DOC AIRBUS | AMM A320FLubricate THS Actuator Ball Screw Nut
TASK 12-22-27-640-003-A
Lubricate THS Actuator Ball Screw Nut
Refer to the MPD TASK: 274451-01
LUBRICATE THS ACTUATOR BALL SCREW NUT
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Referenced Information
3. Job Set-up
Subtask 12-22-27-941-053-A
Subtask 12-22-27-640-052-A
(3) Use a GUN - GREASE and apply the new Synthetic Ester base Grease-General Purpose Low Temp - (Material No.03HBD9) or Synthetic Oil base Grease-General Purpose Lithium Thickened Low Temp. - (Material No.03GBC1) through the grease nipple of the ball-screw nut. Apply the grease until it comes out through the vent hole.
(5) Use a GUN - GREASE and apply more new Synthetic Ester base Grease-General Purpose Low Temp - (Material No.03HBD9) or Synthetic Oil base Grease-General Purpose Lithium Thickened Low Temp. - (Material No.03GBC1) through the grease nipple of the ball-screw nut. Continue to apply grease until approximately 50 cm3 (3.05 in.3) of the grease comes out through the vent hole.
(7) Clean the unwanted grease from the grease nipple and the ball-screw nut with a lint-free cotton cloth Textile-Lint free Cotton - (Material No.14SBA1) .
(8) Make sure the travel range of the THS actuator ball-screw nut is clear.
Subtask 12-22-27-865-066-A
Subtask 12-22-27-410-053-A
[Rev.10 from 2021]
2026.03.31 22:56:33 UTC
Lubricate THS Actuator Ball Screw Nut
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.
WARNING:
MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
ZONE: 310
1. Reason for the JobRefer to the MPD TASK: 274451-01
LUBRICATE THS ACTUATOR BALL SCREW NUT
NOTE: The effectivity of this task is "ALL". To know if this task is applicable to your aircraft, refer to the MPD task applicability.
2. Job Set-up InformationA. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE |
| No specific | 1 | CONTAINER 1 L (1/4 USGAL) |
| No specific | 1 | GUN - GREASE |
| No specific | 1 | PIN - NON METALLIC |
| No specific | AR | SAFETY BARRIER(S) |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| No specific | AR | WARNING NOTICE(S) |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.03GBC1) | Synthetic Oil base Grease-General Purpose Lithium Thickened Low Temp. - |
| (Material No.03HBD9) | Synthetic Ester base Grease-General Purpose Low Temp - |
| (Material No.14SBA1) | Textile-Lint free Cotton - |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 310 | FUSLG TAIL SECTION AFT OF AFT PRESS BHD |
| 312AR |
| REFERENCE | DESIGNATION |
|---|---|
| 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 27-44-51-000-001-A | Removal of the Trimmable Horizontal Stabilizer (THS) Actuator |
| TASK 27-44-51-400-001-A | Installation of the Trimmable Horizontal Stabilizer (THS) Actuator |
| 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 |
| TASK 29-24-00-863-001-A | Pressurize the Yellow Hydraulic System with the Electric Pump |
| TASK 29-24-00-864-001-A | Depressurize the Yellow Hydraulic System |
| TASK 31-60-00-860-001-A | EIS Start Procedure |
| TASK 31-60-00-860-002-A | EIS Stop Procedure |
| TASK 12-22-00-00 | LUBRICATION - DESCRIPTION AND OPERATION |
Trimmable Horizontal Stabilizer (THS) Actuator.Subtask 12-22-27-941-053-A
A. Safety Precautions
(1) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(2) Put a WARNING NOTICE(S) in the cockpit to tell persons not to start the Auxiliary Power Unit (APU).
(3) Put a WARNING NOTICE(S) in the cockpit to tell persons not to operate the Trimmable Horizontal Stabilizer (THS).
Subtask 12-22-27-865-054-A (1) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(2) Put a WARNING NOTICE(S) in the cockpit to tell persons not to start the Auxiliary Power Unit (APU).
(3) Put a WARNING NOTICE(S) in the cockpit to tell persons not to operate the Trimmable Horizontal Stabilizer (THS).
