What occurs when the BAG VENT Switch is set to ON during flight?

When the BAG VENT Switch is set to ON during flight, it directs the system to select the Baggage Vent Valve to the fully open position. This action is crucial for ensuring that any fumes or excess heat in the baggage compartment are vented outside of the aircraft, promoting safety and maintaining acceptable conditions within the cargo area.

Moreover, this fully open position allows for adequate ventilation, which is essential for preventing any buildup of potentially hazardous conditions associated with baggage, such as overheating or the presence of flammable materials. Maintaining good airflow in the baggage compartment is a vital measure taken during flight operations to enhance safety, particularly in managing the risks associated with transporting goods that may generate heat or emit toxic fumes.

This specific operation does not merely partially open the valve, activate heating systems, or deactivate pressure systems, as such actions would not effectively address the need for comprehensive ventilation required in the baggage area during flight.