12/12/23
Message Overview:
| DDG Reference: | None |
| Pilot Action (QRH): | FUEL 09-20 |
| 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:
The measured bulk fuel temperature is above 54°C (129°F) in an aircraft where the Fuel Return To Tank (FRTT) system is not installed or is installed with the respective valve closed.
-or-
The measured bulk fuel temperature is above 10°C (50°F) on the (left/right) side where the FRTT valve is open (or failed open) in an aircraft where the FRTT system is installed.
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:
- Was either the L FUEL RECIRC FAIL (Caution) or R FUEL RECIRC FAIL (Caution) CAS message displayed at the time the WING FUEL HI TEMP (Caution) CAS message was displayed?
- If YES, troubleshoot those messages first.
- 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.
- Using the PMAT, access CAIMS - SYSTEM DIAG - ATA 28 - FMQGC CH. A(B) - LRU TEST and select LEFT(RIGHT) WING FUEL TEMPERATURE.
- Compare and record the left and right wing temperature sensor readings on both FMQGC channels.
Temperature
SensorFMQGC Ch.A FMQGC Ch.B Related
Troubleshooting PageTS1L 2844601PK TS2L 2844602PK TS1R 284466DPK TS2R 284466EPK TS3R 284466FPK - 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.
- If all the temperature sensor values are similar to each other, continue with next step.
- Perform the Operational Test of the Thermal Management System (AMM 28-26-00-710-801).
- If the test results are satisfactory, continue with next step.
- If the test results are not satisfactory, troubleshoot accordingly and rectify.
- Rerack the FMQGC making sure it is fully and properly pushed in its tray. Is the WING FUEL HI TEMP (Caution) CAS message still present?
- If YES, replace the FMQGC and do close out.
- If NO, continue with next step.
- Do close out.