B. Open, safety and tag this(these) circuit breaker(s):
Subtask 12-22-27-010-053-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | FLIGHT CONTROLS/THS/ACTR/MOT2 | 19CE2 | B09 |
| ** ON A/C NOT FOR ALL | |||
| 49VU | FLIGHT CONTROLS/THS/ACTR/MOT2 | 19CE2 | B04 |
| ** ON A/C ALL | |||
| 121VU | FLIGHT CONTROLS/THS ACTR/MOT3 | 19CE3 | Q17 |
| 121VU | FLIGHT CONTROLS/THS ACTR/MOT1 | 19CE1 | Q16 |
C. Get Access
(1) Put the ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE below access door 312AR.
(2) Open access door 312AR.
4. Procedure(1) Put the ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE below access door 312AR.
(2) Open access door 312AR.
Subtask 12-22-27-640-052-A
WARNING:
WHEN YOU DO A MAINTENANCE TASK THAT USES A GREASE GUN, OBEY THE MANUFACTURER'S SAFETY AND HEALTH RECOMMENDATIONS.
GREASE GUNS USE HIGH PRESSURE IN OPERATION. THIS CAN CAUSE INJURIES TO PERSONNEL OR DAMAGE TO EQUIPMENT.
A. Lubricate the Trimmable Horizontal Stabilizer (THS) Actuator Ball Screw Nut NOTE: For lubricant grease specification and lubrication requirements, refer to (Ref. AMM D/O 12-22-00-00).
(1) Use a clean lint-free cotton cloth Textile-Lint free Cotton - (Material No.14SBA1) to remove the grease from the surfaces adjacent to the ball-screw nut bottom seal and top seal and from the surfaces of:- The ball screw
- The thread of the ball screw
- The primary ballnut
- The secondary nut
- The grease nipple
- The vent hole.
(3) Use a GUN - GREASE and apply the new Synthetic Ester base Grease-General Purpose Low Temp - (Material No.03HBD9) or Synthetic Oil base Grease-General Purpose Lithium Thickened Low Temp. - (Material No.03GBC1) through the grease nipple of the ball-screw nut. Apply the grease until it comes out through the vent hole.
NOTE: It is normal that some grease also comes out through the top/bottom nut seals.
(4) Put a CONTAINER 1 L (1/4 USGAL) in position below the vent hole. (5) Use a GUN - GREASE and apply more new Synthetic Ester base Grease-General Purpose Low Temp - (Material No.03HBD9) or Synthetic Oil base Grease-General Purpose Lithium Thickened Low Temp. - (Material No.03GBC1) through the grease nipple of the ball-screw nut. Continue to apply grease until approximately 50 cm3 (3.05 in.3) of the grease comes out through the vent hole.
NOTE: Grease can come out from the ball-screw nut vent hole or the top/bottom nut seals. If grease leaks from a different position, you must replace the THS Actuator (Ref. AMM TASK 27-44-51-000-001) (Ref. AMM TASK 27-44-51-400-001).
(6) Remove the GUN - GREASE and make sure that the ball in the grease nipple closes correctly after lubrication. (7) Clean the unwanted grease from the grease nipple and the ball-screw nut with a lint-free cotton cloth Textile-Lint free Cotton - (Material No.14SBA1) .
(8) Make sure the travel range of the THS actuator ball-screw nut is clear.
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 12-22-27-865-067-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | FLIGHT CONTROLS/THS/ACTR/MOT2 | 19CE2 | B09 |
| ** ON A/C NOT FOR ALL | |||
| 49VU | FLIGHT CONTROLS/THS/ACTR/MOT2 | 19CE2 | B04 |
| ** ON A/C ALL | |||
| 121VU | FLIGHT CONTROLS/THS ACTR/MOT3 | 19CE3 | Q17 |
| 121VU | FLIGHT CONTROLS/THS ACTR/MOT1 | 19CE1 | Q16 |
C. Make sure that this(these) circuit breaker(s) is(are) closed:
Subtask 12-22-27-860-053-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 121VU | FLIGHT CONTROLS/ELAC2/NORM/SPLY | 15CE2 | R20 |
D. Cycle the Trimmable Horizontal Stabilizer (THS)
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) On the FLT CTL panel 23VU:
(5) On the center pedestal, on the Electronic Centralized Aircraft Monitoring (ECAM) control panel, push (in) the F/CTL pushbutton switch. On the lower ECAM display unit, the F/CTL page comes into view.
