DOC AIRBUS | TSM A320FPower Supply Under-Run Fault
TASK 21-58-00-810-811-A
Power Supply Under-Run Fault
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
3. Fault Confirmation
Subtask 21-58-00-710-070-A ** ON A/C NOT FOR ALL
Subtask 21-58-00-810-060-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:24:50 UTC
Power Supply Under-Run Fault
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| ASM 215301 |
Subtask 21-58-00-710-070-A ** ON A/C NOT FOR ALL
A. Not applicable.
4. Fault IsolationSubtask 21-58-00-810-060-A ** ON A/C NOT FOR ALL
A. If the GROUND REPORT gives the maintenance message PWR SPLY UNDER-RUN:
(1) Do the checks which follow:
(a) do a check for 28VDC at:
1 CSAS CONTROL UNIT (100HW)AC pin 9 and pin 11 ASM 215301.
(2) If the fault continues:
(1) Do the checks which follow:
(a) do a check for 28VDC at:
1 CSAS CONTROL UNIT (100HW)AC pin 9 and pin 11 ASM 215301.
(2) If the fault continues:
- do the trouble shooting of the electrical power supply (Ref. TSM Chapter 24).