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(WARNING)
RED MESSAGE (CAUTION)
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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For AOG assistance contact:

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Quick Links

07/22/19

Message Overview:

HYD 1 LO PRESS
(Caution)

DDG Reference: None
Pilot Action (QRH): ABNORM 10-6
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:

DAU 1 is reporting both the EDP 1A and ACMP 1B pressure switches and system pressure transducer are < 1800 psi with engines running or aircraft in a weight-off-wheels condition.

Possible Causes:

  • Low Quantity
  • Hydraulic Fluid Filter Elements
  • Hydraulic System Pressure Relief-Valve (filter manifold)
  • Pressure Transducer
  • Pump
  • Data Acquisition Unit 1 (DAU 1)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

  • 700T-0022 - Hydraulic System -Fluid Transfer
  • 700T-0040 - Unapproved Hydraulic Fluid
  • 700T-0124 - Hydraulic System Filters: Possible Incorrect Filters Installed in Hydraulic Systems 1, 2, and 3

Forum Articles/Infoservice/Newsletter: None

NOTES:

If there are multiple CAS messages, consider troubleshooting sequencing.

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:

Quantity Check of the Hydraulic Reservoir Fluid AMM 12-12-00-610-801 [ 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 Filter Manifold AMM 29-12-09-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of No. 1 and No. 2 Hydraulic System Filter Manifold AMM 29-12-09-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of No. 1 and No. 2 Return Filter Element AMM 29-12-17-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of No. 1 and No. 2 Return Filter Element AMM 29-12-17-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of No. 1 and No. 2 Press Filter Element AMM 29-12-13-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of No. 1 and No. 2 Press Filter Element AMM 29-12-13-400-801 [ 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 No. 1 and No. 2 ACMP AMM 29-12-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of No. 1 and No. 2 ACMP AMM 29-12-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of Hydraulic Temperature Transducers AMM 29-33-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of Hydraulic Temperature Transducers AMM 29-33-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair SPM 20-12-10 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

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

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

  2. Inspect system filter DPI(s).

    1. If DPI tripped. Investigate clogged filter. Do close out.
    2. If not tripped, continue with next step.

  3. Run system 1 AC Motor pump. Check system pressure.

    1. If system pressurizes, replace engine pump. Do close out.
    2. If fault still present, continue with next step.

  4. Run #1 Engine. Check system pressure.

    1. If system pressurizes. Investigate why AC motor pump is not working. Do close out.
    2. If fault is still present, continue with next step.

  5. Perform wiring check between the no. 1 filter manifold transducer (MT140), DAU No. 1 and SPDA 3. Ensure 28 VDC input from SPDA 3 to transducer.

    1. If wiring repairs made. Confirm fault is no longer present. Do close out.
    2. If wiring checks good, continue with next step.
    3. If no voltage Swap SPDA. If failure follows SPDA. Replace failed unit. Do close out.
    4. If fault is still present, continue with next step.

  6. Swap the no. 1 system manifold transducer (MT140) with system 2 system transducer MT143.

    1. If low pressure indication swapped to sys #2 replace failed transducer. Do close out.
    2. If fault remained on #1 system, continue with next step.

  7. Swap DAU no 1 with DAU 2.

    1. If fault is no longer present. Replace failed DAU. Do close out
    2. If fault remains continue.

  8. Replace #1 Hydraulic system manifold filter.

    1. If failure is no longer present, investigate why filter was causing a low pressure condition. Do close out.
    2. If fault is still present, continue with next step.

  9. Swap filter manifolds with system #2.

    1. If fault switched to #2 system replace failed filter manifold. Do close out.
    2. If fault is still present, continue with next step.

  10. Consider a bypassing hydraulic system component. Such as a reservoir may be bypassing from the high to low pressure side.
  11. Do close out.

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