W DOC AIRBUS | TSM A320F

Failure of the THS Actuator Servo Motor 3 for the SEC 2

TASK 27-40-00-810-801-A
Failure of the THS Actuator Servo Motor 3 for the SEC 2

1. Possible Causes
  • SEC-2 [1CE2]
  • RELAY-PITCH TRIM ACTUATOR MOTOR 3 SPLY [36CE3]
  • electronic module 3
  • wiring of the enable signal from the THS actuator (9CE) to the SEC 2 (1CE2)
  • wiring of the DSI-25 signal from the SEC 2 (1CE2) to the THS actuator (9CE)
  • wiring from the relay (36CE3) to the SEC 2 (1CE2) and to the THS actuator (9CE)
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 24-41-00-861-002
Energize the Aircraft Electrical Circuits from the External Power
AMM 27-44-57-000-002
Removal of the Electronic Modules of the Pitch Trim Actuator
AMM 27-44-57-400-002
Installation of the Electronic Modules of the Pitch Trim Actuator
ASM 279413
AMM 27-94-34-000-001
Removal of the SEC
AMM 27-94-34-400-001
Installation of the SEC
AMM 27-96-00-740-001
BITE Test of the EFCS (Ground Scanning)
AMM 29-10-00-864-001
Depressurize the Green Hydraulic System
AMM 29-10-00-864-002
Depressurize the Yellow Hydraulic System
AMM 29-10-00-864-003
Depressurize the Blue Hydraulic System
3. Fault Confirmation
Subtask 27-40-00-700-050-A
A. Test
   (1) Energize the aircraft electrical circuits
AMM 24-41-00-861-002.
   (2) Make sure that the Green, Blue and Yellow hydraulic systems are not pressurized AMM 29-10-00-864-001, AMM 29-10-00-864-003 and AMM 29-10-00-864-002.
   (3) On the panel 24VU:
  • release the FLT CTL/SEC2 pushbutton switch.(On this pushbutton switch, the OFF legend comes on).
   (4) Wait 30 seconds.
   (5) On the panel 24VU:
  • push the FLT CTL/SEC2 pushbutton switch.(On this pushbutton switch, the OFF legend goes off).
   (6) Do the BITE test of the EFCS (ground scanning) AMM 27-96-00-740-001.
NOTE: Wait 60 seconds before you start the BITE test.
4. Fault Isolation
Subtask 27-40-00-810-050-A
A. If the BITE test gives the maintenance message:
THS ACTR SERVO MOT 3 9CE OF SEC2
   (1) If the fault continues:
  • replace the RELAY-PITCH TRIM ACTUATOR MOTOR 3 SPLY [36CE3] (Ref. IPC 27920803).
   (2) If the fault continues:
   (3) If the fault continues:
  • do a check of the wiring of the enable signal from the THS actuator (9CE) to the SEC 2 (1CE2) ASM 279413.
     (a) If there is no continuity, repair the wiring.
     (b) If there is continuity:
  • do a check of the wiring of the DSI-25 signal from the SEC 2 (1CE2) to the THS actuator (9CE) ASM 279413.
       1 If there is no continuity, repair the wiring.
       2 If there is continuity:
  • do a check and repair the wiring from the relay (36CE3) to the SEC 2 (1CE2) and to the THS actuator (9CE) ASM 279413.
Subtask 27-40-00-700-051-A
B. Do the tests given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:27:35 UTC
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