# 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

- **ID:** `emergency/helicopter-approach-zone`
- **领域:** emergency
- **类别:** life_safety
- **错误码:** `HELI-APPROACH-ERR-001`
- **验证级别:** ai_generated
- **修复率:** 85%

## 根因

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。

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| FAA AC 90-95B | active | — | — |
| NFPA 1670 2023 | active | — | — |

## 解决方案

1. ```
   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).
   ```
2. ```
   If helicopter is on slope, approach from uphill side to avoid rotor dip. Never carry long objects vertically. Follow crew instructions precisely.
   ```

## 无效尝试

- **Approach from the front so pilot can see you clearly** — Pilot may be focused on landing zone; front approach increases risk of walking into main rotor blades; pilot cannot see directly below cockpit. (90% 失败率)
- **Approach from the side to avoid tail rotor** — Side approach may be in pilot's blind spot; rotor downwash can cause instability; side doors may be blocked by equipment. (75% 失败率)
- **Run directly toward helicopter to get help quickly** — Running increases risk of tripping into rotor; tail rotor is not visible from ground; extreme danger of decapitation. (95% 失败率)