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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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09/21/20

Message Overview:

Fault Message:

ACPC RS422 RECEIVE (GCU1) FAULT

Fault Code:

2421176LPS

Associated CAS:

ELEC SYS FAULT
(Advisory)

Reporting LRU: AC Power Center (ACPC)
System Description: 24-21-00
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) senses a RS422 communication failure from the Generator Control Unit (GCU) 1.

Possible Causes:

  • AC Power Center (ACPC) (A54)
  • AC Power Center (ACPC) Primary Logic Card 3
  • Generator Control Unit (GCU) 1 (A56)
  • 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 ]
AC Power Center Component Maintenance Manual CMM 24-51-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

CAUTION: To prevent damage to the ACPC Mother Board connectors, ensure that the jumper wire pins outside diameter (OD) does not exceed 0.025 inch.

  1. Swap GCU 1 with GCU 2.

    1. If system checks are good, replace GCU 1 and do close out.
    2. If fault remains, continue with next step.

  2. Swap ACPC Primary Logic cards #3 with ACPC Primary Logic cards #2.

    1. If system checks are good, replace ACPC Primary Logic cards #3 and do close out.
    2. If fault remains, continue with next step.

  3. Perform wiring check between GCU#1, ACPC and P101.

    1. If system checks are good, repair wiring as required and do close out.
    2. If fault remains, continue with next step.
      NOTE: Disconnect GCU#1 connector and remove ACPC PLC#3 to measure for short/open circuit.

  4. Replace ACPC.
  5. Do close out.

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