HOW IS THE TEMPERATURE CONTROLLED IN THE CABIN OF THE AIRCRAFT AIR CONDITIONING SYSTEM (M2): HOW COLD AIR IS PRODUCED BY THE AIR CYCLE MACHINE The mode Normal is based on the unit temperature request, which corresponds to the lowest zone temperature request from the zone controller. The unit controller sets the unit temperature demand to 20°C by default, that is, if there is no demand signal sent from the zone controller. The limited package temperature demand is then compared to the actual temperature measured by:• the package temperature sensor (8),• the package exhaust temperature sensor (10). The Pack Controller is responsible for controlling the three valves to meet the desired cabin temperature requested by the zone controller:1. Piston air inlet door 2. Piston air outlet door 3. Temperature control valveThe following sensors are used for regulating the temperature output of this air cycle machine:Sensors 1-3: measure the actual airflow through the flow control valve in the ACMSensors 4-6: measure the air temperature through the compressor sensors 6-7: measure the efficiency of the heat exchanger with the use of cooling Ram AirCOLD AIR FROM THE AIR CYCLE MACHINEHOW THE TEMPERATURE IS ADJUSTED BY THE AIR CYCLE MACHINE ENTERING THE CABINPRV 1 and 2 hot air trim air supplies with pressure regulation at the various trim air valves for a precise temperature regulation. The two trim air systems can be connected to each other via the trim air shut-off valve mounted on the hot air manifold. Each trim air PRV has a hot air pressure regulation function and a hot air cutoff function. The ZONE CONTROLLER receives feedback from the cockpit and cabin zone temperature request based on crew input on temperature selection......paper center......selected in MANUAL position. In this position, electrical power is removed from the controller (and subsequently from the rise and dip solenoids associated with the primary outflow valve). All outflow valve changes are now controlled using differential pressure from the cabin and environmental sources. Placing the MANUAL valve in the UP position will increase the cabin altitude, while placing the valve in the DOWN position will reduce the cabin altitude. The amount of cabin altitude change and the rate of cabin altitude change are controlled by the amount of time the MANUAL valve is held in the UP or DOWN position. Since the manual valve uses cabin pressure to open and close the outflow valves, reaction time will increase with a low Delta-P in the cabin. Safety features in the manual toggle valve will not allow speed selections beyond Delta-P limits. Works CitedAirbus training manual