DOC AIRBUS | TSM A320FFailure of the Right Blue Aileron Servo Control Solenoid Valve
TASK 27-10-00-810-831-A
Failure of the Right Blue Aileron Servo Control Solenoid Valve
A. Referenced Information
3. Fault Confirmation
Subtask 27-10-00-860-100-A
Subtask 27-10-00-810-080-A
[Rev.8 from Aug 2018]
2026.04.04 04:27:28 UTC
Failure of the Right Blue Aileron Servo Control 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
- SERVO CTL-R AILERON, OUTBD B [33CE4]
- ELAC-2 [2CE2]
wiring of the SOL VLV signal from the servo control (33CE4) to the ELAC2 (2CE2)
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 27-14-51-000-001 | Removal of the Aileron Servo Control |
| AMM 27-14-51-000-004 | Removal of the Aileron Servo-Control Solenoid Valve |
| AMM 27-14-51-400-001 | Installation of the Aileron Servo Control |
| AMM 27-14-51-400-004 | Installation of the Aileron Servo-Control Solenoid Valve |
| ASM 279303 | |
| AMM 27-93-34-000-001 | Removal of the ELAC |
| AMM 27-93-34-400-001 | Installation of the ELAC |
| AMM 27-96-00-740-001 | BITE Test of the EFCS (Ground Scanning) |
| AMM 29-10-00-863-003 | Pressurize the Blue Hydraulic System with a Hydraulic Ground Power-Cart |
| AMM 29-10-00-864-003 | Depressurize the Blue Hydraulic System |
| AMM 29-23-00-863-001 | Pressurize the Green Hydraulic System from the Yellow Hydraulic System through the PTU with the Electric Pump |
| AMM 29-23-00-864-001 | Depressurize the Green and Yellow Hydraulic Systems after Operation of the PTU |
| AMM 29-24-00-863-001 | Pressurize the Yellow Hydraulic System with the Electric Pump |
| AMM 29-24-00-864-001 | Depressurize the Yellow Hydraulic System |
Subtask 27-10-00-860-100-A
A. Job Set-Up
(1) Make sure that, on the overhead panel 23VU, the pushbutton of the FLT CTL/ELAC1 is pushed (on the pushbutton switch, the OFF legend of the FLT CTL/ELAC1 is off).
(2) Make sure that, on the overhead panel 24VU, the pushbutton of the FLT CTL/ELAC2 is pushed (on the pushbutton switch, the OFF legend of the FLT CTL/ELAC2 is off).
(3) Make sure that hydraulic systems are depressurized
AMM 29-10-00-864-003, AMM 29-23-00-864-001 and AMM 29-24-00-864-001.
(4) Pressurize the aircraft hydraulic systems
AMM 29-10-00-863-003, AMM 29-23-00-863-001 and AMM 29-24-00-863-001.
(a) Wait for one minute.
Subtask 27-10-00-740-060-A Subtask 27-10-00-860-101-A (1) Make sure that, on the overhead panel 23VU, the pushbutton of the FLT CTL/ELAC1 is pushed (on the pushbutton switch, the OFF legend of the FLT CTL/ELAC1 is off).
(2) Make sure that, on the overhead panel 24VU, the pushbutton of the FLT CTL/ELAC2 is pushed (on the pushbutton switch, the OFF legend of the FLT CTL/ELAC2 is off).
(3) Make sure that hydraulic systems are depressurized
AMM 29-10-00-864-003, AMM 29-23-00-864-001 and AMM 29-24-00-864-001.
(4) Pressurize the aircraft hydraulic systems
AMM 29-10-00-863-003, AMM 29-23-00-863-001 and AMM 29-24-00-863-001.
(a) Wait for one minute.
C. Put the aircraft back to its initial configuration.
(1) Depressurize the aircraft hydraulic systems AMM 29-10-00-864-003, AMM 29-23-00-864-001 and AMM 29-24-00-864-001.
4. Fault Isolation(1) Depressurize the aircraft hydraulic systems AMM 29-10-00-864-003, AMM 29-23-00-864-001 and AMM 29-24-00-864-001.
Subtask 27-10-00-810-080-A
A. If the test gives the maintenance message:
R B AIL MODE VLV 33CE4
(1) Remove the ELAC2 AMM 27-93-34-000-001.
(2) At the ELAC2 receptacle, do a check of the resistance between pin AA/7J and pin AD/10A ASM 279303.
a Replace the solenoid valve of the aileron servo control (33CE4), AMM 27-14-51-000-004 and AMM 27-14-51-400-004.
b Do again a check of the resistance of the solenoid valve between pin A/H and A/T of the outboard aileron servocontrol (33CE4) (40 to 100 Ohms).
a Repair thewiring of the SOL VLV signal from the servo control (33CE4) to the ELAC2 (2CE2) , ASM 279303.
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:
a Replace the solenoid valve of the aileron servo control (33CE4), AMM 27-14-51-000-004 and AMM 27-14-51-400-004.
b Do again a check of the resistance of the solenoid valve between pin A/H and A/T of the outboard aileron servocontrol (33CE4) (40 to 100 Ohms).
a Repair thewiring of the SOL VLV signal from the servo control (33CE4) to the ELAC2 (2CE2) , ASM 279303.
b Install the ELAC2 AMM 27-93-34-400-001.
(c) If the resistance values are in the specified limits:
Subtask 27-10-00-740-061-A R B AIL MODE VLV 33CE4
(1) Remove the ELAC2 AMM 27-93-34-000-001.
(2) At the ELAC2 receptacle, do a check of the resistance between pin AA/7J and pin AD/10A ASM 279303.
NOTE: The resistance must be between 40 and 100 Ohms.
(a) If the resistance is less than 40 Ohms: - At the outboard aileron servocontrol (33CE4), do a check of the resistance of the solenoid valve between pin A/H and pin A/T ASM 279303.
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 aileron servo control (33CE4), AMM 27-14-51-000-004 and AMM 27-14-51-400-004.
b Do again a check of the resistance of the solenoid valve between pin A/H and A/T of the outboard aileron servocontrol (33CE4) (40 to 100 Ohms).
- If the resistance values are out of the specified limits:
. Replace the SERVO CTL-R AILERON, OUTBD B [33CE4] AMM 27-14-51-000-001 and AMM 27-14-51-400-001.
. Replace the ELAC-2 [2CE2] AMM 27-93-34-000-001 AMM 27-93-34-400-001. - If the resistance values are in the specified limits:
Replace the ELAC-2 [2CE2] AMM 27-93-34-000-001 AMM 27-93-34-400-001.
a Repair the
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 aileron servocontrol (33CE4), do a check of the resistance of the solenoid valve between pin A/H and pin A/T ASM 279303.
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 aileron servo control (33CE4), AMM 27-14-51-000-004 and AMM 27-14-51-400-004.
b Do again a check of the resistance of the solenoid valve between pin A/H and A/T of the outboard aileron servocontrol (33CE4) (40 to 100 Ohms).
- If the resistance values are out of the specified limits:
. Replace the SERVO CTL-R AILERON, OUTBD B [33CE4] AMM 27-14-51-000-001 and AMM 27-14-51-400-001.
. Install the ELAC2 AMM 27-93-34-400-001. - If the resistance values are in the specified limits:
Install the ELAC2 AMM 27-93-34-400-001.
a Repair the
b Install the ELAC2 AMM 27-93-34-400-001.
(c) If the resistance values are in the specified limits:
- Replace the ELAC-2 [2CE2] , AMM 27-93-34-000-001 and AMM 27-93-34-400-001.
B. Do the test given in Para. 3.