Final answer:
RAM AIR ventilation should be used when cabin pressure is lost in an aircraft. It provides a continuous flow of outside air into the cabin to ensure oxygen supply and prevent hypoxia.
Step-by-step explanation:
RAM AIR ventilation should be used primarily when the cabin pressure is lost in an aircraft. This ventilation system provides a continuous flow of outside air into the cabin to ensure a sufficient supply of oxygen for the occupants. It helps to maintain a safe and comfortable environment for passengers and crew during emergencies, such as sudden cabin depressurization.
The RAM AIR ventilation system works through special vents on the aircraft that direct outside air into the cabin. When cabin pressure is lost, the system automatically activates, allowing fresh air to enter the cabin and prevent hypoxia or oxygen deprivation.
Unlike the air conditioning system, which is used for temperature control, the primary purpose of RAM AIR ventilation is to maintain adequate oxygen levels in an emergency situation.