DOC AIRBUS | AMM A320FInspection of the Magnetic Chip Detector and Boroscope Inspection of the Power Gear of the THS-Actuator
TASK 27-44-51-200-002-A
Inspection of the Magnetic Chip Detector and Boroscope Inspection of the Power Gear of the THS-Actuator
1. Reason for the Job
Self Explanatory
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 27-44-51-860-053-A
Subtask 27-44-51-210-058-A
Subtask 27-44-51-410-060-A
[Rev.10 from 2021]
2026.04.01 06:54:45 UTC
Inspection of the Magnetic Chip Detector and Boroscope Inspection of the Power Gear of the THS-Actuator
1. Reason for the Job
Self Explanatory
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 | BORESCOPE - FLEXIBLE |
| No specific | 1 | CONTAINER 4 L (1 USGAL) |
| No specific | 1 | HOSE - DRAIN |
| No specific | 1 | PAPER - FILTER |
| No specific | AR | WARNING NOTICE(S) |
| No specific | Torque wrench: range to between 1.6 and 1.4 m.daN (11.80 and 10.32 lbf.ft )  | |
| No specific | Torque wrench: range to between 2.2 and 1.8 m.daN (16.22 and 13.27 lbf.ft ) | |
| 0U190364 | 1 | OIL DRAINING TOOL |
| 0U190844 | 2 | TOOL-RELEASE,POB |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.14SBA1) | Textile-Lint free Cotton - |
| No specific | lockwire, corrosion-resistant steel, 0.6 mm (0.024 in.) |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 310 | FUSLG TAIL SECTION AFT OF AFT PRESS BHD |
| 312AR |
| FIG.ITEM | DESIGNATION | IPC-CSN |
|---|---|---|
| 2 | O-RINGS | AIPC 27-44-51-02-060 |
| 4 | O-RING | AIPC 27-44-51-02-100 |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 12-13-27-612-001-A | Oil Replenishment of the THS Actuator |
| TASK 27-41-00-730-001-A | System Test of the THS Actuator Electrical Control |
| 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 27-44-51-710-001-A | Operational Check of THS Actuator No-Back Device |
| TASK 29-00-00-864-001-A | Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action |
Inspection of the Magnetic Detector and Boroscope Inspection of the THS-ActuatorSubtask 27-44-51-860-053-A
A. Aircraft Maintenance Configuration
(1) Make sure that the Green hydraulic system is depressurized and put it in the maintenance configuration.
(Ref. AMM TASK 29-00-00-864-001).
(2) Make sure that the Yellow hydraulic system is depressurized and put it in the maintenance configuration.
(Ref. AMM TASK 29-00-00-864-001).
(3) Put WARNING NOTICE(S) in position to tell persons not to pressurize the Green and Yellow hydraulic systems:
Subtask 27-44-51-010-061-A (1) Make sure that the Green hydraulic system is depressurized and put it in the maintenance configuration.
(Ref. AMM TASK 29-00-00-864-001).
(2) Make sure that the Yellow hydraulic system is depressurized and put it in the maintenance configuration.
(Ref. AMM TASK 29-00-00-864-001).
(3) 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.
B. Get Access
(1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position at the access door 312AR.
(2) Open the access door 312AR.
4. Procedure(1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position at the access door 312AR.
(2) Open the access door 312AR.
Subtask 27-44-51-210-058-A
A. Do an Inspection of the Magnetic Chip Detector
(1) Disconnect the drain plug (5) from the actuator housing.
(2) Examine the magnetic chip detector for metal particles.
(3) If you find unusually large quantities of metal particles or metal particles which are larger than 2 mm (0.0787 in.) by 1 mm (0.0394 in.), replace the THS-Actuator (Ref. AMM TASK 27-44-51-000-001) and (Ref. AMM TASK 27-44-51-400-001).
(4) If you you do not find unusually large quantities of metal particles or metal particles which are larger than 2 mm (0.0787 in.) by 1 mm (0.0394 in.), continue as follows:
(a) Clean the magnetic chip detector with a Textile-Lint free Cotton - (Material No.14SBA1) .
(b) Connect the drain plug (5) to the actuator housing.
Subtask 27-44-51-290-050-A (1) Disconnect the drain plug (5) from the actuator housing.
(2) Examine the magnetic chip detector for metal particles.
(3) If you find unusually large quantities of metal particles or metal particles which are larger than 2 mm (0.0787 in.) by 1 mm (0.0394 in.), replace the THS-Actuator (Ref. AMM TASK 27-44-51-000-001) and (Ref. AMM TASK 27-44-51-400-001).
(4) If you you do not find unusually large quantities of metal particles or metal particles which are larger than 2 mm (0.0787 in.) by 1 mm (0.0394 in.), continue as follows:
(a) Clean the magnetic chip detector with a Textile-Lint free Cotton - (Material No.14SBA1) .
