一辆东方红-12型小四轮拖拉机,在下坡时转向垂臂折断,操纵失控,机车冲出公路,高速滑向田间,遇一高埂,主车翻倒,将机手压在了车下。监理部门立即赶到现场,机手已死亡,在机手的上衣口袋内发现一新的转向垂臂。座谈会上,同伙介绍说:该机手曾发现转向垂臂有较轻微裂纹,从农机公司买一只新品装在口袋里 A Dongfanghong-12 small four-wheel tractor, turning down when the downhill to the broken arm, the control out of control, the locomotive out of the road, high-speed slide to the field, in case of a hodgepodge, the main car overturned, the hand pressure in the car under. Supervision department immediately rushed to the scene, the hand has died, found a new steering in the machine’s shirt pocket. At the symposium, the accomplice said: "The pilot had found that there was a slight crack in the steering arm and bought a new product from the farm machinery company in his pocket