What type of trim system is incorporated in the Cessna 172?

The Cessna 172 utilizes an electric elevator trim system, which allows for easier and more precise adjustments during flight. This system provides pilots with the ability to maintain the desired pitch attitude with minimal physical effort, enhancing comfort and reducing fatigue during longer flights.

The electric trim system operates through the use of a small electric motor that adjusts the position of the elevator trim tab, allowing for fine-tuning of the aircraft's pitch without requiring continuous control input from the yoke. This feature is particularly beneficial in a training and general aviation aircraft like the Cessna 172, where ease of operation is crucial for novice pilots.

The alternatives present different trim system mechanisms that are not used in the Cessna 172. A manual trim system would require physical input for adjustments, which is less convenient for pilots, particularly during long flights. A hydraulic trim system is typically found in larger or more complex aircraft where hydraulic systems manage various flight controls, making it unsuitable for the Cessna 172. A mechanical trim system, while similar to manual trim, would still not provide the efficiencies and ease associated with an electric system. This distinction is essential for understanding the trim capabilities and operational design of the Cessna 172.