The Beijing News (Reporter Wu Linshu) On the afternoon of May 26, at Terminal 3 of Beijing Capital International Airport, United Airlines flight UA889 was suspected to have a fire on the right engine during the take-off phase, which led to the cancellation of the flight. In the early morning of May 27th, the Beijing News reporter learned from the passengers on duty that the crew on board were safe and the airline company arranged to take off at the same time on the 27th.

According to public information, the aircraft type of United Airlines flight UA889 on 26th was Boeing 777-222(ER) dual-channel wide-body passenger plane, with an age of 27.6 years. It flew from Beijing to San Francisco, and the actual take-off time was 17: 45.

According to a passenger sitting in the window of the right aisle of the plane, during the acceleration of the runway, he heard an abnormal sound from the outside, and then he saw a flash of fire under the right wing. Just when he felt that the nose was slightly raised and the wheel had not yet left the ground, the plane braked suddenly and stopped taking off on the runway. A number of firefighters arrived at the runway and sprayed liquid on the left and right engines of the plane. There are also many fire engines, ambulances and police cars parked near the plane. When the captain on duty made the on-board broadcast, his tone was more relaxed, informing the passengers that the engine on the right side had failed, and said, "It seems that only one engine can’t reach San Francisco."

In the early morning of May 27th, the Beijing News reporter learned from Beijing Capital International Airport that flight UA889 on the 26th has been cancelled. At present, the take-off and landing flights of the airport are normal, and the scheduled departure time of the flight on the 27th is 17: 25. Subsequently, the Beijing News reporter asked the Beijing Capital International Airport Fire Rescue Management Center, and the other party said that it was not convenient to disclose the fire-related information for the time being.

On the morning of May 27th, the Beijing News reporter learned from the customer service office of United Airlines that flight UA889 on the 26th could not take off due to "technical failure".

A maintenance engineer of a large domestic airline company who has been repairing Boeing aircraft all the year round told the Beijing News reporter that according to the video released by passengers, the initial analysis was that the right engine had a fire, but it was uncertain whether the fire had been going on all the time. "If it continues to burn, the situation will be more urgent." "Sudden braking" actually means "interrupting takeoff". According to the regulations, as long as the speed does not reach the value of decision speed V1, the takeoff can be stopped. "So there will be sudden braking, which is generally not a big problem."

According to public information, V1 speed is an aviation term, which refers to the maximum speed that a flight crew can safely interrupt takeoff and stop the aircraft within the acceleration stop distance during takeoff, also known as decision speed. This speed is comprehensively calculated by factors such as aircraft weight, runway status and environmental conditions, and is a key parameter for takeoff performance. The speed of V1 marks the critical point of interrupting takeoff and continuing takeoff. When the speed is less than or equal to V1, the pilot must take measures to ensure that the aircraft can stop in the remaining runway even if there is a single engine failure. If it exceeds V1, it is necessary to continue to take off to a safe altitude no matter what kind of fault occurs.

The above-mentioned maintenance engineer said that if the aircraft takes off and the landing gear is retracted, it may need to return. "If the fire disappears, it is basically necessary to drain the oil and lose weight before landing; If the fire continues and there is no way to drain the oil and land, the situation will be even more dangerous. " In addition, he mentioned that the engine has a service life and will be replaced when it expires. "Although this plane is old, it may be equipped with a relatively new engine. Therefore, the failure of the engine has little to do with the age of the engine. If the line is aging, or the fuselage structure is a problem, it may be related to the age of the machine. "

Editor Liu Qian proofreads Wang Xin.

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　　CCTV News:The Central Meteorological Observatory continued to issue a high-temperature orange warning at 06: 00 on June 24. It is estimated that there will be high-temperature weather above 35 C in North China, Huanghuai and other places during the day on June 24, among which the highest temperature in Beijing, Tianjin, Hebei, north-central Shandong and northern Henan is 37 ~ 39 C, and some areas in Beijing, Tianjin, central Hebei and northern Shandong can reach about 40 C; In addition, Turpan and southern Xinjiang basin in Xinjiang, western and central Inner Mongolia and other places also have high temperature of 35~38℃, and the local maximum temperature can reach about 40℃.

　　Defense guide:

　　1, the relevant departments and units in accordance with the responsibilities of the implementation of heatstroke prevention and cooling measures;

　　2. Try to avoid outdoor activities at high temperature, and the personnel working at high temperature should shorten the continuous working hours;

　　3. Provide heatstroke prevention and cooling guidance to the old, weak, sick and young people, and take necessary protective measures;

　　4, the relevant departments and units should pay attention to prevent fires caused by excessive electricity consumption, as well as wires, transformers and other power loads.