W DOC AIRBUS | TSM A320F

Failure of the Right Yellow Elevator Servocontrol Actuator Solenoid valve

TASK 27-93-00-810-882-A
Failure of the Right Yellow Elevator Servocontrol Actuator Solenoid valve

CAUTION: DO NOT SWAP FLIGHT CONTROL COMPUTERS. IF THERE IS A SHORT CIRCUIT, YOU WILL CAUSE DAMAGE TO A SERVICEABLE COMPUTER WHEN YOU SWAP THEM.
1. Possible Causes
  • solenoid valve of the servocontrol 34CE2
  • SERVO CTL-R ELEVATOR, INBD Y [34CE2]
  • ELAC-1 [2CE1]
  • wiring of the SOL VLV1 signal from the servocontrol (34CE2) to the ELAC1 (2CE1)
  • wiring from the ELAC1 (2CE1) COM part to the ELAC1 COM part
  • wiring from the ELAC1 (2CE1) COM part to the ELAC1 MON part
  • wiring from the ELAC1 (2CE1) MON part pins AE/13B and AE/12C to the first terminal block
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 27-34-51-000-001
Removal of the Elevator Servo Control
AMM 27-34-51-000-005
Removal of the Solenoid Valve of the Elevator Servo-Control Actuator
AMM 27-34-51-400-001
Installation of the Elevator Servo Control
AMM 27-34-51-400-004
Installation of the Solenoid Valve of the Elevator Servo-Control Actuator
ASM 279307
AMM 27-93-34-000-001
Removal of the ELAC
AMM 27-93-34-400-001
Installation of the ELAC
AMM 27-96-00-710-020
Operational Test of the Side Stick Assembly (Activation for the BITE Test)
AMM 27-96-00-740-001
BITE Test of the EFCS (Ground Scanning)
3. Fault Confirmation
Subtask 27-93-00-700-168-A
A. Test
   (1) Do the operational test of the side stick assembly (Activation for the BITE test) AMM 27-96-00-710-020.
NOTE: Before you start the operational test procedure, release the FLT CTL/ELAC2 pushbutton switch (on this pushbutton switch, the OFF legend comes on).
   (2) Do the BITE test of the EFCS (Ground Scanning) AMM 27-96-00-740-001.
4. Fault Isolation
Subtask 27-93-00-810-177-A
A. If the tests give the maintenance message R Y ELEV MODE VLV 34CE2:
   (1) Remove the ELAC1 AMM 27-93-34-000-001.
   (2) At the ELAC1 receptacle, do a check of the resistance between the pin AB/14K and the pin AE/14B ASM 279307.
NOTE: The resistance must be between 40 and 100 Ohms.
     (a) If the resistance is less than 40 Ohms:
  • at the inboard elevator servocontrol (34CE2), do a check of the resistance of the solenoid valve between the pin C/K and the pin C/L ASM 279307.
NOTE: The resistance must be between 40 and 100 Ohms.
       1 If the resistance values are out of the specified limits:
         a Replace the solenoid valve of the servocontrol 34CE2 AMM 27-34-51-000-005 and AMM 27-34-51-400-004.
         b Do again a check of the resistance of the solenoid valve between the pin C/K and the pin C/L of the inboard elevator servocontrol (34CE2) (40 to 100 Ohms).
       2 If the resistance values are in the specified limits:
         a Repair the wiring of the SOL VLV1 signal from the servocontrol (34CE2) to the ELAC1 (2CE1), from the pin C/K to the pin AB/14K and from the pin C/L to the pin AE/14B ASM 279307:
         b Replace the ELAC-1 [2CE1] AMM 27-93-34-000-001 and AMM 27-93-34-400-001.
     (b) If the resistance is more than 100 Ohms:
  • at the inboard elevator servocontrol (34CE2), do a check of the resistance of the solenoid valve between the pin C/K and the pin C/L ASM 279307.
NOTE: The resistance must be between 40 and 100 Ohms.
       1 If the resistance values are out of the specified limits:
         a Replace the solenoid valve of the servocontrol 34CE2 AMM 27-34-51-000-005 and AMM 27-34-51-400-004.
         b Do again a check of the resistance of the solenoid valve between the pin C/K and the pin C/L of the inboard elevator servocontrol (34CE2) (40 to 100 Ohms).
       2 If the resistance values are in the specified limits:
         a Repair the wiring of the SOL VLV1 signal from the servocontrol (34CE2) to the ELAC1 (2CE1), from the pin C/K to the pin AB/14K and from the pin C/L to the pin AE/14B ASM 279307:
         b Install the ELAC1 AMM 27-93-34-400-001.
     (c) If the resistance values are in the specified limits:
  • See Para. (3).
   (3) At the ELAC 1 receptacle, do a check of the insulation between pin AB/14K (pin AE/14B) and the ground.
NOTE: The resistance must be more than 100 Megohms.
     (a) If the resistance is more than 100 Megohms:
       1 If the fault continues:
. Replace the solenoid valve AMM 27-34-51-000-005 and AMM 27-34-51-400-004.
       2 If the fault continues:
. Replace the SERVO CTL-R ELEVATOR, INBD Y [34CE2] AMM 27-34-51-000-001 and AMM 27-34-51-400-001.
       3 do a check of the wiring from the ELAC1 (2CE1) COM part to the ELAC1 COM part, from the pin AB/13K to the pin AB/13F ASM 279307:
         a If the wiring is correct, see Para. 4_
         b If the wiring is not correct:
       4 do a check of the wiring from the ELAC1 (2CE1) COM part to the ELAC1 MON part, from the pin AB/13E to the pin AE/12D ASM 279307:
         a If the wiring is correct, see Para. 5_
         b If the wiring is not correct:
       5 do a check and repair the wiring from the ELAC1 (2CE1) MON part pins AE/13B and AE/12C to the first terminal block ASM 279307:
       6 Install the ELAC-1 [2CE1] AMM 27-93-34-400-001.
     (b) If the resistance is less than 100 Megohms:
  • at the SERVO CTL-R ELEVATOR, INBD Y [34CE2] , do a check of the insulation of the solenoid valve between pin C/K (pin C/L) and the ground.
       1 If the resistance is less than 100 Megohms:
Replace the solenoid valve AMM 27-34-51-000-005 and AMM 27-34-51-400-004.
         a Do again a check of the insulation of the solenoid valve between pin C/K (pin C/L) and the ground.
If the resistance is less than 100 Megohms:
. Replace the SERVO CTL-R ELEVATOR, INBD Y [34CE2] AMM 27-34-51-000-001 and AMM 27-34-51-400-001.
. Replace the ELAC-1 [2CE1] AMM 27-93-34-000-001 and AMM 27-93-34-400-001.
       2 If the resistance is more than 100 Megohms:
         a Repair the wiring of the solenoid valve signal from the SERVO CTL-R ELEVATOR, INBD Y [34CE2] to the ELAC-1 [2CE1] .
         b Replace the ELAC-1 [2CE1] AMM 27-93-34-000-001 and AMM 27-93-34-400-001.
Subtask 27-93-00-700-169-A
B. Do the test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:28:01 UTC
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