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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:

HYDRAULIC SYSTEM 3 ACCUMULATOR BLEED DOWN TEST FAILS

Message Code: 291OBS008
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:

Hydraulic System 3 Accumulator bleed down test (AMM 29-13-21-720-801) fails.

Possible Causes:

  • Hydraulic System 3 Reservoir
  • Hydraulic System 3 Manifold
  • Hydraulic System 3 Accumulator

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Hydraulic-Components Leakage Rates AMM 29-00-00-790-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Hydraulic Safety Precautions AMM 29-00-00-910-801 [ 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 ]
Functional Test of the No. 3 Hydraulic System
Accumulator		 AMM 29-13-21-720-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the No. 3 Hydraulic System Reservoir AMM 29-13-29-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the No. 3 Hydraulic System Reservoir AMM 29-13-29-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the No. 3 Hydraulic-System Valve
Manifold		 AMM 29-13-57-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the No. 3 Hydraulic-System Valve
Manifold		 AMM 29-13-57-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Disconnect Hyd. Sys. 3 reservoir bootstrap pressure hydraulic tube (Plug tube and cap fitting on hydraulic reservoir).
  2. Pressurize Hyd. Sys. 3 for no more than 5 seconds to pressurize Hyd. Sys. 3 bootstrap accumulator.
    WARNING: Do not operate Hydraulic System 3 in this configuration for more than 5 seconds due to risk of pump cavitation.
  3. Release the hydraulic pressure from Hyd. Sys. 3.
  4. Repeat the bleed down test.

    1. If the bleed down test passes, replace the Hyd. Sys. 3 Reservoir and continue with next step.
    2. If the bleed down test fails, replace the Hyd. Sys. 3 manifold and continue with next step.

  5. Reconnect Hyd. Sys. 3 reservoir bootstrap pressure hydraulic tube.
  6. Repeat the bleed down test.

    1. If the bleed down test passes, do close out.
    2. If the bleed down test fails, continue with next step.

  7. Replace the Hyd. Sys. 3 bootstrap accumulator.
  8. Do close out.

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