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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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07/29/19

Message Overview:

DAU 4B FAIL
(Advisory)

DDG Reference: None
Pilot Action (QRH): ADVISORY 11-4
System Description: 31-42-00
Schematic Diagram: 31-42-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 31-42-04 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

There is no data transmission from the Data Acquisition Unit (DAU) 4 channel B.

Possible Causes:

  • Power Source
  • Data Acquisition Unit (DAU) 4 (A31)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

  • AW700-45-0002 - CAIMS Member System Functionality Status LDI Sparrow.037

Forum Articles/Infoservice/Newsletter:

There are 4 DAUs in the system. Some signals are redundant between DAUs and each DAU has two fully redundant channels. The channels are independent of each other and each has its own power supply, processor, ASCB and ARINC interface, discrete and analog input/outputs. Since the DAU is a data collection, conversion and transmission device, the failure can have impact to many systems.

Quick Links:

CAIMS PMAT Access to System Diagnostics AMM 45-45-00-970-804 [ Global Express ]  [ G5000 ]  [ Global XRS ]
CAIMS PMAT Integrated Maintenance Test (IMT) Fault Code Look-Up AMM 45-45-00-970-826 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of Data Acquisition Unit (DAU) AMM 31-42-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of Data Acquisition Unit (DAU) AMM 31-42-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Interface WM 31-42-05 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair SPM 20-12-10 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

NOTE: Consult Data Acquisition Unit - NFF Reduction Troubleshooting Tips: before troubleshooting this fault.

  1. Swap DAU 4 with another DAU.

    1. If fault is transferred or gone, go to step 3 and record IMT code to identify the cause of failure of DAU 4.
    2. If not, continue.

  2. Perform wiring checks of DAU 4B interface.

    1. If wiring is good, continue with next step.
    2. if wiring defects are found, repair defective wiring as required.

  3. Connect CAIMS PMAT do the system diagnostics ASCB System TEST (NOTE: original defective DAU 3).

    1. If test passed go to step 4.
    2. If an IMT fault code was generated look up the code and do the corrective action.

  4. Connect CAIMS PMAT do the system diagnostics IAC EDS/Core Test for IAC 1.

    1. If test passed go to step 5.
    2. If an IMT fault code was generated look up the code and do the corrective action.

  5. Connect CAIMS PMAT do the system diagnostics IAC EDS/Core Test for IAC 2.

    1. If test passed go to step 6.
    2. If an IMT fault code was generated look up the code and do the corrective action.

  6. Connect CAIMS PMAT do the system diagnostics IAC EDS/Core Test for IAC 3.

    1. If test passed go to step 7.
    2. If an IMT fault code was generated look up the code and do the corrective action.

  7. Do close out.

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