08/10/21
Message Overview:
Message Name:
IASC-2 INPUT DISAGREE
(Service Message)
Message Code:
B3-289478
Associated CAS:
| Reporting LRU: | IASC2 TST A |
| System Description: | 21-61-00 |
| Schematic Diagram: | None |
| Wiring Diagram: | None |
Message Description:
IASC-2 has detected a disagree between IASC2 and IASC1. Using raw data IASC1A, IASC1B, IASC2A, IASC2B, check wiring of discrete input (EMER DEPRESS, Man Press, ditching, air source, WAI on and WAI Source) and wiring of analog input (CPCS Cabin Pressure).
Possible Causes:
- Integrated Air System Controller 2 (IASC2) (A56)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
Fault Confirmation Procedure:
- Message# = 19
- Fault Logged = AIR,TAXI
- Status = DEFERRED MAINT
Quick Links:
| Removal of the Integrated Air System (IAS) Controller | AMM 21-31-01-000-801 |
| Installation of the Integrated Air System (IAS) Controller | AMM 21-31-01-400-801 |
| Operational Test of the Integrated Air System (IAS) Controller | AMM 21-31-01-710-801 |
| Standard Practices - Replace Wiring | SPM 20-12-00-02 |
| Standard Practices - Repair Wiring | SPM 20-12-10-02 |
Troubleshooting Recommendations:
- IASC-2 has detected a disagree between IASC2 and IASC1. Using raw data IASC1A, IASC1B, IASC2A, IASC2B, check wiring of discrete input (Emer Depress, Man Press, Ditching, Air Source, WAI on and WAI source) and wiring of analog input (CPCS Cabin Pressure).