Removal of the Electronic Modules of the Pitch Trim Actuator

TASK 27-44-57-000-002-A
Removal of the Electronic Modules of the Pitch Trim Actuator

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

WARNING: MAKE SURE THAT THE SAFETY DEVICES AND THE WARNING NOTICES ARE IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

NOTE: This removal procedure is for one of the electronic modules. It is the same for all the electronic modules.

ZONE: 310

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 6M (20 FT) - ADJUSTABLE
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
0U190360	1	PIN-RIGGING,THS ACTUATOR,MECHANICAL INPUT LEVER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
310	FUSLG TAIL SECTION AFT OF AFT PRESS BHD
312AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
Rigging Pin of the Trimmable Horizontal Stabilizer (THS) Actuator
Electronic Module

3. Job Set-up
Subtask 27-44-57-010-051-A

A. Get Access
(1) Put the ACCESS PLATFORM 6M (20 FT) - ADJUSTABLE in position.
(2) Open the access door 312AR.

Subtask 27-44-57-860-051-A

B. Aircraft Maintenance Configuration

Rigging Pin of the Trimmable Horizontal Stabilizer (THS) Actuator

(1) On the center pedestal, make sure that the pitch-trim control wheel is in the zero position.
(2) Make sure that the Green and Yellow hydraulic systems are depressurized and put them in the maintenance configuration (Ref. AMM TASK 29-00-00-864-001).
(3) Put the WARNING NOTICE(S) in position:

On the center pedestal, on the pitch-trim control wheel, to tell persons not to operate it
On the overhead panel, on the HYD section of HYD/FUEL panel 40VU, to tell persons not to pressurize the Green and Yellow hydraulic systems.

(4) Put the 0U190360 PIN-RIGGING,THS ACTUATOR,MECHANICAL INPUT LEVER in the mechanical input of the THS actuator (1).

Subtask 27-44-57-865-053-A

C. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/ELAC1/NORM/SPLY	15CE1	B11
49VU	FLIGHT CONTROLS/THS/ACTR/MOT2	19CE2	B09
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/ELAC1/NORM/SPLY	15CE1	B06
49VU	FLIGHT CONTROLS/THS/ACTR/MOT2	19CE2	B04
** ON A/C ALL
105VU	FLT CTL/ELAC1/STBY SPLY	16CE1	A01
121VU	FLIGHT CONTROLS/THS ACTR/MOT3	19CE3	Q17
121VU	FLIGHT CONTROLS/THS ACTR/MOT1	19CE1	Q16

4. Procedure
Subtask 27-44-57-020-051-A

A. Removal of the Electronic Modules from the Pitch Trim Actuator

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

(1) Remove and discard the lockwire from the bolts (6) and (8).
(2) Hold the electronic module (2) and remove the bolts (6) and (8) and the washers (5) and (7).
(3) Carefully remove the electronic module (2) from the motor assembly (3) and the pitch trim actuator (1).

[Rev.10 from 2021] 2026.03.31 23:51:47 UTC