Installation of the Pitch Trim Actuator on the Trimmable Horizontal Stabilizer (THS) Actuator

TASK 27-44-57-400-001-A
Installation of the Pitch Trim Actuator on the Trimmable Horizontal Stabilizer (THS) Actuator

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.

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: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 310
FIN: 9CE

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

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 0.94 and 0.76 m.daN (83.19 and 67.26 lbf.in )
0U190360	1	PIN-RIGGING,THS ACTUATOR,MECHANICAL INPUT LEVER

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.08BBB1)	Non Aqueous Cleaner-- Petroleum Based -
(Material No.14QEB1)	Wire-Locking Dia: 0.6 mm CRES Nickel Alloy -

C. Work Zones and Access Panels

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

D. Referenced Information

REFERENCE	DESIGNATION
TASK 27-41-00-730-001-A	System Test of the THS Actuator Electrical Control
TASK 27-44-51-210-004-A	Check Oil Level of THS Actuator Gearbox
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
Pitch Trim Actuator

3. Job Set-up
Subtask 27-44-57-860-053-A

A. 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 the Yellow hydraulic systems are depressurized and put them in the maintenance configuration (Ref. AMM TASK 29-00-00-864-001).
(3) Make sure that the WARNING NOTICE(S) are 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 the Yellow hydraulic systems.

(4) Make sure that the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE is in position below access door 312AR.
(5) Make sure that access door 312AR is open.
(6) Make sure that the 0U190360 PIN-RIGGING,THS ACTUATOR,MECHANICAL INPUT LEVER is in the mechanical input of the THS actuator (1).

Subtask 27-44-57-865-051-A

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

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 27-44-57-910-050-A

A. Preparation for the Installation
(1) Clean the interface of the THS actuator (1) and the pitch trim actuator (2) with Non Aqueous Cleaner-- Petroleum Based - (Material No.08BBB1) and let it dry.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Make sure that the parts retained from the removed component are clean and in the correct condition.
(4) Make sure that all the electrical connections are clean and in the correct condition.

Subtask 27-44-57-420-050-A

B. Installation of the Pitch Trim Actuator (PTA)

CAUTION: ALIGN THE INPUT SHAFT SPLINES OF THE THS-ACTUATOR WITH THE DRIVING GEAR SPLINES OF THE PTA. THIS WILL PREVENT DAMAGE TO THE PTA.

(1) Put the pitch trim actuator (2) in position at the THS actuator (1).
(2) Make sure that the splines of the pitch trim actuator (2) align with the splines of the THS actuator (1).
(3) If necessary, turn the mechanical input of the THS actuator to align the splines.
(4) Install the screws (11) and the washers (12) to attach the pitch trim actuator (2) at the THS actuator (1).
(5) TORQUE the screws (11) to between 0.94 and 0.76 m.daN (83.19 and 67.26 lbf.in )

.
(6) Safety the screws (11) with lockwire 0.6 mm (0.0236 in.) 14QEB1Wire-Locking Dia: 0.6 mm CRES Nickel Alloy -.
(7) Remove the blanking caps and connect the electrical connectors (3),(4),(5),(6) to the receptacles (7),(8),(9),(10).

Subtask 27-44-57-860-054-A

C. Preparation for the Test
(1) Make sure that the THS actuator 9CE has the correct quantity of oil (Ref. AMM TASK 27-44-51-210-004).
(2) Remove the 0U190360 PIN-RIGGING,THS ACTUATOR,MECHANICAL INPUT LEVER from the mechanical input of the THS actuator 9CE.
(3) Make sure that the travel range of the THS actuator 9CE and the control surfaces are free.

Subtask 27-44-57-865-052-A

D. Remove the safety clip(s) and the tag(s) and close 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

Subtask 27-44-57-720-050-A

E. Do the system test of the THS actuator electrical control (Ref. AMM TASK 27-41-00-730-001).

5. Close-up
Subtask 27-44-57-410-050-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access door 312AR.
(3) Remove the WARNING NOTICE(S).
(4) Remove the access platform(s).

[Rev.10 from 2021] 2026.03.31 23:51:45 UTC