Failure of the SEC1 A320
1. Possible Causes:
-RELAY-SEC 1 ANN SPLY (41CE1)
-SEC-1 (1CE1)
-FCDC-1 (3CE1)
-FCDC-2 (3CE2)
-wiring of the RLY SEC FAULT signal from the relay to the SEC
-wiring of the DSI 4/3 (SEC 1 FAILED) signals
-wiring of the + 28VDC signal
-wiring of the 28VDC GND signal
-wiring of the SEC1 ENGAGED (DSI 04) signal
-wiring of the PLD ACTIVATION (DSI 01) signal
-wiring of the REVERSE LOCK AUTHORIZATION (DSI 02) signal
-wiring from the pushbutton switch (5CE1), pin A/C1 and pin A/C3 to the first terminal block
-P/BSW-FLT CTL/SEC 1 (5CE1)
-wiring of the SEC DISCONNECTED IN THE RACK (DSI 12 and DSI 28) signals
-wiring of the PIN PROGRAM SEC1 (DSI 07) signal
-wiring of the DGO 03 signal
-wiring
2. Job Set-up Information
A. Referenced Information
| REFERENCE | DESIGNATION |
| Ref. AMM 27-94-00-710-002 | Operational Test of the Spoiler Elevator Computer 1 (SEC 1) |
| Ref. AMM 27-94-34-000-001 | Removal of the SEC |
| Ref. AMM 27-94-34-400-001 | Installation of the SEC |
| Ref. AMM 27-95-34-000-001 | Removal of the FCDC |
| Ref. AMM 27-95-34-400-001 | Installation of the FCDC |
| Ref. AMM 27-96-00-740-001 | Operational Check of EFCS by BITE (Ground Scanning) |
3. Fault Confirmation
SUBTASK 27-94-00-740-158-A
A. Test(s)
(1) Do the BITE test of the EFCS (ground scanning) Ref. AMM 27-96-00-740-001.
4. Fault Isolation
SUBTASK 27-94-00-810-132-C
A. If the test confirms the fault:
— Do the operational test of SEC1 Ref. AMM 27-94-00-710-002 to make sure that it does the servoing of its related surfaces.
(1) If the flight controls move in relation to the SEC1 servoing:
(a) Remove the SEC1 Ref. AMM 27-94-34-000-001.
(b) At the SEC1 receptacle, do a check of the resistance between pin AB/12K and pin AE/12A Ref. ASM 27-92-05.
1 If the resistance is less than 280 ohms:
a Remove the RELAY-SEC 1 ANN SPLY (41CE1) Ref. AIPC 27-92-08-03.
b Do a check of the resistance of the relay between pins X1 and X2.
— If the resistance is less than 280 ohms:
. Replace the RELAY-SEC 1 ANN SPLY (41CE1) Ref. AIPC 27-92-08-03
. Install the SEC1 Ref. AMM 27-94-34-400-001.
— If the resistance is between 280 and 400 ohms:
. Do a check and repair the wiring of the RLY SEC FAULT signal from the relay to the SEC Ref. ASM 27-92-05
. Install the relay
. Replace the SEC-1 (1CE1) Ref. AMM 27-94-34-400-001.
2 If the resistance is more than 400 ohms:
a Remove the relay (41CE1).
b Do a check of the resistance of the relay between pins X1 and X2.
— If the resistance is more than 400 ohms:
. Replace the RELAY-SEC 1 ANN SPLY (41CE1) Ref. AIPC 27-92-08-03
. Install the SEC1 Ref. AMM 27-94-34-400-001.
— If the resistance is between 280 and 400 ohms:
. Do a check and repair the wiring of the RLY SEC FAULT signal from the relay to the SEC Ref. ASM 27-92-05
. Install the relay
. Install SEC1 Ref. AMM 27-94-34-400-001.
3 If the resistance is between 280 and 400 ohms:
a Install SEC1 Ref. AMM 27-94-34-400-001.
b Remove the FCDC-1 (3CE1) Ref. AMM 27-95-34-000-001.
— If SEC1 FAULT warning message stays in view, install the FCDC-1 (3CE1) Ref. AMM 27-95-34-400-001 and go to Para. c_.
— if the SEC1 FAULT warning message goes out of view, replace the FCDC-1 (3CE1) Ref. AMM 27-95-34-000-001 and Ref. AMM 27-95-34-400-001.
c If the fault continues:
— Remove the FCDC-2 (3CE2) Ref. AMM 27-95-34-000-001
— if the SEC1 FAULT warning message stays in view, install the FCDC-2 (3CE2) Ref. AMM 27-95-34-400-001 and go to Para. d_.
— if the SEC1 FAULT warning message goes out of view, replace the FCDC-2 (3CE2) Ref. AMM 27-95-34-000-001 and Ref. AMM 27-95-34-400-001.
d If the fault continues:
— Remove the RELAY-SEC 1 ANN SPLY (41CE1) Ref. AIPC 27-92-08-03
— if the SEC1 FAULT warning message stays in view, install the RLY-SEC 1 ANN SPLY (41CE1) Ref. AIPC 27-92-08-03 and go to Para. e_.
