DOC AIRBUS | TSM A320FEEC A Supply Fault on EIU-1
TASK 73-25-00-810-B11-A
EEC A Supply Fault on EIU-1
1. Possible Causes
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Fault Confirmation
Subtask 73-25-00-710-550-A ** ON A/C NOT FOR ALL
Subtask 73-25-00-810-422-A ** ON A/C NOT FOR ALL
Subtask 73-25-00-860-154-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:36:49 UTC
EEC A Supply Fault on EIU-1
1. Possible Causes
- wiring
- EIU-1 [1KS1]
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | MULTIMETER - STANDARD |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| REFERENCE | DESIGNATION |
|---|---|
| AWM 732503 | |
| 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) |
Subtask 73-25-00-710-550-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 73-25-00-810-422-A ** ON A/C NOT FOR ALL
A. If there is confirmation of the fault:
(1) Check on report for any failure of normal BUS bar (401PP).
(a) Troubleshoot as necessary (Ref. TSM Chap. 24).
(b) Do the test given in Para. 3.
(c) If no fault regarding the BUS bars is reported or if the fault continues, continue to troubleshoot at the Para. 4.C.
Subtask 73-25-00-865-148-A ** ON A/C NOT FOR ALL (1) Check on report for any failure of normal BUS bar (401PP).
(a) Troubleshoot as necessary (Ref. TSM Chap. 24).
(b) Do the test given in Para. 3.
(c) If no fault regarding the BUS bars is reported or if the fault continues, continue to troubleshoot at the Para. 4.C.
B. Open, safety and tag this(these) circuit breaker(s):
Subtask 73-25-00-810-423-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENG 1) | |||
| 49VU | ENGINE/1/FADEC A/AND EIU 1 | 2KS1 | A04 |
C. If no fault regarding the BUS bar is reported or if the fault continues:
(1) Remove the EIU-1 (1KS1) AMM 73-25-34-000-802.
(2) Use a MULTIMETER - STANDARD to check for ground at pin 27 of connector AC on SHELF 85VU.
(3) Close the circuit breakers. Refer to the Para. 4.D.
(4) Check for 28 VDC at pin 29 of connector AC on SHELF 85VU.
(5) Open the circuit breakers. Refer to the Para. 4.B.
(6) If you find damage, repair or replace wiring AWM 732503.
(7) If no problem is found or if the fault continues:
(a) Replace EIU-1 [1KS1] AMM 73-25-34-400-802.
(b) Close circuit breakers. Refer to the Para. 4.D.
(c) Do the test given in Para. 3.
Subtask 73-25-00-865-160-A ** ON A/C NOT FOR ALL (1) Remove the EIU-1 (1KS1) AMM 73-25-34-000-802.
(2) Use a MULTIMETER - STANDARD to check for ground at pin 27 of connector AC on SHELF 85VU.
(3) Close the circuit breakers. Refer to the Para. 4.D.
(4) Check for 28 VDC at pin 29 of connector AC on SHELF 85VU.
(5) Open the circuit breakers. Refer to the Para. 4.B.
(6) If you find damage, repair or replace wiring AWM 732503.
(7) If no problem is found or if the fault continues:
(a) Replace EIU-1 [1KS1] AMM 73-25-34-400-802.
(b) Close circuit breakers. Refer to the Para. 4.D.
(c) Do the test given in Para. 3.
D. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
5. Close-up| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENG 1) | |||
| 49VU | ENGINE/1/FADEC A/AND EIU 1 | 2KS1 | A04 |
Subtask 73-25-00-860-154-A ** ON A/C NOT FOR ALL
A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(1) Make sure that the work area is clean and clear of tools and other items.