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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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03/22/21

Message Overview:

Message Name:

NO L-GP-4 BUS INPUT

Message Code:

B3-006817

Associated CAS:

None

Reporting LRU: GPS 2
System Description: 34-00-00
Schematic Diagram: 34-55-00
Wiring Diagram: 34-55-01

Message Description:

L-GP-4 bus data absent at R-GPS and NOT absent at WXR OR L-GPS and IOC 1 is transmitting data to MDC.

Possible Causes:

  • Global Positioning Receiver No. 2 (RH) (A24)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

  1. LRU = GPS2 GPS 2
  2. ATA Chapter = 34-58
  3. Message# = 7
  4. Comp Id = A024
  5. {Term Definitions}

    1. GPS2-2 2X 355 10 EXCT XXXX-XXXX XXXT-XXXX XXXX-XXXX 355: 21;NO L-GPBUS-4 INPUT
    2. IOC1-1 1X 350 01 ABSN XXXX-XXXX XXXX-XXXX XXXX-XXXX 350: (A) NO IOC 1X IN;
    3. GPS1-3 1X 355 01 EXCT XXXX-XXXX XXTX-XXXX XXXX-XXXX 355: 22;NO L-GPBUS-4 INPUT
    4. GPS2-2 2X 355 10 EXCT XXXX-XXXX XXXT-XXXX XXXX-XXXX 355: 21;NO L-GPBUS-4 INPUT
    5. WXRA-3 1X 354 01 EXCT XXXX-XXXX XXXX-TXXX XXXX-XXXX 354A: 20;NO L-GP-4 INPUT
    6. IOC1-1 1X 350 01 ABSN XXXX-XXXX XXXX-XXXX XXXX-XXXX 350: (A) NO IOC 1X IN;

Quick Links:

Removal of the Global Positioning Receiver AMM 34-55-01-000-801
Installation of the Global Positioning Receiver AMM 34-55-01-400-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Repair Wiring SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Suspect failed L-GP-4 input to R GPS or wiring.

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