How many floor-level exits must be provided at all times for passenger egress?

The regulatory requirement states that at least one floor-level exit must be provided for passenger egress in aircraft. This ensures that in the event of an emergency, there is a reliable means for all passengers to evacuate the aircraft promptly and safely.

Having a minimum of one floor-level exit facilitates faster evacuation and reduces the potential for overcrowding at exits during emergencies. Although more than one exit is advantageous in larger aircraft, the regulatory standard guarantees that there is always at least one accessible point for passengers to exit the aircraft safely in case of an emergency, which is foundational for safety protocols in aviation.

Other options do not meet the minimum requirement outlined in the regulations, and thus they would not provide the necessary safety assurances that the regulations demand.