On January 23, on the second day of the first lunar month, Zhang Hairong, the maintenance engineer of China Eastern Airlines, walked into the apron with the morning light. Here was his old friend, the first aircraft delivered by China Eastern Airlines, the large domestic aircraft C919. This is the first Spring Festival since the C919, a large domestic aircraft, joined the fleet of China Eastern Airlines. There is no flight mission for C919 during the Spring Festival holiday. Zhang Hairong's main task is to maintain the C919 dynamically. "Today is mainly about power-on test and further inspection of APU function," said Zhang Hairong, who has entered the working state. After the holiday, the C919 will continue to carry out intensive verification flight. In order to ensure that the C919 maintains a good flight state, dynamic parking maintenance requires comprehensive inspection and maintenance of the aircraft. One of the important tasks is to conduct a power-on test every two days. Aircraft maintenance engineers are called "aircraft doctors". Aircraft maintenance needs not only to be comprehensive, but also to be meticulous. After the whole machine is powered on, Zhang Hairong and his colleagues should test every button, device and system, listen to the sound, see the brightness, observe the status... a set of processes is like "watching, hearing, asking and cutting". Rounding inspection is a "required course" for C919 to verify the flight before and after the flight at ordinary times. When the aircraft is not flying, the rounding inspection is also necessary. The maintenance engineers work in groups of 3 to 5 people every day, from the whole fuselage appearance to the landing gear, engine blades... every detail is not missed, to ensure that the aircraft can carry out flights normally at any time. Aircraft operation is a system engineering for support personnel. "Before each verification flight, in addition to the pre-flight inspection, we should also be familiar with the far seat of the shuttle bus operation and the near seat of the airport bridge operation. We will send the C919 off at different seats one after another, and each time we are very excited," said Xu Lei, the maintenance engineer of China Eastern Airlines, "We also introduced the operation process to the airport, aviation oil and other sister units that will jointly support the C919 commercial flight in the future, and we hope that the support team will grow stronger and stronger." In fact, in addition to the C919, China Eastern Airlines has also included the domestic new regional airliner ARJ21 in its fleet. In order to ensure the operation of domestic aircraft, China Eastern Airlines has specially established a domestic aircraft maintenance department. In addition to a serious, responsible and meticulous attitude, to ensure the safety of C919 requires system construction and technical upgrading. "After each flight mission, we will download the important data of the flight verification on the same day from the aircraft and transmit it to the manufacturer COMAC and the civil aviation management department to provide the key data for all units to jointly optimize, upgrade and launch the commercial flight," said Shi Hongwei, deputy general manager of the China Eastern Airlines Maintenance Engineering Department, "These data are too valuable, and we will continue to optimize and upgrade the aircraft on the basis of these data analysis." The reporter learned that China Eastern Airlines has equipped the C919 with an independently developed electronic flight record book ELB system with intellectual property rights. The flight engineer can record the flight related information in the tablet computer, and automatically access the background system of China Eastern Airlines' flight management for data analysis. In a few days, the C919 will usher in the first flight of the Year of the Rabbit. The crew will continue to complete the verification flight mission in the high temperature, high cold and high humidity areas to conduct a comprehensive inspection of the aircraft performance. At the same time, the cabin will also be optimized according to the feedback information of the verification flight. (Xinhua News Agency)