Failure of the Right Yellow Elevator-Servocontrol Actuator Solenoid-Valve A320
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:
-SERVO CTL-R ELEVATOR, INBD Y (34CE2)
-ELAC-1 (2CE1)
-solenoid valve of the servocontrol 34CE2
-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 |
| Ref. AMM 27-34-51-000-001 | Removal of the Elevator Servo Control |
| Ref. AMM 27-34-51-000-005 | Removal of the Solenoid Valve of the Elevator Servo-Control Actuator |
| Ref. AMM 27-34-51-400-001 | Installation of the Elevator Servo Control |
| Ref. AMM 27-34-51-400-004 | Installation of the Solenoid Valve of the Elevator Servo-Control Actuator |
| Ref. ASM 27-93-07 | |
| Ref. AMM 27-93-34-000-001 | Removal of the ELAC |
| Ref. AMM 27-93-34-400-001 | Installation of the ELAC |
| Ref. AMM 27-96-00-710-020 | Operational Test of the Side Stick Assembly (Activation for the BITE Test) |
| Ref. AMM 27-96-00-740-001 | Operational Check of EFCS by BITE (Ground Scanning) |
3. Fault Confirmation
SUBTASK 27-93-00-700-168-A
A. Test(s)
(1) Do the operational test of the side stick assembly (Activation for the BITE test) Ref. 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) Ref. 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 Ref. 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 Ref. ASM 27-93-07.
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 Ref. ASM 27-93-07.
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 Ref. AMM 27-34-51-000-005 and Ref. 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).
— If the resistance values are out of the specified limits:
. Replace SERVO CTL-R ELEVATOR, INBD Y (34CE2) Ref. AMM 27-34-51-000-001 and Ref. AMM 27-34-51-400-001.
. Replace ELAC-1 (2CE1) Ref. AMM 27-93-34-000-001 and Ref. AMM 27-93-34-400-001.
-If the resistance values are in the specified limits:
Replace ELAC-1 (2CE1) Ref. AMM 27-93-34-000-001 and Ref. AMM 27-93-34-400-001.
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 Ref. ASM 27-93-07:
b Replace the ELAC-1 (2CE1) Ref. AMM 27-93-34-000-001 and Ref. 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 Ref. ASM 27-93-07.
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 Ref. AMM 27-34-51-000-005 and Ref. 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).
— If the resistance values are out of the specified limits:
. Replace the SERVO CTL-R ELEVATOR, INBD Y (34CE2) Ref. AMM 27-34-51-000-001 and Ref. AMM 27-34-51-400-001.
. Install the ELAC1 Ref. AMM 27-93-34-400-001.
— If the resistance values are in the specified limits:
Install the ELAC1 Ref. AMM 27-93-34-400-001.
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 Ref. ASM 27-93-07:
b Install the ELAC1 Ref. 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:
— Replace the ELAC-1 (2CE1) Ref. AMM 27-93-34-000-001 and Ref. AMM 27-93-34-400-001.
1 If the fault continues:
. Replace the solenoid valve Ref. AMM 27-34-51-000-005 and Ref. AMM 27-34-51-400-004.
2 If the fault continues:
. Replace the SERVO CTL-R ELEVATOR, INBD Y (34CE2) Ref. AMM 27-34-51-000-001 and Ref. 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 Ref. ASM 27-93-07:
a If the wiring is correct, see Para. 4_
b If the wiring is not correct:
-repair it
— install the ELAC1 Ref. AMM 27-93-34-400-001
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 Ref. ASM 27-93-07:
a If the wiring is correct, see Para. 5_
b If the wiring is not correct:
— repair it
— install the ELAC1 Ref. AMM 27-93-34-400-001
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 Ref. ASM 27-93-07:
6 Install the ELAC-1 (2CE1) Ref. 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 Ref. AMM 27-34-51-000-005 and Ref. 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) Ref. AMM 27-34-51-000-001 and Ref. AMM 27-34-51-400-001.
. Replace the ELAC-1 (2CE1) Ref. AMM 27-93-34-000-001 and Ref. 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) Ref. AMM 27-93-34-000-001 and Ref. AMM 27-93-34-400-001.
SUBTASK 27-93-00-700-169-A
B. Do the test given in Para. 3.
