B3-006394 - DISAGREE / VALVE CLOSED [BLEED VALVE 2]

04/06/21

Message Overview:

Message Name:

DISAGREE / VALVE CLOSED

Message Code:

B3-006394

Associated CAS:

Reporting LRU:	BLEED VALVE 2
System Description:	36-10-00
Schematic Diagram:	36-11-00
Wiring Diagram:	21-31-05

Message Description:

The Bleed Valve 2 is detected failed in closed position. Check valve or position switch or wiring between the valve and the bleed/air condition panel.

Possible Causes:

Bleed Valve 2 (V4)
Integrated Air System Controller 2 (IASC) (A56)
Junction Box (JB2)
Air Conditioning / Bleed Control Panel (PL17)
Fire-Detection And Extinguishing Control Unit (FIREX) (A91)
Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

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
Removal of the Junction Box JB2	AMM 24-63-05-000-803
Installation of the Junction Box JB2	AMM 24-63-05-400-803
Removal of the Fire-Detection-and-Extinguishing (FIREX) Control-Unit	AMM 26-11-01-000-801
Installation of the Fire-Detection-and-Extinguishing (FIREX) Control-Unit	AMM 26-11-01-400-801
Operational Test of the Bleed Air System	AMM 36-11-00-710-801
Removal of the Intermediate Pressure Valve	AMM 36-11-05-000-801
Installation of the Intermediate Pressure Valve	AMM 36-11-05-400-801
Removal of the Bleed-Air Control Panel	AMM 36-11-57-000-801
Installation of the Bleed-Air Control Panel	AMM 36-11-57-400-801
Wiring - Maintenance Practices - ALL	SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL	SPM 20-12-10-02

Troubleshooting Recommendations:

Make sure the R BLEED PBA is ON.
Reset the R BLEED VALVES (V04) circuit breakers CB2-D15.
1. If system checks are good, do close out.
2. If fault remains, continue with next step.
Do wiring check between the right bleed valve (V4) and the ground. Repair as required.
1. If system checks are good, do close out.
2. If fault remains, continue with next step.
Manually set the lever of the right bleed valve (V4) to OPEN and CLOSED, then do a continuity check between Pin 4 and Pin 5 of the connector V4J1.
1. If there is continuity, go to step 6.
2. If there is no continuity, continue with next step.
Replace the right bleed valve.
1. If system checks are good, do close out.
2. If fault remains, continue with next step.
Do the Operational Test of the Bleed Air System.
1. If system checks are good, do close out.
2. If fault remains, continue with next step.
Do wiring check between the right bleed valve (V4) and the IASC 2. Repair as required.
1. If system checks are good, do close out.
2. If fault remains, continue with next step.
Swap the IASC 2 with the IASC 1.
1. If system checks are good, do close out.
2. If fault remains, continue with next step.
Do wiring check between the right bleed valve and the Air Cond/Bleed Panel. Repair as required.
1. If system checks are good, do close out.
2. If fault remains, continue with next step.
Do wiring check of the Air Cond/Bleed Panel. Repair as required or replace the ON/OFF R BLEED PBA.
1. If system checks are good, do close out.
2. If fault remains, continue with next step.
Do wiring check between the Air Cond/Bleed Panel and the JB2. Repair as required.
1. If system checks are good, do close out.
2. If fault remains, continue with next step.
Do wiring check between PIN B2 and B3 of the JB2.
1. If system checks are good, do close out.
2. If fault remains, continue with next step.
Replace Junction Box #2.
1. If system checks are good, do close out.
2. If fault remains, continue with next step.
Do wiring check between JB2 and the Circuit Breaker CB2-D15. Repair as required.
1. If system checks are good, do close out.
2. If fault remains, continue with next step.
Do wiring check between JB2 and the FIREX Control Unit. Repair as required.
1. If system checks are good, do close out.
2. If fault remains, continue with next step.
Replace the FIREX Control Unit.
Do close out.