Loss of the Signal of the Left Blue Elevator-Servocontrol Solenoid Valve by the SEC 2

TASK 27-30-00-810-811-A
Loss of the Signal of the Left Blue Elevator-Servocontrol Solenoid Valve by the SEC 2

CAUTION: DO NOT SWAP FLIGHT CONTROL COMPUTERS. IF THERE IS A SHORT CIRCUIT, YOU WILL CAUSE DAMAGE TO A SERVICEABLE COMPUTER WHEN YOU SWAP THEM.

1. Possible Causes

solenoid valve of the servocontrol 34CE3
SERVO CTL-L ELEVATOR, OUTBD B [34CE3]
SEC-2 [1CE2]
wiring of the SOL VLV2 signal from the servocontrol (34CE3) to the SEC2 (1CE2)
wiring from the SEC2 (1CE2) COM part to the SEC2 MON part
ELAC-1 [2CE1]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 27-34-51-000-001	Removal of the Elevator Servo Control
AMM 27-34-51-000-005	Removal of the Solenoid Valve of the Elevator Servo-Control Actuator
AMM 27-34-51-400-001	Installation of the Elevator Servo Control
AMM 27-34-51-400-004	Installation of the Solenoid Valve of the Elevator Servo-Control Actuator
AMM 27-93-34-000-001	Removal of the ELAC
AMM 27-93-34-400-001	Installation of the ELAC
ASM 279408
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 27-30-00-700-066-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 and FLT CTL/ELAC 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 27-30-00-810-058-A

A. If the test gives the maintenance message:
SEC2 MON OR WIRING TO L B ELEV SOL VLV 34CE3
(1) Remove the SEC2 AMM 27-94-34-000-001.
(2) At the SEC2 receptacle, do a check of the resistance between the pin AB/14D and the pin AE/14G ASM 279408.

NOTE: The resistance must be between 40 and 100 Ohms.

(a) If the resistance is less than 40 Ohms:

at the outboard elevator servocontrol (34CE3), do a check of the resistance of the solenoid valve between the pin C/J and the pin C/U ASM 279408.

NOTE: The resistance must be between 40 and 100 Ohms.

1 If the resistance values are out of the specified limits:
a Replace the solenoid valve of the servocontrol 34CE3 AMM 27-34-51-000-005 and AMM 27-34-51-400-004.
b Do again a check of the resistance of the solenoid valve between the pin C/J and the pin C/U of the outboard elevator servocontrol (34CE3) (40 to 100 Ohms).

If the resistance values are out of the specified limits:
. Replace the SERVO CTL-L ELEVATOR, OUTBD B [34CE3] AMM 27-34-51-000-001 and AMM 27-34-51-400-001.
. Replace the SEC-2 [1CE2] AMM 27-94-34-000-001 and AMM 27-94-34-400-001.
If the resistance values are in the specified limits:
Replace the SEC-2 [1CE2] AMM 27-94-34-000-001 and AMM 27-94-34-400-001.

2 If the resistance values are in the specified limits:
a Repair the wiring of the SOL VLV2 signal from the servocontrol (34CE3) to the SEC2 (1CE2), from the pin C/J to the pin AB/14D and from the pin C/U to the pin AE/14G ASM 279408:
b Replace the SEC-2 [1CE2] AMM 27-94-34-000-001 and AMM 27-94-34-400-001.
(b) If the resistance is more than 100 Ohms:

at the outboard elevator servocontrol (34CE3), do a check of the resistance of the solenoid valve between the pin C/J and the pin C/U ASM 279408.

NOTE: The resistance must be between 40 and 100 Ohms.

If the resistance values are out of the specified limits:
. Replace the SERVO CTL-L ELEVATOR, OUTBD B [34CE3] AMM 27-34-51-000-001 and AMM 27-34-51-400-001.
. Install the SEC2 AMM 27-94-34-400-001.
If the resistance values are in the specified limits:
Install the SEC2 AMM 27-94-34-400-001.

2 If the resistance values are in the specified limits:
a Repair the wiring of the SOL VLV2 signal from the servocontrol (34CE3) to the SEC2 (1CE2), from the pin C/J to the pin AB/14D and from the pin C/U to the pin AE/14G ASM 279408:
b Install the SEC2 AMM 27-94-34-400-001.
(c) If the resistance values are in the specified limits:

See Para. (3).

(3) At the SEC2 receptacle, do a check of the insulation between pin AE/14G (pin AB/14D) and the ground.

NOTE: The resistance must be more than 100 Meghoms.

(a) If the resistance is more than 100 Megohms:

Replace the SEC-2 [1CE2] AMM 27-94-34-000-001 and AMM 27-94-34-400-001.

1 If the fault continues:

Replace the solenoid valve AMM 27-34-51-000-005 and AMM 27-34-51-400-004.

2 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.

3 do a check of the wiring from the SEC2 (1CE2) COM part to the SEC2 MON part, from the pin AB/11F to the pin AE/14E ASM 279408:
a If the wiring is correct:

replace the SEC-2 [1CE2] AMM 27-94-34-000-001 and AMM 27-94-34-400-001.

b If the wiring is not correct:

repair it
install the SEC2 AMM 27-94-34-400-001.

(b) If the resistance is less than 100 Meghoms:

At the SERVO CTL-L ELEVATOR, OUTBD B [34CE3] , do a check of the insulation between pin C/U (pin C/J) and the ground.

1 If the resistance is less than 100 Megohms:

Replace the solenoid valve AMM 27-34-51-000-005 and AMM 27-34-51-400-004.

a Do again a check of the insulation of the solenoid valve between pin C/U (pin C/J) and the ground.

If the resistance is less than 100 Megohms:
. Replace the SERVO CTL-L ELEVATOR, OUTBD B [34CE3] AMM 27-34-51-000-001 and AMM 27-34-51-400-001.
. Replace the SEC-2 [1CE2] AMM 27-94-34-000-001 and AMM 27-94-34-400-001.

2 If the resistance is more than 100 Meghoms:
a Repair the wiring of the solenoid valve signal from the SERVO CTL-L ELEVATOR, OUTBD B [34CE3] to the SEC-2 [1CE2] .
b Replace the SEC-2 [1CE2] AMM 27-94-34-000-001 and AMM 27-94-34-400-001.
(4) If the fault continues:

replace the ELAC-1 [2CE1] , (MON part relay K1), AMM 27-93-34-000-001 and AMM 27-93-34-400-001.

Subtask 27-30-00-700-067-A

B. Do the tests given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:27:31 UTC