W DOC AIRBUS | TSM A320F

Failure of the Right Blue Elevator Servocontrol Actuator Solenoid Valve

TASK 27-93-00-810-876-A
Failure of the Right Blue 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
  • RELAY-THS MOT 3 INHIBITION 1 [51CE]
  • RELAY-THS MOT 3 INHIBITION 2 [52CE]
  • ELAC-2 [2CE2]
  • solenoid valve of the servocontrol 34CE4
  • SERVO CTL-R ELEVATOR, OUTBD B [34CE4]
  • wiring of the SOL VLV1 signal from the servocontrol (34CE4) to the ELAC2 (2CE2)
  • wiring from the ELAC2 (2CE2) COM part to the ELAC2 COM part
  • wiring from the ELAC2 (2CE2) COM part to the ELAC2 MON part
  • wiring from the ELAC2 (2CE2) 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
AIPC 27920803
ASM 279308
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 27-93-00-700-166-A
A. Test
   (1) Do the operational test of the side stick assembly (Activation for the BITE test) AMM 27-96-00-710-020.
   (2) Do the BITE test of the EFCS (Ground Scanning) AMM 27-96-00-740-001.
4. Fault Isolation
Subtask 27-93-00-810-176-A
A. If the tests give the maintenance message R B ELEV MODE VLV 34CE4:
   (1) Remove the RELAY-THS MOT 3 INHIBITION 1 [51CE] and RELAY-THS MOT 3 INHIBITION 2 [52CE] AIPC 27920803.
   (2) Do a check of the resistance and insulation of the relays.
NOTE: The resistance of the winding (pins X1 and X2) must be between 280 and 400 ohms; the insulation must be more than 500 KOhms.
     (a) If the resistance is less than 280 ohms:
     (b) If the resistance is more than 400 ohms:
  • Replace the RELAY-THS MOT 3 INHIBITION 1 [51CE] and/or RELAY-THS MOT 3 INHIBITION 2 [52CE] .
     (c) If the resistance is between 280 and 400 ohms and if the insulation is more than 500 KOhms:
  • Install the RELAY-THS MOT 3 INHIBITION 1 [51CE] and RELAY-THS MOT 3 INHIBITION 2 [52CE] .
  • See Para (3).
   (3) If the fault continues:
   (4) Remove the ELAC2 AMM 27-93-34-000-001.
   (5) At the ELAC2 receptacle, do a check of the resistance between the pin AB/14K and the pin AE/14B ASM 279308.
NOTE: The resistance must be between 40 and 100 ohms.
     (a) If the resistance is less than 40 ohms:
  • At the outboard elevator servocontrol (34CE4), do a check of the resistance of the solenoid valve between the pin C/K and the pin C/L ASM 279308.
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 34CE4 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 outboard elevator servocontrol (34CE4) (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 (34CE4) to the ELAC2 (2CE2), from the pin C/K to the pin AB/14K and from the pin C/L to the pin AE/14B ASM 279308.
         b Replace the ELAC-2 [2CE2] AMM 27-93-34-000-001 and AMM 27-93-34-400-001.
     (b) If the resistance is more than 100 ohms:
  • At the outboard elevator servocontrol (34CE4), do a check of the resistance of the solenoid valve between the pin C/K and the pin C/L ASM 279308.
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 34CE4 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 outboard elevator servocontrol (34CE4) (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 (34CE4) to the ELAC2 (2CE2), from the pin C/K to the pin AB/14K and from the pin C/L to the pin AE/14B ASM 279308.
         b Install the ELAC2 AMM 27-93-34-400-001.
     (c) If the resistance values are in the specified limits:
  • See Para.(6).
   (6) At the ELAC 2 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, OUTBD B [34CE4] AMM 27-34-51-000-001 and AMM 27-34-51-400-001.
       3 Do a check of the wiring from the ELAC2 (2CE2) COM part to the ELAC2 COM part, from the pin AB/13K to the pin AB/13F ASM 279308:
         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 ELAC2 (2CE2) COM part to the ELAC2 MON part, from the pin AB/13E to the pin AE/12D ASM 279308:
         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 ELAC2 (2CE2) MON part pins AE/13B and AE/12C to the first terminal block ASM 279308.
       6 Install the ELAC-2 [2CE2] AMM 27-93-34-400-001.
     (b) If the resistance is less than 100 Megohms:
  • At the SERVO CTL-R ELEVATOR, OUTBD B [34CE4] , 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:
         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, OUTBD B [34CE4] AMM 27-34-51-000-001 and AMM 27-34-51-400-001.
. Replace the ELAC-2 [2CE2] 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, OUTBD B [34CE4] to the ELAC-2 [2CE2] .
         b Replace the ELAC-2 [2CE2] AMM 27-93-34-000-001 and AMM 27-93-34-400-001.
Subtask 27-93-00-700-167-A
B. Do the test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:28:00 UTC
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