04/08/21
Message Overview:
Message Description:
The 422 XM data bus is reported as inactive by at least one File Server Unit (FSU). FSU Label 354 bit 18 indicates the 422 bus has failed. The 422 data bus goes from the XM receiver to the FSU.
Possible Causes:
- XM Weather Receiver (A231)
- File Server Unit 1 (FSU 1) (A221)
- File Server Unit 2 (FSU 2) (A222)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
Fault Confirmation Procedure:
- Message# = 3
- {Term Definitions}
- FSU1-45 1X 354 01 EXCT XXXX-XXXX XXXX-TXXX XXXX-XXXX 354 :20;SUBSCRIPTION INVALID
- FSU2-45 2X 354 10 EXCT XXXX-XXXX XXXX-TXXX XXXX-XXXX 354 :20;SUBSCRIPTION INVALID
- FSU1-43 1X 354 01 EXCT XXXX-XXXX XXXX-XXTX XXXX-XXXX 354 :18;422 BUS INACTIVE
- FSU2-43 2X 354 10 EXCT XXXX-XXXX XXXX-XXTX XXXX-XXXX 354 :18;422 BUS INACTIVE
Quick Links:
| Operational Test of the Single Integrated Flight Information System (IFIS) | AMM 46-21-00-710-801 |
| Operational Test of the Dual Integrated Flight Information System (IFIS) | AMM 46-21-00-710-803 |
| Load the FSA-5000 Application Software to the File Server Unit (FSU) | AMM 46-21-01-970-801 |
| Removal of the File Server Unit (FSU) | AMM 46-21-01-000-801 |
| Installation of the File Server Unit (FSU) | AMM 46-21-01-400-801 |
| Removal of the XM Weather Receiver | AMM 46-21-05-000-801 |
| Installation of the XM Weather Receiver | AMM 46-21-05-400-801 |
| Wiring - Maintenance Practices - ALL | SPM 20-12-00-02 |
| Wire Repair - Maintenance Practices - ALL | SPM 20-12-10-02 |
Troubleshooting Recommendations:
- Suspect a bad XM 422 output, wiring or FSU 422 input problem.
- The XM subscription.