# 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

- **ID:** `emergency/helicopter-landing-zone-safety`
- **领域:** emergency
- **类别:** life_safety
- **错误码:** `HELI-LZ-ERR-001`
- **验证级别:** ai_generated
- **修复率:** 70%

## 根因

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

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| FAA Rotorcraft Flying Handbook (FAA-H-8083-21B) | active | — | — |
| HEMS (Helicopter Emergency Medical Services) standards | active | — | — |

## 解决方案

1. ```
   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
   ```
2. ```
   If landing zone is on a slope, always approach from the downhill side to avoid rotor strike; pilot will tilt rotors away from slope
   ```

## 无效尝试

- **Saying 'approach from the front to be seen by pilot'** — Front approach puts bystander in main rotor tip path; pilot cannot see directly ahead due to cockpit design (95% 失败率)
- **Advising 'crouch low and run under rotors'** — Rotor blades can dip to 4-5 feet at front; crouching does not guarantee safety and increases risk of disorientation (90% 失败率)