& have spent The aircraft black box. Also known as the plane crash recorder, its main function is to record the plane's flight status, air and space on the phone. It consists of two parts, one is called accident recorder, record the height of the aircraft, speed, Angle and acceleration, etc., installed in the tail of the airplane, which applied to Angle sensor, the other one is called voice recorder, record the cockpit conversation, wireless dialogue and ran all sorts of sound, such as in aircraft cockpit of the head. It is the biggest characteristic of waterproof, high voltage, resistance to break, resistance to burn, in the plane crash and burn for various reasons or a case of a drop in sea water Watson Wchangeorganisation , can also be preserved related data will be accepted. Based on the information preserved, people can analyze the cause of the accident, in order to take countermeasures, to prevent similar accidents from happening again.