TSM 27-93-00-810-896-A — Failure of ELAC1 A320

Failure of ELAC1 A320

NOTE:   If the fault appears at electrical power up, do first the TSM task 27-93-00-810-964 (ELAC Fault at Electrical Power Up) for:

— ELACs L91/ L93/ L94 (PN 3945129101/ PN 3945129103/ PN 3945129104) or

— ELAC L92 (PN 3945128208) or

— ELAC L93 (PN 3945128209) or

— ELAC L94 (PN 3945128210).

1. Possible Causes:

2. Job Set-up Information

3. Fault Confirmation

SUBTASK 27-93-00-860-100-A

A.           Side Stick Identification

(1) Do the identification of the side stick installed on the aircraft Ref. AMM 27-92-41-860-801.

SUBTASK 27-93-00-710-071-A

B. Test(s)

(1) Energize the aircraft electrical circuits Ref. AMM 24-41-00-861-002.

(2) Make sure that the hydraulic systems are depressurized

(3) Start the Electronic Instrument System (EIS) to access to the Electronic Centralized Aircraft Monitoring (ECAM).

(4) On the overhead panel, on FLT CTL panel 23VU:

— Release the ELAC 1 pushbutton switch (the OFF legend comes on).

(5) On the overhead panel, on FLT CTL panel 23VU:

— Push the ELAC 1 pushbutton switch (the OFF legend goes off).

NOTE: In case of a reset of the ELAC 1 with the circuit breaker, the supply breaking must be more than 5 seconds.

NOTE: If the ELAC FAULT warning disappears after several resets, replace the computer.

(6) Do the BITE test of the EFCS (Ground Scanning) Ref. AMM 27-96-00-740-001.

(7) Do a check of the Post Flight Report (PFR) and the Previous Leg Report (PLR):

(a) If the «ELAC1 OR INPUT OF CAPT ROLL CTL SSTU 4CE1» maintenance message is recorded, do the associated troubleshooting procedure Ref. TSM TASK 27-93-00-810-801.

(b) If the «ELAC1 OR INPUT OF CAPT PITCH CTL SSTU 4CE3» maintenance message is recorded, do the associated troubleshooting procedure Ref. TSM TASK 27-93-00-810-803.

(c) If the «ELAC2 OR INPUT OF CAPT ROLL CTL SSTU 4CE1» maintenance message is recorded, do the associated troubleshooting procedure Ref. TSM TASK 27-93-00-810-805.

(d) If the «ELAC2 OR INPUT OF CAPT PITCH CTL SSTU 4CE3» maintenance message is recorded, do the associated troubleshooting procedure Ref. TSM TASK 27-93-00-810-807.

(e) If the «ELAC1 OR INPUT OF F/O ROLL CTL SSTU 4CE2» maintenance message is recorded, do the associated troubleshooting procedure Ref. TSM TASK 27-93-00-810-802.

(f) If the «ELAC1 OR INPUT OF F/O PITCH CTL SSTU 4CE4» maintenance message is recorded, do the associated troubleshooting procedure Ref. TSM TASK 27-93-00-810-804.

(g) If the «ELAC2 OR INPUT OF F/O ROLL CTL SSTU 4CE2» maintenance message is recorded, do the associated troubleshooting procedure Ref. TSM TASK 27-93-00-810-806.

(h) If the «ELAC2 OR INPUT OF F/O PITCH CTL SSTU 4CE4» maintenance message is recorded, do the associated troubleshooting procedure Ref. TSM TASK 27-93-00-810-808.

(i) If there is no maintenance message related to the Side Stick Transducer Unit (SSTU), continue this procedure.

4. Fault Isolation

SUBTASK 27-93-00-810-291-P

A. If the test confirms the fault:

— Do the operational test of the ELACs Ref. AMM 27-93-00-710-001 to make sure that ELAC1 operates its associated surfaces.

(1) If the flight controls move according to the ELAC1 servoing:

(a) Remove ELAC1 Ref. AMM 27-93-34-000-001.

(b) At ELAC1 receptacle, do a check of the resistance between pin AB/11J and pin AE/14C Ref. ASM 27-92-03.

1 If the resistance is less than 280 ohms:

a            Remove the relay (40CE1) Ref. AIPC 27-92-08-03.

b             Do a check of the resistance of the relay between pin X1 and pin X2 Ref. ASM 27-92-03.

