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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

04/07/21

Message Overview:

Message Name:

DISCRETE INPUT TO DCU
(Service Message)

Message Code:

B3-006850

Associated CAS:

None

Reporting LRU: HI PRESS VALVE 2
System Description: 36-00-00
Schematic Diagram: 36-11-00
Wiring Diagram: 36-15-02

Message Description:

A disagreement has been detected between the position feedback from the HIGH PRESSURE VALVE 2 to the Data Concentrator Unit and the WING PBA selection feedback to the Data Concentrator Unit.

Possible Causes:

  • High Pressure Valve 2 (HPV) (V6)
  • High Pressure Sensor 2 (HPS) MT20)
  • Integrated Air System Controller 2 (IASC) (A56)
  • Data Concentrator Unit (DCU) (A14)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

  1. Message# = 5
  2. {Term Definitions}

    1. DWDC2-9 2X 110 00 EXCT XXXX-XXXX XXXX-XXXT XXXX-XXXX 110R: 17;R HPV OPEN
    2. DWDC2-16 2X 111 00 EXCT XXXX-XXXX XXXX-XXXX XXTX-XXXX 111B: 14;WING A/I SELECTED OFF B

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
Leak Test of the High-Pressure Bleed-Air System AMM 36-15-00-790-801
Removal of the High Pressure Valve AMM 36-15-01-000-801
Installation of the High Pressure Valve AMM 36-15-01-400-801
Removal of the High Pressure Sensors AMM 36-15-03-000-801
Installation of the High Pressure Sensors AMM 36-15-03-400-801
Operational Test of the Maintenance Diagnostic System AMM 45-45-00-710-801
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Do a wiring check.

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