Loss of the Signal of the Right Blue Elevator-Servocontrol Servovalve by the ELAC 1

TASK 27-93-00-810-873-A
Loss of the Signal of the Right Blue Elevator-Servocontrol Servovalve by the ELAC 1

1. Possible Causes

servovalve
ELAC-1 [2CE1]
wiring of the R ELEV SV (ANO 2) signal from the ELAC 1 (2CE1) COM part, pins AB/2J, 2H to the ELAC 1 COM part, pins AA/3H, 3G
wiring from the ELAC 1 (2CE1) COM part to the MON part
wiring from the ELAC 1 (2CE1) MON part, pins AD/3D, 4D to the first terminal block
wiring of the LVDT SV SPLY signal
wiring of the LVDT POS (ANI 3-2) signal
SERVO CTL-R ELEVATOR, OUTBD B [34CE4]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 27-34-51-000-001	Removal of the Elevator Servo Control
AMM 27-34-51-000-008	Removal of the Elevator Servo Control Actuator Servo Valve
AMM 27-34-51-400-001	Installation of the Elevator Servo Control
AMM 27-34-51-400-003	Installation of the Elevator Servo Control Actuator Servo Valve
ASM 279307
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 27-93-00-700-130-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.

4. Fault Isolation
Subtask 27-93-00-810-120-A

A. If the test gives the maintenance message:
ELAC1 COM OR WIRING TO R B ELEV SERVO VLV 34CE4

Replace the servovalve AMM 27-34-51-000-008 AMM 27-34-51-400-003.

(1) If the fault continues:

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

(2) If the fault continues:
(a) Do a check of the wiring of the R ELEV SV (ANO 2) signal from the ELAC 1 (2CE1) COM part, pins AB/2J, 2H to the ELAC 1 COM part, pins AA/3H, 3G ASM 279307:

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

(b) Do a check of the wiring from the ELAC 1 (2CE1) COM part to the MON part from pins AA/3J, 3K to pins AD/3B, 4B ASM 279307:

if there is continuity see Para. (c)
if there is no continuity repair the above wiring.

if there is continuity see Para. (d)
if there is no continuity repair the above wiring.

(d) Do a check of the wiring of the LVDT SV SPLY signal , from the servocontrol (34CE4) to the first terminal block ASM 279307.

if there is continuity see Para. (e)
if there is no continuity repair the above wiring.

(e) Do a check of the wiring of the LVDT POS (ANI 3-2) signal, from the ELAC 1 (2CE1) MON part to the servocontrol (34CE4) ASM 279307.

if there is continuity see Para. (3)
if there is no continuity repair the above wiring.

(3) Replace the SERVO CTL-R ELEVATOR, OUTBD B [34CE4] AMM 27-34-51-000-001 and AMM 27-34-51-400-001.

Subtask 27-93-00-700-131-A

B. Do the tests given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:28:00 UTC