DOC AIRBUS | TSM A320FCSAS Bypass valve Fault
TASK 21-58-00-810-804-A
CSAS Bypass valve Fault
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 21-58-00-710-056-A ** ON A/C NOT FOR ALL
Subtask 21-58-00-810-053-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:24:49 UTC
CSAS Bypass valve Fault
1. Possible Causes
- BYPASS VALVE [113HW]
- wiring
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| ASM 215301 | |
| AMM 21-58-00-710-001 | Operational Test of the Conditioned Service Air System without Bleed Air |
| AMM 21-58-52-000-001 | Removal of the Bypass Valve |
| AMM 21-58-52-400-001 | Installation of the Bypass Valve |
Subtask 21-58-00-710-056-A ** ON A/C NOT FOR ALL
A. Do the operational test of the conditioned service air system without bleed air AMM 21-58-00-710-001.
4. Fault IsolationSubtask 21-58-00-810-053-A ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message BYP VLV (113HW):
Subtask 21-58-00-710-057-A ** ON A/C NOT FOR ALL - replace the BYPASS VALVE [113HW] AMM 21-58-52-000-001 and AMM 21-58-52-400-001.
- do a check and repair the wiring from:
- the BYPASS VALVE (113HW) to the CSAS CONTROL UNIT (100HW) and,
- the BYPASS VALVE (113HW) to ground ASM 215301.
B. Do the test as given in the Para. 3.A.