— If the resistance is less than 280 ohms:

. Replace the RELAY-ELAC 1 ANN SPLY (40CE1) Ref. AIPC 27-92-08-03.

. Install a new ELAC-1 (2CE1) Ref. AMM 27-93-34-400-001.

— If the resistance is between 280 and 400 ohms:

. Do a check and repair the wiring of the RLY ELAC FAULT signal from the relay to ELAC1 Ref. ASM 27-92-03.

. Install the relay (40CE1) Ref. AIPC 27-92-08-03.

. Install a new ELAC-1 (2CE1) Ref. AMM 27-93-34-400-001.

2 If the resistance is more than 400 ohms:

a             Remove the relay (40CE1) Ref. AIPC 27-92-08-03.

b             Do a check of the resistance of the relay between pins X1 and X2 Ref. ASM 27-92-03.

— If the resistance is more than 400 ohms:

. Replace the RELAY-ELAC 1 ANN SPLY (40CE1) Ref. AIPC 27-92-08-03.

. Install ELAC1 Ref. AMM 27-93-34-400-001.

— If the resistance is between 280 and 400 ohms:

. Do a check and repair the wiring of the RLY ELAC FAULT signal from the relay to ELAC1 Ref. ASM 27-92-03.

. Install the relay (40CE1) Ref. AIPC 27-92-08-03.

. Install ELAC1 Ref. AMM 27-93-34-400-001.

3 If the resistance is between 280 and 400 ohms:

a Remove FCDC1 Ref. AMM 27-95-34-000-001.

— If the warning ELAC1 stays in view:

. Install FCDC1 Ref. AMM 27-95-34-400-001.

. Continue the trouble shooting at Para. b_.

— If the warning ELAC1 goes out of view, replace FCDC-1 (3CE1) Ref. AMM 27-95-34-000-001 and Ref. AMM 27-95-34-400-001.

— Install ELAC1 Ref. AMM 27-93-34-400-001.

b Remove FCDC2 Ref. AMM 27-95-34-000-001.

— If the warning ELAC1 stays in view:

. Install FCDC2 Ref. AMM 27-95-34-400-001.

. Continue the trouble shooting at Para. c_.

—              If the warning ELAC1 goes out of view, replace FCDC-2 (3CE2) Ref. AMM 27-95-34-000-001 and Ref. AMM 27-95-34-400-001.

—              Install ELAC1 Ref. AMM 27-93-34-400-001.

c              Remove the relay (40CE1) Ref. AIPC 27-92-08-03.

—              If the warning ELAC1 stays in view:

. Install the relay (40CE1) Ref. AIPC 27-92-08-03.

. Continue the trouble shooting at Para. d_.

—              If the warning ELAC1 goes out of view, replace the RELAY-ELAC 1 ANN SPLY (40CE1) Ref. AIPC 27-92-08-03.

—              Install ELAC1 Ref. AMM 27-93-34-400-001.

d            Do a check and repair the wiring of the DSI 4/1 (ELAC1 FAILED) signals from FCDC1 (3CE1) and FCDC2 (3CE2) to the relay (40CE1) Ref. ASM 27-95-04 and Ref. ASM 27-95-05.

e             Install ELAC1 Ref. AMM 27-93-34-400-001.

(2)          If the flight controls do not move according to the ELAC1 servoing:

(a)          Replace ELAC-1 (2CE1) Ref. AMM 27-93-34-000-001 and Ref. AMM 27-93-34-400-001.

(b)          If the fault continues:

1             Do a check of the P/N of the FCDC installed on the aircraft:

a             If the P/N of the FCDC is 115370-0105 or 115370-0106 or 115370-1016 or 115370-1216:

—              Replace ELAC-2 (2CE2) Ref. AMM 27-93-34-000-001 and Ref. AMM 27-93-34-400-001.

b             If the P/N of the FCDC is different from 115370-0105 or 115370-0106 or 115370-1016 or 115370-1216:

—              Continue the trouble shooting at paragraph 4.A.(2)(c).

(c)          Do the trouble shooting procedure Ref. TSM TASK 31-32-00-810-932 related to the DSO 06 discrete output signal of ELAC1 Ref. ASM 27-92-49.

Do the trouble shooting procedure Ref. TSM TASK 31-32-00-810-934 related to the DGO 01 digital output signal of ELAC1 Ref. ASM 27-92-50.

