What is contained in the Integrated Avionics Unit of a Cessna 172?

The Integrated Avionics Unit of a Cessna 172 is primarily responsible for flight data processing systems. This unit collects and processes various flight parameters, which include altitude, speed, and heading, to present them on the cockpit displays. The integration allows for enhanced situational awareness and the efficient management of flight data, which is critical for pilot decision-making during flight.

While the other systems mentioned are vital to the functioning of the aircraft, they do not fall under the primary functions of the Integrated Avionics Unit. Fuel management systems focus on fuel levels and distribution, electrical distribution systems handle power management to various aircraft components, and navigation control systems involve pilot inputs and inertial navigation that are more about navigation rather than data processing. Thus, the key distinction of the Integrated Avionics Unit is its role in effectively processing and displaying flight data, making the identification of flight data processing systems as the correct answer.