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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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07/01/19

Message Overview:

Fault Message:

EMS CDU 2/SPDA 2 /WRG

Fault Code:

2470207CDU

Associated CAS:

ELEC SYS FAULT
(Advisory)

Reporting LRU: Electrical Management System Control and Display Unit (EMS CDU) 2
System Description: 24-60-00
Schematic Diagram: 24-62-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 24-62-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]
24-70-04 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

ARINC 429 communication between the Secondary Power Distribution Assembly (SPDA) 2 and the Electrical Management System Control and Display Unit (EMS CDU) 2 is faulty. The Line Replacement Unit (LRU) transmits a test label on a periodic basis and the label is echoed back by the receiving LRU.

Possible Causes:

  • Electrical Management System Control and Display Unit (EMS CDU) 2 (A91)
  • Secondary Power Distribution Assembly (SPDA) 2 (A14)
  • Junction Box (JB3)
  • Junction Box (JB4)
  • Junction Box (JB3)/PCB2
  • Junction Box (JB4)/PCB2
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Make sure the JB3 and JB4 are racked properly. Field experience revealed many cases of Junction Boxes not installed properly.

Fault confirmation:

  1. Flight deck effect:

    1. On the EMS CDU 2, SPDA 2 electrical loads are dashed.

  2. Alternative fault confirmation:

    1. On EMS CDU 2, select the diagnostic mode.

      1. Select SYSTEM - CNTL key (page 1/3)
      2. Select lower left side key.
      3. Select lower right side key.

    2. On EMS CDU 2, select CIRCUIT BREAKER - SYS key and counters.

      1. SPDA 2 IN= 0=loss of communication from SPDA 2 to EMS CDU 2
      2. PCDA OUT= 0=loss of communication from EMS CDU 2 to ACPC, DCPC, SPDA 1, SPDA 2, SPDA 3, SPDA 4 and EMS CDU 1.

Quick Links:

Removal of the Junction Box JB3 AMM 24-00-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Junction Box JB3 AMM 24-00-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Junction Box JB3 Circuit-Cards AMM 24-00-02-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Junction Box JB3 Circuit-Cards AMM 24-00-02-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Junction Box JB4 AMM 24-00-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Junction Box JB4 AMM 24-00-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Junction Box JB4 Circuit-Cards AMM 24-00-06-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Junction Box JB4 Circuit-Cards AMM 24-00-06-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the DC Power Center (DCPC) AMM 24-61-00-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the DC Power Center (DCPC) AMM 24-61-00-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Secondary-Power Distribution Assemblies AMM 24-62-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Secondary-Power Distribution Assemblies AMM 24-62-01-400-801 [ 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 ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Swap EMS CDU 2 with EMS CDU 1.

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

  2. Swap the SPDA 2 with SPDA 4.

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

  3. Perform wiring checks between EMS CDU 2 and SPDA 2, SPDA 4, SPDA 1, DCPC, ACPC and SPDA 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.

  4. Replace JB3 PCB2/JB3.

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

  5. Replace JB4 PCB2/JB4.
  6. Do close out.

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