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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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02/03/21

Message Overview:

Message Name:

DISAGREE / VALVE OPEN

Message Code:

B3-007664

Associated CAS:

AIR COND FAULT
(Advisory)
Reporting LRU: PRECOOLER XVALVE
System Description: 21-61-00
Schematic Diagram: None
Wiring Diagram: None

Message Description:

The PRECOOLER CROSS VALVE is detected failed in open position.

Possible Causes:

  • Air Conditioning Panel (PL17)
  • Precooler Cross-Over Valve (MPE11)
  • Precooler Cross Valve Relay
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

  1. Message# = 2
  2. Fault Logged = AIR, TAXI
  3. Status = FAILED/WIRING
  4. Message Type = Fault Message
  5. {Term Definitions}

    1. IAS2A-36 XX 352 10 EXCT XXXX-XXXX XXXX-XXXX XXXX-TXXX 352A:12; PRECOOLER XBLEED VLV FA
    2. IAS1A-32 XX 352 00 EXCT XXXX-XXXX XXXX-XXXX XXXX-TXXX 352A:12; PRECOOLER XBLEED VLV FA

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 Precooler Cross-Over Valve AMM 21-61-07-000-801
Installation of the Precooler Cross-Over Valve AMM 21-61-07-400-801
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
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. The PRECOOLER CROSS VALVE is detected failed in open position. Check wiring. Suspect Air Conditioning panel or Precooler Cross Valve or Precooler Cross Valve Relay.

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