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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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02/02/21

Message Overview

Message Name:

NO IASC-2 RS422 TO OFV

Message Code:

B3-006920

Associated CAS:

None

Reporting LRU: IASC2 TST A
System Description: 21-31-00
Schematic Diagram: None
Wiring Diagram: 21-31-05

Message Description:

The outflow valve auto actuator does not receive any data from the IASC-2.

Possible Causes:

  • Junction Box 2 (JB2)
  • Cabin Pressure Control System Outflow Valve (MPE1)
  • Integrated Air System Controller (IASC) (A56)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

  • AW300-21-0047 - No MDC Report upon "AUTO PRESS FAIL" CAS Message (20003 - 20500)
  • SB 100-21-10 - Modification - Cabin-Pressure Control System - Software Change of the Integrated Air System Controller (IASC) Part No. 92175A030400 to Part No. 92175A30500 (20003 - 20291)

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Operational Test of the Cabin Pressure Control System AMM 21-31-00-710-801
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 Outflow Valve AMM 21-31-05-000-801
Installation of the Outflow Valve AMM 21-31-05-400-801
Removal of the Junction Box JB1 AMM 24-63-05-000-802
Installation of the Junction Box JB1 AMM 24-63-05-400-802
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Check the wiring from the outflow valve MPE1 to the IASCs. Dual transmit and receive signals from the IAS Controllers and the outflow enable signal pass through Junction Box #2.
  2. Perform the Operational Test of the Cabin Pressure Control System outflow valve MPE1, look for operational faults.
  3. Replace the outflow valve.

30_outflow_valve30_system_block

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