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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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03/17/21

Message Overview:

Message Name:

NO L-GP-1 BUS INPUT

Message Code:

B3-006278

Associated CAS:

None

Reporting LRU: ADC 1
System Description: 34-13-00
Schematic Diagram: 34-13-00
Wiring Diagram: 31-45-02

Message Description:

No L-GPBUS-1 data received at L-ADC and 2-of (CDU1, CDU2, RIU1) not reporting failure.

Possible Causes:

  • Left Air Data Computer (ADC 1) (A1)
  • Junction Box 4 (JB 4)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Radio Interface Unit (RIU) AMM 23-51-21-000-801
Installation of the Radio Interface Unit (RIU) AMM 23-51-21-400-801
Removal of the Junction Boxes AMM 24-63-01-000-802
Installation of the Junction Boxes AMM 24-63-01-400-802
Removal of the Air Data Computer AMM 34-13-01-000-801
Installation of the Air Data Computer AMM 34-13-01-400-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Reset AIR DATA 1 (CB1-C1) circuit breaker.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.

  2. Do the wiring check of the ARINC 429 databus L-GP-1 from ADC 1 connector A1P1, through Junction Box 4, to RIU 1 connector A17P1 and to both CDUs (connector A69P1 and connector A68P1). Repair/replace as required.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.

  3. Swap ADCs.
  4. Do close out.

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