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(WARNING)
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AMBER MESSAGE (ADVISORY)
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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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09/09/19

Message Overview:

Fault Message:

[BMC1] CROSSBLEED VALVE CMD /CBV

Fault Code:

3615318BMC

Associated CAS:

APU BLEED SYS FAIL
(Caution)

XBLEED FAIL
(Caution)

BLEED MISCONFIG
(Advisory)

Reporting LRU: Bleed Management Controller (BMC)
System Description: 36-11-00
Schematic Diagram: 36-11-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 30-11-04 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

The Cross Bleed Valve position does not agree with the Bleed Management Controller (BMC) 1 command. Inhibited during Take-Off and Landing.

Possible Causes:

  • Cross Bleed Valve (CBV) (L35)
  • Secondary Power Distribution Assembly (SPDA) 3 (A15)
  • Bleed Management Controller (BMC) 1 (A69)
  • Junction Box JB4/PCB2
  • Junction Box JB4/PCB3
  • Relay (K15)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

NOTES:

  • CBV position can be monitored in CAIMS.



  • Test Points are available in the Junction Box to monitor the different signals if needed.

Quick Links:

Removal of the Junction Box JB3 Circuit-Cards AMM 24-00-02-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Junction Box JB3 Circuit-Cards AMM 24-00-02-400-801 [ 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 Cross-Bleed Valve AMM 36-11-29-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Cross-Bleed Valve AMM 36-11-29-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Bleed Management Controller AMM 36-11-33-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Bleed Management Controller AMM 36-11-33-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Disconnect L35P1 from the XSBLEED valve.
  2. With A/C power on, select the XBLEED switch to "CLSD".
  3. Using a multimeter, measure for 28 VDC at Cross Bleed Valve connector L35P1 as follows:

    From To Expected Result Result
    L35P1-3 L35P1-6 28 VDC

    1. If there is no 28 VDC, go to step 11.
    2. If there is 28 VDC, continue with next step.

  4. Select XBLEED switch to "OPEN" and measure for 28 VDC at Cross Bleed Valve connector L35P1 as follows:

    From To Expected Result Result
    L35P1-4 L35P1-6 28 VDC

    1. If there is no 28 VDC, go to step 11.
    2. If there is 28 VDC, continue with next step.

  5. Select XBLEED switch to "CLSD" and connect a ground to L35P1-5.
  6. In CAIMS, go to "SYSTEM DIAG", Chap. 36, BMC1, "LRU TEST" and on Discrete & Analog input data page, check position of Cross Bleed Valve.

    1. If not indicated "FULL CLOSED", go to step 8.
    2. If indicated "FULL CLOSED", continue with next step.

  7. Select XBLEED switch to "OPEN", remove the ground from L35P1-5 and connect to L35P1-1. On Discrete & Analog input data page, check position of Cross Bleed Valve.

    1. If indicated "FULL OPEN", replace defective XBLEED VALVE and do close out.
    2. If NO, continue with next step.

  8. Swap BMC1 and BMC2.

    1. If system checks are good, replace BMC1 and do close out.
    2. If fault remains, continue with next step.

  9. Perform wiring checks of all wires between BMC1 and the XBLEED VALVE.

    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.

  10. Replace JB3/PCB3.

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

  11. Swap SPDA3 and SPDA 4.

    1. If system checks are good, replace SPDA3 and do close out.
    2. If fault remains, continue with next step.

  12. Perform wiring checks of all wires between SPDA3 and the XBLEED VALVE.

    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.

  13. Replace JB4/PCB2 or JB4/PCB3. Also verify relay K15P1 for proper operation.
  14. Do close out.
    Troubleshooting Flow Chart

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