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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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For AOG assistance contact:

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Quick Links

06/08/21

Message Overview:

Message Name:

DISAG VLV CLSD/DPS DRIFT

Message Code:

B3-006705

Associated CAS:

PACK FAIL
(Caution)

R BLEED FAULT
(Advisory)

Reporting LRU: FLOW CTRL VLV2
System Description: 21-23-00
36-10-00
Schematic Diagram: 21-51-00
Wiring Diagram: 21-51-09
21-53-05

Message Description:

The right FLOW CONTROL VALVE is detected failed in closed position or the right DPS has drifted.

NOTE: FCV switch disagree and DPS drift detection do not lead to Message.

Possible Causes:

  • Flow Control Valve (FCV) 2 (MPE4)
  • Integrated Air System Controller (IASC) 2 (A56)
  • Valve Switch
  • Position Switch
  • 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
Operational Test of the Integrated Air System (IAS) Controller AMM 21-31-01-710-801
Removal of the Flow Control Valve AMM 21-51-09-000-801
Deactivation of the Flow Control Valve AMM 21-51-09-040-801
Installation of the Flow Control Valve AMM 21-51-09-400-801
Activation of the Flow Control Valve AMM 21-51-09-440-801
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Verify the closed commanded position when the flow control valve #2 MPE4 has failed.
  2. Valve position can be viewed through the IASC LRU test pages. Interrogate the respective IASC to view valve position and bleed air pressure.
    The indicated valve position can be verified against the Bleed Valve Status page by comparing the indication to the valves mechanical visual indicator.
  3. Check the wiring between the #2 Integrated Air System Controller and the #2 flow control valve MPE4. If the switch is suspected, check the IASC #2 (A56) for proper switch indication of the effective flow control valve (FCV will provide a ground to the IASC for closed, and open circuit for the valve being open) IAW AWM 21-51-09.
  4. Swap or replace the suspected flow control valve or deactivate per the AMM. Reactivate per AMM.
  5. Suspect the #2 IAS controller, remove and replace per AMM.
  6. Operational test of the Integrated Air System (IAS) Controller.

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