Which unit do the dual detection loops in the APU enclosure connect to?

The dual detection loops in the APU (Auxiliary Power Unit) enclosure are primarily designed for fire detection and monitoring. The correct answer reflects the specific purpose of these detection loops, which work to identify potential fire hazards within the APU enclosure. When a fire is detected, these loops send signals to the fire detection and extinguishing control unit, allowing for an appropriate response to ensure safety.

The fire detection and extinguishing control unit is responsible for processing information from the detection loops, managing fire suppression systems, and providing alerts to the crew or control systems. This interaction is crucial for maintaining the operational integrity and safety of the aircraft.

Other units, such as the engine control unit, fuel management system, and electrical power distribution unit, do not serve the primary function of fire detection. While they play critical roles in the overall operation of the aircraft, they are not directly connected to the smoke and fire detection mechanisms that the dual detection loops focus on.