09/24/24
Message Overview:
| DDG Reference: | 29-31-03 |
| Pilot Action (QRH): | HYD 11-21 |
| System Description: | 29-30-00 - Engine Indicating |
| Schematic Diagram: | 29-13-00 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Wiring Diagram: | 29-00-05 [ Global Express ] [ G5000 ] [ Global XRS ] |
Message Description:
With the hydraulic system No. 3 pressurized, the reservoir quantity is above the acceptable limits. (Insufficient room for the landing gear retracted hydraulic fluid)
(See the correlation table below for hydraulic quantity message trigger limits):
| HYDRAULIC FLUID TEMPERATURE | QUANTITY |
| ≥-40˚C to ≤-17˚C | >33% |
| -16˚C to ≤4˚C | >40% |
| 5˚C to ≤26˚C | >47% |
| 27˚C to ≤49˚C | >54% |
| 50˚C to ≤71˚C | >62% |
| 72˚C to ≤93˚C | >69% |
| Aircraft Condition: Weight on Wheels and system pressurized above 2600 psi. | |
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 AW700T-002
Full Throttle Blog/Forum Articles/Infoservice/Newsletter:
- Infoservice 2002-April issue 02
NOTES:
- If hydraulic system 3 qty. is high while system 2 qty. is low, follow instructions in Observed Fault - Hydraulic fluid transfer
- To avoid hydraulic fluid transfer from one system to another, follow procedure in FCOM1 04-09-1 when setting the parking brake.
Quick Links:
| Bleeding of the No. 3 hydraulic system | AMM 29-10-00-870-802 [ 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 ] |
| Wire Repair | SPM 20-12-10 [ Global Express ] [ G5000 ] [ Global XRS ] |
Troubleshooting Recommendations:
- Carry out visual check of the hydraulic system quantity.
- If visual quantity shows an overfill condition. Correctly service system. Confirm fault is no longer present. Do close out.
- If fault is still present continue.
- Interchange DAUs (3,1)
- If the hydraulic system #3 quantity checks good, replace failed DAU. Do close out.
- If fault is still present, continue with next step.
- Perform wiring check between hydraulic system 3 reservoir quantity transducer (MT145) and DAU 3.
- If wiring repairs made, confirm fault is no longer present. Do close out.
- If fault is still present, continue with next step.
- Replace system #3 reservoir.
- Do close out.
