Loss of the ACS2 Signal of the ELAC1 MON Side

TASK 27-90-00-810-809-A
Loss of the ACS2 Signal of the ELAC1 MON Side

1. Possible Causes

ELAC-1 [2CE1]
wiring of the ACS2 signal from the ELAC1 MON side to the first terminal block

2. Job Set-up Information
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)

3. Fault Confirmation
Subtask 27-90-00-740-064-A ** ON A/C NOT FOR ALL

A. Test
Not applicable, you cannot confirm this fault on the ground.

Subtask 27-90-00-740-064-C ** ON A/C NOT FOR ALL

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
Subtask 27-90-00-810-058-A ** ON A/C NOT FOR ALL

A. If the POST FLIGHT REPORT (PFR) gives the maintenance messages:
L B AIL MODE XDCR 33CE3 OR INPUT OF ELAC1
and
R G AIL MODE XDCR 33CE4 OR INPUT OF ELAC1

remove the ELAC1 AMM 27-93-34-000-001.

(1) At the ELAC1 receptacle, do a check of the resistance and of the insulation between the pin AD/2C and the pin AD/2D (15 to 250 ohms) ASM 279302.
(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.

(b) If the resistance is less than 15 ohms:
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 MON side to the first terminal block ASM 279302.
2 Install the ELAC1 AMM 27-93-34-400-001.

Subtask 27-90-00-810-058-B ** ON A/C NOT FOR ALL

A. If the test gives the maintenance messages:
L B AIL MODE XDCR 33CE3 OR INPUT OF ELAC1
and
R G AIL MODE XDCR 33CE4 OR INPUT OF ELAC1

remove the ELAC1 AMM 27-93-34-000-001.

replace the ELAC-1 [2CE1] AMM 27-93-34-000-001 and AMM 27-93-34-400-001.

Subtask 27-90-00-740-098-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:27:52 UTC