Aircraft cabin odor is a very common fault. Once it occurs, it is usually difficult to confirm and eliminate the fault. This is because the aircraft air conditioning system is associated with many other systems (such as engine air supply, APU air supply, etc.).
During the ground deicing process of the aircraft, it is necessary to turn off the air conditioning system of the aircraft cabin briefly.
The air-conditioning system ensures a constant supply of fresh air and maintains a constant selected temperature in the three areas of the cockpit, front cabin and rear cabin, mainly by conditioning the air entering the interior of the cabin. The air entering the cabin is regulated by mixing cold air and bleed air to the right temperature.