Cargo Conditioning Overview PDF

Overview of Cargo Conditioning ​ The forward and aft cargo compartments are fully automated in terms of air conditioning and heating. ​ System Design: ○​ Ambient air from the cabin enters the compartment via an inlet isolation valve. ○​ Air is removed via: ​...

Overview of Cargo Conditioning ​ The forward and aft cargo compartments are fully automated in terms of air conditioning and heating. ​ System Design: ○​ Ambient air from the cabin enters the compartment via an inlet isolation valve. ○​ Air is removed via: ​ An extraction fan (on the ground or at low differential pressures). ​ Differential pressure during flight. ○​ Discharged overboard through an outlet isolation valve. ​ Control:​ The Cargo Ventilation Controller automatically manages the valves and extraction fan. Forward Cargo Compartment 1.​ Ventilation System: ○​ Extraction Fan: Operates when: ​ On the ground. ​ Differential pressure is less than 1 PSI. ○​ Air is extracted through isolation valves and discharged overboard. 2.​ Heating System (if installed): ○​ Hot bleed air is supplied via a trim air valve. ○​ Controller: ​ Monitors duct inlet and zone temperatures. ​ Adjusts the trim air valve to regulate heating. ○​ Limitations:​ Heating is unavailable when: ​ The forward cargo door is open. ​ The hot air valve is closed. Aft Cargo Compartment 1.​ Ventilation System: ○​ Similar to the forward compartment. ○​ Extraction Fan: Runs continuously as long as the isolation valves are open. 2.​ Heating System (if installed): ○​ Hot bleed air is supplied via a cargo pressure regulating valve to the trim air valve. ○​ Controller: ​ Regulates temperature by controlling the trim air valve.  ​ Monitors duct inlet and zone temperatures. ○​ Limitations:​ Heating is unavailable when: ​ The aft cargo door is open. ​ The cargo pressure regulating valve is closed. Pilot Monitoring and Controls 1.​ ECAM Cond Page: ○​ Displays the following indications for each cargo compartment: ​ Inlet/Outlet Isolation Valves ​ Trim Air Valve ​ Duct Inlet Temperature ​ Zone Temperature ​ Hot Air Valve ○​ Note: There are no indications for extraction fans. 2.​ Overhead Panel - Cargo Heat Panel: ○​ Controls cargo heating and ventilation systems (if installed). ○​ Contains: ​ Isolation Valve Push Button Switches: Normally in lights out (Auto) position, allowing automatic control by the Cargo Ventilation Controller. ​ Temperature Selectors: Send demand signals to the heating controllers to adjust compartment temperature. ​ Hot Air Push Button Switch: Controls the aft cargo pressure regulating valve. Operation Summary 1.​ Normal Operation: ○​ Push button switches remain in their default lights out (Auto) position. ○​ Set the required temperatures using the temperature selectors. ○​ Temperature Selector Reference: Mid-position corresponds to approximately 15°C. 2.​ System Automation: ○​ The system autonomously manages ventilation and heating based on input and environmental conditions. ○​ Requires minimal pilot input.