Which of the air conditioning system controllers controls the cabin zone temperatures?

Which of the air conditioning system controllers controls the cabin zone temperatures?

• A. Air conditioning system controller #1
• B. Air conditioning system controller #2
• C. Air conditioning system controller #3
• D. Air conditioning system controller #4

Answer: (B)

The cabin zone temperature is controlled by the second air conditioning system controller. In the Airbus A320 environmental control system, four controllers handle different aspects of the ECS, but the task of processing the zone temperature setpoints (from the cabin zone controls and the pilots’ panel) and driving the mix of conditioned air to achieve the desired zone temperatures is assigned to that second controller. It compares the actual zone temperatures from sensors with the setpoints and adjusts outputs to the packs, valves, and distribution to reach and maintain the target. The other controllers manage other functions—such as pack operation, bleed management, and safety interlocks—and do not directly regulate cabin zone temperatures. This dedicated role for the second controller explains why it’s the one responsible for cabin zone temperature control.

The cabin zone temperature is controlled by the second air conditioning system controller. In the Airbus A320 environmental control system, four controllers handle different aspects of the ECS, but the task of processing the zone temperature setpoints (from the cabin zone controls and the pilots’ panel) and driving the mix of conditioned air to achieve the desired zone temperatures is assigned to that second controller. It compares the actual zone temperatures from sensors with the setpoints and adjusts outputs to the packs, valves, and distribution to reach and maintain the target. The other controllers manage other functions—such as pack operation, bleed management, and safety interlocks—and do not directly regulate cabin zone temperatures. This dedicated role for the second controller explains why it’s the one responsible for cabin zone temperature control.