What should be done if the POB gauge falls below a certain pressure?

If the Portable Oxygen Bottle (POB) gauge falls below a certain pressure, reporting it to the captain is essential for several reasons. First, the captain is responsible for the safety of all passengers and crew on board. A low-pressure reading on the POB indicates that the oxygen supply may be insufficient for the needs of passengers or crew who require supplemental oxygen, especially in emergency situations.

By notifying the captain, appropriate actions can be taken, such as securing additional oxygen supplies, preparing for potential passenger needs, or even preparing for a landing if necessary. This ensures that the airline maintains safety standards and is prepared for any situation that might arise due to the decrease in oxygen availability.

The other choices do not prioritize safety and effective communication. Continuing to use the POB until it’s empty would fail to address the potential for low oxygen availability, and no action being needed would neglect the need for monitoring and addressing the oxygen supply. Replacing the POB immediately could waste resources if the bottle can still provide oxygen in an emergency or if the low pressure is not critical at that moment. Therefore, informing the captain ensures that the overall safety protocols are upheld and that there is an organized response to the situation.