What controls the flow of air to the cabin during flight?

The air flow to the cabin during flight is primarily controlled by the Air Conditioning Packs. These packs are responsible for cooling and conditioning the incoming air before it is circulated throughout the cabin. They take bleed air, which is high-pressure air taken from the engine or the APU, and process it to ensure that passengers and crew have a comfortable environment.

Air Conditioning Packs manage the temperature, humidity, and airflow, making them critical for overall cabin comfort. By modulating the conditioned air flow and incorporating it into the cabin pressure system, they help maintain proper air quality and temperature. This is essential, especially during different phases of flight where external conditions can change significantly.

While the other systems—such as the Cabin Pressure System, Environmental Control System, and Bleed Air System—play roles in managing cabin pressure and environmental conditions, it is the Air Conditioning Packs that directly handle the flow of air that passengers breathe.