An emergency code was issued and the 262 people on board the plane from Los Angeles to Beijing suffered a sudden malfunction and were forced to turn back.

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Summary of article:

United Airlines UA771 from Los Angeles to Beijing issued emergency code 7700 and returned due to mechanical failure. Fortunately, none of the 262 people on board were injured, and the airline has arranged for backup flights to continue.

A United Airlines flightlos angeles The passenger plane bound for Beijing took off on the morning of the 25th. During the flight, it entered an air circle and issued a 7700 transponder code representing an emergency situation. Later, the plane was forced to change its route and return to Los Angeles. United Airlines has not announced the specific cause of the mechanical failure, and no one was injured in the incident.

According to widespread reports such as aviation information website AIRLIVE and Southern Metropolis Daily, the flight involved was UA771, operated by?boeing The Boeing 787-9 Dreamliner is in operation. The flight was originally scheduled to begin at approximately 1 am local time on the 25th.Los Angeles International Airport (LAX), flight time is about 17 hours, flying across the Pacific to Beijing Capital International Airport, and is expected to arrive on the morning of the 26th, Beijing time.

Flight tracking data showed that shortly after takeoff, the aircraft stopped climbing when it reached approximately 28,000 feet and then circled in the air to allow the crew to deal with the situation. Shortly afterward, the crew issued the 7700 emergency transponder code, declaring an emergency on the aircraft, and then diverted back to Los Angeles. It is reported that 7700 is an emergency response code for international aviation, indicating that the aircraft encounters an emergency that requires priority assistance from air traffic control. However, this code alone cannot determine the specific nature or severity of the fault.

There were 248 passengers and 14 crew members on board the aircraft at the time of the accident, for a total of 262 people. United Airlines said the passenger plane returned due to mechanical failure and landed safely at LAX. All passengers disembarked normally at the boarding gate. The airline then arranged for another aircraft and new crew to continue the flight to Beijing. So far, the airline has not announced the specific cause of the mechanical failure, nor has it said which system of the passenger plane is having the problem.

Summary FAQ


  • The United Airlines flight UA771 involved in the incident was suspected to have suffered a mechanical failure shortly after takeoff. The crew first circled to deal with it, then issued the 7700 emergency transponder code, and were ultimately forced to return to Los Angeles for a safe landing.


  • 7700 is the general emergency code for international aviation. This indicates that the aircraft is experiencing an emergency situation that requires priority assistance from air traffic control. However, the specific type or severity of the failure cannot be determined based on the code alone.


  • There were 248 passengers and 14 crew members, a total of 262 people, on board the plane at the time of the accident, and they all landed normally in Los Angeles. United Airlines later arranged for another aircraft and a new crew to continue the flight to Beijing.

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