A320/21 - AIR CONDITIONING - MAIN COMPONENTS

The two packs operate automatically and independently of each other. Pack operation is controlled by signals coming from the ... pack controller or the Air Conditioning System Controller (ACSC). CPC (cabin pressure controller).

PACK FLOW CONTROL VALVE This VALVE is pneumatically-operated and electrically-controlled. It regulates the air flow in accordance with signals received from the pack controllers or the ACSC. In the absence of air pressure, a spring keeps the valve closed. Always remian open. In the absence of electrical power the valve closes.

PACK FLOW CONTROL VALVE The valve closes automatically in case of: - engine start, - pack overheat (on ground only) - operation of the fire or ditching pushbutton. - engine start, - pack overheat (on ground and inflght) - operation of the fire or ditching pushbutton. - engine start, - pack overheat (on ground only) - operation of the fire pushbutton.

EMERGENCY RAM AIR An emergency ram air inlet ventilates the cockpit and cabin to ... remove smoke, or if both packs fail. remove smoke only. remove smoke, or if one pack fails.

EMERGENCY RAM AIR When the RAM AIR pushbutton is ON : The outflow valve opens about 50 %, provided that it is under AUTOMATIC control and ΔP is LESS than 1 PSI. The outflow valve opens about 100 %, provided that it is under AUTOMATIC control and ΔP is LESS than 1 PSI. The outflow valve opens about 50 %, provided that it is under MANUAL control and ΔP is LESS than 2 PSI.

EMERGENCY RAM AIR The outflow valve does not automatically open if it is under _______ control, even if ΔP is ______ than 1 PSI. MANUAL - LESS. MANUAL - GRATER. AUTO - LESS.

MIXER UNIT This unit mixes cold fresh air from the packs with the cabin air being recirculated through recirculation fans. The mixer unit is also connected to the ... EMERGENCY RAM AIR inlet and the LOW PRESSURE ground inlets. EMERGENCY RAM AIR inlet only. LOW PRESSURE ground inlets..

HOT-AIR PRESSURE-REGULATING VALVE This valve regulates the pressure of hot air. It is pneumatically-operated and electrically-controlled from the HOT AIR pb-sw on the AIR COND panel. The ______ regulates this valve. In the absence of air, __________________________. ACSC 1 - a spring keeps the valve closed. ACSC 2 - a spring keeps the valve closed. ACSC 1 - electrically closed.

HOT-AIR PRESSURE-REGULATING VALVE The valve closes automatically, if: ‐ Both LANES of ACSC 1 or ACSC 2 fail, or ‐ Duct overheat, or ‐ At least 2 trim air valves fail. ‐ Both LANES of ACSC 2 fail, or ‐ Duct overheat, or ‐ At least 1 trim air valve fail. ‐ Both LANES of ACSC 1 or ACSC 2 fail, or ‐ Duct overheat, or ‐ At least 1 trim air valves fail.

TRIM AIR VALVES The cockpit trim air valve is controlled by the ______, and the cabin trim air valves are controlled by the _____. ______. ACSC 1 / ACSC 2. ACSC 2 / ACSC 1.

PACKS USE WITH LP AIR CONDITIONING UNIT (Limitation) The flight crew ... MUST NOT USE conditioned air from the packs and from the LP Air Conditioning Unit at the same time. CAN USE conditioned air from the packs and from the LP Air Conditioning Unit at the same time.

TEMPERATURE REGULATION A signal corresponding to the ________ demanded zone temperature goes to the pack controller or the ACSC, which then make both packs supply the required outlet temperature. LOWEST. HIGHEST.

TEMPERATURE REGULATION The zone controller or the ACSC optimizes temperature by acting on the trim air valves. The temperature selection range is from: 18 °C (64 °F) to 30 °C (86 °F). 22 °C (64 °F) to 30 °C (86 °F). 18 °C (64 °F) to 32 °C (86 °F).

AIR CONDITIONING SYSTEM CONTROLLERS Each air conditioning system controller regulates the temperature of its associated pack,. by modulating the bypass valve and the ram air inlet flap. by modulating the bypass valve. by modulating the zone control valve and the ram air inlet flap.

AIR CONDITIONING SYSTEM CONTROLLERS The ram air inlet flap ... closes during takeoff and landing to avoid the ingestion of foreign matter. opens during takeoff and landing to avoid the ingestion of foreign matter. closes during landing to avoid the ingestion of foreign matter.

