On the afternoon of January 20, Sichuan Airlines Flight 3U8884 of Beijing Capital-Chengdu Shuangliu hung up the 7700 emergency code before landing.
The emergency code is issued through the transponder on board the aircraft, which is a set of 4-digit octal digits with a value ranging from 0000 to 7777. The 7700 emergency code indicates flight fatality, the 7500 indicates hijacking, and the 7600 indicates a communication failure. According to the airline's cross-sectional display, the flight landed safely at Shuangliu Airport at 14:47.
It is understood that the aircraft is in the process of approaching the single engine (twin engine failure failure failure) failure, the faulty engine should be a round (left round), so the crew hung out 7700.
Some insiders said that the single-engine failure is not very difficult for the crew to deal with, and it belongs to the conventional project in training (not actual flight), but the Sichuan Airlines crew is also quite excellent in handling.
Some witnesses said that Shuangliu Airport also launched an emergency response for the first time, and ground rescue personnel, including fire trucks, entered the inner field and assembled outside the runway.
Civ, a zhihu user who took this flight, said that the plane landed twice, and the first landing suddenly had a strong sense of pushing back, and then was told to resume flight, the engine mechanical failure, and the second landing was smooth.
The situation is very calm, far less frightening than everyone thinks.
The flight in question was carried out by a 10.5-year-old Airbus A330-200 with nationality registration number B-6535 and two Rolls-Royce Trent 772C engines.
Since 2018, domestic flights with the 7700 code have also appeared several times:
At about 6:45 a.m. on May 14, 2018, Sichuan Airlines Flight 3U8633 from Chongqing to Lhasa hung up the 7700 code, which was aircraft type Airbus A319. According to the official response, the flight was diverted to Chengdu Shuangliu Airport at 7:46.
At about 18:00 on November 12, 2019, Flight MU5352 of China Eastern Airlines from Shenzhen to Shanghai hung up the 7700 code, and the aircraft type was Airbus A330. According to the data, flight MU5352 was diverted to Nanchang Changbei Airport at 19:22.
At about 19:00 on May 16, 2020, Qingdao Airlines flight QW6020, which was flying from Quanzhou to Shenyang, hung up the 7700 code, and the aircraft type was Airbus A320-214.
At about 11:10 p.m. on July 6, 2020, Ruili Airlines flight DR6558 Xi'an-Kunming, with its 7700 emergency code, was attached to Chongqing for diversion. According to the news of Fei Chang zhuan, DR6558 flight was reborn at Chongqing Jiangbei Airport at 23:28.
At 7:57 on August 9, 2020, Shenzhen Airlines ZH9209 airliner issued an emergency code of 7700 and returned to the ship. At 9:13, it has returned safely to Shenzhen Bao'an International Airport, and the crew normally controls the aircraft during the return voyage, and no crew and passengers are injured after landing, and Shenzhen Airlines will arrange other flights to transport passengers.