What ECS system is responsible for providing air conditioning, heat, and defog?

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The system responsible for providing air conditioning, heat, and defog in the TH-73 is the lower environmental control system (ECS). This system is designed to maintain a comfortable and safe cockpit environment for the crew and passengers by regulating the temperature and visibility conditions.

The lower ECS handles temperature control and airflow management effectively, ensuring that the aircraft operates efficiently within its environmental requirements. This includes addressing the need for heating during colder conditions and cooling during warmer conditions, as well as providing defogging capabilities to maintain clear visibility through the helicopter's windows. The upper ECS does not encompass these functions, which is why the focus on the lower ECS for these specific roles is key to maintaining optimal flight conditions.