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(WARNING)
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AMBER MESSAGE (ADVISORY)
CYAN MESSAGE (STATUS)
WHITE MESSAGE Require immediate crew attention. These messages are accompanied by flashing master warning, triple chime attenson with or without voice message or dedicated tone. Require immediate crew awareness and future crew action may be required in the form of alternate system selection or performance limitation. These message are accompanied by flashing master caution and a single chime. Indicate safe or normal system operation which require crew awareness, over and above the dark cockpit philosophy. Indicate minor failures or reduction in systems capability, which require no crew action.

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08/13/19

Message Overview:

Fault Message:

HYD 3 HI TEMP

Fault Code:

0000H3HT

Associated CAS:

HYD 3 HI TEMP
(Caution)

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 temperature of the Hydraulic Fluid of the Hydraulic System 3 is above 205 °F (96 °C).

Possible Causes:

  • AC Motor Pump (ACMP) 3A Switch (S2)
  • AC Motor Pump (ACMP) 3B Switch (S3)
  • Hydraulic Heat-Exchanger Bypass-Valve
  • Hydraulic System 3 Reservoir Temperature Transducer (MT144)
  • Data Acquisition Unit (DAU) 3 (A30)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

When replacing the pressure filters, a hydraulic lock has been known to prevent new filter installation. A "B" nut next to the filter manifold may need to be loosened or removed to bleed off pressure and allow the installation of the filter.

Quick Links:

Pressure Refueling AMM 12-11-01-650-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Quantity Check of the Hydraulic Fluid in the No. 3 Hydraulic System AMM 12-12-00-610-802 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the No. 3 Hydraulic-System AC-Motor-Driven Pumps AMM 29-13-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the No. 3 Hydraulic-System AC-Motor-Driven Pumps AMM 29-13-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the No. 3 Hydraulic-System Filter Manifold AMM 29-13-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the No. 3 Hydraulic-System Filter Manifold AMM 29-13-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the No. 3 Hydraulic-System Pressure-Filter Element AMM 29-13-09-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the No. 3 Hydraulic-System Pressure-Filter Element AMM 29-13-09-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the No. 3 Hydraulic-System Return-Filter Element AMM 29-13-13-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the No. 3 Hydraulic-System Return-Filter Element AMM 29-13-13-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the No. 3 Hydraulic-System Case-Drain Filter-Elements AMM 29-13-17-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the No.3 Hydraulic-System Case-Drain Filter-Elements AMM 29-13-17-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the No. 3 Hydraulic-System Heat-Exchanger Bypass-Valve AMM 29-13-41-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the No. 3 Hydraulic-System Heat-Exchanger Bypass-Valve AMM 29-13-41-400-801 [ 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:

  1. Carry out a quantity check of the hydraulic system 3.

    1. If low quantity found, service system, check system for leak and do close out.
    2. If quantity is good continue with next step.

  2. Ensure fuel is present in the wing(s).
    NOTE: Hydraulic system 3 fluid heat exchanger is located at the bottom of the left wing fuel tank. Low fuel quantity in the left wing fuel tank can cause high hydraulic fluid temperature.
  3. Operate ACMP 3A and 3B individually and note temperature indication.

    1. If high (above normal range) temperatures are noted with either pump, replace pump and do close out.
    2. If fault remains, continue with next step.

  4. Replace Hydraulic System 3 Filter Elements.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  5. Swap the Hydraulic System 3 Reservoir Temperature Transducers (MT146) with Hydraulic System 2 Reservoir Temperature Transducer (MT141).

    1. If system checks are good, replace Hydraulic System 3 Reservoir Temperature Transducers and do close out.
    2. If fault remains, continue with next step.

  6. Perform wiring checks between Hyd System 3 Reservoir Temperature Transducer (MT146) and DAU 3.

    1. If wiring checks are not good, repair defective wiring as required and do close out.
    2. If wiring checks are good, continue with next step.

  7. Swap DAU 3 with DAU 4.

    1. If system checks are good, replace DAU 3 and do close out.
    2. If fault remains, continue with next step.

  8. Swap the hydraulic filter manifold.

    1. If system checks are good, replace defective hydraulic filter manifold and do close out.
    2. If fault remains, continue with next step.

  9. Replace heat-exchanger bypass-valve.
  10. Do close out.

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