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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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06/28/19

Message Overview:

Fault Message:

ACPC PRIMARY LOGIC CARD #3-A21/GCU1

Fault Code:

2453003ACP

Associated CAS:

ELEC SYS FAULT
(Advisory)

Reporting LRU: AC Power Center (ACPC)
System Description: 24-23-00
Schematic Diagram: 24-21-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 24-21-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

AC Power Center (ACPC) Primary Logic Card (PLC) 3 has detected an RS422 transmission failure with Generator Control Unit (GCU) 1 during loop back test. Even though it can no longer communicate with the ACPC through the RS422 bus, the GCU remains operational.

Possible Causes:

  • Generator Control Unit (GCU) 1 (A56)
  • AC Power Center (ACPC) (A54)
  • AC Power Center (ACPC) Primary Logic Card (PLC) 3
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Generator Control Units (GCU) AMM 24-24-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Generator Control Units (GCU) AMM 24-24-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the AC Power Center (ACPC) AMM 24-51-00-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the AC Power Center (ACPC) AMM 24-51-00-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the AC Power Center (ACPC) Primary Logic AMM 24-51-09-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the AC Power Center (ACPC) Primary Logic AMM 24-51-09-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Swap GCU 1 with GCU 2, 3, 4 or APU GCU. Is the fault resolved?

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

  2. Access ACPC logic assembly. Swap PLC 3 with PLC 1. Is the fault still present?

    1. If NO, replace PLC 3 and do close out.
    2. If YES, continue with next step.

  3. Disconnect GCU 1 connector A56P2. Remove PLC 3. Perform a continuity check as follows:

    From To Result
    A56P2-9 Ground
    A56P2-15 Ground

    1. If there is continuity, go to step 5.
    2. If there is no continuity, continue with next step.

  4. Perform a continuity check as follows:

    From To Result
    A56P2-9 P415B-44
    A56P2-15 P415B-45

    1. If there is continuity, replace PLC 3 and do close out.
    2. If there is no continuity, go to step 6.

  5. Disconnect ACPC connector A54P6. Perform a continuity check as follows:

    From To Result
    A56P2-9 Ground
    A56P2-15 Ground

    1. If there is continuity, repair defective wiring as required and do close out.
    2. If there is no continuity, go to step 7.

  6. Disconnect ACPC connector A54P6. Perform a continuity check as follows:

    From To Result
    A56P2-9 A54P6-a
    A56P2-15 A54P6-b

    1. If there is no continuity, repair defective wiring as required and do close out.
    2. If there is continuity, continue with next step.

  7. Replace ACPC.
  8. Do close out.

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