W DOC AIRBUS | TSM A320F

Loss of the THS Monitor Transducer Signal for the SEC 1

TASK 27-94-00-810-837-A
Loss of the THS Monitor Transducer Signal for the SEC 1

1. Possible Causes
  • monitor position transducer of the THS actuator
  • command position transducer of the THS actuator
  • wiring of the XDCR COM from the THS actuator (9CE) to the first terminal block
  • wiring of the XDCR MON from the THS actuator (9CE) to the first terminal block
  • SEC-1 [1CE1]
  • wiring from the ANI 2-3 XDCR MON signal of the SEC 1 (1CE1) to the first terminal block
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
TSM TASK 27-90-00-810-818-A
Loss of the ACS1 Signal of the SEC1 MON Side
AMM 27-44-56-400-001
Installation of the Position Transducer to the THS Actuator
ASM 279312
ASM 279412
AMM 27-94-34-000-001
Removal of the SEC
AMM 27-94-34-400-001
Installation of the SEC
AMM 27-96-00-710-022
Operational Test of the THS Actuator Electrical Control (Activation for BITE Test)
AMM 27-96-00-740-001
BITE Test of the EFCS (Ground Scanning)
AMM 29-10-00-864-003
Depressurize the Blue Hydraulic System
AMM 29-23-00-864-001
Depressurize the Green and Yellow Hydraulic Systems after Operation of the PTU
AMM 29-24-00-864-001
Depressurize the Yellow Hydraulic System
3. Fault Confirmation
Subtask 27-94-00-700-090-A
A. Test
   (1) Do the operational test of the THS actuator electrical control AMM 27-96-00-710-022.
NOTE: Do the ground setting only with the SEC 1.
   (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:
SEC1 MON OR WIRING FROM THS ACTR XDCR2 9CE
  • refer to Para. Fault Isolation.
     (b) If the ground scanning gives at least two maintenance messages of the list below:
SEC1 OR WIRING FROM L ELEV POS MON XDCR
SEC1 OR WIRING FROM R ELEV POS MON XDCR
SEC1 MON OR WIRING FROM THS ACTR XDCR2 9CE
SEC1 OR WIRING FROM L G ELEV MODE XDCR 34CE1
SEC1 OR WIRING FROM R Y ELEV MODE XDCR 34CE2
4. Fault Isolation
Subtask 27-94-00-810-086-A
A. If the BITE test gives the maintenance message:
SEC1 MON OR WIRING FROM THS ACTR XDCR2 9CE
   (1) On the overhead panel 23VU:
  • make sure that the FLT CTL/ELAC1 pushbutton switch is pushed (the FAULT and OFF legends of this pushbutton switch are off).
  • release the FLT CTL/SEC1 pushbutton switch (the OFF legend of this pushbutton switche comes on).
   (2) On the overhead panel 24VU:
  • release the FLT CTL/ELAC2, FLT CTL/SEC2 and the FLT CTL/SEC3 pushbutton switches (the OFF legend of these pushbutton switches comes on).
   (3) Pressurize the aircraft hydraulic systems AMM 29-23-00-864-001 AMM 29-24-00-864-001, AMM 29-10-00-864-003.
   (4) Do the BITE test of the EFCS (Groud Scanning) AMM 27-96-00-740-001.
     (a) If the ground scanning gives a maintenance message related to the ELAC1 and THS ACTR XDCR:
       1 If the fault continues:
  • do a check of the wiring of the XDCR COM from the THS actuator (9CE) to the first terminal block ASM 279312.
       2 If the fault continues:
  • do a check of the wiring of the XDCR MON from the THS actuator (9CE) to the first terminal block ASM 279312.
     (b) If the ground scanning does not give a maintenance message related to the ELAC1 and THS ACTR XDCR:
   (5) If the fault continues:
  • do a check and repair the wiring from the ANI 2-3 XDCR MON signal of the SEC 1 (1CE1) to the first terminal block, ASM 279412.
Subtask 27-94-00-700-091-A
B. Do the tests given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:28:14 UTC
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