DOC AIRBUS | TSM A320FEIU-1 Relay Fault for Latch Door Power Supply
TASK 73-25-00-810-A04-A
EIU-1 Relay Fault for Latch Door Power Supply
1. Possible Causes
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Fault Confirmation
Subtask 73-25-00-710-439-A ** ON A/C NOT FOR ALL
Subtask 73-25-00-810-263-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:36:25 UTC
EIU-1 Relay Fault for Latch Door Power Supply
1. Possible Causes
- EIU-1 [1KS1]
aircraft wiring between connector (443VC1) and EIU-1 - FAN COWL LATCH PROXIMITY SENSOR HARNESS [4145KS]
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| REFERENCE | DESIGNATION |
|---|---|
| AMM 71-13-61-000-802 | Removal of the Pylon Fan Cowl Latch Proximity Sensor Harness (4145KS) |
| AMM 71-13-61-400-802 | Installation of the Fan Cowl Latch Proximity Sensor Harness (4145KS) |
| AWM 715177 | |
| AMM 73-25-34-000-802 | Removal of the Engine Interface Unit (EIU) |
| AMM 73-25-34-400-802 | Installation of the Engine Interface Unit (EIU) |
| AMM 73-25-34-710-802 | Operational Test of the Engine Interface Unit (EIU) with the Centralized Fault Display System (CFDS) |
| AWM 783609 |
Subtask 73-25-00-710-439-A ** ON A/C NOT FOR ALL
A. Do the operational test of the Engine Interface Unit (EIU) with the Centralized Fault Display System (CFDS) to confirm this fault AMM 73-25-34-710-802.
4. Fault IsolationSubtask 73-25-00-810-263-A ** ON A/C NOT FOR ALL
A. Check for EIU fault
(1) Replace EIU-1 [1KS1] AMM 73-25-34-000-802 and AMM 73-25-34-400-802.
(2) Do the test given in Para. 3.
(3) If the fault continues:
(a) Go to the Para. 4.B.
Subtask 73-25-00-865-062-A ** ON A/C NOT FOR ALL (1) Replace EIU-1 [1KS1] AMM 73-25-34-000-802 and AMM 73-25-34-400-802.
(2) Do the test given in Para. 3.
(3) If the fault continues:
(a) Go to the Para. 4.B.
B. Open, safety and tag this(these) circuit breaker(s):
Subtask 73-25-00-810-264-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENG 1) | |||
| 121VU | ENGINE/LATCH DOORS & SLATS/ENG1 | 93KS1 | P39 |
C. Check for harness fault
(1) Disconnect connector (443VC1-A).
(2) Check for 28 VDC to pins 21, 24 and 23 AWM 715177.
(a) If there is 28 VDC at any pin, repairaircraft wiring between connector (443VC1) and EIU-1 , refer to AWM 783609.
(b) If there is no 28 VDC at any pin:
1 Replace FAN COWL LATCH PROXIMITY SENSOR HARNESS [4145KS] AMM 71-13-61-000-802 and AMM 71-13-61-400-802.
2 Do the test given in Para. 3.
(1) Disconnect connector (443VC1-A).
(2) Check for 28 VDC to pins 21, 24 and 23 AWM 715177.
(a) If there is 28 VDC at any pin, repair
(b) If there is no 28 VDC at any pin:
1 Replace FAN COWL LATCH PROXIMITY SENSOR HARNESS [4145KS] AMM 71-13-61-000-802 and AMM 71-13-61-400-802.
2 Do the test given in Para. 3.