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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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04/14/21

Message Overview:

Message Name:

X-CHANNEL BUS 1A

Message Code:

B3-303446

Associated CAS:

L ENGINE MINOR FAULT
(Advisory)

Reporting LRU: L ENG ECU A
System Description: 76-11-00
Schematic Diagram: None
Wiring Diagram: None

Message Description:

Left engine cross channel bus fault 1A.

[MCID 0905]
Cross-channel data bus 1A.
A fault related to the cross-channel data link on ECU A is sensed.

Possible Causes:

  • Full Authority Digital Engine Control Unit (FADEC) Electronic Control Unit A (ECU) (A41)
  • Full Authority Digital Engine Control Unit (FADEC) Electronic Control Unit B (ECU) (A43)
  • Wiring Harness (W5)
  • Wiring Harness (W4)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter:

Quick Links:

General Visual Inspection of the Engine Wiring Harness AMM 71-50-00-210-802
Removal of the FADEC Electrical Harness from the Left Engine AMM 71-50-05-000-802
Installation of the FADEC Electrical Harness on the Left Engine AMM 71-50-05-400-802
Removal of the Engine Electronic Control Unit (ECU) AMM 76-10-05-000-801
Installation of the Engine Electronic Control Unit (ECU) AMM 76-10-05-400-801
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. MCID 0905 fault present, troubleshoot using the following steps for aircraft and engine fault isolation with reference to the Light Engine Maintenance Manual Subtask 72-00-00-810-135-A01.

CB3-C3

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