02/18/21
Message Overview:
Message Name:
NO LB-RIU-9 BUS OUTPUT
Message Code:
B3-007800
Associated CAS:
| Reporting LRU: | RIU 1 |
| System Description: | 23-00-00 |
| Schematic Diagram: | None |
| Wiring Diagram: | None |
Message Description:
LB-RIU-9 bus absent at 2-of (R-CDU, R-MFD, R-PFD).
Possible Causes:
- LB Radio Interface Unit (RIU)-9
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
Fault Confirmation Procedure:
- Message# = 20
- Comp Id = A017
- Fault Logged = AIR, TAXI
- Status = FAILED/WIRING
- {Term Definitions}
- CDU2-7 2X 350 10 EXCT XXXX-XXXX XXXX-XXXX TXXX-XXXX 350: 16; NO LB-RIU-9 I
- PFD2-35 2X 351 NA EXCT XXXX-XTXX XXXX-XXXX XXXX-XXXX 351: 27; NO LB-RIU-9 INPUT
- MFD2-36 2X 351 NA EXCT XXXX-XTXX XXXX-XXXX XXXX-XXXX 351: 27; NO LB-RIU-9 INPUT
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 |
| Standard Practices - Replace Wiring | SPM 20-12-00-02 |
| Standard Practices - Wire Repair | SPM 20-12-10-02 |
Troubleshooting Recommendations:
- Suspect failed LB-RIU-9 output or wiring.