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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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06/22/21

Message Overview:

Message Name:

ACPC CONTACTOR TACK WELDING

Message Code: 240OBS002
Effectivity: All
System: AC Power Center (ACPC)
System Description: 24-21-00
Schematic Diagram: None
Wiring Diagram: 24-51-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Message Description:

AC Power Center (ACPC) detects Contactor at fault.

Possible Causes:

  • AC Power Center (ACPC) (A54)
  • Generator Control Unit (GCU) 1 (A56)
  • Generator Control Unit (GCU) 2 (A57)
  • Generator Control Unit (GCU) 3 (A58)
  • Generator Control Unit (GCU) 4 (A59)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter:

Quick Links:

Removal of the APU Generator AMM 24-22-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the APU Generator AMM 24-22-01-400-801 [ 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)
L-Series Contactors		 AMM 24-51-33-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the AC Power Center (ACPC)
L-Series Contactors		 AMM 24-51-33-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Functional Test of the AC Power Center (ACPC)
L-Series Contactors K2, K3 and K5		 AMM 24-51-33-720-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the AC Power Center (ACPC)
LC-Series Contactors (K4, K6, K9, K12)		 AMM 24-51-37-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the AC Power Center (ACPC)
LC-Series Contactors (K4, K6, K9, K12)		 AMM 24-51-37-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Functional Test of the AC Power Center (ACPC)
LC-Series Contactors (K4, K6, K9, K12)		 AMM 24-51-37-720-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

NOTE: During any generator switching, all the ACMPs (hydraulic pumps) should be turned off.

  1. When CAS messages, CAIMS, synoptic page, or NVM download error code analysis, indicate that contactor P/N 5911740-1, at contactor positions K4, K6, K9, K12, or P/N 5911739-1 at contactor positions K2, K3, K5, K7, K8, K10, K11, K13, may be at fault, it is possible to restore these contactors full functionally by performing the generator switching sequence.
  2. Power down and up the aircraft.
  3. Ensure that both engines are running, the BMS (Bleed Management System) is on and all ACMPs are off (including AC pump 3A).

    1. If one or more conditions are not satisfied, apply condition as required and continue with next step.
    2. If all conditions are satisfied, continue with next step.

  4. Check for CAS messages, CAIMS, synoptic page, or NVM download error code analysis, indicate that contactor P/N 5911740-1, at contactor positions K4, K6, K9, K12, or P/N 5911739-1 at contactor positions K2, K3, K5, K7, K8, K10, K11, K13.

    1. If contactor K6 or K10 has fault, go to step 9.
    2. If contactor K9 or K7 has fault, go to step 13.
    3. If contactor K12 or K5 has fault, go to step 17.
    4. If contactor K11 or K2 has fault, go to step 21.
    5. If contactor K3 or K8 has fault, go to step 25.
    6. If contactor K4 or K13 has fault, continue with next step.

  5. For contactor K4 or K13 fault, on the ELECTRICAL Control Panel set the GEN 2 and GEN 3 PBAs to "ON".
  6. Verify that AC Electrical Synoptic page shows all the AC busses powered, that the AC Bus 1 is powered from GEN 3 and AC Bus 4 from GEN 2.

    1. If wiring checks are not good, repair defective wiring as required and do close out.
    2. If wiring checks are good, continue with next step.

  7. Set the GEN 4 PBA on and again verify that all the AC busses are shown as green with the AC Bus 1 and AC Bus 4 being powered this time from GEN 4.

    1. If wiring checks are not good, repair defective wiring as required and do close out.
    2. If wiring checks are good, continue with next step.

  8. Repeat the GEN 4 on and off switching two or three times to ensure that the AC Bus 1 and AC Bus 4 power source switching follows.

    1. If there is CAS Message, troubleshoot them first and do close out.
    2. If there is no CAS Message, continue with next step.

  9. For contactor K6 or K10 fault, on the ELECTRICAL Control Panel set the GEN 1 and GEN 4 PBAs to "ON".
  10. Verify that AC Electrical Synoptic page shows all the AC busses powered, that the AC Bus 2 is powered from GEN 4 and AC Bus 3 from GEN 1.

    1. If wiring checks are not good, repair defective wiring as required and do close out.
    2. If wiring checks are good, continue with next step.

  11. Set the GEN 3 PBA on and again verify that all the AC busses are shown as green with the AC Bus 2 and AC Bus 3 being powered this time from GEN 3.

    1. If wiring checks are not good, repair defective wiring as required and do close out.
    2. If wiring checks are good, continue with next step.

