{"id":"F2006B04414","name":"AD/BELL 206/100 - Main Rotor Blade Retaining Nuts P/N 206-011-119-1","slug":"ad-bell-206-100-main-rotor-blade-retaining-nuts-p-n-206-011-119-1","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44239,"registerId":"commonwealth-F2006B04414-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 206/100 - Main Rotor Blade Retaining Nuts P/N 206-011-119-1","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\nBell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters\n\nAD/BELL 206/100 Main Rotor Blade Retaining Nuts\n\nP/N 206-011-119-1\n\n  \n12/85\n\nApplicability: All Augusta Bell AB206A and AB206B helicopters up to and including S/N8692 equipped with P/N206-011-119-1 non- metallic locking feature nuts.\n\nRequirement: Augusta B.T. No. 206-168.\n\nCompliance: Part I: Before further flight after 4 November 1985 and thereafter at each daily inspection prior to compliance with Part II of the requirement document.\n\nPart II: Before further flight after 31 December 1985.\n\nBackground: An AB206B-1 helicopter main rotor blade retaining nut P/N206-011-119-1 was found cracked during a main rotor head inspection following reports of an abnormal vibration level, level, which became more evident during engine shut-down.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2463},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow scope targeting specific part numbers on specific helicopter models following a reported safety incident."},"complexity_factors":["Single specific part number identified (P/N 206-011-119-1)","Clear two-stage compliance schedule with fixed calendar dates","Limited to specific aircraft models and serial number range (up to S/N 8692)","Simple binary applicability test (equipped with specific nut type or not)"],"plain_english_summary":"This Airworthiness Directive orders owners/operators of Augusta Bell AB206A and AB206B helicopters (serials up to 8692) using part number 206-011-119-1 non‑metallic locking nuts to inspect and permanently repair main rotor blade retaining nuts. Immediate pre‑flight inspections are required until the permanent repair specified in Bell Technical Bulletin 206‑168 is completed by 31 December 1985. The action prevents catastrophic rotor‑blade detachment from cracked retaining nuts identified after vibration reports and an inspection finding."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-100-main-rotor-blade-retaining-nuts-p-n-206-011-119-1","history":"/api/acts/ad-bell-206-100-main-rotor-blade-retaining-nuts-p-n-206-011-119-1/history","analysis":"/api/acts/ad-bell-206-100-main-rotor-blade-retaining-nuts-p-n-206-011-119-1/analysis","conflicts":"/api/acts/ad-bell-206-100-main-rotor-blade-retaining-nuts-p-n-206-011-119-1/conflicts","importantCases":"/api/acts/ad-bell-206-100-main-rotor-blade-retaining-nuts-p-n-206-011-119-1/important-cases","documents":"/api/acts/ad-bell-206-100-main-rotor-blade-retaining-nuts-p-n-206-011-119-1/documents"}}