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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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06/30/21

Message Overview:

Message Name:

CBW FAILED IN CLOSED POSITION

Message Code: 301OBS001
Effectivity: All
System: Wing Cross Bleed Valve
System Description: 36-11-00
Schematic Diagram: 36-11-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 30-11-03 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Message Description:

The Wing Cross Bleed Valve (or Wing Anti-Ice (WAI) Isolation Valve) failed in the closed position.

Possible Causes:

  • Wing Cross Bleed Valve (CBW) (L33)
  • Secondary Power Distribution Assembly (SPDA) 4 (A16)
  • Relay (K12)
  • Junction Box (JB3)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Junction Box JB3 AMM 24-00-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Junction Box JB3 AMM 24-00-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Secondary-Power Distribution
Assemblies		 AMM 24-62-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Secondary-Power Distribution
Assemblies		 AMM 24-62-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Wing Cross-Bleed Valve AMM 30-11-09-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Wing Cross-Bleed Valve AMM 30-11-09-400-801 [ 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 Bleed Air Control Panel, set the WING XBLEED switch to the AUTO position.
  2. Measure for 28 VDC at CBW L33P1-4.

    1. If there is no 28 VDC, go to step 4.
    2. If there is 28 VDC, continue with next step.

  3. Replace CBW.

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

  4. Perform wiring checks between SPDA 4, JB3, CBW and GS390.

    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.
      NOTE: Remove all interface components for short circuit test.

  5. Swap SPDA 4 with SPDA 3.

    1. If system checks are good, replace SPDA 4 and do close out.
    2. If fault remains, continue with next step.

  6. Replace K12/JB3.
  7. Do close out.

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