AIR CONDITIONING SYSTEM CONTROLLERS RAM AIR inlet CLOSES: ON TAKE OFF: T/O POWER is set, and main LG struts are compressed. ON LANDING, main LG struts are compressed, and SPEED above 70 kt. It opens 20 s after the speed drops below 70 kt. ON TAKE OFF: T/O POWER is set, and main LG struts are compressed. ON LANDING, main LG struts are compressed, and SPEED above 90 kt. It opens 20 s after the speed drops below 70 kt. ON TAKE OFF: T/O POWER is set, and main LG struts are compressed. ON LANDING, main LG struts are compressed, and SPEED above 70 kt. It opens 20 s after the speed drops below 90 kt.

PACK FLOW CONTROL The flight crew can use the PACK FLOW selector to adjust the pack flow for the number of passengers and for external conditions. The system delivers NORM flow if the flight crew selects. LO flow and the temperature demand cannot be satisfied. HI flow and the temperature demand cannot be satisfied.

PACK FLOW CONTROL Whatever the crew selects, the system delivers HI flow for any of the following circumstances: ‐ In SINGLE-PACK operation, ‐ When APU supplying bleed air. ‐ When APU supplying bleed air. ‐ In TWO-PACK operation, ‐ When APU supplying bleed air.

PACK FLOW CONTROL ENGINE PRESSURE DEMAND When the cooling demand in one zone cannot be satisfied, if the bleed pressure is too low, the air conditioning system controller sends a pressure demand signal to both Engine Interface Units (EIU) to ... increase the minimum idle and to raise the bleed pressure. decrease the minimum idle and to raise the bleed pressure. increase the minimum idle and to lower the bleed pressure.

PACK FLOW CONTROL APU FLOW DEMAND When the APU bleed valve is open, the air conditioning system controller signals the APU's Electronic Control Box (ECB) to ... INCREASE the APU flow output when any zone temperature demand cannot be satisfied. DECREASE the APU flow output when any zone temperature demand cannot be satisfied.

AIR CONDITIONING - SYSTEM OPERATION UNDER FAILURE CONDITION AIR CONDITIONING SYSTEM CONTROLLERS (ACSC) Each controller (ACSC 1 and ACSC 2) is comprised of TWO LANES. ONE LANE FAILURE: No effect, as the second lane takes over. BOTH LANES FAILURE: ... The related PACK IS LOST and the HOT AIR PR valve CLOSES. The associated trim air valve(s) remain(s) in the CURRENT position at the time of the failure. The related PACK IS LOST and the HOT AIR PR valve CLOSES. The associated trim air valve(s) closes. The related PACK IS LOST and the HOT AIR PR valve OPENS. The associated trim air valve(s) remain(s) in the CURRENT position at the time of the failure.

AIR CONDITIONING - SYSTEM OPERATION UNDER FAILURE CONDITION AIR CYCLE MACHINE FAILURE If the Air Cycle Machine (ACM) fails, the affected pack may be operated in _________________________. Warm bleed air enters via the pack valve and goes to the primary heat exchanger. Then, the main part of the cooled air goes directly downstream of ACM turbine through the bypass valve, and the rest goes through the failed ACM. The ACM seizure reduces the pack flow. HEAT EXCHANGER COOLING MODE. STANDBY MODE. BACK UP PACK MODE.

AIR CONDITIONING - SYSTEM OPERATION UNDER FAILURE CONDITION HOT AIR PRESSURE REGULATING VALVE FAILURE FAILED OPEN: No effect. FAILED CLOSE: Optimized regulation is lost. Trim air valves CLOSE. Pack 1 CONTROLS COCKPIT TEMP and Pack 2 CONTROLS CABIN TEMP (FWD and AFT) to the MEAN value of the selected temp. Optimized regulation is lost. Trim air valves OPEN. Pack 1 CONTROLS COCKPIT TEMP and Pack 2 CONTROLS CABIN TEMP (FWD and AFT) to the MEAN value of the selected temp. Optimized regulation is lost. Trim air valves CLOSE. Pack 1 CONTROLS CABIN TEMP and Pack 2 CONTROLS COCKPIT TEMP(FWD and AFT) to the MEAN value of the selected temp.

AIR CONDITIONING - SYSTEM OPERATION UNDER FAILURE CONDITION TRIM AIR VALVE FAILURE. Optimized temperature regulation of the corresponding zone is lost. All temp zone control is lost. Temperature regulation of the corresponding pack is lost.