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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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03/19/21

Message Overview:

Message Name:

NO L-GP-1 BUS INPUT

Message Code:

B3-006441

Associated CAS:

None

Reporting LRU: CDU 2
System Description: 34-00-00
34-61-00
Schematic Diagram: 34-61-00
Wiring Diagram: 34-61-03
34-61-07

Message Description:

CDU2 is reporting L-GP-1 bus inactive, while at least 2 of the following are reporting L-GP-1 active; CDU1, ADC1, RIU1. L IOC data is present.

Possible Causes:

  • Control Display Unit (CDU) (A69)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

  1. LRU = CDU2 CDU 2
  2. ATA Chapter = 34-61
  3. Message# = 12
  4. Comp Id = A069
  5. {Term Definitions}

    1. CDU2-5 2X 350 10 EXCT XXXX-XXXX XXXX-XXXX XXTX-XXXX 350: 14;NO L-GP-1 BUS INPUT
    2. IOC1-1 1X 350 01 ABSN XXXX-XXXX XXXX-XXXX XXXX-XXXX 350: (A) NO IOC 1X IN;
    3. ADC1-4 1X 350 01 EXCT XXXX-XXXX XXXX-XXXX XTXX-XXXX 350: 15;NO L-GP-1 IN
    4. CDU1-5 1X 350 01 EXCT XXXX-XXXX XXXX-XXXX XXTX-XXXX 350: 14;NO L-GP-1 IN
    5. RIU1-26 1X 351 01 EXCT XXXX-XXXX XXXX-TXXX XXXX-XXXX 351: 20;NO L-GP-1 INPU

Quick Links:

Removal of the Control Display Unit (CDU) AMM 34-61-05-000-801
Installation of the Control Display Unit (CDU) AMM 34-61-05-400-801
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02
Electrical Connectors - Maintenance Practice - ALL SPM 20-20-00-02

Troubleshooting Recommendations:

  1. Suspect wiring or the CDU.

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