02/02/21
Message Overview:
Message Name:
DISCRETE INPUT TO DCU
(Service Message)
Message Code:
B3-006703
Associated CAS:
| Reporting LRU: | FLOW CTRL VLV1 |
| System Description: | 21-61-00 |
| Schematic Diagram: | None |
| Wiring Diagram: | None |
Message Description:
The LEFT FLOW CONTROL VALVE has been detected open while air source is Pack Only or Air Source Off.
Possible Causes:
- Left Flow Control Valve (MPE03)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
Fault Confirmation Procedure:
- Message# = 4
- Message = DISCRETE INPUT TO DCU
- Fault Logged = AIR,TAXI
- Status = FAILED/WIRING
- Message Type = Service Message
- {Term Definitions}
- DWDC1-6 1X 106 00 EXCT XXXX-XXXX XXXX-XXXX XXTX-XXXX 106A: 14;L FCV OPEN
- DWDC1-20 1X 111 00 EXCT XXXX-XXXX XXXX-TXXX XXXX-XXXX 111A: 20;TRIM AIR ONLY SELECTED
- DWDC1-19 1X 111 00 EXCT XXXX-XXXX XXXX-XTXX XXXX-XXXX 111A: 19;AIR SOURCE SELECTED OFF
Quick Links:
| Removal of Flow Control Valve | AMM 21-51-09-000-801 |
| Installation of Flow Control Valve | AMM 21-51-09-400-801 |
| Deactivation of the Flow Control Valve | AMM 21-51-09-040-801 |
| Activation of the Flow Control Valve | AMM 21-51-09-440-801 |
| Installation of Integrated Air System (IAS) Controller | AMM 21-31-01-000-801 |
| Removal of 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:
- The LEFT FLOW CONTROL VALVE has been detected open while air source is Pack Only or Air Source Off. Check wiring.MPE03