The Flight Data Recorder is energized by which electrical power source?

The Flight Data Recorder is energized by which electrical power source?

• A. DC Bus 1
• B. DC Bus 2
• C. Battery
• D. Generator

Answer: (A)

The Flight Data Recorder is powered from DC Bus 1. This bus is the primary 28V DC supply for essential avionics and systems, so the FDR stays energized under normal operations as long as DC Bus 1 is powered. In a typical CRJ-550 electrical layout, engine-driven generators feed DC Bus 1 to keep it alive, while other buses (like DC Bus 2) handle different equipment and the battery serves as backup for certain situations. Because of this arrangement, the FDR’s direct power source is DC Bus 1, not DC Bus 2, the battery, or the generator as a standalone source.

The Flight Data Recorder is powered from DC Bus 1. This bus is the primary 28V DC supply for essential avionics and systems, so the FDR stays energized under normal operations as long as DC Bus 1 is powered. In a typical CRJ-550 electrical layout, engine-driven generators feed DC Bus 1 to keep it alive, while other buses (like DC Bus 2) handle different equipment and the battery serves as backup for certain situations. Because of this arrangement, the FDR’s direct power source is DC Bus 1, not DC Bus 2, the battery, or the generator as a standalone source.