Which component controls the auxiliary cabin heat?

The component that controls the auxiliary cabin heat is the Environmental Control System. This system is specifically designed to manage the conditions within the cabin, which includes heating, cooling, and ventilation. The auxiliary cabin heat function is an essential aspect of maintaining a comfortable environment for passengers and crew, especially during colder weather conditions or when the aircraft is on the ground.

By utilizing the Environmental Control System, the aircraft can efficiently regulate the temperature and ensure adequate heating when necessary. This is particularly important in Part 135 operations, where passenger comfort and safety are a priority. In contrast, the other systems listed, such as the Flap Control Unit, Fuel Management System, and Flight Control System, serve different functions unrelated to cabin temperature regulation; therefore, they do not play a role in controlling auxiliary cabin heat.