{
  "id": "emergency/helicopter-landing-zone-safety",
  "signature": "AI tells bystanders to approach a helicopter from the front or sides, but the correct approach is from the rear or sides within the pilot's view; front approach risks rotor strike",
  "signature_zh": "AI告诉旁观者从前方或侧面接近直升机，但正确做法是从后方或飞行员视野内的侧面接近；前方接近有旋翼撞击风险",
  "regex": "approach.*helicopter.*front|side.*approach.*helicopter",
  "domain": "emergency",
  "category": "life_safety",
  "subcategory": null,
  "root_cause": "AI fails to account for helicopter rotor geometry: main rotor blades dip at the front (due to cyclic control), making front approach deadly; rear or side approach within pilot's view is standard",
  "root_cause_type": "generic",
  "root_cause_zh": "AI未考虑直升机旋翼几何结构：主旋翼桨叶在机头处下垂（循环控制所致），前方接近致命；后方或飞行员视野内的侧面接近是标准做法",
  "versions": [
    {
      "version": "FAA Rotorcraft Flying Handbook (FAA-H-8083-21B)",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "HEMS (Helicopter Emergency Medical Services) standards",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "Saying 'approach from the front to be seen by pilot'",
      "why_fails": "Front approach puts bystander in main rotor tip path; pilot cannot see directly ahead due to cockpit design",
      "fail_rate": 0.95,
      "condition": "",
      "sources": []
    },
    {
      "action": "Advising 'crouch low and run under rotors'",
      "why_fails": "Rotor blades can dip to 4-5 feet at front; crouching does not guarantee safety and increases risk of disorientation",
      "fail_rate": 0.9,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "Approach from the rear or side within pilot's field of view (3-9 o'clock position relative to cockpit), maintain eye contact, and never walk uphill toward a helicopter on a slope",
      "success_rate": 0.85,
      "how": "Approach from the rear or side within pilot's field of view (3-9 o'clock position relative to cockpit), maintain eye contact, and never walk uphill toward a helicopter on a slope",
      "condition": "",
      "sources": []
    },
    {
      "action": "If landing zone is on a slope, always approach from the downhill side to avoid rotor strike; pilot will tilt rotors away from slope",
      "success_rate": 0.8,
      "how": "If landing zone is on a slope, always approach from the downhill side to avoid rotor strike; pilot will tilt rotors away from slope",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [
    "Approach from the rear or side within pilot's field of view (3-9 o'clock position relative to cockpit), maintain eye contact, and never walk uphill toward a helicopter on a slope",
    "If landing zone is on a slope, always approach from the downhill side to avoid rotor strike; pilot will tilt rotors away from slope"
  ],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": "https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/rotorcraft_flying_handbook",
  "official_doc_section": null,
  "error_code": "HELI-LZ-ERR-001",
  "verification_tier": "ai_generated",
  "confidence": 0.82,
  "fix_success_rate": 0.7,
  "resolvable": "true",
  "first_seen": "2024-08-10",
  "last_confirmed": "2024-06-01",
  "last_updated": "2024-06-01",
  "evidence_count": 1,
  "tags": [],
  "locale": "en",
  "aliases": []
}