What is the status of the OBOGS when the emergency oxygen flow begins?

When emergency oxygen flow begins, it indicates that the On-Board Oxygen Generating System (OBOGS) has encountered a failure. The emergency oxygen flow is a backup mechanism that activates when there is a problem with the primary oxygen generating system. This apparatus automatically delivers supplemental oxygen to ensure that the pilot can maintain adequate oxygen levels in case the OBOGS cannot perform its function effectively.

In this context, the activation of emergency oxygen flow signals a critical issue with the OBOGS, necessitating immediate reliance on backup oxygen sources to ensure pilot safety and operational integrity during flight. This understanding of OBOGS operation and emergency protocols is essential for maintaining situational awareness during flight operations.