03/30/21
Message Overview:
Message Name:
NO L-RIU-12 BUS INPUT
Message Code:
B3-438791
Associated CAS:
| Reporting LRU: | CDU 2 |
| System Description: | 34-00-00 |
| Schematic Diagram: | None |
| Wiring Diagram: | None |
Message Description:
L-RIU-12 BUS is reported missing by CDU-2.
Possible Causes:
- Left Radio Interface Unit (RIU) (A17)
- Control Display Unit (CDU) (A69)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
Fault Confirmation Procedure:
- Message# = 17
- Comp Id = A069
- {Term Definitions}
- CDU2-9 2X 350 10 EXCT XXXX-XXXX XXXX-XXTX XXXX-XXXX 350: 18;L-RIU-12 PIN 68,69
- OPT1-83 XX 360 NA EXCT CSU WD-15 XXXX-XXXX TXXX-XXXX 360-15: 8; RIU/CMU1 DATALINK
- DLNK-10 2X 350 01 ABSN XXXX-XXXX XXXX-XXXX XXXX-XXXX 350: (A) NO IOC 2X IN
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 Control Display Unit (CDU) | AMM 34-61-05-000-801 |
| Installation of the Control Display Unit (CDU) | AMM 34-61-05-400-801 |
| Standard Practices - Replace Wiring | SPM 20-12-00-02 |
| Standard Practices - Repair Wiring | SPM 20-12-10-02 |
Troubleshooting Recommendations:
- L-RIU-12 BUS is reported missing by CDU-2.