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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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11/21/25

Message Overview:

Message Name:

[CPC2] OUTFLOW VALVE #1

Message Code:

2138317ABG

Associated CAS:

AUTO PRESS FAIL
(Caution)

AUTO PRESS FAULT
(Advisory)

OUTFLOW VLV 1 FAIL
(Advisory)

Reporting LRU: Cabin Pressure Controller (CPC) 2
System Description: 21-31-00 - Cabin Pressure Control System
Schematic Diagram: [ Global Express ]  [ G5000 ]  [ Global XRS ] 21-31-00  Cabin Pressure Control System
Wiring Diagram: [ Global Express ]  [ G5000 ]  [ Global XRS ] 21-31-04  Cabin Pressure Control System

Message Description:

During Power-On Built-in Test (PBIT), the Outflow Valve (OFV) 1 does not respond to test command from Cabin Pressure Controller (CPC) 2.

Possible Causes:

  • Outflow Valve 1 (L8)
  • Cabin Pressure Controller (CPC) 2 (A22)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Full Throttle Blog/Forum Articles/Infoservice/Newsletter: None

Flight Operation Notifications Manual (FONM): None None

NOTES:

  • CPC in control alternates between CPC 1 and CPC 2

     

       

    • CPC1 is used for odd days.
    • CPC2 is used for even days.

Quick Links:

Removal of the Outflow Valves AMM 21-31-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Outflow Valves AMM 21-31-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Initiate an IBIT from CPC2. (CPC1 is used for odd days. CPC2 is used for even days). If test passes with CPC1, Interchange CPC2 and CPC1. If problem follows, replace the defective LRU.
  2. Perform wiring check of the OFV 1 grounds.

    1. If YES, continue with next step.
    2. If NO, replace Cabin Pressure Controller (CPC) 2 and do close out.

  3. Replace OFV#1.
  4. Do close out.

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