Loss of the Mode Transducer Signal for the Right Green Aileron Servo Control

TASK 27-10-00-810-822-A
Loss of the Mode Transducer Signal for the Right Green Aileron Servo Control

1. Possible Causes

ELAC-1 [2CE1]
MODE XDCR (LVDT)
wiring of the MODE XDCR SPLY signal from the servo control (33CE2) to the first terminal block
wiring of the MODE XDCR VS1, VS2 signal from the servo control (33CE2) to the ELAC 1 (2CE1)

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 27-90-00-810-809-A	Loss of the ACS2 Signal of the ELAC1 MON Side
AMM 27-14-51-000-005	Removal of the Linear Variable-Differential Transformer (LVDT) of the Aileron- Servo Control
AMM 27-14-51-400-005	Installation of the Linear Variable-Differential Transformer (LVDT) of the Aileron Servo-Control
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 27-10-00-700-083-A ** ON A/C NOT FOR ALL

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

Subtask 27-10-00-700-083-B ** 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 27-10-00-810-071-A ** ON A/C NOT FOR ALL

A. Do a check for maintenance messages on the POST FLIGHT REPORT (PFR)

NOTE: On ground, during a GROUND SCANNING, if a F/CTL maintenance status is shown without related associated maintenance messages, start the procedure at step A.(2)(a).

(1) If there are these maintenance messages:
R G AIL MODE XDCR 33CE2 OR INPUT OF ELAC1
L B AIL MODE XDCR 33CE3 OR INPUT OF ELAC1

Do this procedure (Ref. TSM TASK 27-90-00-810-809).

(2) If there is only this maintenance message:
R G AIL MODE XDCR 33CE2 OR INPUT OF ELAC1
(a) Replace the ELAC-1 [2CE1] , AMM 27-93-34-000-001 and AMM 27-93-34-400-001.
(b) On the panel 23VU, release and push the FLT CTL/ELAC 1 pushbutton switch.
(c) On the EWD, if the F/CTL AIL SERVO FAULT warning stays in view:

Replace the MODE XDCR (LVDT) of the aileron servo control (33CE2), AMM 27-14-51-000-005 and AMM 27-14-51-400-005.

NOTE: The resistance of the primary winding of the transducer (pins A/K and A/L) must be between 87 ohms and 105 ohms, the resistance of the secondary winding of the transducer (pins A/J and A/U) must be between 675 ohms and 825 ohms . The insulation must be more than 10 Mohms.
These values are given for information only. You can use these values to do checks of the component electrical part or of the wiring before you replace the component. This procedure does not do a check of the component mechanical part.
For the primary winding (power supply):

If you do the resistance check from the avionics compartment, you must disconnect the transducer of the left Blue aileron servo control.

(d) On the panel 23VU, release and push the FLT CTL/ELAC 1 pushbutton switch.
(e) On the EWD, if the F/CTL AIL SERVO FAULT warning stays in view:
1 Do a check of the wiring of the MODE XDCR SPLY signal from the servo control (33CE2) to the first terminal block, ASM 279302:

If there is no continuity, repair the wiring
If there is continuity, see Para. 2_.

2 Do a check and repair the wiring of the MODE XDCR VS1, VS2 signal from the servo control (33CE2) to the ELAC 1 (2CE1), ASM 279302.
(3) Do the troubleshooting procedure(s) related to other maintenance message(s).

Subtask 27-10-00-810-071-B ** ON A/C NOT FOR ALL

A. Procedure
(1) If the test gives these maintenance messages:
R G AIL MODE XDCR 33CE2 OR INPUT OF ELAC1
L B AIL MODE XDCR 33CE3 OR INPUT OF ELAC1

Do this procedure (Ref. TSM TASK 27-90-00-810-809).

(2) If the test gives only this maintenance message:
R G AIL MODE XDCR 33CE2 OR INPUT OF ELAC1
(a) Replace the ELAC-1 [2CE1] , AMM 27-93-34-000-001 and AMM 27-93-34-400-001.
(b) On the panel 23VU, release and push the FLT CTL/ELAC 1 pushbutton switch.
(c) On the EWD, if the F/CTL AIL SERVO FAULT warning stays in view:

Replace the MODE XDCR (LVDT) of the aileron servo control (33CE2), AMM 27-14-51-000-005 and AMM 27-14-51-400-005.

NOTE: The resistance of primary (pins A/K and A/L) and secondary (pins A/J and A/U) windings of the transducer must be between 30 ohms and 500 ohms.
These values are given for information only. You can use these values to do checks of the component electrical part or of the wiring before you replace the component. But by this procedure, the check of the component mechanical part is not done.
For primary winding (power supply):

If you do the resistance check from the avionics compartment, you must disconnect the transducer of the Left Blue Aileron Servo Control.

If there is no continuity, repair the wiring
If there is continuity, see Para. 2_.

2 Do a check and repair the wiring of the MODE XDCR VS1, VS2 signal from the servo control (33CE2) to the ELAC 1 (2CE1), ASM 279302.

Subtask 27-10-00-700-104-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

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