What action should you take if the oxygen pressure gauge reaches 500 PSI?

• A. Continue using the same bottle
• B. Change the bottle
• C. Remove the mask
• D. Notify the passenger

Answer: (B)

When the oxygen pressure gauge reaches 500 PSI, it indicates that the oxygen supply is getting low. In this context, the appropriate action is to change the bottle. Keeping the oxygen supply at an adequate level is crucial for safety, especially in scenarios where supplemental oxygen is required for passengers or crew members. Continuing to use a bottle with such low pressure could risk running out of oxygen when it is needed most, which can jeopardize safety during a flight.

Switching to a full oxygen bottle ensures that there is a reliable supply available for use, thereby maintaining the well-being of everyone on board. Other options, such as removing the mask or notifying the passenger, do not address the essential need for an adequate oxygen supply in a timely manner. Hence, changing the bottle is the correct course of action in this situation.