03/17/21
Message Overview:
Message Name:
NO L-ADC-1 BUS INPUT
Message Code:
B3-006301
Associated CAS:
| Reporting LRU: | AHC 1 |
| System Description: | None |
| Schematic Diagram: | None |
| Wiring Diagram: | None |
Message Description:
ARINC 429 L-ADC-1 data bus not received at L-AHC while the data is present at L-IOC.
Possible Causes:
- Junction Box #1 (JB1)
- Left Attitude Heading Computer (AHC 1) (A11)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
Quick Links:
| Removal of the Junction Box JB1 | AMM 24-63-01-000-802 [ CH 300 ] [ CH 350 ] |
| Installation of the Junction Box JB1 | AMM 24-63-01-400-802 [ CH 300 ] [ CH 350 ] |
| Removal of the Air Data Computer | AMM 34-13-01-000-801 [ CH 300 ] [ CH 350 ] |
| Installation of the Air Data Computer | AMM 34-13-01-400-801 [ CH 300 ] [ CH 350 ] |
| Wiring - Maintenance Practices - ALL | SPM 20-12-00-02 [ CH 300 ] [ CH 350 ] |
| Wire Repair - Maintenance Practices - ALL | SPM 20-12-10-02 [ CH 300 ] [ CH 350 ] |
| Electrical Connectors - Maintenance Practice - ALL | SPM 20-20-00-02 [ CH 300 ] [ CH 350 ] |
Troubleshooting Recommendations:
- Reset ATT HDG 1 (CB1-C2) circuit breaker.
- If system checks are good, do close out.
- If fault remains, continue with next step.
- Swap AHCs.
- If system checks are good, do close out.
- If fault remains, continue with next step.
- Do wiring check of the ARINC 429 L-ADC-1 data bus between Left AHC connector A11P1.Junction Box #1, and Left ADC connector A1P1. Repair/replace as required.
- If system checks are good, do close out.
- If fault remains, continue with next step.
- Do close out.