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

TASK 27-94-00-810-921-A
Loss of the Signal of the Right Blue Elevator-Servocontrol Servovalve by the SEC 1

1. Possible Causes

SEC-1 [1CE1]
wiring of the SV XDCR (LVDT) V1 (34CE4) signal from the SEC 1 (1CE1) to the first terminal bock
wiring of the SV XDCR (LVDT) SPLY (34CE4) signal from the SEC 1 (1CE1) to the first terminal bock
wiring of the POS XDCR MON (RVDT) (49CE2) signal from the SEC1 (1CE1) to the first terminal bock
wiring of the POS XDCR COM (RVDT) (34CE4) from the SEC 1 (1CE1) to the first terminal bock

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
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 27-94-00-700-135-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 27-94-00-810-166-A

A. If the test gives the maintenance message:
SEC1-MON OR WIRING TO R B ELEV SERVO VLV 34CE4

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

(1) If the fault continues:
(a) Do a check of the wiring of the SV XDCR (LVDT) V1 (34CE4) signal from the SEC 1 (1CE1) to the first terminal bock ASM 279407:

If there is continuity, go to Para. (b)
If there is no continuity, repair the above wiring.

(b) Do a check of the wiring of the SV XDCR (LVDT) SPLY (34CE4) signal from the SEC 1 (1CE1) to the first terminal bock ASM 279407:

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

(c) Do a check of the wiring of the POS XDCR MON (RVDT) (49CE2) signal from the SEC1 (1CE1) to the first terminal bock ASM 279407:

If there is continuity, go to Para. (d)
If there is no continuity, repair the above wiring.

(d) Do a check and repair the wiring of the POS XDCR COM (RVDT) (34CE4) from the SEC 1 (1CE1) to the first terminal bock ASM 279407.

Subtask 27-94-00-700-136-A

B. Do the tests given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:28:22 UTC