DOC AIRBUS | TSM A320FFailure of the Right Green Aileron Servo Control Servovalve
TASK 27-10-00-810-823-A
Failure of the Right Green Aileron Servo Control Servovalve
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 27-10-00-700-085-A ** ON A/C NOT FOR ALL
Subtask 27-10-00-810-072-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:27:27 UTC
Failure of the Right Green Aileron Servo Control Servovalve
1. Possible Causes
- servovalve of the servo control 33CE2
wiring POS XDCR signal from the servocontrol (33CE2) to the ELAC 1 (2CE1) COM and MON side - ELAC-1 [2CE1]
- SERVO CTL-R AILERON, INBD G [33CE2]
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| TSM TASK 27-93-00-810-950-A | Disagree between COM and MON Aileron Order Signals in the ELAC1 |
| AMM 27-14-51-000-001 | Removal of the Aileron Servo Control |
| AMM 27-14-51-000-003 | Removal of the Aileron Servo-Control Servovalve |
| AMM 27-14-51-400-001 | Installation of the Aileron Servo Control |
| AMM 27-14-51-400-003 | Installation of the Aileron Servo-Control Servovalve |
| 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 27-10-00-700-085-A ** ON A/C NOT FOR ALL
A. Test
(1) Not applicable, you cannot confirm this fault on the ground.
Subtask 27-10-00-700-085-B ** ON A/C NOT FOR ALL (1) 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.
Subtask 27-10-00-700-085-C ** ON A/C NOT FOR ALL (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. Test
(1) Do a check of the Post Flight Report (PFR)
If the R G AIL SERVO VLV 33CE2 maintenance message is shown in flight phase 08 (PH08):
(a) On the overhead panel, on the FLT CTL panel 23VU: release, then push the FLT CTL/ELAC1 pushbutton switch.
(b) Make an entry in the logbook to monitor the aircraft during the subsequent flight.
(c) During the subsequent flight:
(3) Do the BITE test of the EFCS (ground scanning) AMM 27-96-00-740-001.
Subtask 27-10-00-700-085-D ** ON A/C NOT FOR ALL (1) Do a check of the Post Flight Report (PFR)
If the R G AIL SERVO VLV 33CE2 maintenance message is shown in flight phase 08 (PH08):
(a) On the overhead panel, on the FLT CTL panel 23VU: release, then push the FLT CTL/ELAC1 pushbutton switch.
(b) Make an entry in the logbook to monitor the aircraft during the subsequent flight.
(c) During the subsequent flight:
- If the fault occurs again, continue the trouble shooting procedure.
(3) Do the BITE test of the EFCS (ground scanning) AMM 27-96-00-740-001.
A. Test
(1) Do a check of the Post Flight Report (PFR)
If the R G AIL SERVO VLV 33CE2 maintenance message is shown in flight phase 08 (PH08):
(a) On the overhead panel, on the FLT CTL panel 23VU: release, then push the FLT CTL/ELAC1 pushbutton switch.
(b) Make an entry in the logbook to monitor the aircraft during the subsequent flight.
(c) During the subsequent flight:
4. Fault Isolation(1) Do a check of the Post Flight Report (PFR)
If the R G AIL SERVO VLV 33CE2 maintenance message is shown in flight phase 08 (PH08):
(a) On the overhead panel, on the FLT CTL panel 23VU: release, then push the FLT CTL/ELAC1 pushbutton switch.
(b) Make an entry in the logbook to monitor the aircraft during the subsequent flight.
(c) During the subsequent flight:
- If the fault occurs again, continue the trouble shooting procedure.
Subtask 27-10-00-810-072-A ** ON A/C NOT FOR ALL
A. Do a check of the Previous Leg Reports (PLR) to see if there is the ELAC1 AIL ORDER DISAGREE maintenance message:
(1) If this maintenance message is shown, refer to the trouble shooting procedure (Ref. TSM TASK 27-93-00-810-950).
(2) If this maintenance message is not shown:
Subtask 27-10-00-810-072-B ** ON A/C NOT FOR ALL (1) If this maintenance message is shown, refer to the trouble shooting procedure (Ref. TSM TASK 27-93-00-810-950).
(2) If this maintenance message is not shown:
- Replace the servovalve of the servo control 33CE2 , AMM 27-14-51-000-003 and AMM 27-14-51-400-003.
- At the 33CE2 receptacle, do a check of the resistance between pin E and pin F ASM 279302.
NOTE: The resistance must be 500 ohms +/- 10 %.
(3) If the fault continues: - Do a check of the
wiring POS XDCR signal from the servocontrol (33CE2) to the ELAC 1 (2CE1) COM and MON side , ASM 279302.
- Replace the ELAC-1 [2CE1] , AMM 27-93-34-000-001 and AMM 27-93-34-400-001.
- Replace the SERVO CTL-R AILERON, INBD G [33CE2] , AMM 27-14-51-000-001 and AMM 27-14-51-400-001.
A. If the test gives the maintenance message:
R G AIL SERVO VLV 33CE2
(1) Do a check of the Previous Leg Reports (PLR) to see if there is the ELAC1 AIL ORDER DISAGREE maintenance message:
(a) If this maintenance message is shown, refer to the trouble shooting procedure (Ref. TSM TASK 27-93-00-810-950).
(b) If this maintenance message is not shown:
Subtask 27-10-00-700-086-A ** ON A/C NOT FOR ALL R G AIL SERVO VLV 33CE2
(1) Do a check of the Previous Leg Reports (PLR) to see if there is the ELAC1 AIL ORDER DISAGREE maintenance message:
(a) If this maintenance message is shown, refer to the trouble shooting procedure (Ref. TSM TASK 27-93-00-810-950).
(b) If this maintenance message is not shown:
- Replace the servovalve of the servo control 33CE2 , AMM 27-14-51-000-003 and AMM 27-14-51-400-003.
- At the 33CE2 receptacle, do a check of the resistance between pin E and pin F ASM 279302.
NOTE: The resistance must be 500 ohms +/- 10 %.
(2) If the fault continues: - do a check of the
wiring POS XDCR signal from the servocontrol (33CE2) to the ELAC 1 (2CE1) COM and MON side , ASM 279302.
- replace the ELAC-1 [2CE1] , AMM 27-93-34-000-001 and AMM 27-93-34-400-001.
- replace the SERVO CTL-R AILERON, INBD G [33CE2] , AMM 27-14-51-000-001 and AMM 27-14-51-400-001.
B. Do the test given in Para. 3.