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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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04/26/24

Message Overview:

ELEC SYS FAIL
(Caution)

DDG Reference: 24-30-00
Pilot Action (QRH): ELEC 04-19
System Description: 24-00-00
Schematic Diagram: 24-70-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 24-70-04 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Message Description:

A fault has been detected in the Electrical System.

Possible Causes:

  • AC Power Center (ACPC) (A54)
  • ACPC Microprocessor card
  • ACPC Supervisor card
  • Electrical Management System Control-and-Display Unit (EMS CDU) 1 (A94)
  • Electrical Management System Control-and-Display Unit (EMS CDU) 2 (A91)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

  • AW700-24-0252 - "ELEC SYS FAULT" and or "ELEC SYS FAIL" - Nuisance CAS Message during Power Up
  • AW700-24-0304 - "ELEC SYS FAIL" CAS message

Forum Articles/Infoservice/Newsletter: None

Flight Operation Notifications Manual (FONM):

  • [ Global Express ]  [ G5000 ]  [ Global XRS ] FON 01-08 ELEC-001 -  [ELEC SYS FAULT] (Advisory/Cyan) or [ELEC SYS FAIL] (Advisory/Amber) during Aircraft Power-Up

NOTES: 

  • If the ELEC SYS FAIL CAS message is active on Battery power only, the PMAT will not be accessible. For troubleshooting instructions refer to Observed Fault "247OBS007 - Electrical System Troubleshooting Via EMS CDU Signboard.

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) Fault-Tolerant Supervisor AMM 24-51-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the AC Power Center (ACPC) Fault-Tolerant Supervisor AMM 24-51-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the AC Power Center (ACPC) Fault-Tolerant Microprocessor AMM 24-51-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the AC Power Center (ACPC) Fault-Tolerant Microprocessor AMM 24-51-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Electrical Management System Control-and-Display Units (EMS CDU) AMM 24-70-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Electrical Management System Control-and-Display Units (EMS CDU) AMM 24-70-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Access to Active Faults AMM 45-45-00-970-802 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Access to Stored Faults AMM 45-45-00-970-803 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

Select related CAIMS message below.

  1. Otherwise:

    1. If no CAIMS messages are present, continue with next step.
    2. If the ELEC SYS FAIL CAS message is active on Battery power only, the CAIMS will not be accessible. For troubleshooting instructions refer to Observed Fault "247OBS007 - Electrical System Troubleshooting Via EMS CDU Signboard".

  2. Access the EMS CDU signboard menu. Press on the SYSTEM button. Select COUNTERS. Are any of the counters indicating "0"?

    1. If the ACPC IN counter is 0, go to step 5.
    2. If YES, go to step 4.
    3. If NO, continue with next step.

  3. Access the COUNTERS on the opposite EMS CDU. Are any of the counters set to "0"?

    1. If the ACPC IN counter is 0, go to step 5.
    2. If YES, continue with next step.
    3. If NO, perform troubleshooting using task 247OBS007.

  4. Perform a wiring check between the EMS CDU and the affected component on that channel. Repair defective wiring as required.
  5. Remove the affected EMS CDU. Perform a resistance check of the databus channel between the affected EMS CDU and the ACPC as follows:

    ACPC BUS 1 to EMS CDU 1.

    From To Expected Result Result
    A94P1-5 A94P1-6 18Ω (± 2Ω)

    ACPC BUS 2 to EMS CDU 2

    From To Expected Result Result
    A91P1-5 A91P1-6 18Ω (± 2Ω)

    1. If resistance values are good, continue with next step.
    2. If resistance values are not good, troubleshoot the wiring interface.

  6. Access the ACPC logic assembly. Swap the left microprocessor with the right microprocessor. Is the fault still present on the same side?

    1. If YES, continue with next step.
    2. If NO, replace defective microprocessor card.

  7. Swap the Left and right EMS CDUs. Is the fault still present on the same side?

    1. If YES, continue with next step.
    2. If NO, replace defective EMS CDU.

  8. Perform the ACPC card isolation procedure to identify is a card is faulty.

    1. If a card is faulty, replace card.
    2. If no card was found faulty, continue with next step.

  9. Replace the Supervisor card. Is the fault still present?

    1. If YES, replace the ACPC.
    2. If NO, do close out.

  10. Do close out.



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