Which Electrical Bus powers the Fire Detection, DISCH 2?

The correct answer identifies that Fire Detection systems, including DISCH 2, are powered by Hot Battery Bus #2. This bus is designed to maintain power to essential systems even when other power sources are not available or are switched off.

Hot Battery Bus #2 specifically provides a continuous power supply for critical safety features such as fire detection, ensuring they remain operational regardless of the aircraft's overall electrical status. This redundancy is crucial for safety during flight operations, particularly during emergencies when aircraft systems must function independently of the main power sources.

Main Battery Bus, on the other hand, typically supplies power to the general electrical systems of the aircraft, while AC Power Bus is used primarily for systems that operate on alternating current, which may not cover specific battery-required systems like fire detection. Hot Battery Bus #1, while also a critical power source, does not serve the same function as Hot Battery Bus #2 when it comes to the fire detection systems.

Understanding the specific roles of these electrical busses is essential for ensuring all critical systems, such as fire detection, are operational when needed.