DOC AIRBUS | TSM A320FLoss of the Signal of the Right Blue Elevator-Servocontrol Position-Transducer by the ELAC 1
TASK 27-93-00-810-871-A
Loss of the Signal of the Right Blue Elevator-Servocontrol Position-Transducer by the ELAC 1
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 27-93-00-700-126-A
Subtask 27-93-00-810-118-A
[Rev.8 from Aug 2018]
2026.04.04 04:28:00 UTC
Loss of the Signal of the Right Blue Elevator-Servocontrol Position-Transducer by the ELAC 1
1. Possible Causes
- ELAC-1 [2CE1]
wiring of the POS XDCR COM (ANI 2-2) signal from the ELAC 1 (2CE1) to the first terminal block - SERVO CTL-R ELEVATOR, OUTBD B [34CE4]
- SERVO CTL-R ELEVATOR, INBD Y [34CE2]
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| TSM TASK 27-30-00-810-848-A | Elevator Damping Test Not Possible |
| TSM TASK 27-90-00-810-811-A | Loss of the ACS1 Signal of the ELAC1 COM Side |
| TSM TASK 27-90-00-810-812-A | Loss of the ACS1 Signal of the ELAC1 MON Side |
| TSM TASK 27-90-00-810-813-A | Loss of the ACS1 of the ELAC1 COM and MON Sides |
| AMM 27-34-00-710-001 | Operational Test of the Elevator and Hydraulic Actuation |
| AMM 27-34-51-000-001 | Removal of the Elevator Servo Control |
| AMM 27-34-51-400-001 | Installation of the Elevator Servo Control |
| ASM 279307 | |
| AMM 27-93-34-000-001 | Removal of the ELAC |
| AMM 27-93-34-400-001 | Installation of the ELAC |
| AMM 27-96-00-710-008 | Operational Test of the Damping Measurement (Elevator) |
| 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 27-93-00-700-126-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:
ELAC1 OR WIRING FROM R B ELEV POS XDCR 34CE4
First list:
Combination of maintenance messages of the first list, do this trouble shooting procedure (Ref. TSM TASK 27-90-00-810-811).
2 Second case:
Combination of maintenance messages of the second list, do this trouble shooting procedure (Ref. TSM TASK 27-90-00-810-812).
3 Third case:
Combination of maintenance messages of the first and second lists, do this trouble shooting procedure (Ref. TSM TASK 27-90-00-810-813).
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:
ELAC1 OR WIRING FROM R B ELEV POS XDCR 34CE4
- refer to Para. Fault Isolation.
First list:
- ELAC1 COM OR WIRING FROM THS ACTR XDCR2 9CE
- ELAC1 OR WIRING FROM L B ELEV POS XDCR 34CE3
- ELAC1 OR WIRING FROM R B ELEV POS XDCR 34CE4
Second list: - ELAC1 MON OR WIRING FROM THS ACTR XDCR2 9CE
- ELAC1 OR WIRING FROM L ELEV POS MON XDCR
- ELAC1 OR WIRING FROM R ELEV POS MON XDCR
- ELAC1 OR WIRING FROM L G ELEV MODE XDCR 34CE1
- ELAC1 OR WIRING FROM R Y ELEV MODE XDCR 34CE2
Combination of maintenance messages of the first list, do this trouble shooting procedure (Ref. TSM TASK 27-90-00-810-811).
2 Second case:
Combination of maintenance messages of the second list, do this trouble shooting procedure (Ref. TSM TASK 27-90-00-810-812).
3 Third case:
Combination of maintenance messages of the first and second lists, do this trouble shooting procedure (Ref. TSM TASK 27-90-00-810-813).
Subtask 27-93-00-810-118-A
A. If the test gives the maintenance message:
ELAC1 OR WIRING FROM R B ELEV POS XDCR 34CE3
(a) Do the operational test of the elevator and hydraulic actuation AMM 27-34-00-710-001:
1 If the travel speed of the right elevator is less than the travel speed of the left elevator:
a Replace the SERVO CTL-R ELEVATOR, OUTBD B [34CE4] AMM 27-34-51-000-001 AMM 27-34-51-400-001.
b If the travel speed of the right elevator is again less than the travel speed of the left elevator, replace the SERVO CTL-R ELEVATOR, INBD Y [34CE2] AMM 27-34-51-000-001 AMM 27-34-51-400-001.
2 If the two elevators move with the same travel speeds, continue this procedure (para.(b)).
(b) Do a damping test AMM 27-96-00-710-008:
1 If the ELEV TEST NOT POSSIBLE message is shown, do the trouble shooting procedure (Ref. TSM TASK 27-30-00-810-848).
2 If the R ELEV TEST OK message is shown and the damping factor of one elevator servocontrol is higher than 1:
a Replace the SERVO CTL-R ELEVATOR, OUTBD B [34CE4] AMM 27-34-51-000-001 AMM 27-34-51-400-001.
b If the R ELEV TEST OK message is shown and the damping factors of two elevator servocontrols are again higher than 1: replace the SERVO CTL-R ELEVATOR, INBD Y [34CE2] AMM 27-34-51-000-001 AMM 27-34-51-400-001.
Subtask 27-93-00-700-127-A ELAC1 OR WIRING FROM R B ELEV POS XDCR 34CE3
- Replace the ELAC-1 [2CE1] AMM 27-93-34-000-001 and AMM 27-93-34-400-001.
- Do a check and repair the
wiring of the POS XDCR COM (ANI 2-2) signal from the ELAC 1 (2CE1) to the first terminal block ASM 279307.
(a) Do the operational test of the elevator and hydraulic actuation AMM 27-34-00-710-001:
1 If the travel speed of the right elevator is less than the travel speed of the left elevator:
a Replace the SERVO CTL-R ELEVATOR, OUTBD B [34CE4] AMM 27-34-51-000-001 AMM 27-34-51-400-001.
b If the travel speed of the right elevator is again less than the travel speed of the left elevator, replace the SERVO CTL-R ELEVATOR, INBD Y [34CE2] AMM 27-34-51-000-001 AMM 27-34-51-400-001.
2 If the two elevators move with the same travel speeds, continue this procedure (para.(b)).
(b) Do a damping test AMM 27-96-00-710-008:
1 If the ELEV TEST NOT POSSIBLE message is shown, do the trouble shooting procedure (Ref. TSM TASK 27-30-00-810-848).
2 If the R ELEV TEST OK message is shown and the damping factor of one elevator servocontrol is higher than 1:
- replace this elevator servocontrol AMM 27-34-51-000-001 AMM 27-34-51-400-001.
a Replace the SERVO CTL-R ELEVATOR, OUTBD B [34CE4] AMM 27-34-51-000-001 AMM 27-34-51-400-001.
b If the R ELEV TEST OK message is shown and the damping factors of two elevator servocontrols are again higher than 1: replace the SERVO CTL-R ELEVATOR, INBD Y [34CE2] AMM 27-34-51-000-001 AMM 27-34-51-400-001.
B. Do the tests given in Para. 3.