DOC AIRBUS | AMM A320FOperational Check of THS Actuator No-Back Device
TASK 27-44-51-710-001-A
Operational Check of THS Actuator No-Back Device
Refer to the MPD TASK: 274400-03
OPERATIONAL CHECK OF THS ACTUATOR NO-BACK DEVICE
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Expendable Parts
E. Referenced Information
3. Job Set-up
Subtask 27-44-51-010-058-A
Subtask 27-44-51-710-050-A
Subtask 27-44-51-865-053-A
[Rev.10 from 2021]
2026.03.31 23:51:23 UTC
Operational Check of THS Actuator No-Back Device
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 TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.
ZONE: 310
1. Reason for the JobRefer to the MPD TASK: 274400-03
OPERATIONAL CHECK OF THS ACTUATOR NO-BACK DEVICE
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 | AR | SAFETY CLIP - CIRCUIT BREAKER |
| No specific | AR | WARNING NOTICE(S) |
| No specific | Torque wrench: range to between 0.50 and 0.35 m.daN (44.25 and 30.97 lbf.in )  | |
| No specific | Torque wrench: range to between 1.6 and 1.4 m.daN (11.80 and 10.32 lbf.ft ) | |
| 0U145506 | 1 | CONE-MOUNTING, THS ACTUATOR |
| 0U190844 | 1 | TOOL-RELEASE,POB |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.03ABB1) | Synthetic base Lubricating Oil-Turbine Engine Low Temp. - |
| (Material No.14QEB1) | Wire-Locking Dia: 0.6 mm CRES Nickel Alloy - |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 310 | FUSLG TAIL SECTION AFT OF AFT PRESS BHD |
| 312AR |
| FIG.ITEM | DESIGNATION | IPC-CSN |
|---|---|---|
| 4 | O-RING | AIPC 27-44-51-02-100 |
| REFERENCE | DESIGNATION |
|---|---|
Location of the Manual Drive Input and the Installation of the Release Tool of the Pressure-Off BrakeSubtask 27-44-51-010-058-A
A. Get Access
(1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position.
(2) Open the access door 312AR.
(3) Put the WARNING NOTICE(S) in the cockpit to tell persons not to operate the pitch controls.
Subtask 27-44-51-865-052-A (1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position.
(2) Open the access door 312AR.
(3) Put the WARNING NOTICE(S) in the cockpit to tell persons not to operate the pitch controls.
B. Open, safety and tag this(these) circuit breaker(s):
4. Procedure| 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 27-44-51-710-050-A
A. Operational Test
(1) Cut, remove and discard the lockwire at the plug (3) of the manual drive input.
(2) Remove the plug (3) from the manual drive input of the THS actuator (1).
(3) Remove and discard the O-ring (4) from the plug (3).
(4) Install the 0U190844 TOOL-RELEASE,POB on the control piston (2) of one of the two pressure-off brakes as follows:
(a) Install the shaft on the thread of the control piston (2).
(b) Put the collar in position on the shaft and install the command nut.
(c) Make sure that the collar has contact with the housing and there is a gap between the spring pin and the collar.
(d) Make sure that the command nut has contact with the collar.
(e) TORQUE the command nut to between 0.50 and 0.35 m.daN (44.25 and 30.97 lbf.in ) (agrees with half a turn of the command nut) to release the pressure-off brake.
(5) Put the socket wrench in position at the manual drive input.
(6) Use the socket wrench to turn the manual drive input (a maximum of half a revolution), very slowly, in one direction and then in the other direction.
(a) When the manual drive input turns, make sure that you can hear the operation noise of the ratchet wheels from the top of the THS actuator unit (a ticking noise).
(8) Remove the socket wrench from the manual drive input.
(9) Apply Synthetic base Lubricating Oil-Turbine Engine Low Temp. - (Material No.03ABB1) to the new AIPC 27-44-51-02-100 O-RING (4).
(10) Use the 0U145506 CONE-MOUNTING, THS ACTUATOR and put the O-ring (4) on the plug (3).
(11) Install the plug (3) in the manual drive input.
(12) TORQUE the plug (3) to between 1.6 and 1.4 m.daN (11.80 and 10.32 lbf.ft ).
(13) Safety the plug (3) with lockwire14QEB1 Wire-Locking Dia: 0.6 mm CRES Nickel Alloy -
5. Close-up(1) Cut, remove and discard the lockwire at the plug (3) of the manual drive input.
(2) Remove the plug (3) from the manual drive input of the THS actuator (1).
(3) Remove and discard the O-ring (4) from the plug (3).
(4) Install the 0U190844 TOOL-RELEASE,POB on the control piston (2) of one of the two pressure-off brakes as follows:
(a) Install the shaft on the thread of the control piston (2).
(b) Put the collar in position on the shaft and install the command nut.
(c) Make sure that the collar has contact with the housing and there is a gap between the spring pin and the collar.
(d) Make sure that the command nut has contact with the collar.
(e) TORQUE the command nut to between 0.50 and 0.35 m.daN (44.25 and 30.97 lbf.in )
(agrees with half a turn of the command nut) to release the pressure-off brake. (5) Put the socket wrench in position at the manual drive input.
(6) Use the socket wrench to turn the manual drive input (a maximum of half a revolution), very slowly, in one direction and then in the other direction.
(a) When the manual drive input turns, make sure that you can hear the operation noise of the ratchet wheels from the top of the THS actuator unit (a ticking noise).
NOTE: When you turn the manual drive input in the clockwise or counter- clockwise directions, an intermitted resistance to the movement can occur, due to compression of hydraulic fluid in the hydraulic motors.
(7) Remove the 0U190844 TOOL-RELEASE,POB from the control piston (2). (8) Remove the socket wrench from the manual drive input.
(9) Apply Synthetic base Lubricating Oil-Turbine Engine Low Temp. - (Material No.03ABB1) to the new AIPC 27-44-51-02-100 O-RING (4).
(10) Use the 0U145506 CONE-MOUNTING, THS ACTUATOR and put the O-ring (4) on the plug (3).
(11) Install the plug (3) in the manual drive input.
(12) TORQUE the plug (3) to between 1.6 and 1.4 m.daN (11.80 and 10.32 lbf.ft )
. (13) Safety the plug (3) with lockwire
Subtask 27-44-51-865-053-A
A. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 27-44-51-410-058-A | 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 |
B. 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).
(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).