  12. Repeat the GEN 3 on and off switching two or three times to ensure that the AC Bus 2 and AC Bus 3 power source switching follows.

    1. If there is CAS Message, troubleshoot them first and do close out.
    2. If there is no CAS Message, continue with next step.

  13. For contactor K9 or K7 fault, on the ELECTRICAL Control Panel set the GEN 1 and GEN 4 PBAs to "ON".
  14. Verify that AC Electrical Synoptic page shows all the AC busses powered, that the AC Bus 3 is powered from GEN 1 and AC Bus 2 from GEN 4.

    1. If wiring checks are not good, repair defective wiring as required and do close out.
    2. If wiring checks are good, continue with next step.

  15. Set the GEN 2 PBA on and again verify that all the AC busses are shown as green with the AC Bus 3 and AC Bus 2 being powered this time from GEN 2.

    1. If wiring checks are not good, repair defective wiring as required and do close out.
    2. If wiring checks are good, continue with next step.

  16. Repeat the GEN 2 on and off switching two or three times to ensure that the AC Bus 3 and AC Bus 2 power source switching follows.

    1. If there is CAS Message, troubleshoot them first and do close out.
    2. If there is no CAS Message, continue with next step.

  17. For contactor K12 or K5 fault, on the ELECTRICAL Control Panel set the GEN 2 and GEN 3 PBAs to "ON".
  18. Verify that AC Electrical Synoptic page shows all the AC busses powered, that the AC Bus 4 is powered from GEN 2 and AC Bus 1 from GEN 3.

    1. If wiring checks are not good, repair defective wiring as required and do close out.
    2. If wiring checks are good, continue with next step.

  19. Set the GEN 1 PBA on and again verify that all the AC busses are shown as green with the AC Bus 4 and AC Bus 1 being powered this time from GEN 1.

    1. If wiring checks are not good, repair defective wiring as required and do close out.
    2. If wiring checks are good, continue with next step.

  20. Repeat the GEN 1 on and off switching two or three times to ensure that the AC Bus 4 and AC Bus 1 power source switching follows.

    1. If there is CAS Message, troubleshoot them first and do close out.
    2. If there is no CAS Message, continue with next step.

  21. For contactor K11 or K2 fault, on the ELECTRICAL control panel set the GEN 3 and APU GEN PBAs to "ON".
  22. With APU GEN on, turn the GEN 3 on and off switching two or three times to ensure that the AC Bus 4 power source switching follows from GEN 3 to APU GEN and vice versa (K11 switching).

    1. If wiring checks are not good, repair defective wiring as required and do close out.
    2. If wiring checks are good, continue with next step.

  23. With GEN 3 on, turn the APU GEN on and off switching two or three times to ensure that the AC Bus 1 power source switching follows from APU to GEN 3 and vice versa (K2 switching).
    NOTE: 'AC BUS 2 & 3 FAIL' and 'DC BUS 2 FAIL' CAS messages will appear with this switching condition.

    1. If wiring checks are not good, repair defective wiring as required and do close out.
    2. If wiring checks are good, continue with next step.

  24. Check for CAS message 'AC BUS 2 & 3 FAIL' and 'DC BUS 2 FAIL' appear with this switching condition.

    1. If there is CAS Message, troubleshoot them first and do close out.
    2. If there is no CAS Message, continue with next step.

  25. For contactor K3 or K8 fault, on the Electrical control panel set the GEN 2 and APU GEN PBAs to "ON".
    NOTE: only Engine 1 has to be running for this test.
  26. With APU GEN on, turn the GEN 2 on and off switching two or three times to ensure that the AC Bus 1 power source switching follows from GEN 2 to APU GEN and vice versa (K3 switching).

    1. If wiring checks are not good, repair defective wiring as required and do close out.
    2. If wiring checks are good, continue with next step.

  27. With GEN 2 on, turn the APU GEN on and off switching two or three times to ensure that the AC Bus 4 power source switching follows from APU to GEN 2 and vice versa (K8 switching).
    NOTE: 'AC BUS 2 & 3 FAIL' and 'DC BUS 2 FAIL' CAS messages will appear with this switching condition.

    1. If wiring checks are not good, repair defective wiring as required and do close out.
    2. If wiring checks are good, continue with next step.

  28. Check for CAS message 'AC BUS 2 & 3 FAIL', 'DC BUS 2 FAIL' and 'ELEC SYS' appear with this switching condition.

    1. If there is no CAS Message, do close out.
    2. If there is CAS Message, continue with next step.

  29. Troubleshoot the CAS Message as required.
  30. Do close out.

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