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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:

CRC Montreal (YUL)
Quick Links

02/02/21

Message Overview:

Message Name:

DISAG VLV CLSD/DPS DRIFT

Message Code:

B3-006700

Associated CAS:

PACK FAIL
(Caution)
L BLEED FAULT
(Advisory)

Reporting LRU: FLOW CTRL VLV1
System Description: 21-51-00
Schematic Diagram: None
Wiring Diagram: 21-53-05
21-51-09

Message Description:

The LEFT FLOW CONTROL VALVE is detected failed in closed position or the LEFT DPS has drifted. Check valve or position switch or wiring between the valve, and the IASC #1.

NOTE: FCV switch disagree & DPS CAS/Cockpit Message.

Possible Causes:

  • Left Flow Control Valve 1 (FCV 1) (MPE3)
  • Integrated Air System Controller (IASC 1) (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
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
Installation of the Flow Control Valve AMM 21-51-09-400-801
Deactivation of the Flow Control Valve AMM 21-51-09-040-801
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. Check the LEFT DPS and DPS sense lines for leaks, loose connectors, damaged pipes or pressure port obstructions.

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