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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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04/07/21

Message Overview:

Message Name:

DISAGREE / VALVE CLOSED

Message Code:

B3-006841

Associated CAS:

L WING ANTI-ICE FAIL
(Caution)

Reporting LRU: HI PRESS VALVE 1
System Description: 36-00-00
Schematic Diagram: 30-12-00
Wiring Diagram: 36-15-01

Message Description:

The HIGH PRESSURE VALVE 1 is detected failed in closed position.

Possible Causes:

  • High Pressure Valve 1 (HPV) (V5)
  • HPV Position Switch
  • Integrated Air System Controller 1 (IASC) (A55)
  • 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
Leak Test of the High-Pressure Bleed-Air System AMM 36-15-00-790-801
Removal of the High Pressure Valve AMM 36-15-01-000-801
Installation of the High Pressure Valve AMM 36-15-01-400-801
Removal of the High Pressure Sensors AMM 36-15-03-000-801
Installation of the High Pressure Sensors AMM 36-15-03-400-801
Operational Test of the Maintenance Diagnostic System AMM 45-45-00-710-801
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Set the Wing anti-ice to ON. Make sure the XBLEED rotary switch is set to NORM.
  2. Visually inspect the left high pressure valve position.

    1. If the valve is physically in the closed position, continue with next step.
    2. If the valve is physically in the opened position, go to step 5.

  3. Remove power from the aircraft and disconnect HP valve 1 connector V5P1. With the WING ANTI-ICE switch still in the ON position and the XBLEED switch still in NORM, perform a continuity check and make sure a ground is present on connector V5P1 pin 2.

    1. If there is a ground present, replace the the High pressure valve.
    2. If a ground is not present, continue with next step.

  4. Perform a wiring check between the HP valve and the Anti-Ice Control Panel and repair defective wiring as required.
  5. Access and disconnect IASC 1 connector A55P4. Perform a continuity check to make sure a ground is not present on connector A55P4 pin 34.

    1. If a ground is present on pin 34, continue with next step.
    2. If a ground is not present, go to step IASC

  6. Disconnect HP valve 1 connector V5P1. Perform a continuity check between HP valve 1 and IASC 1 as follows:

    From To Expected Result Result
    A55P4-34 V5P1-5 Continuity
    A55P4-34 Ground Open

    1. If wiring defects are found, repair defective wiring as required and do close out.
    2. If no wiring defects are found, replace HP valve 1 and do close out.

  7. Replace IASC 1. You may swap IASC 1 and 2 for faulty unit confirmation.
  8. Do close out.

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