Disagree of the THS Position Indication Between the System Display and the Pitch Trim Control Wheel

TASK 27-40-00-810-809-A
Disagree of the THS Position Indication Between the System Display and the Pitch Trim Control Wheel

1. Possible Causes

ACTUATOR-THS [9CE]

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
0U190360	1	PIN-RIGGING,THS ACTUATOR,MECHANICAL INPUT LEVER
0U190834	1	TOOL-ZERO POSITIONING,THS ACTUATOR

B. Referenced Information

REFERENCE	DESIGNATION
AMM 24-41-00-861-002	Energize the Aircraft Electrical Circuits from the External Power
AMM 27-41-00-820-001	Adjustment of the THS Zero Position
AMM 27-41-00-820-002	Adjustment of the THS Control-Cables Length
AMM 27-41-41-000-001	Removal of the Control Mechanism-Pitch Trim
AMM 27-41-41-400-001	Installation of the Control Mechanism-Pitch Trim
AMM 27-44-51-000-001	Removal of the Trimmable Horizontal Stabilizer (THS) Actuator
AMM 27-44-51-400-001	Installation of the Trimmable Horizontal Stabilizer (THS) Actuator
AMM 29-23-00-863-001	Pressurize the Green Hydraulic System from the Yellow Hydraulic System through the PTU with the Electric Pump
AMM 29-24-00-863-001	Pressurize the Yellow Hydraulic System with the Electric Pump
AMM 31-60-00-860-001	EIS Start Procedure

3. Fault Confirmation
Subtask 27-40-00-860-051-A

A. Job Set-up
Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
AMM 24-41-00-861-002.
(2) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only)
AMM 31-60-00-860-001.
(3) Pressurize the aircraft hydraulic systems
AMM 29-24-00-863-001 AMM 29-23-00-863-001.
(4) On the overhead panel 23VU:

Make sure that the FLT CTL/ELAC1 and FLT CTL/SEC1 pushbutton switches are pushed (the OFF legends of these pushbutton switches are off).

(5) On the overhead panel 24VU:

Make sure that the FLT CTL/ELAC2 and FLT CTL/SEC2 pushbutton switches are pushed (the OFF legends of these pushbutton switches are off).

Subtask 27-40-00-710-050-A

B. Test

ACTION	RESULT
1.On the center pedestal: Move the pitch-trim control wheels in the nose-up direction to the mechanical stop.	On the SD: The PITCH TRIM Indicator shows: 13.5 +0.4 -0.6 deg..
2.On the center pedestal: Move the pitch-trim control wheels in the nose-down direction to the mechanical stop.	On the SD: The PITCH TRIM Indicator shows: 4 +0.3 -0.5 deg..
3.On the center pedestal: Move the pitch-trim control wheels to the 0 position.	On the SD: The PITCH TRIM Indicator shows: 0 +0.3 -0.3 deg..

4. Fault Isolation
Subtask 27-40-00-810-059-A

A. On the SD, if the THS positions are in the tolerances:

No other maintenance action is necessary.

Subtask 27-40-00-810-060-A

B. On the SD, if the THS positions are out of the tolerances:
(1) Install the 0U190834 TOOL-ZERO POSITIONING,THS ACTUATOR on the screw jack of the THS actuator.
(2) Install the 0U190360 PIN-RIGGING,THS ACTUATOR,MECHANICAL INPUT LEVER on the input lever of the THS actuator.
(3) Do the adjustment of the THS zero position AMM 27-41-00-820-001.
(4) Do the adjustment of the THS control cables AMM 27-41-00-820-002.
(5) Remove and install in the correct position the pitch-trim control mechanism AMM 27-41-41-000-001 and AMM 27-41-41-400-001.
(6) If the fault continues:

Replace the ACTUATOR-THS [9CE] AMM 27-44-51-000-001 and AMM 27-44-51-400-001

(7) Remove the 0U190834 TOOL-ZERO POSITIONING,THS ACTUATOR and 0U190360 PIN-RIGGING,THS ACTUATOR,MECHANICAL INPUT LEVER

Subtask 27-40-00-710-051-A

C. Test
Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:27:36 UTC