(6) Pressurize the Green and the Yellow hydraulic systems (Ref. AMM TASK 29-23-00-863-001) (Ref. AMM TASK 29-24-00-863-001).
(7) On the center pedestal, use the pitch-trim control wheel to operate the THS through one full cycle as follows:
(9) Do the Electronic Instrument System (EIS) stop procedure (Ref. AMM TASK 31-60-00-860-002).
(10) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(11) Make sure the warning notice(s) are in position.
Subtask 12-22-27-865-068-A (1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) On the FLT CTL panel 23VU:
- make sure that the FLT CTL/ELAC 1 and FLT CTL/SEC 1 pushbutton switches are pushed in. On these pushbutton switches, the OFF and FAULT legends are off.
- make sure that the FLT CTL/ELAC 2 and FLT CTL/SEC 2 pushbutton switches are pushed in. On these pushbutton switches, the OFF and FAULT legends are off.
(5) On the center pedestal, on the Electronic Centralized Aircraft Monitoring (ECAM) control panel, push (in) the F/CTL pushbutton switch. On the lower ECAM display unit, the F/CTL page comes into view.
(6) Pressurize the Green and the Yellow hydraulic systems (Ref. AMM TASK 29-23-00-863-001) (Ref. AMM TASK 29-24-00-863-001).
(7) On the center pedestal, use the pitch-trim control wheel to operate the THS through one full cycle as follows:
- slowly move the THS to the 13.5 degree UP stop
- slowly move the THS to the 4 degree DN stop
- slowly move the THS back to the 0 position.
(9) Do the Electronic Instrument System (EIS) stop procedure (Ref. AMM TASK 31-60-00-860-002).
(10) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(11) Make sure the warning notice(s) are in position.
E. Open, safety and tag this(these) circuit breaker(s):
Subtask 12-22-27-640-058-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | FLIGHT CONTROLS/THS/ACTR/MOT2 | 19CE2 | B09 |
| ** ON A/C NOT FOR ALL | |||
| 49VU | FLIGHT CONTROLS/THS/ACTR/MOT2 | 19CE2 | B04 |
| ** ON A/C ALL | |||
| 121VU | FLIGHT CONTROLS/THS ACTR/MOT3 | 19CE3 | Q17 |
| 121VU | FLIGHT CONTROLS/THS ACTR/MOT1 | 19CE1 | Q16 |
F. Lubricate the Trimmable Horizontal Stabilizer (THS) Actuator Ball Screw Nut
(1) Lubricate the THS actuator ball-screw nut again as given in Paragraph 4A from step (2) to step (8).
5. Close-up(1) Lubricate the THS actuator ball-screw nut again as given in Paragraph 4A from step (2) to step (8).
Subtask 12-22-27-410-053-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.
Subtask 12-22-27-865-055-A (1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access door 312AR.
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 12-22-27-942-053-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | FLIGHT CONTROLS/THS/ACTR/MOT2 | 19CE2 | B09 |
| ** ON A/C NOT FOR ALL | |||
| 49VU | FLIGHT CONTROLS/THS/ACTR/MOT2 | 19CE2 | B04 |
| ** ON A/C ALL | |||
| 121VU | FLIGHT CONTROLS/THS ACTR/MOT3 | 19CE3 | Q17 |
| 121VU | FLIGHT CONTROLS/THS ACTR/MOT1 | 19CE1 | Q16 |
C. Removal of Equipment
(1) Remove the safety barriers.
(2) Remove the WARNING NOTICE(S).
(3) Remove the access platform(s).
(4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(1) Remove the safety barriers.
(2) Remove the WARNING NOTICE(S).
(3) Remove the access platform(s).
(4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.