07/23/19
Message Overview:
| DDG Reference: | 29-31-03 |
| Pilot Action (QRH): | ABNORM 10-15 |
| 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 No. 3 hydraulic system 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)
- Reservoir 3 Quantity Transducer (MT145)
- 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 2 qty. is high while system 3 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.3 Hydraulic System Reservoir | AMM 29-13-29-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of No.3 Hydraulic System Reservoir | AMM 29-13-29-400-801 [ 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. 3 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 no. 3 reservoir quantity transducer (MT145) and DAU 3.
- 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 No. 3.
- Do close out.