Which engines are used in the Chinook helicopter?

The Chinook helicopter is equipped with two Avro Lycoming T55 turboshaft engines, specifically designed for heavy-lift operations and high-performance flight. This configuration provides the necessary power and reliability required for the aircraft’s demanding operational roles, including troop transport, cargo lift, and medical evacuation. The T55 engines enable the Chinook to perform in various environments, thanks to their robust design and efficiency.

The other options do not accurately represent the engine type used in the Chinook, which is pivotal for understanding the helicopter's capabilities and operational characteristics.