{"id":"F2006B04423","name":"AD/BELL 206/11 - Main Rotor Blade Retention Bolt - Inspection","slug":"ad-bell-206-11-main-rotor-blade-retention-bolt-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44248,"registerId":"commonwealth-F2006B04423-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 206/11 - Main Rotor Blade Retention Bolt - 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 206/11 Main Rotor Blade Retention Bolt - Inspection 2/69\n\nApplicability: All model 206A prior to S/Nos. 175 and AB-206A prior to S/No. 8080, plus spare blade retention bolts P/N | 206-010-152-1.\n\n \n\nDocument: Bell SL No. 206A-55.\n\n \n\nNote: Agusta SB No. BT206-21 refers.\n\n \n\nCompliance: Within 100 hours time in service after 14 Feb. 1969 for installed bolts, and before installation in an aircraft for replacement bolts.\n\n \n\nBackground: AD/Agusta 206/3 equivalent.\n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":3022},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow scope targeting a specific hardware defect in defined helicopter models and spare parts. No evidence of expansion beyond the original mechanical inspection intent."},"complexity_factors":["Single mechanical component addressed in 5 short paragraphs with no subdivisions","Narrow applicability limited to specific serial number ranges (below 175 and 8080) and one part number","Simple compliance trigger: 100 hours time-in-service from a fixed date, or pre-installation check","Minimal cross-referencing (only to Bell Service Letter and Agusta Service Bulletin)"],"plain_english_summary":"This Airworthiness Directive mandates a **safety inspection of main rotor blade retention bolts** on specific early-model Bell helicopters.\n\n**Who must comply:**\n- Operators of Bell 206A helicopters with serial numbers below 175\n- Operators of Agusta-Bell AB-206A helicopters with serial numbers below 8080\n- Holders of spare blade retention bolts part number 206-010-152-1\n\n**What you must do:**\nInspect these critical bolts—which secure the rotor blades to the helicopter mast—within **100 hours of flight time** after 14 February 1969 (if already installed), or **before installation** (if fitting replacement bolts).\n\n**Why it matters:**\nThis is a mandatory safety requirement issued under civil aviation regulations to prevent catastrophic rotor blade failure. It enforces a manufacturer service bulletin that identified potential defects in these specific bolts. Non-compliance is a breach of aviation law."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-11-main-rotor-blade-retention-bolt-inspection","history":"/api/acts/ad-bell-206-11-main-rotor-blade-retention-bolt-inspection/history","analysis":"/api/acts/ad-bell-206-11-main-rotor-blade-retention-bolt-inspection/analysis","conflicts":"/api/acts/ad-bell-206-11-main-rotor-blade-retention-bolt-inspection/conflicts","importantCases":"/api/acts/ad-bell-206-11-main-rotor-blade-retention-bolt-inspection/important-cases","documents":"/api/acts/ad-bell-206-11-main-rotor-blade-retention-bolt-inspection/documents"}}