飞机通过安装在机身外部的空速管来探测速度。由于飞机运行在特殊的高空低温环境,需要对空速管进行加温,避免结冰阻塞。本文着重阐述波音737NG飞机空速管加温的工作原理和故障成因,并对预防性维修措施进行了初步探索。 The aircraft detects the speed through a tube installed outside the fuselage. As the aircraft operating in a special high-altitude low-temperature environment, the need to heat pipe to avoid freezing blockage. This article focuses on the Boeing 737NG aircraft air-to-air tube heating principle and cause of failure, and preventive maintenance measures were explored.