Failure of the Right Blue Aileron Servo Control Servovalve

TASK 27-10-00-810-830-A
Failure of the Right Blue Aileron Servo Control Servovalve

1. Possible Causes

servovalve of the servo control 33CE4
wiring POS XDCR signal from the servocontrol (33CE4) to the ELAC 2 (2CE2) COM and MON side
ELAC-2 [2CE2]
SERVO CTL-R AILERON, OUTBD B [33CE4]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 27-10-00-810-814-A	Disagree between COM & MON Aileron Order Signal in the ELAC 2
AMM 27-14-51-000-001	Removal of the Aileron Servo Control
AMM 27-14-51-000-003	Removal of the Aileron Servo-Control Servovalve
AMM 27-14-51-400-001	Installation of the Aileron Servo Control
AMM 27-14-51-400-003	Installation of the Aileron Servo-Control Servovalve
ASM 279303
AMM 27-93-34-000-001	Removal of the ELAC
AMM 27-93-34-400-001	Installation of the ELAC
AMM 27-96-00-710-020	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)
AMM 29-10-00-863-001	Pressurize the Green Hydraulic System with a Hydraulic Ground Power-Cart
AMM 29-10-00-863-002	Pressurize the Yellow Hydraulic System with a Hydraulic Ground Power-Cart
AMM 29-10-00-863-003	Pressurize the Blue Hydraulic System with a Hydraulic Ground Power-Cart

3. Fault Confirmation
Subtask 27-10-00-700-095-A ** ON A/C NOT FOR ALL

A. Test
(1) Make sure that all the hydraulic systems are depressurized.
(2) On the overhead panel 23VU:

Release the FLT CTL/ELAC 1 pushbutton switch (the OFF legend of the FLT CTL/ELAC 1 pushbutton switch comes on).

(3) On the overhead panel 23VU:

Push the FLT CTL/ELAC 1 pushbutton switch (the OFF legend of the FLT CTL/ELAC 1 pushbutton switch goes off).

NOTE: In case of a reset of the ELAC 1 with the circuit breaker, the supply breaking must be more than 5 seconds.

NOTE: If the ELAC FAULT warning disappears after several resets, replace the computer.

(4) Pressurize all the hydraulic systems AMM 29-10-00-863-001, AMM 29-10-00-863-002 and AMM 29-10-00-863-003.
(5) Do the operational test of the side stick assembly (activation for the BITE test) AMM 27-96-00-710-020.
(6) Do the BITE test of the EFCS (ground scanning) AMM 27-96-00-740-001.
(a) If the ground scanning gives the maintenance message:
R B AIL SERVO VLV 33CE4

Refer to the Para. Fault Isolation.

(b) If the test gives a different maintenance message, do the trouble shooting procedure related to this message.

Subtask 27-10-00-700-095-B ** ON A/C NOT FOR ALL

A. Test
(1) Do a check of the Post Flight Report (PFR)
If the R B AIL SERVO VLV 33CE4 maintenance message is shown in flight phase 08 (PH08):
(a) On the overhead panel, on the FLT CTL panel 24VU: release, then push the FLT CTL/ELAC2 pushbutton switch.
(b) Make an entry in the logbook to monitor the aircraft during the subsequent flight.
(c) During the subsequent flight:

If the fault occurs again, continue the trouble shooting procedure.

(2) Make sure that all the hydraulic systems are depressurized.
(3) On the overhead panel 23VU:

Release the FLT CTL/ELAC 1 pushbutton switch (the OFF legend of the FLT CTL/ELAC 1 pushbutton switch comes on).

(4) On the overhead panel 23VU:

Push the FLT CTL/ELAC 1 pushbutton switch (the OFF legend of the FLT CTL/ELAC 1 pushbutton switch goes off).

NOTE: In case of a reset of the ELAC 1 with the circuit breaker, the supply breaking must be more than 5 seconds.

NOTE: If the ELAC FAULT warning disappears after several resets, replace the computer.

(5) Pressurize all the hydraulic systems AMM 29-10-00-863-001, AMM 29-10-00-863-002 and AMM 29-10-00-863-003.
(6) Do the operational test of the side stick assembly (activation for the BITE test) AMM 27-96-00-710-020.
(7) Do the BITE test of the EFCS (ground scanning) AMM 27-96-00-740-001.
(a) If the ground scanning gives the maintenance message:
R B AIL SERVO VLV 33CE4

Refer to the Para. Fault Isolation.

(b) If the test gives a different maintenance message, do the trouble shooting procedure related to this message.

4. Fault Isolation
Subtask 27-10-00-810-079-A

A. If the test gives the maintenance message:
R B AIL SERVO VLV 33CE4
(1) Do a check of the Previous Leg Reports (PLR) to see if there is the ELAC2 AIL ORDER DISAGREE maintenance message:
(a) If this maintenance message is shown, refer to the trouble shooting procedure (Ref. TSM TASK 27-10-00-810-814).
(b) If this maintenance message is not shown:

Replace the servovalve of the servo control 33CE4 , AMM 27-14-51-000-003 and AMM 27-14-51-400-003.
At the 33CE4 receptacle, do a check of the resistance between pin E and pin F ASM 279303.

NOTE: The resistance must be 500 ohms +/- 10 %.

(2) If the fault continues:

Do a check of the wiring POS XDCR signal from the servocontrol (33CE4) to the ELAC 2 (2CE2) COM and MON side, ASM 279303.

(3) If the fault continues:

Replace the ELAC-2 [2CE2] , AMM 27-93-34-000-001 and AMM 27-93-34-400-001.

(4) If the fault continues:

Replace the SERVO CTL-R AILERON, OUTBD B [33CE4] , AMM 27-14-51-000-001 and AMM 27-14-51-400-001.

Subtask 27-10-00-700-096-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:27:28 UTC