Which of the following is NOT a function of the Advanced Environmental Control Systems?

• A. Cabin Pressure
• B. Ventilation
• C. Temperature
• D. Humidity Control

Answer: (D)

The Advanced Environmental Control System is built to manage three main aspects of the cabin environment: maintaining cabin pressure, providing conditioned air through ventilation, and regulating temperature. Humidity control, while related to the overall comfort of the cabin, is not a standard, active function of this system. The ECS adjusts the amount of bleed air, air conditioning packs, and mix of hot and cold air to keep the cabin at a comfortable temperature and at the proper pressure, but it does not actively set or regulate moisture levels in the cabin. Humidity can be influenced indirectly by overall air processing, but there isn’t a dedicated humidity control function within the Advanced ECS, which is why humidity control is the option that does not fit.