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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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Quick Links

12/12/25

Message Overview:https://sfp.aero.bombardier.net/typo3/clear.gif

Message Name:

ACPC AC 2 FEEDER CONTACTOR-K18 FAIL

Message Code:

2451352ACP

Associated CAS:

ELEC SYS FAIL
Caution

Reporting LRU: AC Power Center (ACPC)
System Description: 24-50-00 - AC Electrical Load Distribution
Schematic Diagram: [ Global Express ]  [ G5000 ]  [ Global XRS ] 24-51-00 - AC Load Distribution AC Power Center(ACPC) System
Wiring Diagram: [ Global Express ]  [ G5000 ]  [ Global XRS ] 24-51-01  - Primary AC Power Distribution System

Message Description:

Secondary Logic Card 2 (SLC 2) detects a discrepancy between the coil drive status and auxiliary contact status of the Contactor K18.

Possible Causes:

  • Contactor (K18)
  • Secondary Logic Card (SLC) 2
  • Electronic Module 1 (EM1)
  • AC Power Center (ACPC) Mother Board
  • Electromagnetic Interference (EMI) Filter
  • AC Power Center (ACPC) TB202
  • AC Power Center (ACPC) (A54)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Full Throttle Blog/Forum Articles/Infoservice/Newsletter: None

Flight Operation Notifications Manual (FONM): None

NOTES:

  • If AC BUS 2 FEEDER (K18) is tripped and is not resettable:

    • Check K18 output (A2/B2/C2) and make sure all the three phases are not shorted to ground.
    • Do resistance check between current transformer IS3A and com, IS3B and com and IS3C and com. Make sure the resistance values on each phase are approximate the same value.

Quick Links:

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) Secondary Logic AMM 24-51-13-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the AC Power Center (ACPC) Secondary Logic AMM 24-51-13-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the AC Power Center (ACPC) H-Series Contactor AMM 24-51-29-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the AC Power Center (ACPC) H-Series Contactor AMM 24-51-29-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the AC Power Center (ACPC) Electronic Modules AMM 24-51-81-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the AC Power Center (ACPC) Electronic Modules AMM 24-51-81-400-801 [ 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:

  1. Interchange the SLC 2 with SLC 1.

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

  2. Perform a voltage check as follows:

    From To Result
    K18-X1 Ground

    1. If there is no voltage and there are no CAIMS messages related to EM1 fuses (F1, F2, F3 and F4), continue with next step.
    2. If there is no voltage and there is CAIMS messages related to EM 1 Fuses (F1, F2, F3 and F4), troubleshoot these messages first.

  3. Check TB202-3 connection. Repair as required.

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

  4. Remove SLC 2 and disconnect K18 -X1, K18-X2, K18-Y1, K18-Y2, K18-11 and K18-12. Perform a continuity check as follows:

    From To Result
    K18-Y2 (lug) Ground
    K18-X2 (lug) Ground
    K18-12 (lug) Ground

    1. If there is continuity, go to step 9.
    2. If there is no continuity, continue with next step.

  5. Perform a continuity check as follows:

    From To Result
    K18-11 (lug) Ground

    1. If there is continuity, go to step 9.
    2. If there is no continuity, continue with next step.

  6. Check TB202-3 connection. Repair as required.

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

  7. Perform a continuity check as follows:

    From To Result
    K18-Y2 (lug) SLC 2 P211A-10
    K18-X2 (lug) SLC 2 P211A-11
    K18-12 (lug) SLC 2 P211C-19

    1. If there is no continuity, go to step 9.
    2. If there is continuity, continue with next step.

  8. Replace K18.

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

  9. Replace ACPC.
  10. Do close out.



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