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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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Quick Links

01/25/21

Message Overview:

AUTO PRESS FAIL
(Caution)

DDG Reference: DDG Section 2 CAS - 2
Pilot Action (QRH): ENVR 06-6
System Description: 21-31-00
Schematic Diagram: 21-31-00
Wiring Diagram: 21-31-01

Message Description:

Automatic pressurization modes have failed or no data is being received from the outflow valve to the IASCs and the system is not in manual mode.

Possible Causes:

  • Outflow Valve (OFV) (MPE1)
  • Integrated Air System Controller 1 - FWD (IASC 1) (A55)
  • Integrated Air System Controller 2 - AFT (IASC 2) (A56)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

  • AW300-21-0047 - No MDC Report upon "AUTO PRESS FAIL" CAS Message

Forum Articles/Infoservice/Newsletter: None

IASC LOGIC:

  • The IASC is looking for data from the outflow valve.
  • The IASC received OFV Auto Channel INOP from the OFV.

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
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Check the current faults and fault history for problems related to the IASC controller and pressurization system.

    2. If the 'AUTO PRESS FAIL' CAS message is displayed and there are no message recorded in the MDC, continue with next step.

  2. Perform the Operational Test of the Cabin Pressure Control System.

    1. If test passes, do close out.
    2. If test fails, continue with the next step.

  3. Replace Outflow Valve.
  4. Do close out.

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