1. The fever
Is that the temperature rises too fast, so that the temperature value exceeds the maximum limit of the specified value, and even appear smoke and other adverse phenomena.
2. The vibration
Refers to the fuselage and its movement part vibration amplitude exceeded the stipulation permissible scope, became abnormal.
3. Abnormal sound
Abnormal sound, refers to the vertical lathe internal impact sound, friction sound or impact sound.
4.Crawling and impact movements
Mainly appears in the sliding friction surface guide rail, the main speed is slow or fast, or a brief stop and suddenly forward.The speed is uneven and irregular.
5. Tooth breakage of gear
The main is to hear the sound of broken metal, and the transmission parts produce periodic abnormal sound.