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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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Quick Links

09/21/20

Message Overview:

Fault Message:

ACPC RS422 RECEIVE (GCU2) FAULT

Fault Code:

2422176LPS

Associated CAS:

GEN 2 FAIL
(Advisory)

Reporting LRU: AC Power Center (ACPC)
System Description: 24-21-00
Schematic Diagram: 24-21-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 24-21-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

AC Power Center (ACPC) sense a RS422 communication failure from the Generator Control Unit (GCU) 2.

Possible Causes:

  • Generator Control Unit (GCU) 2 (A57)
  • AC Power Center (ACPC) (A54)
  • AC Power Center (ACPC) External AC-to-DC Converter
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

A GCU patch cable (GSE REF # 24X-24-02) can be used to swap GCUs 1, 4 and 5 into position 2 or 3 (for troubleshooting only).

The GCU NVMs can only be downloaded at position 2 or 3.

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) External AC-to-DC Converter AMM 24-51-17-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the AC Power Center (ACPC) External AC-to-DC Converter AMM 24-51-17-400-801 [ 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 2 with GCU 3 (physically or using the GCU patch cable).
    NOTE: Use PMAT to monitor the fault on GCU.

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

  2. Perform wiring checks between GCU 2, ACPC and P201.

    1. If wiring checks are not good, repair the defective wiring and do close out.
    2. If wiring checks are good, continue with next step.
      NOTE: Disconnect GCU 2 connector and remove ACPC External AC-to-DC Converter to measure for short/open circuit.

  3. Replace External AC-to-DC Converter.

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

  4. Replace ACPC.
  5. Do close out.

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