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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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06/29/21

Message Overview:

Message Name:

HYD SYNOPTIC PAGE - BOTH 3A AND 3B FLOW TUBES GREEN ON WITH ONLY ONE PUMP ON

Message Code: 291OBS005
Effectivity: All
System: Hydraulic System 3
System Description: 29-13-00
Schematic Diagram: 29-13-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 29-00-05 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Message Description:

When either Hydraulic Pump 3A or 3B is on, hydraulic pressure and green flow tube on hydraulic synoptic page is displayed on opposite side.

Possible Causes:

  • AC Motor Pump 3A Pressure Switch (S39)
  • AC Motor Pump 3B Pressure Switch (S40)
  • Hydraulic System 3 Filter Manifold
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Hydraulic Safety Precautions AMM 29-00-00-910-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Hydraulic Technical Precautions AMM 29-00-00-910-802 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Pressurize the No. 3 Hydraulic System AMM 29-10-00-862-803 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Release Hydraulic Pressure - No. 3 Hydraulic
System		 AMM 29-10-00-862-804 [ 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 Hydraulic Pressure Switches AMM 29-31-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Hydraulic Pressure Switches AMM 29-31-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. On the Hydraulic HYD synoptic page observe the results of the following tests.
  2. Turn ON both System 3 HYD pumps. Make sure both flow tubes are green.
  3. Shut one HYD pump OFF.

    1. If both flow tubes are still green, go to step 6.
    2. If the flow tube on the OFF side extinguished (empty), continue with next step.

  4. Turn both pumps ON again and shut the opposite pump OFF this time.
  5. Confirm both flow tubes are still green (filled).
  6. Shut both HYD pumps.

    1. If both Flow tubes extinguish (empty), replace the HYD system 3 filter manifold and do close out.
    2. If one flow tube remains green (filled), continue with next step.

  7. Perform a wiring check between the affected side pressure switch and DAU 4.

    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.

  8. Replace the affected side pressure switch.
  9. Do close out.

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