As the design and manufacturing process of aircraft accessories become more and more mature, the system failures of a certain type of aircraft air-conditioning system due to component failures have decreased year by year.

With the gradual increase in the age of the aircraft, and the damage to the air-conditioning system caused by catkins and air pollution in certain seasons, the performance of the air-conditioning system will be attenuated or even deteriorated when the new aircraft is put into use for about two years.