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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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04/13/23

Message Overview:

Message Name:

FUSE BLOWN

Message Code:

B3-007015

Associated CAS:

L AUX BUS FAIL
(Advisory)

Reported LRU: L AUX/MN BUS FUSE
System Description: 24-61-00
Schematic Diagram: 24-61-00
Wiring Diagram: 24-61-01

Message Description:

The Left Auxiliary/Main Fuse (LAXF1) connecting the Left Main Bus to the Left Auxiliary Bus, located in the Left DCPC, has blown.

Possible Causes:

  • Left Auxiliary/Main Fuse (LAXF1) (F5)
  • Left DC Power-Center Protection (LPROT) (PCB1)
  • Left DC Power Center (L DCPC) (A35)
  • 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
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02
Electrical Connectors - Maintenance Practice - ALL SPM 20-20-00-02

Troubleshooting Recommendations:

  1. Disconnect both batteries and the External DC power.
  2. Inspect Left DCPC (A35), external and internal, for any signs of burning and 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 Left Auxiliary/Main Fuse (F5) located in the Left DCPC (A35). Is the Fuse good?

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

  4. Replace the Left Auxiliary/Main Fuse (F5). Is the fault message still present?

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

  5. Swap the Left DC Power-Center Protection (PCB1) with the Right DC Power-Center Protection (PCB2). 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 Left DCPC (A35).
  7. Do close out.

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