07/22/19
Message Overview:
| DDG Reference: | 29-31-03 |
| Pilot Action (QRH): | ABNORM 10-15 |
| System Description: | 29-30-00 |
| Schematic Diagram: | 29-12-00 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Wiring Diagram: | 29-00-04 [ Global Express ] [ G5000 ] [ Global XRS ] |
Fault Description:
DAU 2 is reporting that the hydraulic system No. 2 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 | <31% |
| -16˚C to ≤4˚C | <39% |
| 5˚C to ≤26˚C | <47% |
| 27˚C to ≤49˚C | <54% |
| 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) 2 (A18)
- Reservoir 2 Quantity Transducer (MT142)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin:
- Hydraulic System - Fluid Transfer AW 700T-002
Forum Articles/Infoservice/Newsletter:
- Infoservice 2002-April issue 02
NOTE 1: If hydraulic system 3 qty. is high while system 2 qty. is low, follow instructions in Observed Fault - Hydraulic fluid transfer
NOTE 2: To avoid hydraulic fluid transfer from one system to another, follow procedure in FCOM1 04-09-1 when setting the parking brake.
Quick Links:
| Quantity Check of the Hydraulic Reservoir Fluid | AMM 12-12-00-610-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Hydraulic Components Leakage Rates | AMM 29-00-00-910-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of Data Acquisition Units (DAU) | AMM 31-42-01-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of Data Acquisition Units (DAU) | AMM 31-42-01-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of No. 1 and No. 2 Hydraulic System Reservoir | AMM 29-12-25-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of No. 1 and No. 2 Hydraulic System Reservoir | AMM 29-12-25-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of EDP | AMM 29-12-01-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of EDP | AMM 29-12-01-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of Hydraulic Pressure Transducers | AMM 29-31-01-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of Hydraulic Pressure Transducers | AMM 29-31-01-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Wire Repair | SPM 20-12-10 [ 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 No. 2 is properly serviced.
- If system low quantity found, service system. Check system for leaks. If no leaks are noted, do to close out.
- If quantity is good, continue with next step.
- Swap DAUs.
- If fault is no longer present. Replace failed DAU. Do close out.
- If fault remains, continue with next step.
- Perform wiring check between hydraulic system 2 reservoir quantity transducer (MT142) and DAU 2.
- If faults are found/repaired and message clears, do a 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 a close out.
- If wiring checks are good, continue with next step.
- Replace Hydraulic Reservoir 2.
- Do close out.