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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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03/03/21

Message Overview:

Message Name:

DISCRETE INPUT TO DCU
(Service Message)

Message Code:

B3-008170

Associated CAS:

None

Reporting LRU: WING XVALVE
System Description: 30-12-00
Schematic Diagram: 30-12-00
Wiring Diagram: 30-11-05

Message Description:

A disagreement has been detected between the position feedback from the WING CROSS BLEED VALVE to the Data Concentrator Unit (DCU) and the WING PBA selection feedback to the DCU.

Possible Causes:

  • Wing Cross-Bleed Valve (MPE10)
  • Anti-Ice Control Panel (PL19)
  • Data Concentrator Unit (DCU) (A14)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Wing Cross-Bleed Valve AMM 30-11-05-000-801
Installation of the Wing Cross-Bleed Valve AMM 30-11-05-400-801
Removal of the Anti-Ice Control Panel AMM 30-11-09-000-801
Installation of the Anti-Ice Control Panel AMM 30-11-09-400-801
Removal of the Data Concentrator Unit (DCU) AMM 31-41-01-000-802
Installation of the Data Concentrator Unit (DCU) AMM 31-41-01-400-802
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Verify XBleed Valve sense line is not obstructed internally, or damaged. Inspect fittings, and pass through for damage.
  2. Manually close the wing cross-bleed valve.
  3. Check for continuity on wing cross-bleed between MPE10J1 pin 4, pin 5.

    1. If there is continuity, continue with next step.
    2. If there is no continuity, go to step 8.

  4. Check for no continuity on wing cross-bleed between MPE10J1 pin 3, pin 4.

    1. If there is continuity, go to step 8.
    2. If there is no continuity, continue with next step.

  5. Manually open the wing cross bleed valve.
  6. Check for no continuity on wing cross-bleed between MPE10J1 pin 4, pin 5.

    1. If there is continuity go to step 8.
    2. If there is no continuity, continue with next step.

  7. Check for continuity on wing cross-bleed between MPE10J1 pin 3, pin 4.

    1. If there is no continuity, continue with next step.
    2. If there is continuity go to step 9.

  8. Replace wing cross bleed valve.

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

  9. Do wiring checks between wing cross-bleed between MPE10J1 pin 3 and the DCU A14BP1 pin 6H, repair as required.

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

  10. Do wiring checks between Anti-Ice Panel and the DCU A14FP1 pin 8K. Repair as required.

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

  11. Replace the Anti-Ice panel.

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

  12. Replace the DCU.
  13. Do close out.

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