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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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12/12/23

Message Overview:

WING FUEL LO TEMP
(Caution)

DDG Reference: None
Pilot Action (QRH): FUEL 09-21
System Description: 28-26-00 - Thermal Management System
Schematic Diagram: [ G5000 ]  [ Global Express ]  [ Global XRS ] SSM 28-26-00-101 - Thermal Management System - Electrical Schematic
Wiring Diagram: [ G5000 ]  [ Global Express ]  [ Global XRS ] WM 28-26-01-1_003 - Sheet 3 - [Post SB 700-28-034 and Pre SB 700-28-039 - 9002-9084]
[ G5000 ]  [ Global Express ]  [ Global XRS ] WM 28-26-01-1_001 - Sheet 1 - Recirculation - ALL

Message Description:

Indicates to flight crew that the measured bulk fuel temperature is below -35°C (-31°F). The fuel temperature low caution message is independent of whether the Fuel Return To Tank (FRTT) system is installed in the aircraft or not.

Possible Causes:

  • Left Temperature Sensor 1 (TS1L) (E34)
  • Left Temperature Sensor 2 (TS2L) (E35)
  • Right Temperature Sensor 1 (TS1R) (E51)
  • Right Temperature sensor 2 (TS2R) (E37)
  • Right Temperature Sensor 3 (TS3R) (E52)
  • Left Fuel Recirculation Valve
  • Right Fuel Recirculation Valve
  • Fuel Management and Quantity Gauging Computer (FMQGC) (A47)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Flight Operation Notifications Manual (FONM): None

Quick Links:

Grounding of the Aircraft [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM10-11-00-867-801
Removal of the Covers and Plugs [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM10-12-00-020-801
Installation of the Covers and Plugs [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM10-12-00-420-801
Standard Aircraft Configuration for Maintenance [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM12-00-00-867-801
Aircraft Walkaround (for Maintenance) [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM12-00-00-867-802
Connect Electrical Power to the Aircraft [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-00-00-861-801
Electrical/Electronic Safety Precautions [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-00-00-910-801
Electrostatic Discharge Safety Precautions [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM24-00-00-910-802
Operational Test of the Thermal Management System [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM28-26-00-710-801
Operational Test of the Fuel Return to Tank (FRTT) Check Valves
Post SB 700-28-034 and A/C 9111 and Subs		 [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM28-26-00-710-802
Removal of the Computer [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM28-41-01-000-801
Installation of the Computer [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM28-41-01-400-801
Removal of the Temperature Sensors [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM28-41-25-000-801
Installation of the Temperature Sensors [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM28-41-25-400-801
CAIMS PMAT General Instructions [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM45-45-00-970-801
Access to Active Faults [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM45-45-00-970-802
Access to Stored Faults [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM45-45-00-970-803
Access to System Diagnostics [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM45-45-00-970-804
Flight Deck Effect to Fault Correlations [ G5000 ]  [ Global Express ]  [ Global XRS ] AMM45-45-00-970-821
Removal of the Fuel Return to Tank Valve [ G5000 ]  [ Global Express ]  [ Global XRS ] EMM73-14-01-000-801
Installation of the Fuel Return to Tank Valve [ G5000 ]  [ Global Express ]  [ Global XRS ] EMM73-14-01-400-801
Wire Repair - Maintenance Practices - ALL [ G5000 ]  [ Global Express ]  [ Global XRS ] SPM20-12-10-02

Troubleshooting Recommendations:

  1. Was either the L FUEL RECIRC FAIL (Caution) or R FUEL RECIRC FAIL (Caution) CAS message displayed at the time the WING FUEL LO TEMP (Caution) CAS message was displayed?

    1. If YES, troubleshoot those messages first.
    2. If NO, continue with next step.
      NOTE: Before performing the steps below make sure the aircraft has been allowed to reach ambient temperature inside a hangar.

  2. Using the PMAT, access CAIMS - SYSTEM DIAG - ATA 28 - FMQGC CH. A(B) - LRU TEST and select LEFT(RIGHT) WING FUEL TEMPERATURE.
  3. Compare and record the left and right wing temperature sensor readings on both FMQGC channels.

    Temperature
    Sensor    		 FMQGC Ch.A FMQGC Ch.B Related
    Troubleshooting Page
    TS1L 2844601PK
    TS2L 2844602PK
    TS1R 284466DPK
    TS2R 284466EPK
    TS3R 284466FPK

    1. If there is a sensor that is reading noticeably higher or lower compared to the other ones, troubleshoot using the related troubleshooting page in the table above.
    2. If all the temperature sensor values are similar to each other, continue with next step.

  4. Perform the Operational Test of the Thermal Management System (AMM 28-26-00-710-801).

    1. If the test results are satisfactory, continue with next step.
    2. If the test results are not satisfactory, troubleshoot accordingly and rectify.

  5. Rerack the FMQGC making sure it is fully and properly pushed in its tray. Is the WING FUEL LO TEMP (Caution) CAS message still present?

    1. If YES, replace the FMQGC and do close out.
    2. If NO, continue with next step.

  6. Do close out.

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