— if the SEC1 FAULT warning message goes out of view, replace the RLY-SEC 1 ANN SPLY (41CE1) Ref. AIPC 27-92-08-03.
e If the fault continues:
— Do a check and repair the wiring of the DSI 4/3 (SEC 1 FAILED) signals from the FCDC1 (3CE1) and the FCDC2 (3CE2) to the RLY-SEC 1 ANN SPLY (41CE1) Ref. ASM 27-95-04 and Ref. ASM 27-95-05
(2) If the flight controls do not move in relation to the SEC servoing:
(a) Do a check of the wiring of the + 28VDC signal from the SEC1 (1CE1) COM part and MON part to the first terminal block Ref. ASM 27-92-04:
— if there is no continuity, repair the above wiring
— if there is continuity, go to Para. (b).
(b) Do a check of the wiring of the 28VDC GND signal from the SEC1 (1CE1) COM part and MON part to the first terminal block Ref. ASM 27-92-04:
— if there is no continuity, repair the above wiring
— if there is continuity, go to Para. (c).
(c) Do a check of the wiring of the SEC1 ENGAGED (DSI 04) signal from the SEC1 (1CE1) COM part and MON part to the first terminal block Ref. ASM 27-92-04:
— if there is no continuity, repair the above wiring
— if there is continuity, go to Para. (d).
(d) On the SEC from standard 112, do a check of the wiring of the PLD ACTIVATION (DSI 01) signal from the SEC1 (1CE1) COM part and MON part to the first terminal block Ref. ASM 27-92-04:
— if there is no continuity, repair the above wiring
— if there is continuity, go to Para. (e).
(e) On the SEC from standard 112, do a check of the wiring of the REVERSE LOCK AUTHORIZATION (DSI 02) signal from the SEC1 (1CE1) COM part and MON part to the first terminal block Ref. ASM 27-92-04:
— if there is no continuity, repair the above wiring
— if there is continuity, go to Para. (f).
(f) Do a check of the wiring from the pushbutton switch (5CE1), pin A/C1 and pin A/C3 to the first terminal block Ref. ASM 27-92-04:
— if there is no continuity, repair the above wiring
— if there is continuity, go to Para. (g).
(g) Replace the P/BSW-FLT CTL/SEC 1 (5CE1) Ref. AIPC 27-92-08-02.
(h) If the fault continues:
1 Do a check of the wiring of the SEC DISCONNECTED IN THE RACK (DSI 12 and DSI 28) signals from the SEC1 (1CE1) COM part and MON part to the ground terminal Ref. ASM 27-92-40:
— if there is no continuity, repair the above wiring
— if there is continuity, go to Para. 2_.
2 Do a check of the wiring of the PIN PROGRAM SEC1 (DSI 07) signal from the SEC1 (1CE1) COM part and MON part to the ground terminal Ref. ASM 27-92-40:
— if there is no continuity, repair the above wiring
— if there is continuity, go to Para. 3_.
3 Do a check and repair the wiring of the DGO 03 signal from the SEC1 (1CE1) COM part to MON part and MON part to COM part Ref. ASM 27-92-53.
SUBTASK 27-94-00-810-175-A
B. If the fault continues:
(1) Remove the SEC 1.
(2) Do a check and repair the wiring of the signals that follow Ref. ASM 27-94-14:
— The TEST RQ OWN signal from the SEC 1 (1CE1) COM part to the SEC 1 (1CE1) MON part
— The WATCH DOG OWN signal from the SEC 1 (1CE1) COM part to the SEC 1 (1CE1) MON part
— The FAIL OWN signal from the SEC 1 (1CE1) COM part to the SEC 1 (1CE1) MON part
— The PS MON OUTPUT + signal from the SEC 1 (1CE1) COM part to the SEC 1 (1CE1) MON part
— The PS MON OUTPUT — signal from the SEC 1 (1CE1) COM part to the SEC 1 (1CE1) MON part
— The TEST RQ OPP signal from the SEC 1 (1CE1) COM part to the SEC 1 (1CE1) MON part
— The WATCH DOG OPP signal from the SEC 1 (1CE1) COM part to the SEC 1 (1CE1) MON part
— The FAIL OPP signal from the SEC 1 (1CE1) COM part to the SEC 1 (1CE1) MON part
— The PS MON INPUT — signal from the SEC 1 (1CE1) COM part to the SEC 1 (1CE1) MON part
— The PS MON INPUT + signal from the SEC 1 (1CE1) COM part to the SEC 1 (1CE1) MON part.
(3) Install the SEC 1.
SUBTASK 27-94-00-740-159-A
C. Do the test given in Para. 3.
