02/23/21
Message Overview:
Message Name:
NO R-GP-1 BUS INPUT
Message Code:
B3-007826
Associated CAS:
| Reporting LRU: | RIU 2 |
| System Description: | 23-00-00 |
| Schematic Diagram: | None |
| Wiring Diagram: | None |
Message Description:
R-GP-1 bus input absent at R-RIU and not (L-CDU, R-CDU, R-ADC).
Possible Causes:
- Right Radio Interface Unit (RIU) (A18)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
Fault Confirmation Procedure:
- Message# = 20
- Comp Id = A018
- Fault Logged = AIR, TAXI
- Status = FAILED/WIRING
- {Term Definitions}
- RIU2-26 2X 351 10 EXCT XXXX-XXXX XXXX-TXXX XXXX-XXXX 351: 20; R-GPBUS INACTIVE
- CDU1-4 1X 350 01 EXCT XXXX-XXXX XXXX-XXXX XXXT-XXXX 350: 13; NO R-GP-1 IN
- CDU2-4 2X 350 10 EXCT XXXX-XXXX XXXX-XXXX XXXT-XXXX 350: 13; NO R-GP-1 BUS INPUT
- ADC2-4 2X 350 10 EXCT XXXX-XXXX XXXX-XXXX XTXX-XXXX 350: 15; NO R-GP-1 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 |
| Standard Practices - Replace Wiring | SPM 20-12-00-02 |
| Standard Practices - Wire Repair | SPM 20-12-10-02 |
Troubleshooting Recommendations:
- Suspect failed R-RIU input or wiring.