02/23/21
Message Overview:
Message Name:
NO L-MFD-3 BUS INPUT
Message Code:
B3-007827
Associated CAS:
| Reporting LRU: | RIU 2 |
| System Description: | 23-00-00 |
| Schematic Diagram: | None |
| Wiring Diagram: | None |
Message Description:
L-MFD-3 bus data absent at R-RIU and NOT absent at 2-OF (L-PFD, R-PFD, R-MFD).
Possible Causes:
- Right Radio Interface Unit (RIU) (A18)
- Left Multi-Function Display-3 (MFD) (A29)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
Fault Confirmation Procedure:
- Message# = 21
- Comp Id = A018
- Fault Logged = AIR, TAXI
- Status = FAILED/WIRING
- {Term Definitions}
- RIU2-28 2X 351 10 EXCT XXXX-XXXX XTXX-XXXX XXXX-XXXX 351: 23; L-MFD-3 INACTIVE
- PFD1-11 1X 350 NA EXCT XXXX-XXXX XXXX-TXXX XXXX-XXXX 350: 20; NO L-MFD-3 INPUT
- PFD2-10 2X 350 NA EXCT XXXX-XXXX XXXX-XTXX XXXX-XXXX 350: 19; NO L-MFD-3 INPUT
- MFD2-10 2X 350 NA EXCT XXXX-XXXX XXXX-XTXX XXXX-XXXX 350: 19; NO L-MFD-3 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 |
| Removal of the Adaptive Flight-Display Unit | AMM 31-61-01-000-801 |
| Installation of the Adaptive Flight-Display Unit | AMM 31-61-01-400-801 |
| Standard Practices - Replace Wiring | SPM 20-12-00-02 |
| Standard Practices - Wire Repair | SPM 20-12-10-02 |
Troubleshooting Recommendations:
- Suspect failed L-MFD-3 output, wiring, or failed R-RIU input.