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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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07/30/24

Message Overview:

BATT BUS FAIL
(Caution)

DDG Reference: No Go
Pilot Action (QRH): ABNORM 6-4
System Description: 24-61-00
System Schematic 24-61-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 24-61-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Message Description:

Two conditions:

  1. BATT BUS is not powered
  2. BATT BUS is isolated by the Primary Logic Cards (PLCs) due to BUS fault detection.

Possible Causes:

  • DC Power Center (DCPC) Contactor K3
  • DC Power Center (DCPC) Electronic Module 4 (EM4)
  • DC Power Center (DCPC) Secondary-Power Distribution Assembly (SPDA) Feeder Assembly BATT BUS Card
  • DC Power Center (DCPC) (A63)
  • DCPC contactor K5 (ETC)

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

A K5 (ETC) failure will only show itself when at least one TRU is failed

Quick Links:

Standard Aircraft Configuration for Maintenance [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM12-00-00-867-801
Electrical/Electronic Safety Precautions [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-00-00-910-801
Electrostatic Discharge Safety Precautions [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-00-00-910-802
Removal of the DC Power Center (DCPC) [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-61-00-000-801
Installation of the DC Power Center (DCPC) [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-61-00-400-801
Operational Test of the DC Power Center (DCPC) [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-61-00-710-801
Removal of the DC Power Center (DCPC) Secondary-Power Distribution Assembly (SPDA) Feeder [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-61-37-000-801
Installation of the DC Power Center (DCPC) Secondary-Power Distribution Assembly (SPDA) Feeder [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-61-37-400-801
Operational Test of the DC Power Center (DCPC) Secondary-Power Distribution Assembly (SPDA) Feeder [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-61-37-710-801
Removal of the DC Power Center (DCPC) Electronic Modules [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-61-65-000-801
Installation of the DC Power Center (DCPC) Electronic Modules [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-61-65-400-801
Operational Test of the DC Power Center (DCPC) Electronic Modules [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-61-65-710-801
CAIMS PMAT General Instructions [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM45-45-00-970-801
Access to Active Faults [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM45-45-00-970-802
Access to Stored Faults [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM45-45-00-970-803

Troubleshooting Recommendations:

  1. Does this failure only occur when a TRU is failed or off?

    1. If YES, continue with next step.
    2. If NO, go to step 3.

  2. Access DCPC contactor assembly. Do a voltage check for 28 VDC as follows:

    From

    To

    Result

    K5-B1

    Ground

     

    K5-B2

    Ground

    1. If there is no 28 VDC, replace K5.
    2. If there is 28 VDC, go to step 5.

  3. Access DCPC contactor assembly. Power on the A/C and make sure ESS TRU 2 is powered. Do a voltage check for 28 VDC as follows:

    From

    To

    Result

    K3-A1

    Ground

    1. If there is 28 VDC, continue with next step.
    2. If there is no 28 VDC, troubleshoot the wiring between ESS TRU 2 and the DCPC.

  4. Remove electrical power from the aircraft.
  5. Do a voltage check for 28 VDC as follows:

    From

    To

    Result

    K3-A2

    Ground

    1. If there is voltage, continue with next step.
    2. If there is no 28 VDC, replace K3.

  6. Disconnect EM4 connector P407. Do a continuity check as follows:

    From

    To

    Result

    P407-12

    Ground

     

    P407-15

    Ground

    1. If there is continuity, replace DCPC.
    2. If there is no continuity, continue with next step.

  7. Do a continuity check as follows:

    From

    To

    Result

    P407-12

    K3-A2

     

    P407-15

    K3-A2

    1. If there is continuity, continue with next step.
    2. If there is no continuity, replace DCPC.

  8. Remove the BATT SPDA FEEDER CARD. Do a continuity check as follows:

    From

    To

    Result

    P407-13

    Ground

     

    P407-16

    Ground

     

    P407-11

    Ground

    1. If there is continuity, replace DCPC.
    2. If there is no continuity, continue with next step.

  9. Do a continuity check as follows:

    From

    To

    Result

    P431A-8

    P407-13

     

    P431A-9

    P407-16

     

    P431A-10

    P407-11

    1. If there is continuity, continue with next step.
    2. If there is no continuity, replace DCPC.

  10. Swap the BATT SPDA FEEDER with DC BUS 2 SPDA FEEDER Card. Does the fault follow the card?

    1. If YES, replace defective SPDA FEEDER Card.
    2. If NO, replace EM4.

  11. Do close out.

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