{
  "id": "emergency/helicopter-approach-zone",
  "signature": "AI tells bystanders to approach a helicopter from the front or sides, but the correct approach is from the rear or sides within pilot's view",
  "signature_zh": "AI告诉旁观者从前方或侧面接近直升机，但正确的接近方式是从后方或飞行员可见的侧面",
  "regex": "helicopter.*(?:approach|approaching).*(?:front|side|rear)",
  "domain": "emergency",
  "category": "life_safety",
  "subcategory": null,
  "root_cause": "Helicopter tail rotor is invisible and lethal; front approach risks pilot distraction and rotor strike; rear/side approach within pilot's peripheral vision is safest per FAA guidelines.",
  "root_cause_type": "generic",
  "root_cause_zh": "直升机尾桨不可见且致命；前方接近有分散飞行员注意力和旋翼撞击的风险；根据FAA指南，飞行员周边视野内的后方/侧面接近最安全。",
  "versions": [
    {
      "version": "FAA AC 90-95B",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "NFPA 1670 2023",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "Approach from the front so pilot can see you clearly",
      "why_fails": "Pilot may be focused on landing zone; front approach increases risk of walking into main rotor blades; pilot cannot see directly below cockpit.",
      "fail_rate": 0.9,
      "condition": "",
      "sources": []
    },
    {
      "action": "Approach from the side to avoid tail rotor",
      "why_fails": "Side approach may be in pilot's blind spot; rotor downwash can cause instability; side doors may be blocked by equipment.",
      "fail_rate": 0.75,
      "condition": "",
      "sources": []
    },
    {
      "action": "Run directly toward helicopter to get help quickly",
      "why_fails": "Running increases risk of tripping into rotor; tail rotor is not visible from ground; extreme danger of decapitation.",
      "fail_rate": 0.95,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "Wait for pilot or crew member to signal approach. Approach from the front/side 45-degree angle within pilot's view, but stay low and maintain eye contact with pilot. Never approach from rear (tail rotor).",
      "success_rate": 0.85,
      "how": "Wait for pilot or crew member to signal approach. Approach from the front/side 45-degree angle within pilot's view, but stay low and maintain eye contact with pilot. Never approach from rear (tail rotor).",
      "condition": "",
      "sources": []
    },
    {
      "action": "If helicopter is on slope, approach from uphill side to avoid rotor dip. Never carry long objects vertically. Follow crew instructions precisely.",
      "success_rate": 0.8,
      "how": "If helicopter is on slope, approach from uphill side to avoid rotor dip. Never carry long objects vertically. Follow crew instructions precisely.",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [
    "Wait for pilot or crew member to signal approach. Approach from the front/side 45-degree angle within pilot's view, but stay low and maintain eye contact with pilot. Never approach from rear (tail rotor).",
    "If helicopter is on slope, approach from uphill side to avoid rotor dip. Never carry long objects vertically. Follow crew instructions precisely."
  ],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": "https://www.faa.gov/regulations_policies/advisory_circulars/index.cfm/go/document.information/documentID/1030471",
  "official_doc_section": null,
  "error_code": "HELI-APPROACH-ERR-001",
  "verification_tier": "ai_generated",
  "confidence": 0.87,
  "fix_success_rate": 0.85,
  "resolvable": "true",
  "first_seen": "2024-04-05",
  "last_confirmed": "2024-06-01",
  "last_updated": "2024-06-01",
  "evidence_count": 1,
  "tags": [],
  "locale": "en",
  "aliases": []
}