02/08/21
Message Overview:
| DDG Reference: | None |
| Pilot Action (QRH): | ADVISORY 11-4 |
| System Description: | 31-44-00 |
| Schematic Diagram: | 31-44-00 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Wiring Diagram: | 31-44-01 [ Global Express ] [ G5000 ] [ Global XRS ] |
Message Description:
None of the three bus controllers in the ASCB system have control of the ASCB system.
Possible Causes:
- Integrated Avionics Computer (IAC) 1 (A11)
- Integrated Avionics Computer (IAC) 2 (A10)
- Integrated Avionics Computer (IAC) 3 (A12)
- Avionics Standard Communication Bus (ASCB) System
- ASCB System Wiring
- R PRI ASCB Isolation Coupler (A236)
- R BAC ASCB Isolation Coupler (A100)
- L PRI ASCB Isolation Coupler (A235)
- L BAC ASCB Isolation Coupler (A97)
- ASCB Termination Resistors
- Primary Bus Controller
- Backup Bus Controller
- Radio Bus Controller
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
For in depth ASCB BUS troubleshooting recommendations and test equipment detail, refer to the ASCB Fault Isolation Guide.
Quick Links:
| Removal of the Integrated Avionics Computers (IAC) | AMM 31-41-01-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the Integrated Avionics Computers (IAC) | AMM 31-41-01-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Operational Test of the Digital Bus System | AMM 31-44-00-710-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of the Isolation Couplers | AMM 31-44-01-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the Isolation Couplers | AMM 31-44-01-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Integrated Maintenance Test (IMT) Fault Code Look-up | AMM 45-45-00-970-826 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Wire Repair | SPM 20-12-10 [ Global Express ] [ G5000 ] [ Global XRS ] |
Troubleshooting Recommendations:
- Select related CAIMS message below: