DOC AIRBUS | TSM A320FStiffness of the Pitch-Trim Control Wheel
TASK 27-40-00-810-808-A
Stiffness of the Pitch-Trim Control Wheel
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Fault Confirmation
Subtask 27-40-00-720-050-A
[Rev.8 from Aug 2018]
2026.04.04 04:27:36 UTC
Stiffness of the Pitch-Trim Control Wheel
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 ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE.
1. Possible Causes2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| 0U190360 | 1 | PIN-RIGGING,THS ACTUATOR,MECHANICAL INPUT LEVER |
| 98D27403000000 | 1 | HOLDING TOOL-TRIM CTL LOWER SHAFT |
| REFERENCE | DESIGNATION |
|---|---|
| AMM 27-41-00-210-001 | Detailed Visual Inspection of the THS Mechanical Control |
| AMM 27-41-00-220-001 | Check of the Cable Tension Regulator of the THS Trim Control (Pointer in the Limits) |
| AMM 27-41-00-720-001 | Functional Test of the THS-Actuator Overtravel Related to the Mechanical Indicator |
| AMM 27-41-00-730-001 | System Test of the THS Actuator Electrical Control |
| AMM 27-41-41-000-001 | Removal of the Control Mechanism-Pitch Trim |
| AMM 27-41-41-400-001 | Installation of the Control Mechanism-Pitch Trim |
| AMM 27-41-42-000-001 | Removal of the Cable Tension Regulator |
| AMM 27-41-42-400-001 | Installation of the Cable Tension Regulator |
| AMM 27-41-43-000-001 | Removal of the Pitch Trim Control Stop and Gearset Unit |
| AMM 27-41-43-400-001 | Installation of the Pitch Trim Control Stop and Gearset Unit |
| AMM 27-41-44-000-001 | Removal of the THS Control Cables |
| AMM 27-41-44-400-001 | Installation of the THS Control Cables |
| AMM 27-44-51-000-001 | Removal of the Trimmable Horizontal Stabilizer (THS) Actuator |
| AMM 27-44-51-400-001 | Installation of the Trimmable Horizontal Stabilizer (THS) Actuator |
| AMM 27-44-57-000-001 | Removal of the Pitch Trim Actuator from the THS Actuator |
| AMM 27-44-57-400-001 | Installation of the Pitch Trim Actuator to the THS Actuator |
| AMM 29-23-00-863-001 | Pressurize the Green Hydraulic System from the Yellow Hydraulic System through the PTU with the Electric Pump |
| AMM 29-23-00-864-001 | Depressurize the Green and Yellow Hydraulic Systems after Operation of the PTU |
| AMM 29-24-00-863-001 | Pressurize the Yellow Hydraulic System with the Electric Pump |
| AMM 29-24-00-864-001 | Depressurize the Yellow Hydraulic System |
| AMM 53-59-00-210-001 | Operational Check of Single Drain Pipe Aft of FR70 from Outside |
THS Mechanical ControlSubtask 27-40-00-720-050-A
A. Test
4. Fault IsolationNOTE: Make sure that there is no message on EFCS LAST LEG REPORT
(1) Do a functional test of the THS-actuator overtravel related to the mechanical indicator AMM 27-41-00-720-001. WARNING:
MAKE SURE THAT THE ELAC'S ARE ELECTRICALLY ISOLATED DURING WORK ON THE MECHANICAL CONTROL SYSTEM OF THE THS.
IF NOT, PARTS CAN MOVE AND CAUSE INJURY AND/OR DAMAGE.
Subtask 27-40-00-865-050-A A. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
Subtask 27-40-00-810-057-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | FLIGHT CONTROLS/ELAC1/NORM/SPLY | 15CE1 | B11 |
| 49VU | FLIGHT CONTROLS/THS/ACTR/MOT2 | 19CE2 | B09 |
| 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. If you find stiffness:
(1) Make sure that there is no water or ice in the lower area of the tail cone.
(a) If you find water or ice, remove it and check that the drain tube is not clogged AMM 53-59-00-210-001.
(2) Do a check of the pitch-trim control wheel and cable linkage
(a) Disconnect the shaft (2) from the THS actuator (1) (see detail A).
1 put the pitch-trim control wheel in the zero position.
2 put the 0U190360 PIN-RIGGING,THS ACTUATOR,MECHANICAL INPUT LEVER (8) in position on the THS actuator (1).
3 disconnect the mechanical system link-plate (7) from the input lever (9)
4 move the pitch-trim control wheel and go back to the neutral position.
. if you do not find stiffness : see Para. (3)
. if you find stiffness : see Para. (b).
(b) disconnect the shaft (4) from the stop and gearset unit (5) (see detail B):
1 install the 98D27403000000 HOLDING TOOL-TRIM CTL LOWER SHAFT on the drive shaft (4).
2 install the standard locking bolt (10) on the chain (11).
3 remove the tapered pin (12).
4 move the pitch-trim control wheel and go back to the neutral position
. if you do not find stiffness : see Para. (d)
. if you find stiffness : see Para. (c)
(c) Check of the mechanical part failure of the pitch-trim control mechanism (6) and the stop and gearset unit (5).
1 do this corrective action:
. install the tapered pin (12)
. remove the standard locking bolt (10)
. remove the trim-control lower shaft holding-tool
3 connect the shaft (2) to the THS actuator (1)
. connect the mechanical system link-plate (7) to the input lever (9)
. remove the THS-actuator mechanical input lever rigging-pin (8)
4 do the test given in Para. C.
(d) Check of the cable tension regulator
2 make sure that the rigging scale index is in the correct position on the cable tension regulator.
3 do a check of the cable tension regulator of the THS trim control AMM 27-41-00-220-001
. if OK : see Para. (e)
. if not OK : do this corrective action:
a replace the cable tension regulator if necessary AMM 27-41-42-000-001 and AMM 27-41-42-400-001.
b connect the shaft (2) to the THS actuator (1)
. connect the mechanical system link-plate (7) to the input lever (9)
. remove the THS-actuator, mechanical input lever rigging-pin (8).
c Do the test given in Para. C.
(e) Check of the THS mechanical control:
2 do the check of the bearings of the shafts (2) and (4).
3 Install the THS control cables AMM 27-41-44-400-001.
4 connect the shaft (4) to the stop and gearset unit (5).
. install the tapered pin (12)
. remove the standard locking bolt (10).
. remove the trim-control lower shaft holding-tool
5 connect the shaft (2) to the THS actuator (1)
. connect the mechanical system link-plate (7) to the input lever (9)
6 Do the test given in Para. C.
(3) Check of the THS actuator
(a) connect the shaft (2) to the THS actuator (1)
. connect the mechanical system link-plate (7) to the input lever (9)
. remove the THS actuator mechanical input lever rigging-pin (8).
(b) remove the pitch trim actuator from the THS actuator (9CE) AMM 27-44-57-000-001.
(c) Pressurize the Green and Yellow hydraulic systems AMM 29-23-00-863-001 and AMM 29-24-00-863-001.
(d) Move the pitch-trim control wheel and go back to the neutral position.
1 If you do not find stiffness:
a Depressurize the Green and Yellow hydraulic systems AMM 29-23-00-864-001 and AMM 29-24-00-864-001.
b replace the pitch trim actuator of the THS actuator (9CE) AMM 27-44-57-000-001 and AMM 27-44-57-400-001
c Do the test given in Para. C.
2 If you find stiffness:
a Replace the THS actuator (9CE) AMM 27-44-51-000-001 and AMM 27-44-51-400-001.
b Do the test given in Para. C.
3 If you do not find stiffness:
Subtask 27-40-00-720-051-A (1) Make sure that there is no water or ice in the lower area of the tail cone.
(a) If you find water or ice, remove it and check that the drain tube is not clogged AMM 53-59-00-210-001.
(2) Do a check of the pitch-trim control wheel and cable linkage
(a) Disconnect the shaft (2) from the THS actuator (1) (see detail A).
1 put the pitch-trim control wheel in the zero position.
2 put the 0U190360 PIN-RIGGING,THS ACTUATOR,MECHANICAL INPUT LEVER (8) in position on the THS actuator (1).
3 disconnect the mechanical system link-plate (7) from the input lever (9)
4 move the pitch-trim control wheel and go back to the neutral position.
. if you do not find stiffness : see Para. (3)
. if you find stiffness : see Para. (b).
(b) disconnect the shaft (4) from the stop and gearset unit (5) (see detail B):
1 install the 98D27403000000 HOLDING TOOL-TRIM CTL LOWER SHAFT on the drive shaft (4).
2 install the standard locking bolt (10) on the chain (11).
3 remove the tapered pin (12).
4 move the pitch-trim control wheel and go back to the neutral position
. if you do not find stiffness : see Para. (d)
. if you find stiffness : see Para. (c)
(c) Check of the mechanical part failure of the pitch-trim control mechanism (6) and the stop and gearset unit (5).
1 do this corrective action:
- replace the pitch-trim control mechanism (6) AMM 27-41-41-000-001 and AMM 27-41-41-400-001
or - replace the pitch trim control stop and gearset unit (5) AMM 27-41-43-000-001 and AMM 27-41-43-400-001.
. install the tapered pin (12)
. remove the standard locking bolt (10)
. remove the trim-control lower shaft holding-tool
3 connect the shaft (2) to the THS actuator (1)
. connect the mechanical system link-plate (7) to the input lever (9)
. remove the THS-actuator mechanical input lever rigging-pin (8)
4 do the test given in Para. C.
(d) Check of the cable tension regulator
- do a visual inspection of the cable tension regulator (3)
2 make sure that the rigging scale index is in the correct position on the cable tension regulator.
3 do a check of the cable tension regulator of the THS trim control AMM 27-41-00-220-001
. if OK : see Para. (e)
. if not OK : do this corrective action:
a replace the cable tension regulator if necessary AMM 27-41-42-000-001 and AMM 27-41-42-400-001.
b connect the shaft (2) to the THS actuator (1)
. connect the mechanical system link-plate (7) to the input lever (9)
. remove the THS-actuator, mechanical input lever rigging-pin (8).
c Do the test given in Para. C.
(e) Check of the THS mechanical control:
- do a visual inspection of the THS mechanical control AMM 27-41-00-210-001.
2 do the check of the bearings of the shafts (2) and (4).
3 Install the THS control cables AMM 27-41-44-400-001.
4 connect the shaft (4) to the stop and gearset unit (5).
. install the tapered pin (12)
. remove the standard locking bolt (10).
. remove the trim-control lower shaft holding-tool
5 connect the shaft (2) to the THS actuator (1)
. connect the mechanical system link-plate (7) to the input lever (9)
6 Do the test given in Para. C.
(3) Check of the THS actuator
(a) connect the shaft (2) to the THS actuator (1)
. connect the mechanical system link-plate (7) to the input lever (9)
. remove the THS actuator mechanical input lever rigging-pin (8).
(b) remove the pitch trim actuator from the THS actuator (9CE) AMM 27-44-57-000-001.
(c) Pressurize the Green and Yellow hydraulic systems AMM 29-23-00-863-001 and AMM 29-24-00-863-001.
(d) Move the pitch-trim control wheel and go back to the neutral position.
1 If you do not find stiffness:
a Depressurize the Green and Yellow hydraulic systems AMM 29-23-00-864-001 and AMM 29-24-00-864-001.
b replace the pitch trim actuator of the THS actuator (9CE) AMM 27-44-57-000-001 and AMM 27-44-57-400-001
c Do the test given in Para. C.
2 If you find stiffness:
a Replace the THS actuator (9CE) AMM 27-44-51-000-001 and AMM 27-44-51-400-001.
b Do the test given in Para. C.
3 If you do not find stiffness:
- do the test given in Para. C.