After landing with the pressurization system in manual mode, what will the RPCU do?

After landing with the pressurization system in manual mode, what will the RPCU do?

• A. Open The Outflow Valve
• B. Maintain Cabin Pressure
• C. The Residual Pressure Control Unit (RPCU) Will Automatically Depressurize The Aircraft
• D. Lock The Cabin Pressure

Answer: (C)

In manual mode, the Residual Pressure Control Unit (RPCU) governs the outflow valve to regulate cabin pressure. After landing, the system is designed to vent the cabin to ambient automatically. The RPCU detects that the aircraft is on the ground and commands the outflow valve to open enough to equalize cabin pressure with outside air, effectively depressurizing the cabin. This prevents keeping the cabin pressurized when it’s no longer needed and prepares the aircraft for ground operations. So the automatic action is depressurization to ambient pressure.

In manual mode, the Residual Pressure Control Unit (RPCU) governs the outflow valve to regulate cabin pressure. After landing, the system is designed to vent the cabin to ambient automatically. The RPCU detects that the aircraft is on the ground and commands the outflow valve to open enough to equalize cabin pressure with outside air, effectively depressurizing the cabin. This prevents keeping the cabin pressurized when it’s no longer needed and prepares the aircraft for ground operations.

So the automatic action is depressurization to ambient pressure.