Drain and Refill the THS Actuator Gearbox

TASK 27-44-51-610-001-A
Drain and Refill the THS Actuator Gearbox

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: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

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

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

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

ZONE: 310
FIN: 9CE

1. Reason for the Job
Refer to the MPD TASK: 274451-09
DRAIN AND REFILL THS ACTUATOR GEARBOX
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific	1	CONTAINER - HYDRAULIC FLUID RESISTANT
No specific	AR	WARNING NOTICE(S)
0U190364	1	OIL DRAINING TOOL
98D27403500000	1	PITCH TRIM CONTROL LOCKING

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 12-13-27-612-001-A	Oil Replenishment of the THS Actuator
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 27-00-00-080-001-A	Removal of the Pitch-Trim Control Locking Tool (98D27403500000)
TASK 27-00-00-480-001-A	Installation of the Pitch-Trim Control Locking Tool (98D27403500000)
TASK 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 29-23-00-863-001-A	Pressurize the Green Hydraulic System from the Yellow Hydraulic System through the PTU with the Electric Pump
TASK 29-23-00-864-001-A	Depressurize the Green and Yellow Hydraulic Systems after Operation of the PTU
Drainage and Refilling of the Trimmable Horizontal Stabilizer Actuator Gearbox

3. Job Set-up
Subtask 27-44-51-865-060-A

A. Make sure that this(these) circuit breaker(s) is(are) closed:

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
49VU	FLIGHT CONTROLS/SEC1/NORM/SPLY	21CE1	B08
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/ELAC1/NORM/SPLY	15CE1	B06
49VU	FLIGHT CONTROLS/THS/ACTR/MOT2	19CE2	B04
49VU	FLIGHT CONTROLS/SEC1/NORM/SPLY	21CE1	B03
** ON A/C ALL
105VU	FLIGHT CONTROLS/ELAC2/STBY SPLY	16CE2	A02
105VU	FLT CTL/ELAC1/STBY SPLY	16CE1	A01
121VU	FLIGHT CONTROLS/SEC3/SPLY	21CE3	Q19
121VU	FLIGHT CONTROLS/SEC2/SPLY	21CE2	Q18
121VU	FLIGHT CONTROLS/THS ACTR/MOT3	19CE3	Q17
121VU	FLIGHT CONTROLS/THS ACTR/MOT1	19CE1	Q16
121VU	FLIGHT CONTROLS/ELAC2/NORM/SPLY	15CE2	R20

Subtask 27-44-51-860-061-A

B. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).

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.

(2) Pressurize the Yellow and the Green hydraulic systems (Ref. AMM TASK 29-23-00-863-001).
(3) On the center pedestal:
(a) Turn the pitch-trim control-wheel to the nose DN stop position.
(b) Turn the pitch-trim control-wheel to the nose UP stop position.
(c) Do the steps (3) (a) and (b) again.
(d) Turn the pitch-trim control wheel to the 0 position.
(4) Depressurize the Green and Yellow hydraulic systems.
(Ref. AMM TASK 29-23-00-864-001).
(5) Make sure that the hydraulic systems are depressurized and put them in the maintenance configuration
(Ref. AMM TASK 29-00-00-864-001).
(6) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(7) Put WARNING NOTICE(S) in position to tell persons not to pressurize the Green and Yellow hydraulic systems:

in the cockpit on the hydraulic section 40VU on the overhead panel,
on the ground service panels of the Green and Yellow hydraulic systems.

(8) Put the 98D27403500000 PITCH TRIM CONTROL LOCKING on the pitch-trim control-wheel in the cockpit (Ref. AMM TASK 27-00-00-480-001).
(9) Put warning notices in the cockpit to tell persons not to operate the pitch controls.
(10) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position at the access door 312AR.
(11) Open the access door 312AR.

4. Procedure
Subtask 27-44-51-610-050-A

A. Drain and Refill the Trimmable Horizontal Stabilizer Actuator Gearbox
(1) Put a CONTAINER - HYDRAULIC FLUID RESISTANT in position below the THS actuator (1).
(2) Remove the oil drain plug (2) from the oil drain fitting (3).
(3) Remove the oil filler plug (4) from the oil filler fitting (5).
(4) Install the 0U190364 OIL DRAINING TOOL on the oil drain fitting (3).
(5) Drain the oil from the THS actuator (1) into the drainage container.
(6) Remove the 0U190364 OIL DRAINING TOOL.
(7) Install the oil drain plug (2) on the oil drain fitting (3).
(8) Install the oil filler plug (4) on the oil filler fitting (5).
(9) Remove the drainage container.
(10) Fill the THS actuator (1) with the correct oil to the correct level (Ref. AMM TASK 12-13-27-612-001).
(11) Do a visual check of the THS actuator (1) and make sure that there are no leaks from:

The oil filler plug and adaptor,
the oil drain plug.

5. Close-up
Subtask 27-44-51-860-062-A

A. Put the aircraft back to the serviceable condition.
(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 access platform(s).
(4) Remove the 98D27403500000 PITCH TRIM CONTROL LOCKING from the pitch-trim control-wheel in the cockpit (Ref. AMM TASK 27-00-00-080-001).
(5) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 04:32:36 UTC