DOC AIRBUS | TSM A320FLoss of the ACS1 of the ELAC1 COM and MON Sides
TASK 27-90-00-810-813-A
Loss of the ACS1 of the ELAC1 COM and MON Sides
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
3. Fault Confirmation
Subtask 27-90-00-740-073-A 4. Fault Isolation
Subtask 27-90-00-810-062-A
[Rev.8 from Aug 2018]
2026.04.04 04:27:52 UTC
Loss of the ACS1 of the ELAC1 COM and MON Sides
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| TSM TASK 27-90-00-810-811-A | Loss of the ACS1 Signal of the ELAC1 COM Side |
| TSM TASK 27-90-00-810-812-A | Loss of the ACS1 Signal of the ELAC1 MON Side |
| AMM 27-93-34-000-001 | Removal of the ELAC |
| AMM 27-93-34-400-001 | Installation of the ELAC |
| AMM 27-94-34-000-001 | Removal of the SEC |
| AMM 27-94-34-400-001 | Installation of the SEC |
| AMM 27-96-00-740-001 | BITE Test of the EFCS (Ground Scanning) |
Subtask 27-90-00-740-073-A 4. Fault Isolation
Subtask 27-90-00-810-062-A
A. If the ground scanning gives at least two maintenance messages of the two lists below:
First list:
Combination of maintenance messages of the first list, do this trouble shooting procedure (Ref. TSM TASK 27-90-00-810-811).
(2) Second case:
Combination of maintenance messages of the second list, do this trouble shooting procedure (Ref. TSM TASK 27-90-00-810-812).
(3) Third case:
Combination of maintenance messages of the first and second lists:
Subtask 27-90-00-740-074-A First list:
- ELAC1 COM OR WIRING FROM THS ACTR XDCR2 9CE
- ELAC1 OR WIRING FROM L B ELEV POS XDCR 34CE3
- ELAC1 OR WIRING FROM R B ELEV POS XDCR 34CE4
Second list: - ELAC1 MON OR WIRING FROM THS ACTR XDCR2 9CE
- ELAC1 OR WIRING FROM L ELEV POS MON XDCR
- ELAC1 OR WIRING FROM R ELEV POS MON XDCR
- ELAC1 OR WIRING FROM L G ELEV MODE XDCR 34CE1
- ELAC1 OR WIRING FROM R Y ELEV MODE XDCR 34CE2
Combination of maintenance messages of the first list, do this trouble shooting procedure (Ref. TSM TASK 27-90-00-810-811).
(2) Second case:
Combination of maintenance messages of the second list, do this trouble shooting procedure (Ref. TSM TASK 27-90-00-810-812).
(3) Third case:
Combination of maintenance messages of the first and second lists:
- replace the ELAC-1 [2CE1] AMM 27-93-34-000-001 and AMM 27-93-34-400-001.
NOTE: To help the trouble shooting of the ELAC in the workshop, put a label with the indication: "failure of internal relays K20 and K21".
- replace the SEC-1 [1CE1] AMM 27-94-34-000-001 AMM 27-94-34-400-001.
B. Do the test given in Para. 3.