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(WARNING)
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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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03/31/21

Message Overview:

Message Name:

L FSU INPUT BUS FAILURE

Message Code:

B3-509763

Associated CAS:

None

Reporting LRU: MFD 2
System Description: 31-61-00
Schematic Diagram: 31-61-00
Wiring Diagram: 31-61-04

Message Description:

Single FSU is strapped. Left FSU input bus is not present to the right MFD but is not being indicated as failed by the left MFD. This could possibly be a failed MFD input, a wiring failure, a problem with the FSU or a failed MFD bus output to the FSU.

Possible Causes:

  • Adaptive Flight Display Unit (AFD) (A29)
  • File Server Unit (FSU) (A221)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

  1. Message# = 39
  2. {Term Definitions}

    1. MFD2-43 2X 156 01 EXCT XXXX-XXXX XXXX-XXXX XTXX-XXXX 156: 15;ETHERNET BUS ACTIVITY
    2. MFD1-39 1X 156 01 EXCT XXXX-XXXX XXXX-XXXX XTXX-XXXX 156: 15;ETHERNET BUS ACTIVITY
    3. MFD1-40 1X 156 01 EXCT XXXT-XXXX XXXX-XXXX XXXX-XXXX 156: 29;ETHERNET NODE INSTALLED
    4. MFD2-44 2X 156 01 EXCT XXXT-XXXX XXXX-XXXX XXXX-XXXX 156: 29;ETHERNET NODE INSTALLED
    5. OPT1-87 XX 360 NA EXCT CSU WD-13 XXTX-XXXX XXXX-XXXX 360-13: 14;FSU LEFT
    6. OPT1-88 XX 360 NA EXCT CSU WD-13 XTXX-XXXX XXXX-XXXX 360-13: 15;FSU RIGHT
    7. FSU1-1 1X 350 01 ABSN XXXX-XXXX XXXX-XXXX XXXX-XXXX 350: (A) NO IOC 1X IN

Quick Links:

Removal of the Adaptive Flight-Display Unit AMM 31-61-01-000-801
Installation of the Adaptive Flight-Display Unit AMM 31-61-01-400-801
Removal of the File Server Unit (FSU) AMM 46-21-01-000-801
Installation of the File Server Unit (FSU) AMM 46-21-01-400-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Repair Wiring SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Single FSU is strapped. Left FSU input bus is not present to the right MFD but is not being indicated as failed by the left MFD. This could possibly be a failed MFD input, a wiring failure, a problem with the FSU or a failed MFD bus output to the FSU.

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