What is the maximum normal cabin altitude for the CRJ 900 during flight?

The maximum normal cabin altitude for the CRJ 900 during flight is 8,000 feet. This limitation is crucial for ensuring passenger comfort and safety, as it helps to prevent hypoxia, a condition that can occur at higher altitudes due to reduced oxygen levels in the cabin.

The cabin altitude is maintained within this limit by the aircraft's environmental control system, which manages pressurization effectively during ascent and descent. Keeping the cabin altitude below 8,000 feet minimizes the physiological effects of altitude on passengers and crew, allowing them to remain alert and comfortable throughout the flight.

Understanding this limitation is essential for pilots and crew members as it directly influences their decision-making processes regarding flight operations and passenger safety. The other figures mentioned do not reflect the operational limits of the CRJ 900, as flying above 8,000 feet in terms of cabin altitude could lead to adverse effects on health and comfort.