Loss of the Signal of the Left Blue Elevator-Servocontrol Servovalve by the SEC 1

TASK 27-30-00-810-807-A
Loss of the Signal of the Left Blue Elevator-Servocontrol Servovalve by the SEC 1

1. Possible Causes

SEC-1 [1CE1]
servovalve
wiring of L ELEV SV (ANO 1) signal from the SEC 1 (1CE1) COM part to the MON part
wiring from the SEC 1 (1CE1) MON part, pins AD/1F, 1G to the first terminal block
wiring of the LVDT SV SPLY signal
wiring of the LVDT POS (ANI 3-1) signal
SERVO CTL-L ELEVATOR, OUTBD B [34CE3]

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 279407
AMM 27-94-34-000-001	Removal of the SEC
AMM 27-94-34-400-001	Installation of the SEC
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 27-30-00-700-058-A

A. Test
(1) Do the operational test of the side stick assembly (Activation for the BITE test) AMM 27-96-00-710-020.

NOTE: Before you start the operational test procedure, release the FLT CTL/ELAC 1, FLT CTL/ELAC 2 and FLT CTL/SEC 2 pushbutton switches (on these pushbutton switches the OFF legends come on).

(2) Do the BITE test of the EFCS (ground scanning) AMM 27-96-00-740-001.

4. Fault Isolation
Subtask 27-30-00-810-054-A

A. If the test gives the maintenance message:
SEC1 COM OR WIRING TO L B ELEV SERVO VLV 34CE3

Replace the SEC-1 [1CE1] AMM 27-94-34-000-001 and AMM 27-94-34-400-001.

(1) If the fault continues:

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

(2) If the fault continues:
(a) Do a check and repair the wiring of L ELEV SV (ANO 1) signal from the SEC 1 (1CE1) COM part to the MON part, from pins AA/1A, 1B to pins AD/1J, 1K ASM 279407.
(b) Do a check and repair the wiring from the SEC 1 (1CE1) MON part, pins AD/1F, 1G to the first terminal block ASM 279407.
(c) Do a check and repair the wiring of the LVDT SV SPLY signal , from the servocontrol (34CE3) to the first terminal block ASM 279407.
(d) Do a check and repair the wiring of the LVDT POS (ANI 3-1) signal, from the SEC 1 (1CE1) MON part to the servocontrol (34CE3) ASM 279407.
(3) If the fault continues:

replace the SERVO CTL-L ELEVATOR, OUTBD B [34CE3] AMM 27-34-51-000-001 and AMM 27-34-51-400-001.

Subtask 27-30-00-700-059-A

B. Do the tests given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:27:30 UTC