DOC AIRBUS | TSM A320FLGCIU-2 Bus Fault on EIU-1
TASK 73-25-00-810-B35-A
LGCIU-2 Bus Fault on EIU-1
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
3. Fault Confirmation
Subtask 73-25-00-710-574-A ** ON A/C NOT FOR ALL
Subtask 73-25-00-810-458-A ** ON A/C NOT FOR ALL
Subtask 73-25-00-860-180-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:36:51 UTC
LGCIU-2 Bus Fault on EIU-1
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 32-31-71-000-001 | Removal of the LGCIU |
| AMM 32-31-71-400-001 | Installation of the LGCIU |
| AWM 326106 | |
| 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 732557 |
Subtask 73-25-00-710-574-A ** ON A/C NOT FOR ALL
A. Do the operational test of the Engine Interface Unit (EIU-1) (1KS1) with the Centralized Fault Display System (CFDS) to confirm this fault. Refer to AMM 73-25-34-710-802.
4. Fault IsolationSubtask 73-25-00-810-458-A ** ON A/C NOT FOR ALL
A. Do as follows:
(1) Replace LGCIU-2 [5GA2] AMM 32-31-71-000-001 and AMM 32-31-71-400-001.
(a) Do the test given in Para. 3.
(2) If the fault continues:
(a) Remove the EIU-1 (1KS1) AMM 73-25-34-000-802.
(b) Remove the LGCIU-2 (5GA2) AMM 32-31-71-000-001.
(c) Test the circuits AWM 732557 and AWM 326106. Refer to table 1. Look for:
1 Wire-to-wire shorts
2 Shorts-to-ground
3 Continuity (less than 5 ohms resistance).
(3) If you find damage:
(a) Repair or replace wiring AWM 732557.
(b) Install the EIU-1 (1KS1) AMM 73-25-34-400-802.
(c) Install the LGCIU-2 (5GA2) AMM 32-31-71-400-001.
(d) Do the test given in Para. 3.
(4) If you find no damage or if the fault continues:
(a) Replace EIU-1 [1KS1] AMM 73-25-34-000-802 and AMM 73-25-34-400-802.
(b) Install the LGCIU-2 (5GA2) AMM 32-31-71-400-001.
(c) Do the test given in Para. 3.
5. Close-up(1) Replace LGCIU-2 [5GA2] AMM 32-31-71-000-001 and AMM 32-31-71-400-001.
(a) Do the test given in Para. 3.
(2) If the fault continues:
(a) Remove the EIU-1 (1KS1) AMM 73-25-34-000-802.
(b) Remove the LGCIU-2 (5GA2) AMM 32-31-71-000-001.
(c) Test the circuits AWM 732557 and AWM 326106. Refer to table 1. Look for:
1 Wire-to-wire shorts
2 Shorts-to-ground
3 Continuity (less than 5 ohms resistance).
NOTE: A short-to-ground is found when the resistance is less than 100 000 (100K) ohms.
Table 1: LGCIU-2 Circuit Connector Contacts | LGCIU-2 (5GA2) Contacts | EIU-1 (1KS1) Connector AA Contacts |
|---|---|
| 13J | 14A |
| 15J | 15A |
(a) Repair or replace wiring AWM 732557.
(b) Install the EIU-1 (1KS1) AMM 73-25-34-400-802.
(c) Install the LGCIU-2 (5GA2) AMM 32-31-71-400-001.
(d) Do the test given in Para. 3.
(4) If you find no damage or if the fault continues:
(a) Replace EIU-1 [1KS1] AMM 73-25-34-000-802 and AMM 73-25-34-400-802.
(b) Install the LGCIU-2 (5GA2) AMM 32-31-71-400-001.
(c) Do the test given in Para. 3.
Subtask 73-25-00-860-180-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.