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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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09/09/19

Message Overview:

Fault Message:

[BMC1] X-WING VALVE CMD /X-WING VLV

Fault Code:

3615316BMC

Associated CAS:

L WING A/ICE FAIL
(Caution)

R WING A/ICE FAIL
(Caution)

Reporting LRU: Bleed Management Controller (BMC)
System Description: 30-12-00
Schematic Diagram: 30-11-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 30-11-03 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

The Cross Bleed Wing Anti-Ice Valve (or WAI Isolation Valve) position does not agree with the Bleed Management Controller (BMC) command. Inhibited during Take-Off Landing.

Possible Causes:

  • Wing Cross Bleed Valve (L33)
  • Secondary Power Distribution Assembly (SPDA) 4 (A16)
  • Bleed Management Controller (BMC) 1 (A69)
  • Junction Box JB3/PCB2
  • Junction Box JB3/PCB3
  • Junction Box JB3/PCB4
  • Relay (K12)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

  • AW700-36-0365 - Bleed Management Controller - Data Gathering to Reduce No Fault Found (NFF) rate

Forum Articles/Infoservice/Newsletter:

  • Forum Article 2011-VOL 8 issue 23 - Bleed Management Controller (BMC) Top 10 No Fault Found (NFF) vs. Reliability Improvement Modification Program (RIMP) implementation
  • Questionnaire for replacing the BMC. Follow instructions using this (Fill out form)
    NOTE: Always verify you are working with the current document revision. Access the CIC website to ensure the latest document revision.
    NOTE: Before removing JB3, replace PCB3 or PCB4 Circuit Card if available.
    NOTE: Use spare relay if available.

  • CBW Valve 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 L33P1 from the CBW.
  2. With A/C power on, select the XBLEED switch to "CLSD".
  3. Using a multimeter, measure for 28 VDC at Wing Cross Bleed Valve connector L33P1 as follows:

    From To Expected Result Result
    L33P1-3 L33P1-6 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 WING XBLEED switch to "AUTO" and measure for 28 VDC at Wing Cross Bleed Valve connector L33P1 as follows:

    From To Expected Result Result
    L33P1-4 L33P1-6 28 VDC

    1. If NO, go to step 11.
    2. If YES, continue with next step.

  5. Select WING XBLEED switch to "FROM L" and connect a ground to L33P1-5.
  6. In CAIMS, go to "SYSTEM DIAG", Chap. 36, BMC1, "LRU TEST" and on Discrete & Analog input data page, check position of Wing Cross Bleed Valve,

    1. If NO, go to step 8.
    2. If indicated "FULL CLOSED", continue with next step.

  7. Select WING XBLEED switch to "AUTO", remove the ground from L33P1-5 and connect to L33P1-1. On Discrete & Analog input data page, check position of Wing Cross Bleed Valve.

    1. If indicated "FULL OPEN", replace defective WING 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 WING 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/PCB4.

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

  11. Swap SPDA4 and SPDA3.

    1. If system checks are good, replace SPDA4 and do close out.
    2. If fault remains, continue with next step.

  12. Perform wiring checks of all wires between SPDA4 and the XBLEED VALVE.

    1. If wiring checks are not good, repair defective wiring as required and go to step 13.
    2. If wiring checks are good, continue with next step.

  13. Replace JB3/PCB2 or JB3/PCB3. Also verify relay K12P1 for proper operation.
  14. Do close out.
    Troubleshooting Flow Chart

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