Recently, a piece of news related to "aircraft" was hot searched. On the morning and evening of August 9, Shenzhen Eastern Airlines passenger plane encountered an emergency of mechanical failure at high altitude. Shenzhen Airlines flight returned and took off again. China Eastern Airlines flight took off again after emergency alternate landing in Xi'an. Fortunately, all the staff and passengers on the plane were safe! On August 13, the person in charge of relevant departments of the Civil Aviation Administration announced the investigation results of the cabin pressure relief event of Shenzhen Airlines and the mechanical failure return event of China Eastern Airlines on August 9: after investigation, the event was caused by the failure of the rear cargo door sealing strip of the aircraft. Cabin pressure relief events are usually caused by cabin and cargo compartment sealing problems or air conditioning pressurization system failures.

After reading this news, everyone must have the same question. With the progress of science and technology, why can't our civil aviation still prevent this major air crash? Now let me lead you to analyze the reasons through Dongsheng seal:

The cargo door sealing strip is a ring tube structure with inflation holes, which is usually made of silicone rubber and fabric. The sealing strip is installed in the fixed slot of the cargo door frame to ensure that the inflation hole faces the inner side of the cargo door. When the cargo door is closed, the sealing strip is squeezed and contacted with the fuselage structure. As the cargo compartment is pressurized during flight, the pressurized air enters the sealing strip through the inflation hole on the sealing strip to make it close to the fuselage structure after inflation, so as to ensure the cargo compartment sealing.

The incorrect installation of the cargo door sealing strip will lead to the failure of the pressurized air to enter the inflation hole when the aircraft is pressurized, which will inflate the sealing strip, and then play the role of cargo compartment sealing, resulting in the failure to maintain or decrease the cabin pressure of the aircraft and affect the normal operation.

Then we adopt the following methods:

1: The cargo door sealing strip is usually a flexible ring pipe structure, which shall be paved and straightened out before installation. During installation, it shall be checked and confirmed that the installation position identification is consistent with the requirements of the manual. After installation, it shall be checked whether it is smoothly fixed in the clamping groove without distortion;

2: In the process of installing the sealing strip, if you cannot accurately understand the steps described in the manual or have doubts about the understanding, you can compare by observing the installation of the same or similar parts of the same aircraft.

3: The inspection after the installation of the cargo door sealing strip shall be checked and confirmed by the maintenance personnel inside the cargo door when the cargo door is closed.

The above is the analysis and suggestions of Dongsheng seal. Dongsheng seal is a technology-based CCTV interview enterprise mainly engaged in the R & D, manufacturing and sales of seal rings in various industries. The products are widely used in aerospace, military industry, petroleum, chemical industry, metallurgy, electric power, automobile, shipbuilding, coal mine, electronics, household appliances, bathroom, pump valve, papermaking, papermaking, hydraulic, pneumatic, robot, UAV, intelligent manufacturing, shield machine, construction machinery and other industries.

The product quality has reached the domestic high-end level and obtained the ISO 9001-2008 certification. At the same time, our products also meet the RoHS and reach specifications of the European Union, have reached the national quality level and passed the National Quality Supervision certification. The main markets of our products are Asia, Europe, the United States, the Middle East and major domestic cities. Cooperation with major domestic brands include Sany Heavy Industry, Foton Lovol, Hangcha group, XCMG group, etc. Dongsheng people will always adhere to our business philosophy: honesty and trustworthiness, pragmatic innovation, join hands with partners to realize common values and benefit the society!