What type of engine is commonly used in the Warrior PA-28A?

The Lycoming O-360 engine is commonly used in the Warrior PA-28A because it is a reliable and efficient four-cylinder, horizontally opposed engine that delivers the necessary power for this particular aircraft model. With a specification of producing approximately 180 horsepower, it provides an adequate performance for the aircraft's capabilities in terms of speed, climb rate, and overall handling.

This engine is well-known for its durability and relatively low maintenance requirements, which are significant advantages for both private pilots and flight schools. The O-360's design allows for smooth operation, contributing to greater pilot control and comfort during flight.

In contrast, the other options listed refer to different engines or specifications that do not match the standard configuration for the PA-28A Warrior. The Continental IO-550 is a larger and more powerful engine, typically found in larger aircraft models. The Textron Lycoming IO-360 is indeed a variant of similar design but is not the specific engine used in the Warrior. The Piper PA-28-161 refers to a specific configuration of the PA-28 aircraft series and does not directly relate to the engine question.