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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

02/10/20

Message Overview:

Fault Message:

TRU 2 FAN FAILED

Fault Code:

2460463DCP

Associated CAS:

ELEC SYS FAULT
(Advisory)

Reporting LRU: DC Power Center (DCPC)
System Description: 24-31-00
Schematic Diagram: 24-31-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 24-31-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

The Transformer Rectifier Unit (TRU) 2 Fan Speed Sensor is low or no fan output to the DC Power Center (DCPC).

Possible Causes:

  • Transformer Rectifier Unit (TRU) 2 (A74)
  • DC Power Quality Monitor (DCPQM) 2
  • DC Power Center (DCPC) (A63)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

NOTE: The TRU 2 fan fail will show on the DC synoptic page, as the TRU 2 outline will be amber and the TRU output voltage is approximately 28 VDC.

NOTE: If the TRU voltage displayed on the DC synoptic page is different than 28 VDC, check that all three 115 VAC input phases are present. A missing phase could result in the fan not spinning.

Quick Links:

Removal of the Transformer Rectifier Units AMM 24-31-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Transformer Rectifier Units AMM 24-31-01-400-801 [ 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 DC Power Center (DCPC) DC Power Quality Monitor AMM 24-61-13-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the DC Power Center (DCPC) DC Power Quality Monitor AMM 24-61-13-400-801 [ 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:

  1. Get Access to the FWD bay to check for the airflow of the TRU 2 and confirm if the fan is rotating or not.

    1. If the fan is not rotating, replace TRU 2 and do close out.
    2. If the fan is rotating, continue with next step.

  2. Swap TRU 2 with another TRU. Is the fault still present?

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

  3. Disconnect TRU 2 connector A74P1 and DCPC connector A63P2. Perform a continuity check as follows:

    From To Result
    A74P1-D Ground

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

  4. Perform a continuity check as follows:

    From To Result
    A74P1-D A63P2-A

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

  5. Access the DCPC Logic assembly and remove the DCPQM 2 card. Perform a continuity check as follows:

    From To Result
    A63P2-A Ground

    1. If there is continuity, go to step 8.
    2. If there is no continuity, continue with next step.

  6. Perform a continuity check as follows:

    From To Result
    A63P2-A P221A-10

    1. If there is no continuity, go to step 8.
    2. If there is continuity, continue with next step.

  7. Replace the DCPQM 2 card.

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

  8. Replace DCPC.
  9. Do close out.

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