08/12/19
Message Overview:
Fault Message:
HYD 1 LO QTY
Fault Code:
0000H1LQ
Associated CAS:
| Reporting LRU: | Data Acquisition Unit (DAU) 1 |
| System Description: | 29-30-00 |
| Schematic Diagram: | 29-12-00 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Wiring Diagram: | 29-00-03 [ Global Express ] [ G5000 ] [ Global XRS ] |
Fault Description:
Data Acquisition Unit (DAU) 1 is reporting that the Hydraulic System1 fluid quantity is below the recommended level in relation to the temperature and aircraft configuration. Refer to the table below:
| HYDRAULIC FLUID TEMPERATURE | QUANTITY |
|---|---|
| ≥-40°C to ≤-17°C | <23% |
| -16°C to ≤4°C | <34% |
| 5°C to ≤26°C | <43% |
| 27°C to ≤49°C | <52% |
| 50°C to ≤71°C | <62% |
| 72°C to ≤93°C | <70% |
| Aircraft Condition: Weight on Wheels, system pressurized above 2600 psi and condition set for more than 2 minutes. | |
Possible Causes:
- Data Acquisition Unit (DAU) 1 (A17)
- Hydraulic System 1 Reservoir Quantity Transducer (MT139)
- 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. 1 and No. 2 Hydraulic Systems | AMM 12-12-00-610-801 [ 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. 1 and No. 2 Hydraulic System Reservoirs | AMM 29-12-25-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the No. 1 and No. 2 Hydraulic System Reservoirs | AMM 29-12-25-400-801 [ 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 1 is properly serviced.
- If quantity is good, go to step 3.
- If system low quantity found, continue with next step.
- Service the system and check for leaks.
- If no leaks are noted, do close out.
- If leaks are noted, continue with next step.
- Swap DAU 1 with DAU 2.
- If system checks are good, replace DAU 1 and do close out.
- If fault remains, continue with next step.
- Perform wiring check between hydraulic system 1 reservoir quantity transducer and DAU 1.
- 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 Reservoir 1.
- Do close out.