02/18/21
Message Overview:
Message Name:
NO RB-RIU-7 BUS OUTPUT
Message Code:
B3-007821
Associated CAS:
| Reporting LRU: | RIU 2 |
| System Description: | 23-00-00 |
| Schematic Diagram: | None |
| Wiring Diagram: | None |
Message Description:
RB-RIU-7 bus absent at R-NAV-ADF/VIR and R-DME.
Possible Causes:
- Right Radio Interface Unit (RIU 2) (A18)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
Fault Confirmation Procedure:
- Message# = 14
- Comp Id = A018
- Fault Logged = AIR, TAXI
- Status = FAILED/WIRING
- {Term Definitions}
- NAV2-9 2X 057 10 EXCT XXXX-XXXX XXXX-XXXX XXTX-XXXX 057V: 14; NO RB-RIU-7 IN TO VIR
- RIU2-26 2X 351 10 EXCT XXXX-XXXX XXXX-TXXX XXXX-XXXX 351: 20; R-GPBUS INACTIVE
- NAV2-3 2X 057 10 EXCT XXXX-XXXX XXXX-XXXX XXTX-XXXX 057A: 14; NO RB-RIU-7 IN TO ADF
- DME2-3 2X 057 10 EXCT XXXX-XXXX XXXX-XXXX XXTX-XXXX 057: 14; NO RB-RIU-7 BUS 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 R-RIU or wiring.