In the preflight of the Portable Oxygen Bottle (POB), what should the PSI not be below on the EMB?

The correct answer indicates that during the preflight inspection of the Portable Oxygen Bottle (POB) on the EMB, the pressure should be no less than 1200 PSI. This lower limit is crucial to ensure that the POB is adequately filled with oxygen and can function properly in an emergency situation. Maintaining a sufficient PSI ensures that there is enough oxygen available for use, which is vital for passengers or crew members who may require supplemental oxygen due to altitude or other factors.

A PSI reading below this threshold could indicate that the bottle is underfilled or has lost pressure due to a leak, rendering it ineffective in an emergency scenario. Additionally, operating with a bottle below the recommended PSI may compromise safety protocols and responses in case of oxygen necessity. Hence, ensuring the POB is above this minimum pressure is a critical safety measure in aviation operations.