08/13/19
Message Overview:
Fault Message:
HYD 3 LO QTY
Fault Code:
0000H3LQ
Associated CAS:
| Reporting LRU: | Hydraulic System 3 |
| System Description: | 29-30-00 |
| Schematic Diagram: | 29-13-00 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Wiring Diagram: | 29-00-05 [ Global Express ] [ G5000 ] [ Global XRS ] |
Fault Description:
The Hydraulic System 3 fluid quantity is below 29% in flight (Weight off Wheels) with main gears up and lock. OR See the correlation tables below for hydraulic quantity message trigger limits on the ground (Weight on Wheels):
| HYDRAULIC FLUID TEMPERATURE | QUANTITY |
|---|---|
| ≥-40°C to ≤-17°C | <19% |
| -16°C to ≤4°C | <26% |
| 5°C to ≤26°C | <33% |
| 27°C to ≤49°C | <40% |
| 50°C to ≤71°C | <47% |
| 72°C to ≤93°C | <54% |
| Aircraft Condition: Weight on Wheels, system pressurized above 2600 psi and condition set for more than 2 minutes. | |
Possible Causes:
- Data Acquisition Unit (DAU) 3 (A30)
- Hydraulic System 3 Reservoir Quantity Transducer (MT145)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
Quick Links:
| Quantity Check of the Hydraulic Fluid in the No. 3 Hydraulic System | AMM 12-12-00-610-802 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Hydraulic Safety Precautions | AMM 29-00-00-910-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of the Engine-Driven Hydraulic Pumps | AMM 29-12-01-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the Engine-Driven Hydraulic Pumps | AMM 29-12-01-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of the No. 3 Hydraulic System Reservoir | AMM 29-13-29-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the No. 3 Hydraulic System Reservoir | AMM 29-13-29-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of the Hydraulic Pressure Transducers | AMM 29-31-01-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the Hydraulic Pressure Transducers | AMM 29-31-01-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of the Data Acquisition Units (DAU) | AMM 31-42-01-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the Data Acquisition Units (DAU) | AMM 31-42-01-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Wire Repair - Maintenance Practices - ALL | SPM 20-12-10-02 [ Global Express ] [ G5000 ] [ Global XRS ] |
Troubleshooting Recommendations:
NOTE: An engine run-up may be required to verify for a leak at the EDP drain mast.
NOTE: For a suspected component leak in the wings, a fuel sample may be required and send to a lab to verify for content of hydraulic fluid in the fuel.
- Ensure Hydraulic System 3 is properly serviced.
- If low quantity found, service system and check system for leaks. If no leaks are noted, do to close out.
- If quantity is good, continue with next step.
- Swap DAU 3 with DAU 4.
- If system checks are good, replace DAU 3 and do close out.
- If fault remains, continue with next step.
- Perform wiring checks between hydraulic system 3 reservoir quantity transducer (MT145) and DAU 3.
- If wiring checks are not good, repair defective wiring as required and do close out.
- If wiring checks are good, continue with next step.
- Carry out an external visual check of the hydraulic system which includes all lines and their component(s). Replace as necessary.
- If faults are found/repaired and message clears, do close out.
- If wiring checks are good, continue with next step.
- Replace Hydraulic System 3 Reservoir Quantity Transducer.
- Do close out.