DOC AIRBUS | TSM A320FLoss of the Mode Transducer Signal for the Left Green Aileron Servo Control
TASK 27-10-00-810-816-A
Loss of the Mode Transducer Signal for the Left Green Aileron Servo Control
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 27-10-00-700-073-A
Subtask 27-10-00-810-065-A
[Rev.8 from Aug 2018]
2026.04.04 04:27:27 UTC
Loss of the Mode Transducer Signal for the Left Green Aileron Servo Control
1. Possible Causes
- ELAC-2 [2CE2]
MODE XDCR (LVDT) wiring of the MODE XDCR SPLY signal from the servo control (33CE1) to the first terminal block wiring of the MODE XDCR VS1, VS2 signal from the servo control (33CE1) to the ELAC 2 (2CE2)
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| TSM TASK 27-90-00-810-810-A | Loss of the ACS2 Signal of the ELAC2 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 279303 | |
| 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 27-10-00-700-073-A
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.
(a) If the ground scanning gives the maintenance message:
L G AIL MODE XDCR 33CE1 OR INPUT OF ELAC 2
L G AIL MODE XDCR 33CE1 OR INPUT OF ELAC 2
R B AIL MODE XDCR 33CE4 OR INPUT OF ELAC 2
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.
(a) If the ground scanning gives the maintenance message:
L G AIL MODE XDCR 33CE1 OR INPUT OF ELAC 2
- refer to the Para. Fault Isolation.
L G AIL MODE XDCR 33CE1 OR INPUT OF ELAC 2
R B AIL MODE XDCR 33CE4 OR INPUT OF ELAC 2
- refer to this procedure (Ref. TSM TASK 27-90-00-810-810).
Subtask 27-10-00-810-065-A
A. If the test gives the maintenance message:
L G AIL MODE XDCR 33CE1 OR INPUT OF ELAC 2
(a) Do a check of thewiring of the MODE XDCR SPLY signal from the servo control (33CE1) to the first terminal block , ASM 279303:
wiring of the MODE XDCR VS1, VS2 signal from the servo control (33CE1) to the ELAC 2 (2CE2) , ASM 279303.
Subtask 27-10-00-700-074-A L G AIL MODE XDCR 33CE1 OR INPUT OF ELAC 2
- Replace the ELAC-2 [2CE2] , AMM 27-93-34-000-001 and AMM 27-93-34-400-001.
- Replace the
MODE XDCR (LVDT) of the aileron servo control (33CE1), 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. But by this procedure, the check of the component mechanical part is not done.
For primary winding (power supply):
(2) If the fault continues: 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 Right Blue Aileron Servo Control.
(a) Do a check of the
- If there is no continuity, repair the wiring
- If there is continuity, see Para. (b).
B. Do the test given in Para. 3.