DOC AIRBUS | TSM A320FCSAS Control Unit Fault
TASK 21-58-00-810-801-A
CSAS Control Unit Fault
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 21-58-00-710-050-A ** ON A/C NOT FOR ALL
Subtask 21-58-00-810-050-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:24:49 UTC
CSAS Control Unit Fault
1. Possible Causes
- CSAS CONTROL UNIT [100HW]
- 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 21-58-34-000-001 | Removal of the CSAS Control Unit |
| AMM 21-58-34-400-001 | Installation of the CSAS Control Unit |
Subtask 21-58-00-710-050-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 21-58-00-810-050-A ** ON A/C NOT FOR ALL
A. If the test gives a different maintenance message, do the related trouble shooting procedure.
Subtask 21-58-00-810-069-A ** ON A/C NOT FOR ALL B. If the test gives the maintenance message CSAS CTL UNIT (100HW):
Subtask 21-58-00-710-051-A ** ON A/C NOT FOR ALL - replace the CSAS CONTROL UNIT [100HW] AMM 21-58-34-000-001 and AMM 21-58-34-400-001.
- do a check and repair the wiring between:
the CSAS PRESSURE SENSOR (117HW) to the CSAS CONTROL UNIT (100HW),
the CSAS PRESSURE SENSOR (117HW) to ground,
the CSAS ISOLATION VALVE (111HW) to the CSAS CONTROL UNIT (100HW),
the CSAS ISOLATION VALVE (111HW) to ground,
the CSAS BYPASS VALVE (113HW) to the CSAS CONTROL UNIT (100HW),
the CSAS BYPASS VALVE (113HW) to ground ASM 215301.
- do a check and repair the wiring between:
the CSAS TEMPERATURE SENSOR (115HW) to the CSAS CONTROL UNIT (100HW),
the CSAS TEMPERATURE SENSOR (115HW) to ground,
the IGGS CONTROL UNIT (100HW) to the CSAS CONTROL UNIT (100HW),
the CFDIU (1TW) to the CSAS CONTROL UNIT (100HW),
the SDAC 1 (1WV1) to the CSAS CONTROL UNIT (100HW),
the FWC1 (1WW1) to the CSAS CONTROL UNIT (100HW),
the FWC2 (1WW2) to the CSAS CONTROL UNIT (100HW) ASM 215301. - do a check for 28VDC at:
CSAS CONTROL UNIT (100HW)AC pin 9 and pin 11.
C. Do the test as given in the Para. 3.A.