What should be done with the OBOGS supply lever during a hypoxia emergency?

In a hypoxia emergency, the appropriate action for the OBOGS (On-Board Oxygen Generating System) supply lever is to turn it OFF. This is because, in the event of hypoxia, it may indicate an issue with the oxygen delivery or contamination of the system. By shutting off the OBOGS, the pilot prevents potential inhalation of hazardous elements or additional risk that could stem from a malfunctioning OBOGS.

Turning the supply lever OFF is a critical step to ensure that the pilot can then rely on alternative oxygen supply systems, such as the emergency oxygen system, which is designed for immediate use in such emergencies. It is essential to prioritize safety and effective response in high-altitude environments where hypoxia can occur suddenly and severely affect cognitive and physical performance. This procedure helps to safeguard against the risks associated with an inoperable or compromised oxygen system during critical flight operations.