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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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04/06/21

Message Overview:

Message Name:

DISAGREE / VALVE CLOSED

Message Code:

B3-006389

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 closed 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)
  • Integrated Air System Controller 1 (IASC) (A55)
  • Junction Box (JB1)
  • Air Conditioning/Bleed Control Panel (Center Pedestal) (PL17)
  • Fire-Detection-and-Extinguishing (FIREX) Control-Unit (A91)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Integrated Air System (IAS) Controller AMM 21-31-01-000-801
Installation of the Integrated Air System (IAS) Controller AMM 21-31-01-400-801
Removal of the Junction Box JB1 AMM 24-63-01-000-802
Installation of the Junction Box JB1 AMM 24-63-01-400-802
Removal of the Fire-Detection-and-Extinguishing (FIREX) Control-Unit AMM 26-11-01-000-801
Installation of the Fire-Detection-and-Extinguishing (FIREX) Control-Unit AMM 26-11-01-400-801
Operational Test of the Bleed Air System AMM 36-11-00-710-801
Removal of the Intermediate Pressure Valve AMM 36-11-05-000-801
Installation of the Intermediate Pressure Valve AMM 36-11-05-400-801
Removal of the Bleed-Air Control Panel AMM 36-11-57-000-801
Installation of the Bleed-Air Control Panel AMM 36-11-57-400-801
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 ON.
  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 check between 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 4 and Pin 5 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 IASC 1. Repair as required.

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

  8. Swapthe IASC 1 with the IASC 2.

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

  9. Do wiring check between the left bleed valve and the Air Cond/Bleed Panel. Repair as required.

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

  10. Do wiring check of the Air Cond/Bleed Panel. Repair as required or replace the ON/OFF L BLEED PBA.

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

  11. Do wiring check between the Air Cond/Bleed Panel and the JB1. Repair as required.

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

  12. Do wiring check between PIN B2 and B3 of the JB1.

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

  13. Replace JB 1.

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

  14. Do wiring check between JB1 and the Circuit Breaker CB1-D15. Repair as required.

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

  15. Do wiring check between JB1 and the FIREX Control Unit. Repair as required.

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

  16. Replace the FIREX Control Unit.
  17. Do Close out.

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