{"id":"F2006B04494","name":"AD/BELL 206/39 - Nut P/N 1022A14 Main Rotor Hub Latch Bolt and Blade Retention Bolt - Inspection","slug":"ad-bell-206-39-nut-p-n-1022a14-main-rotor-hub-latch-bolt-and-blade-retention-bolt-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114188,"registerId":"commonwealth-F2006B04494-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 206/39 - Nut P/N 1022A14 Main Rotor Hub Latch Bolt and 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\n![](image.001.png)  Bell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters\n\n \n\n# AD/BELL 206/39 Nut P/N 1022A14 Main Rotor Hub Latch Bolt\n\nand Blade Retention Bolt - Inspection\n\nApplicability: All models delivered prior to 20 November 1972. Document: Bell SB No. 206-24, or Agusta SB No. BT206-56.\n\n# 1/73\n\nCompliance: 1. Visual Inspection - At each daily or overnight inspection after 15 December 1972 until the magnetic particle inspection is performed.\n\n \n\n2. Magnetic Particle Inspection - within 25 hours time in service after 15 December 1972.\n\n \n\nBackground: AD/Agusta 206/28 equivalent.\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1878},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This airworthiness directive maintains its original narrow scope targeting a specific defective part on specific helicopter models. It has not expanded beyond its initial safety purpose."},"complexity_factors":["Specific part number identification (P/N 1022A14)","Dual compliance pathways (visual and magnetic particle inspection)","Specific manufacturing cutoff date (20 November 1972)","Time-based compliance metric (25 hours 'time in service')","Cross-reference to manufacturer service bulletins"],"plain_english_summary":"**What this does:** This safety directive requires owners of early Bell 206 helicopters to inspect a specific nut that keeps the main rotor blades attached to the aircraft.\n\n**Who it affects:** Anyone operating Bell 206 or Agusta-Bell 206 helicopters delivered before 20 November 1972.\n\n**What must be done:**\n*   **Visual checks:** Look at the nut (part number 1022A14) every day or overnight until the detailed inspection is completed.\n*   **Detailed inspection:** Within 25 hours of flying time after mid-December 1972, conduct a **magnetic particle inspection** (a specialized test using magnets and iron powder to detect cracks) on this nut.\n\n**Why it matters:** This nut is critical for holding the main rotor blades in place. Failure could cause the blades to detach in flight. The directive references manufacturer service bulletins (Bell SB 206-24 and Agusta SB BT206-56) that identified defects in this part."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-39-nut-p-n-1022a14-main-rotor-hub-latch-bolt-and-blade-retention-bolt-inspection","history":"/api/acts/ad-bell-206-39-nut-p-n-1022a14-main-rotor-hub-latch-bolt-and-blade-retention-bolt-inspection/history","analysis":"/api/acts/ad-bell-206-39-nut-p-n-1022a14-main-rotor-hub-latch-bolt-and-blade-retention-bolt-inspection/analysis","conflicts":"/api/acts/ad-bell-206-39-nut-p-n-1022a14-main-rotor-hub-latch-bolt-and-blade-retention-bolt-inspection/conflicts","importantCases":"/api/acts/ad-bell-206-39-nut-p-n-1022a14-main-rotor-hub-latch-bolt-and-blade-retention-bolt-inspection/important-cases","documents":"/api/acts/ad-bell-206-39-nut-p-n-1022a14-main-rotor-hub-latch-bolt-and-blade-retention-bolt-inspection/documents"}}