Which is NOT a DC Bus?

Which is NOT a DC Bus?

• A. DC Utility Bus
• B. DC Main Battery Direct Bus
• C. DC Essential Bus
• D. DC Toilet Bus

Answer: (D)

DC buses are power paths organized by function and criticality in the aircraft electrical system. The CRJ-550 has a DC Essential Bus for flight-critical systems, a DC Utility Bus for non-critical loads, and a DC Main Battery Direct Bus that provides a direct feed from the main battery for essential operations when generators aren’t available. There isn’t a separate DC bus designated for a toilet system in this architecture. The power for the toilet would come from one of the general DC buses rather than from its own dedicated DC bus. So, a “DC Toilet Bus” isn’t part of the CRJ-550 DC bus layout, making it the correct choice as not being a DC bus.

DC buses are power paths organized by function and criticality in the aircraft electrical system. The CRJ-550 has a DC Essential Bus for flight-critical systems, a DC Utility Bus for non-critical loads, and a DC Main Battery Direct Bus that provides a direct feed from the main battery for essential operations when generators aren’t available. There isn’t a separate DC bus designated for a toilet system in this architecture. The power for the toilet would come from one of the general DC buses rather than from its own dedicated DC bus. So, a “DC Toilet Bus” isn’t part of the CRJ-550 DC bus layout, making it the correct choice as not being a DC bus.