DOC AIRBUS | TSM A320FFluctuation of the Pointer of the RUD Indicator on the lower ECAM DU.
TASK 27-20-00-810-806-A
Fluctuation of the Pointer of the RUD Indicator on the lower ECAM DU.
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
3. Fault Confirmation
Subtask 27-20-00-700-051-A
Subtask 27-20-00-865-051-A
[Rev.8 from Aug 2018]
2026.04.04 04:27:29 UTC
Fluctuation of the Pointer of the RUD Indicator on the lower ECAM DU.
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| TSM TASK 31-32-00-810-933-A | Failure of the Analog Links |
| AMM 27-25-17-000-001 | Removal of the Rudder Position Transducer Unit 42WV |
| AMM 27-25-17-400-001 | Installation of the Rudder Position Transducer Unit 42WV |
| ASM 315404 | |
| ASM 315408 | |
| AMM 31-55-34-000-001 | Removal of the SDAC |
| AMM 31-55-34-400-001 | Installation of the SDAC |
| AMM 31-63-34-000-001 | Removal of the DMC |
| AMM 31-63-34-400-001 | Installation of the DMC |
Subtask 27-20-00-700-051-A
A. Not applicable, the fault is evident on the F/CTL page of the lower ECAM DU.
4. Fault IsolationSubtask 27-20-00-865-051-A
A. Table of the circuit breakers used in this procedure:
Subtask 27-20-00-810-055-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | SDAC/1/SPLY | 3WV | F04 |
| 49VU | SDAC/2/26VAC SYNC/AC ESS BUS | 6WV | F03 |
| 121VU | EIS/SDAC1 AND 2/BUS2/28VDC | 44WV | P03 |
| 121VU | EIS/SDAC/2/SPLY | 2WV | Q06 |
| 121VU | EIS/SDAC/1/BUS2/26VAC SYNC AC | 7WV | Q03 |
| 121VU | EIS/SDAC/2/BUS2/26VAC SYNC AC | 8WV | Q02 |
B. If there are fluctuations of the pointer of the RUD indicator on the F/CTL page:
(1) Open the circuit breakers 3WV, 7WV and 44WV.
(a) If the fluctuations of the pointer continue:
(3) Open the circuit breakers 2WV, 6WV, 8WV and 44WV.
(a) If the fluctuations of the pointer continue:
(5) On the center pedestal, on the switching panel, set the EIS DMC switch to F/O/3.
(a) If the fluctuations of the pointer continue:
Subtask 27-20-00-810-055-B ** ON A/C NOT FOR ALL (1) Open the circuit breakers 3WV, 7WV and 44WV.
(a) If the fluctuations of the pointer continue:
- see para.(2).
- replace the SDAC-1 [1WV1] AMM 31-55-34-000-001 and AMM 31-55-34-400-001.
- do a check of the wiring from the SDAC 1 to the first terminal block ASM 315408 (RUD POS XDCR unit side).
- do a check of the wiring from the SDAC 1 to the first terminal block ASM 315404 (DMC side).
(3) Open the circuit breakers 2WV, 6WV, 8WV and 44WV.
(a) If the fluctuations of the pointer continue:
- see para.(5).
- replace the SDAC-2 [1WV2] AMM 31-55-34-000-001 and AMM 31-55-34-400-001.
- do a check of the wiring from the SDAC 2 to the first terminal block ASM 315404 (RUD POS XDCR unit side).
- do a check of the wiring from the SDAC 2 to the first terminal block ASM 315404 (DMC side).
(5) On the center pedestal, on the switching panel, set the EIS DMC switch to F/O/3.
(a) If the fluctuations of the pointer continue:
- replace the XDCR UNIT-RUDDER POS [42WV] AMM 27-25-17-000-001 and AMM 27-25-17-400-001.
- do a check of the wiring between the circuit breaker 5WV and the RUD POS XDCR unit 42WV ASM 315408.
- do a check of the wiring from the RUD POS XDCR unit to the first terminal block ASM 315408.
- do the trouble shooting (Ref. TSM TASK 31-32-00-810-933) related to the ANI signal of the SDACs.
- replace the DMC-2 [1WT2] AMM 31-63-34-000-001 and AMM 31-63-34-400-001.
- do a check of the wiring from the DMC 2 to the first terminal block ASM 315404 (SDAC 1 side).
- do a check and repair the wiring from the DMC 2 to the first terminal block ASM 315404 (SDAC 2 side).
B. If there are fluctuations of the pointer of the RUD indicator on the F/CTL page:
(1) Open the circuit breakers 3WV, 7WV and 44WV.
(a) If the fluctuations of the pointer continue:
(3) Open the circuit breakers 2WV, 6WV, 8WV and 44WV.
(a) If the fluctuations of the pointer continue:
(5) On the center pedestal, on the switching panel, set the EIS DMC switch to F/O/3.
(a) If the fluctuations of the pointer continue:
(1) Open the circuit breakers 3WV, 7WV and 44WV.
(a) If the fluctuations of the pointer continue:
- see para.(2).
- replace the SDAC-1 [1WV1] AMM 31-55-34-000-001 and AMM 31-55-34-400-001.
- do a check of the wiring from the SDAC 1 to the first terminal block ASM 315408 (RUD POS XDCR unit side).
- do a check of the wiring from the SDAC 1 to the first terminal block ASM 315404 (DMC side).
(3) Open the circuit breakers 2WV, 6WV, 8WV and 44WV.
(a) If the fluctuations of the pointer continue:
- see para.(5).
- replace the SDAC-2 [1WV2] AMM 31-55-34-000-001 and AMM 31-55-34-400-001.
- do a check of the wiring from the SDAC 2 to the first terminal block ASM 315404 (RUD POS XDCR unit side).
- do a check of the wiring from the SDAC 2 to the first terminal block ASM 315404 (DMC side).
(5) On the center pedestal, on the switching panel, set the EIS DMC switch to F/O/3.
(a) If the fluctuations of the pointer continue:
- replace the XDCR UNIT-RUDDER POS [42WV] AMM 27-25-17-000-001 and AMM 27-25-17-400-001.
- do a check of the wiring between circuit breaker 5WV and the RUD POS XDCR unit 42WV ASM 315408.
- do a check of the wiring from the RUD POS XDCR unit to the first terminal block ASM 315408.
- do the trouble shooting procedure (Ref. TSM TASK 31-32-00-810-933) related to the ANI signal of the SDACs.
- replace the DMC-1 [1WT1] AMM 31-63-34-000-001 and AMM 31-63-34-400-001.
- do a check of the wiring from the DMC 1 to the first terminal block ASM 315404 (SDAC 1 side).
- do a check and repair the wiring from the DMC 1 to the first terminal block ASM 315404 (SDAC 2 side).