-blade","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44274,"registerId":"commonwealth-F2006B04437-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 206/122 - Tail Rotor Blade","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 Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters\n\nAD/BELL 206/122 Tail Rotor Blade 12/90 TX\n\nApplicability: All model 206L, 206L-1, and 206L-3 helicopters equipped with tail rotor blades P/N 206-016-201-127.\n\nAll model 206A, 206A-1, 206B-1, 206JRII, 206JRIII, TH-57 series, and OH-58B\n\nhelicopters equipped with tail rotor blades P/N 206-016-201-125 or \\-127.\n\nRequirement: a. For model 206L, 206L-1, and 206L-3; inspect the tail rotor blades, and remove from service any blade with a serial number identified in Bell Alert Service Bulletin No 206L-90-71.\n\nb. For model 206A, 206A-1, 206B-1, 206BJRII, 206BJRIII, TH-57 series, and OH- 58B; inspect the tail rotor blades, and remove from service any blade with a serial number identified in Bell Alert Service Bulletin No 206-90-58.\n\nCompliance: Prior to further flight.\n\nBackground: An incident was recently reported to the manufacturer in which one tail rotor blade tip weight became dislodged in flight. Investigation has revealed that blades having 5/16 inch diameter threaded tip weights at the centre tip location are suspect. Non- destructive testing methods may not positively identify the condition.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete safety directive addressing a specific mechanical defect in specific helicopter models. It has not expanded beyond its original purpose of grounding suspect tail rotor blades."},"complexity_factors":["Single, specific mechanical defect addressed","Only 2 manufacturer service bulletins referenced","Clear applicability matrix based on 10 helicopter models and 2 part numbers","Binary compliance requirement: inspect and remove if serial number matches — no conditional logic or exceptions","No defined terms section or interpretation provisions","Immediate compliance with no phased implementation","Approximately 200 words total"],"plain_english_summary":"This CASA Airworthiness Directive orders immediate visual inspection and, where listed serial numbers are found, removal from service of certain tail rotor blades on Bell 206 LongRanger, JetRanger and specified military variants. It affects operators and maintenance organisations for those helicopters.\n\nIt’s prompted by an in-flight dislodged tail‑rotor tip weight that risks loss of control; standard NDT can’t reliably find the defect, so suspect blades must be removed before the next flight per the Bell Alert Service Bulletins."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive applies expressly to the models and part numbers named and directs inspection and removal per the manufacturer’s Alert Service Bulletins. The text shows no alteration or expansion of scope beyond those stated requirements."},"complexity_factors":["Multiple helicopter models covered (various 206-series variants) requiring cross-checking of fleet lists against applicability","Two different tail-rotor blade part numbers and two separate Bell Alert Service Bulletins to consult","Serial-number specific removals — requires accurate part/serial tracking and record checks","Immediate compliance 'prior to further flight' creates potential operational grounding and logistical urgency","Diagnostic uncertainty: nondestructive testing may not positively identify the condition, increasing likelihood of removal rather than repair","Reliance on manufacturer-issued Alert Service Bulletins for identification — limited discretionary interpretation by operators"],"plain_english_summary":"This airworthiness directive orders operators of listed Bell/Agusta 206-series helicopters with specified tail-rotor blade part numbers to inspect blades and remove from service any blade whose serial number appears in the manufacturer’s Alert Service Bulletin. (Requirement; Compliance: prior to further flight.) Operators bear the cost and operational disruption of inspections and any replacement; nondestructive testing may not reliably detect the defect, so removal is based on serial-number identification in the bulletin."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-122-tail-rotor-blade","history":"/api/acts/ad-bell-206-122-tail-rotor-blade/history","analysis":"/api/acts/ad-bell-206-122-tail-rotor-blade/analysis","conflicts":"/api/acts/ad-bell-206-122-tail-rotor-blade/conflicts","importantCases":"/api/acts/ad-bell-206-122-tail-rotor-blade/important-cases","documents":"/api/acts/ad-bell-206-122-tail-rotor-blade/documents"}}