(d)          If the fault continues:

1             Do a check of the wiring of the DGO 04 signal from the ELAC1 (2CE1) COM part to the MON part (DGI 01) and the MON part (DGO 04) to the COM part (DGI 01) Ref. ASM 27-92-50.

—              If the wiring is not correct, repair the above wiring.

—              If the wiring is correct, continue the procedure.

2             Do a check of the wiring of the DGI 04 signal from the ELAC1 (2CE1) MON part to the COM part Ref. ASM 27-92-50.

—              If the wiring is not correct, repair the above wiring.

—              If the wiring is correct, continue the procedure.

3             Do a check of the wiring of the DGI 05 signal from the ELAC1 (2CE1) MON part to the COM part Ref. ASM 27-92-50.

—              If the wiring is not correct, repair the above wiring.

—              If the wiring is correct, continue the procedure.

4             Do a check of the wiring of the DSO 06 signal from the ELAC1 (2CE1) COM part to the MON part (DSI 48) and the MON part (DSO 06) to the COM part (DSI 48) Ref. ASM 27-92-49.

—              If the wiring is not correct, repair the above wiring.

—              If the wiring is correct, continue the procedure.

5             Do a check of the wiring of the DSI 07 signal from the ELAC1 (2CE1) COM part to the MON part Ref. ASM 27-92-44.

—              If the wiring is not correct, repair the above wiring.

—              If the wiring is correct, continue the procedure.

6             Do a check of the wiring of the DSI 10 signal from the ELAC1 (2CE1) COM part to the MON part Ref. ASM 27-92-44.

—              If the wiring is not correct, repair the above wiring.

—              If the wiring is correct, continue the procedure.

7             Do a check of the wiring of the DSI 13 signal from the ELAC1 (2CE1) COM part to the MON part Ref. ASM 27-92-44.

—              If the wiring is not correct, repair the above wiring.

—              If the wiring is correct, continue the procedure.

8             Do a check of the wiring of the DSI 17 signal from the ELAC1 (2CE1) COM part to the MON part Ref. ASM 27-92-44.

—              If the wiring is not correct, repair the above wiring.

—              If the wiring is correct, continue the procedure.

9             Do a check for an open circuit of the wirings of the DSI 39 and 47 signals from the ELAC1 (2CE1) COM part and the MON part Ref. ASM 27-92-40:

—              For DSI 39: pin AA/12J (COM part) and pin AD/15E (MON part).

—              For DSI 47: pin AA/5K (COM part) and pin AD/13H (MON part).

—              If the wirings are not correct, repair the above wirings.

—              If the wirings are correct, continue the procedure.

10           Replace the SSTU-ROLL CTL, CAPT (4CE1) and SSTU-ROLL CTL, F/O (4CE2) or the SSU-CAPT (100CE1) and SSU-F/O (100CE2) (if a new-generation side-stick unit is installed on the aircraft) Ref. AMM 27-92-41-000-002 and Ref. AMM 27-92-41-400-002 or Ref. AMM 27-92-41-000-802 and Ref. AMM 27-92-41-400-802.

(e)          If the fault continues:

1             Do a check of the wiring of the PWR SPLY + 28VDC signal from the ELAC1 (2CE1) COM part and the MON part to the first terminal block Ref. ASM 27-92-02.

—              If there is no continuity, repair the above wiring.

—              If there is continuity, continue the procedure.

2             Do a check of the wiring of the PWR SPLY GND signal from the ELAC1 (2CE1) COM part and the MON part to the ground terminal Ref. ASM 27-92-02.

—              If there is no continuity, repair the above wiring.

—              If there is continuity, continue the procedure.

3             Do a check of the wiring of the CTL + 28VDC and ELAC1 ENGAGED (DSI 50) signals from the ELAC1 (2CE1) COM part and the MON part to the pushbutton switch (6CE1) Ref. ASM 27-92-02.

—              If there is no continuity, repair the above wiring.

—              If there is continuity, continue the procedure.

4             Do a check of the wiring from the pushbutton switch (6CE1) pin A/C3 to the first terminal block Ref. ASM 27-92-02.

—              If there is no continuity, repair the above wiring.

—              If there is continuity, continue the procedure.

5             Replace the P/BSW-FLT CTL/ELAC 1 (6CE1) Ref. AIPC 27-92-08-02.

SUBTASK 27-93-00-740-175-A

B.            Do the test given in Para. 3.