If AHI ON is selected and the TB HAB decreases below a specific point, to what depth will the TB be recovered?

When AHI ON is selected and the Total Breathable Air (TBA) Height Above Break (HAB) decreases below a set threshold, the recovery of the TBA is determined by operational protocols that prioritize safety and efficiency based on environmental conditions.

Selecting 100 FT HAB as the recovery depth suggests that this is the mandated protocol in place based on best practices and situational analysis during operations involving potential air supply issues or hazards at lower depths. This level is designed to ensure that any potential risks from environmental factors, such as gas buildup or inadequate oxygen levels, are sufficiently mitigated, allowing for a safe return to breathable conditions.

Other depths mentioned, such as 75 FT, 150 FT, and 200 FT HAB, either do not align with safety protocols outlined in training or do not offer optimum conditions for recovery based on the situation's dynamics and operational guidelines. Hence, 100 FT HAB stands as the appropriate depth reflecting the balance between safety protocols and operational efficiency.