What type of engine does the A/S32A-31A tractor utilize?

The A/S32A-31A tractor is powered by a 3 cylinder, 2 cycle diesel engine. This type of engine configuration is often used in vehicles that require a compact, yet effective power plant, particularly in applications such as towing and moving aircraft on the flight line. The 2 cycle engine design allows for a higher power-to-weight ratio, making it suitable for heavy-duty tasks like those performed by the A/S32A-31A. The relatively simple design of a 3 cylinder engine contributes to reliability and ease of maintenance, which are critical traits in military equipment.

The other options describe engine types that do not accurately match the specifications of the A/S32A-31A tractor.