Which statement about the dual loop fire detection system is true?

The dual loop fire detection system is specifically designed to enhance reliability and safety in detecting fires. Each loop functions independently, which is key to the system's effectiveness. This redundancy means that if one loop detects a fire, the other loop can still function and provide an additional layer of detection. This design ensures that fire detection remains operational even if one of the loops experiences a failure. Therefore, both loops have the capability to independently detect fire, making this statement accurate and highlighting the robustness of the fire detection system in the Canadair Regional Jet.

In the context of the other options, the idea that fire cannot be detected if one loop fails is incorrect, as the dual loop design deliberately addresses this concern. The statement about only monitoring the APU loop does not capture the full function of the system, which is capable of monitoring multiple areas, including both engines. Finally, the assertion that this system is only used for the engines is also misleading, as fire detection systems can be implemented in various locations on the aircraft, not limited solely to engines. Thus, the focus on independent detection capabilities illustrates the fundamental strength of the dual loop design.