If the cabin is depressurizing slowly due to a small leak, what does HI FLOW do?

The function of HI FLOW in the context of a slow cabin depressurization due to a small leak is to double the amount of air entering the cabin. This setting increases the airflow to help maintain cabin pressure despite the leak. By providing additional air, HI FLOW supports the need for adequate pressurization and oxygen levels, which is crucial for passenger safety and comfort during such an incident.

In scenarios where the cabin is losing pressure, increasing the airflow helps mitigate the effects of the leak and ensures that the environment remains suitable for those on board. This action does not reduce cabin pressure or shut down the air supply, and it is not related to activating the emergency oxygen supply, which serves a different purpose in critical situations.