Failure of the Left Blue Aileron Servo Control Servovalve

TASK 27-10-00-810-809-A
Failure of the Left Blue Aileron Servo Control Servovalve

1. Possible Causes

servovalve of the servo control 33CE3
wiring POS XDCR signal from the servocontrol (33CE3) to the ELAC 1 (2CE1) COM and MON side
ELAC-1 [2CE1]
SERVO CTL-L AILERON, OUTBD B [33CE3]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 27-93-00-810-950-A	Disagree between COM and MON Aileron Order Signals in the ELAC1
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 279302
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 27-10-00-700-064-A ** ON A/C NOT FOR ALL

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.

Subtask 27-10-00-700-064-B ** ON A/C NOT FOR ALL

A. Test
(1) Do a check of the Post Flight Report (PFR)
If the L B AIL SERVO VLV 33CE3 maintenance message is shown in flight phase 08 (PH08):
(a) On the overhead panel, on the FLT CTL panel 23VU: release, then push the FLT CTL/ELAC1 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) Do the operational test of the side stick assembly (activation for the BITE test) AMM 27-96-00-710-020.
(3) Do the BITE test of the EFCS (ground scanning) AMM 27-96-00-740-001.

4. Fault Isolation
Subtask 27-10-00-810-058-A

A. If the test gives the maintenance message:
L B AIL SERVO VLV 33CE3
(1) Do a check of the Previous Leg Reports (PLR) to see if there is the ELAC1 AIL ORDER DISAGREE maintenance message:
(a) If this maintenance message is shown, refer to the trouble shooting procedure (Ref. TSM TASK 27-93-00-810-950).
(b) If this maintenance message is not shown:

Replace the servovalve of the servo control 33CE3 , AMM 27-14-51-000-003 and AMM 27-14-51-400-003.
At the 33CE3 receptacle, do a check of the resistance between pin E and pin F ASM 279302.

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 (33CE3) to the ELAC 1 (2CE1) COM and MON side, ASM 279302.

(3) If the fault continues:

Replace the ELAC-1 [2CE1] , AMM 27-93-34-000-001 and AMM 27-93-34-400-001.

(4) If the fault continues:

Replace the SERVO CTL-L AILERON, OUTBD B [33CE3] , AMM 27-14-51-000-001 and AMM 27-14-51-400-001.

Subtask 27-10-00-700-065-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:27:26 UTC