Final answer:
The NORM position of the Cabin Altitude Selector is a setting that regulates the cabin altitude to maintain a comfortable and safe environment for passengers and crew.
Step-by-step explanation:
The NORM position of the Cabin Altitude Selector is a setting on aircraft that controls the cabin altitude. In this position, the cabin altitude is automatically regulated to maintain a comfortable and safe environment for passengers and crew.
When the NORM position is selected, the aircraft's pressurization system actively manages the cabin altitude to ensure it remains at a safe level, typically around 8,000 feet above sea level. This helps to prevent the negative effects of high altitude on the human body, such as hypoxia.
By keeping the cabin altitude at a lower level, the NORM position helps to maintain a higher concentration of oxygen in the cabin, making it easier for passengers and crew to breathe and reducing the risk of altitude-related health issues.