If medics request a sea-level cabin, which pressurization mode is used and what does it set the maximum cabin altitude to?

• A. Normal operating mode; max altitude unchanged
• B. Low Cab mode; max cabin altitude set to destination airport elevation
• C. High Altitude mode; max cabin altitude set to 10,000 feet
• D. Auto mode; max cabin altitude set to 8,000 feet

Answer: (B)

Keep the cabin as low as possible for patient comfort and safety. Low Cab mode is designed for that scenario: it limits the pressurization so the cabin altitude stays as low as feasible and sets the maximum cabin altitude to the destination airport elevation. By tying the limit to the destination elevation, the system ensures the cabin remains near sea level when you arrive, which is why this mode is the best fit for a sea-level cabin request. Normal operating mode maintains a standard cabin pressure schedule, High Altitude mode allows a higher cabin altitude, and Auto mode selects based on altitude without specifically targeting sea level.