Failure of the Left Blue Aileron Servo Control Position Transducer

TASK 27-10-00-810-804-A
Failure of the Left Blue Aileron Servo Control Position Transducer

1. Possible Causes

SERVO CTL-L AILERON, OUTBD B [33CE3]
wiring of the POS XDCR SPLY signal from the servo control (33CE3) to the first terminal block
wiring of the POS XDCR, V11, V12, V21, V22 signal from the servo control (33CE3) to the first terminal block

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 27-90-00-810-807-A	Loss of the ACS2 Signal of the ELAC1 COM Side
AMM 27-14-51-000-001	Removal of the Aileron Servo Control
AMM 27-14-51-400-001	Installation of the Aileron Servo Control
ASM 279302
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 27-10-00-700-055-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.

NOTE: If the POST FLIGHT REPORT (PFR) gives also the maintenance message:
R G AIL POS XDCR 33CE2
do this procedure (Ref. TSM TASK 27-90-00-810-807).

4. Fault Isolation
Subtask 27-10-00-810-053-A

A. If the test gives the maintenance message:
L B AIL POS XDCR 33CE3

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

NOTE: The resistance of primary (pins A/B and A/C) and secondary (pins A/A and A/P, pins A/R and A/D) windings of the transducer must be between 30 ohms and 500 ohms. The insulation must be more than 10 Mohms.
These values are given for information only. You can use these values to do checks of the component electrical part or of the wiring before you replace the component. But by this procedure, the check of the component mechanical part is not done.
For primary winding (power supply):

if you do the resistance check from the avionics compartment, you must disconnect the transducer of the Right Green Aileron Servo Control.

(1) If the fault continues:
(a) Do a check of the wiring of the POS XDCR SPLY signal from the servo control (33CE3) to the first terminal block, ASM 279302:

if there is no continuity, repair the wiring
if there is continuity, see Para. (b).

(b) Do a check and repair the wiring of the POS XDCR, V11, V12, V21, V22 signal from the servo control (33CE3) to the first terminal block, ASM 279302.

Subtask 27-10-00-700-056-A

B. Do the test given in Para. 3.

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