DOC AIRBUS | TSM A320FCSAS Isolation Valve Fault
TASK 21-58-00-810-802-A
CSAS Isolation Valve Fault
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 21-58-00-710-052-A ** ON A/C NOT FOR ALL
Subtask 21-58-00-810-051-B ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:24:49 UTC
CSAS Isolation Valve Fault
1. Possible Causes
- VALVE-ISOLATION,CSAS [111HW]
- wiring
CSAS Heat Exchanger (5103HM) drain hole
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| ASM 215301 | |
| AMM 21-58-00-710-002 | Operational Test of the Conditioned Service Air System with Bleed Air |
| AMM 21-58-51-000-001 | Removal of the CSAS Isolation Valve |
| AMM 21-58-51-400-001 | Installation of the CSAS Isolation Valve |
Subtask 21-58-00-710-052-A ** ON A/C NOT FOR ALL
A. Do the operational test of the conditioned service air system with bleed air AMM 21-58-00-710-002.
4. Fault IsolationSubtask 21-58-00-810-051-B ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message CSAS ISOL VLV (111HW):
Subtask 21-58-00-710-053-A ** ON A/C NOT FOR ALL - replace the VALVE-ISOLATION,CSAS [111HW] AMM 21-58-51-000-001 and AMM 21-58-51-400-001.
- do a check and repair the wiring from:
- the CSAS ISOLATION VALVE (111HW) AA to the CSAS CONTROL UNIT (100HW) AB/5A,
- the CSAS ISOLATION VALVE (111HW) AH to the CSAS CONTROL UNIT (100HW) AB/8A and,
- the CSAS ISOLATION VALVE (111HW) to ground ASM 215301.
- do a check and clean the
CSAS Heat Exchanger (5103HM) drain hole .
B. Do the test as given in the Para. 3.A.