Incorrect Position of the THS for the SEC 2

TASK 27-40-00-810-805-A
Incorrect Position of the THS for the SEC 2

1. Possible Causes

RELAY-PITCH TRIM ACTUATOR MOTOR 3 SPLY [36CE3]
SEC-2 [1CE2]
electronic module N°3 of the pitch trim actuator
monitor position transducer of the THS actuator
wiring from the relay (36CE3), pin A/X2 to the ground
wiring from the relay (36CE3) to the SEC 2 (1CE2)
wiring from the THS actuator pin D/J to the ground
wiring from the relay (36CE3) to the THS actuator (9CE)
wiring from the relay (36CE3) A/A2 to the C/B (19CE3)
wiring of the XDCR MON MOT 3 (V1, V2) signal

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 27-44-56-000-001	Removal of the Position Transducer from the THS Actuator
AMM 27-44-56-400-001	Installation of the Position Transducer to the THS Actuator
AMM 27-44-57-000-001	Removal of the Pitch Trim Actuator from the THS Actuator
AMM 27-44-57-000-002	Removal of the Electronic Modules of the Pitch Trim Actuator
AMM 27-44-57-400-001	Installation of the Pitch Trim Actuator to the THS Actuator
AMM 27-44-57-400-002	Installation of the Electronic Modules of the Pitch Trim Actuator
AIPC 27920803
ASM 279413
AMM 27-94-34-000-001	Removal of the SEC
AMM 27-94-34-400-001	Installation of the SEC
AMM 27-96-00-710-022	Operational Test of the THS Actuator Electrical Control (Activation for BITE Test)
AMM 27-96-00-740-001	BITE Test of the EFCS (Ground Scanning)

3. Fault Confirmation
Subtask 27-40-00-700-058-A

A. Test
(1) Do the operational test of the THS actuator electrical control AMM 27-96-00-710-022.

NOTE: Do the ground setting only with the SEC 2.

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

4. Fault Isolation
Subtask 27-40-00-810-054-A

A. If the BITE test gives the maintenance message:
THS ACTR POS ERROR 9CE OF SEC2
(1) Remove the RELAY-PITCH TRIM ACTUATOR MOTOR 3 SPLY [36CE3] AIPC 27920803.
(2) Do a check of the resistance between pins X1 and X2.
(a) If the resistance is less than 280 ohms:

Replace the RELAY-PITCH TRIM ACTUATOR MOTOR 3 SPLY [36CE3]
Replace the SEC-2 [1CE2] AMM 27-94-34-000-001 AMM 27-94-34-400-001.

(b) If the resistance is more than 400 ohms:

Replace the RELAY-PITCH TRIM ACTUATOR MOTOR 3 SPLY [36CE3] .

Install the RELAY-PITCH TRIM ACTUATOR MOTOR 3 SPLY [36CE3]
Go to para (3).

(3) If the fault continues:

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 electronic module N°3 of the pitch trim actuator AMM 27-44-57-000-002 and AMM 27-44-57-400-002.

(5) If the fault continues:

Replace the pitch trim actuator AMM 27-44-57-000-001 AMM 27-44-57-400-001.

(6) If the fault continues:

Replace the monitor position transducer of the THS actuator AMM 27-44-56-000-001 and AMM 27-44-56-400-001.

(7) If the fault continues:

Replace the RELAY-PITCH TRIM ACTUATOR MOTOR 3 SPLY [36CE3] AIPC 27920803.

(8) If the fault continues:

Do a check of the wiring from the relay (36CE3), pin A/X2 to the ground ASM 279413.
Do a check of the wiring from the relay (36CE3) to the SEC 2 (1CE2), from the pin A/X1 to the pin AE/13E ASM 279413.

(a) If there is no continuity, repair the wiring.
(b) If there is continuity:

Do a check of the wiring from the THS actuator pin D/J to the ground ASM 279413.
Do a check of the wiring from the relay (36CE3) to the THS actuator (9CE), from the pin A/A1 to the pin D/H ASM 279413.

1 If there is no continuity, repair the wiring.
2 If there is continuity:

Do a check of the wiring from the relay (36CE3) A/A2 to the C/B (19CE3) ASM 279413.

a If there is no continuity, repair the wiring.
b If there is continuity:

Do a check and repair the wiring of the XDCR MON MOT 3 (V1, V2) signal, from THS actuator (9CE) to the SEC 2 (1CE2) ASM 279413.

Subtask 27-40-00-700-059-A

B. Do the tests given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:27:35 UTC