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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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04/06/21

Message Overview:

Message Name:

DISAGREE / VALVE OPEN

Message Code:

B3-006388

Associated CAS:

L BLEED FAIL
(Caution)

Reporting LRU: BLEED VALVE 1
System Description: 36-10-00
Schematic Diagram: 36-11-00
Wiring Diagram: 21-31-05

Message Description:

The Bleed Valve 1 is detected failed in open position. Check valve or position switch or wiring between the valve and the bleed/air condition panel.

Possible Causes:

  • Bleed Valve 1 (Left Intermediate Pressure Valve) (V3)
  • Data Concentrator Unit (DCU) (A14)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Operational Test of the Bleed Air System AMM36-11-00-710-801
Removal of the Intermediate Pressure Valve AMM36-11-05-000-801
Installation of the Intermediate Pressure Valve AMM36-11-05-400-801
Removal of the Data Concentrator Unit (DCU) AMM31-41-01-000-802
Installation of the Data Concentrator Unit (DCU) AMM31-41-01-400-802
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Make sure the L BLEED PBA is OFF
  2. Reset the L BLEED VALVES (V3) circuit breakers CB1-D15

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

  3. Do wiring checkbetween the left bleed valve (V3) and the ground. Repair as required.

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

  4. Manually set the lever of the left bleed valve (V3) to OPEN and CLOSED, then do a continuity check between Pin 3 and Pin 4 of the connector V3J1.

    1. If there is continuity, go to step 6.
    2. If there is no continuity, continue with next step.

  5. Replace the left bleed valve.

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

  6. Do the Operational Test of the Bleed Air System.

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

  7. Do wiring check between the left bleed valve (V3) and the DCU Repair as required.

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

  8. Replace the DCU.
  9. Do Close out.

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