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(WARNING)
RED MESSAGE (CAUTION)
AMBER MESSAGE (ADVISORY)
CYAN MESSAGE (STATUS)
WHITE MESSAGE Require immediate crew attention. These messages are accompanied by flashing master warning, triple chime attenson with or without voice message or dedicated tone. Require immediate crew awareness and future crew action may be required in the form of alternate system selection or performance limitation. These message are accompanied by flashing master caution and a single chime. Indicate safe or normal system operation which require crew awareness, over and above the dark cockpit philosophy. Indicate minor failures or reduction in systems capability, which require no crew action.

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02/25/21

Message Overview:

Message Name:

FUSE BLOWN

Message Code:

B3-007680

Associated CAS:

R AUX BUS FAIL
(Advisory)

Reported LRU: R AUX/MN BUS FUSE
System Description: 24-61-00
Schematic Diagram: 24-61-00
Wiring Diagram: 24-61-03

Message Description:

The Right Auxiliary/Main Fuse (RAXF1) connecting the Right Main Bus to the Right Auxiliary Bus, located in the Right DCPC, has opened.

Possible Causes:

  • Right Auxiliary/Main Fuse (RAXF1) (F6)
  • Right DC Power-Center Protection (RPROT) (PCB2)
  • Right DC Power Center (R DCPC) (A36)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Power Center (DCPC) AMM 24-61-01-000-801
Installation of the Power Center (DCPC) AMM 24-61-01-400-801
Removal of the DC Power-Center Protection AMM 24-61-77-000-801
Installation of the DC Power-Center Protection AMM 24-61-77-400-801
Removal of the DC Power-Center Fuses AMM 24-61-79-000-801
Installation of the DC Power-Center Fuses AMM 24-61-79-400-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Disconnect both batteries and the External DC power.
  2. Inspect the Right DCPC (A36), external and internal, for any signs of burning and for the presence of any foreign object that could have caused a short circuit.

    1. If inspection is okay, continue with next step.
    2. If inspection is not okay, go to step 6.

  3. Remove, inspect and measure the Right Auxiliary/Main Fuse (F6) located in the Right DCPC (A36). Is the fuse good?

    1. If YES, go to step 5.
    2. If NO, continue with next step.

  4. Replace the Right Auxiliary/Main Fuse (F6). Is the fault message still present?

    1. If YES, continue with next step.
    2. If NO, do close out.

  5. Swap the Right DC Power-Center Protection (PCB2) with the Left DC Power-Center Protection (PCB1). Is the fault message still present?

    1. If YES, continue with next step.
    2. If NO, replace the defective DC Power-Center Protection.

  6. Replace the Right DCPC (A36).
  7. Do close out.

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