background
x
loader
Troubleshooting
arrow By ATA By Message Color By Observed Faults By CAIMS By Tips

Select color for CAS message that you wish to troubleshoot

(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.

This page includes :

For AOG assistance contact:

CRC Montreal (YUL)
Quick Links

10/02/20

Message Overview:

Fault Message:

ACPC AC 4 FEEDER CONTACTOR-K25 FAIL

Fault Code:

2451355ACP

Associated CAS:

ELEC SYS FAIL
(Caution)

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

Fault Description:

Secondary Logic Card (SLC) 4 detects a discrepancy between the coil drive status and auxiliary contact status of K25 Contactor.

Possible Causes:

  • AC Power Center (ACPC) (A54)
  • AC Power Center (ACPC) TB402
  • AC Power Center (ACPC) Contactor (K25)
  • Secondary Logic Card (SLC) 4
  • Electronic Module 2 (EM2)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

NOTE: If AC BUS 4 FEEDER (K25) is tripped and is not resettable:

  1. Check K25 output (A2/B2/C2) and make sure all the three phases are not shorted to ground.
  2. Do a resistance check between current transformer IS7A and common, IS7B and common and IS7C and common. Make sure that the resistance value on each phase is approximately the same.

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 24-51-13-000-801 [ 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. Swap SLC 4 with SLC 3.

    1. If system checks are good, replace SLC 4 and do close out.
    2. If fault remains, continue with next step.

  2. Perform a voltage check as follows:

    From To Result
    K25-X1 Ground
    K25 -Y1 Ground

    1. If no voltage and there are no CAIMS messages related to EM2 fuses (F1, F2, F3 and F4), continue with next step.
    2. If no voltage and there is CAIMS messages related to EM2 Fuses (F1, F2, F3 and F4), troubleshoot these messages first, continue with next step.
    3. If there is 28 VDC, go to step 4.

  3. Verify voltage check on TB402-3.

    1. If system checks are good, continue with next step.
    2. If fault remains, repair defective wiring as required and do close out.

  4. Remove SLC 4 and disconnect K25-X1, K25-X2, K25-Y1, K25-Y2, K25-11 and K25-12.
  5. Perform a continuity check as follows:

    From To Result
    K25-11 (lug) Ground

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

  6. Perform a continuity check between the connections as follows:

    From To Result
    K25-Y2 (lug) Ground
    K25-X2 (lug) Ground
    K25-12 (lug) Ground

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

  7. Perform a continuity check between the connections as follows:

    From To Result
    K25-Y2 (lug) P411A-10
    K25-X2 (lug) P411A-11
    K25-12 (lug) P411C-19

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

  8. Replace contactor K25.

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

  9. Replace ACPC.
  10. Do close out.

Registered and/or unregistered trademarks of Bombardier Inc. or its subsidiaries. © 2015 Bombardier Inc. All rights reserved.