DOC AIRBUS | TSM A320FLoss of the ACS2 Signal of the ELAC1 COM Side
TASK 27-90-00-810-807-A
Loss of the ACS2 Signal of the ELAC1 COM Side
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 27-90-00-740-060-A ** ON A/C NOT FOR ALL
Subtask 27-90-00-810-056-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:27:52 UTC
Loss of the ACS2 Signal of the ELAC1 COM Side
1. Possible Causes
- ELAC-1 [2CE1]
- wiring of the ACS2 signal from the ELAC1 COM side to the first terminal block
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| TSM TASK 27-90-00-810-801-A | Failure of an Alternating Current Supply (ACS) |
| ASM 279302 | |
| AMM 27-93-34-000-001 | Removal of the ELAC |
| AMM 27-93-34-400-001 | Installation of the ELAC |
| AMM 27-96-00-710-020 | Operational Test of the Side Stick Assembly (Activation for the BITE Test) |
| AMM 27-96-00-740-001 | BITE Test of the EFCS (Ground Scanning) |
Subtask 27-90-00-740-060-A ** ON A/C NOT FOR ALL
A. Test
Not applicable, you cannot confirm this fault on the ground.
Subtask 27-90-00-740-060-B ** ON A/C NOT FOR ALL Not applicable, you cannot confirm this fault on the ground.
A. Test
(1) Do the operational test of the side stick assembly (activation for the BITE test) AMM 27-96-00-710-020.
(2) Do the BITE test of the EFCS (ground scanning) AMM 27-96-00-740-001.
4. Fault Isolation(1) Do the operational test of the side stick assembly (activation for the BITE test) AMM 27-96-00-710-020.
(2) Do the BITE test of the EFCS (ground scanning) AMM 27-96-00-740-001.
Subtask 27-90-00-810-056-A ** ON A/C NOT FOR ALL
A. If the POST FLIGHT REPORT (PFR) gives the maintenance messages:
L B AIL POS XDCR 33CE3
and
R G AIL POS XDCR 33CE2
(a) If the resistance values are in the specified limits:
1 Do the trouble shooting procedure (Ref. TSM TASK 27-90-00-810-801).
2 Replace the ELAC-1 [2CE1] AMM 27-93-34-000-001 and AMM 27-93-34-400-001.
(c) If the resistance is more than 250 ohms:
1 Do a check and repair the wiring of the ACS2 signal from the ELAC1 COM side to the first terminal block ASM 279302.
2 Install the ELAC1 AMM 27-93-34-400-001.
Subtask 27-90-00-810-056-B ** ON A/C NOT FOR ALL L B AIL POS XDCR 33CE3
and
R G AIL POS XDCR 33CE2
- remove the ELAC1 AMM 27-93-34-000-001.
(a) If the resistance values are in the specified limits:
- replace the ELAC-1 [2CE1] AMM 27-93-34-000-001 and AMM 27-93-34-400-001.
1 Do the trouble shooting procedure (Ref. TSM TASK 27-90-00-810-801).
2 Replace the ELAC-1 [2CE1] AMM 27-93-34-000-001 and AMM 27-93-34-400-001.
(c) If the resistance is more than 250 ohms:
1 Do a check and repair the wiring of the ACS2 signal from the ELAC1 COM side to the first terminal block ASM 279302.
2 Install the ELAC1 AMM 27-93-34-400-001.
A. If the test gives the maintenance messages:
L B AIL POS XDCR 33CE3
and
R G AIL POS XDCR 33CE2
(a) If the resistance values are in the specified limits:
1 Do the trouble shooting procedure (Ref. TSM TASK 27-90-00-810-801).
2 Replace the ELAC-1 [2CE1] AMM 27-93-34-000-001 and AMM 27-93-34-400-001.
(c) If the resistance is more than 250 ohms:
1 Do a check and repair the wiring of the ACS2 signal from the ELAC1 COM side to the first terminal block ASM 279302.
2 Install the ELAC1 AMM 27-93-34-400-001.
Subtask 27-90-00-740-097-A ** ON A/C NOT FOR ALL L B AIL POS XDCR 33CE3
and
R G AIL POS XDCR 33CE2
- remove the ELAC1 AMM 27-93-34-000-001.
(a) If the resistance values are in the specified limits:
- replace the ELAC-1 [2CE1] AMM 27-93-34-000-001 and AMM 27-93-34-400-001.
1 Do the trouble shooting procedure (Ref. TSM TASK 27-90-00-810-801).
2 Replace the ELAC-1 [2CE1] AMM 27-93-34-000-001 and AMM 27-93-34-400-001.
(c) If the resistance is more than 250 ohms:
1 Do a check and repair the wiring of the ACS2 signal from the ELAC1 COM side to the first terminal block ASM 279302.
2 Install the ELAC1 AMM 27-93-34-400-001.
B. Do the test given in Para. 3.