What happens to OBOGS when the BLEED AIR inflow switch is turned OFF?

When the BLEED AIR inflow switch is turned off, the OBOGS (On-Board Oxygen Generation System) functionality remains unchanged because OBOGS is designed to produce oxygen from the aircraft's bleed air system. Even when the bleed air inflow is turned off, OBOGS can continue to operate normally under specific conditions, as it doesn't solely rely on the bleed air supply for its functions.

It's important to note that the OBOGS utilizes the aircraft’s bleed air to generate a continuous supply of oxygen, but when the air inflow is stopped, the system can still draw upon its internal capabilities for oxygen enrichment depending on the altitude and pressure. This attribute ensures that even in situations where the bleed air source is interrupted, the safety of the pilots is maintained as long as the system is fully functional and operational.

All other options describe scenarios that are either incorrect or do not fully capture the behavior of the OBOGS when the bleed air inflow is switched off.