(b) Connect the drain plug (5) to the actuator housing.
B. Do a Boroscope Inspection of the Power Gears
(1) Put a CONTAINER 4 L (1 USGAL) below the connection of the drain plug to collect the drained oil.
(2) Connect the 0U190364 OIL DRAINING TOOL to the opening of the drain plug.
(3) Use a HOSE - DRAIN and drain the oil from the gearbox through a PAPER - FILTER into the container.
(4) Examine the paper filter for metal particles.
(5) Disconnect the 0U190364 OIL DRAINING TOOL and the flexible tube from the opening of the drain plug.
(6) Remove the container with the drained oil.
(7) Cut the lockwire and remove the inspection plugs (1) with the O-ring (2).
(8) Cut the lockwire and remove the plug (3) with the O-ring (4).
(9) Discard the O-rings (2),(4).
(10) Install the 0U190844 TOOL-RELEASE,POB (Ref. AMM TASK 27-44-51-710-001).
(11) Put an BORESCOPE - FLEXIBLE into the inspection holes of the gearbox and examine the teeth of the power gears.
(12) Put a socket wrench in the opening of the manual drive input.
(13) Use the socket wrench and turn the manual drive input.
(14) Examine the teeth of the power gear while you turn the manual drive input.
(16) If you find chipped gear teeth, replace the THS-actuator (Ref. AMM TASK 27-44-51-000-001) and (Ref. AMM TASK 27-44-51-400-001).
(a) Connect the drain plug (5).
(b) Install the inspection plugs (1) with the new AIPC 27-44-51-02-060 O-RINGS (2).
(c) TORQUE the plug (1) to between 2.2 and 1.8 m.daN (16.22 and 13.27 lbf.ft ) and s4fety it with lockwire, corrosion-resistant steel, 0.6 mm (0.024 in.)
(d) Install the plug (3) with the new AIPC 27-44-51-02-100 O-RING (4).
(e) TORQUE the plug (3) to between 1.6 and 1.4 m.daN (11.80 and 10.32 lbf.ft ) and safety it with lockwire, corrosion-resistant steel, 0.6 mm (0.024 in.)
(f) Remove the 0U190844 TOOL-RELEASE,POB (Ref. AMM TASK 27-44-51-710-001).
(g) Fill the THS-actuator with oil (Ref. AMM TASK 12-13-27-612-001).
(h) Do the system test of the THS-mechanical control (Ref. AMM TASK 27-41-00-730-001).
(i) If the system test shows a defect, replace the THS-actuator (Ref. AMM TASK 27-44-51-000-001) and (Ref. AMM TASK 27-44-51-400-001).
5. Close-up(1) Put a CONTAINER 4 L (1 USGAL) below the connection of the drain plug to collect the drained oil.
(2) Connect the 0U190364 OIL DRAINING TOOL to the opening of the drain plug.
(3) Use a HOSE - DRAIN and drain the oil from the gearbox through a PAPER - FILTER into the container.
(4) Examine the paper filter for metal particles.
(5) Disconnect the 0U190364 OIL DRAINING TOOL and the flexible tube from the opening of the drain plug.
(6) Remove the container with the drained oil.
(7) Cut the lockwire and remove the inspection plugs (1) with the O-ring (2).
(8) Cut the lockwire and remove the plug (3) with the O-ring (4).
(9) Discard the O-rings (2),(4).
(10) Install the 0U190844 TOOL-RELEASE,POB (Ref. AMM TASK 27-44-51-710-001).
(11) Put an BORESCOPE - FLEXIBLE into the inspection holes of the gearbox and examine the teeth of the power gears.
(12) Put a socket wrench in the opening of the manual drive input.
(13) Use the socket wrench and turn the manual drive input.
(14) Examine the teeth of the power gear while you turn the manual drive input.
NOTE: Do the inspection thru both inspection holes.
(15) Turn the manual drive input to the zero position. (16) If you find chipped gear teeth, replace the THS-actuator (Ref. AMM TASK 27-44-51-000-001) and (Ref. AMM TASK 27-44-51-400-001).
NOTE: Do not clean the magnetic chip detectors. They may be the basis of a subsequent analysis.
(17) If you have not found defects of the gear teeth, continue as follows: (a) Connect the drain plug (5).
(b) Install the inspection plugs (1) with the new AIPC 27-44-51-02-060 O-RINGS (2).
(c) TORQUE the plug (1) to between 2.2 and 1.8 m.daN (16.22 and 13.27 lbf.ft )
and s4fety it with lockwire, corrosion-resistant steel, 0.6 mm (0.024 in.)(d) Install the plug (3) with the new AIPC 27-44-51-02-100 O-RING (4).
(e) TORQUE the plug (3) to between 1.6 and 1.4 m.daN (11.80 and 10.32 lbf.ft )
and safety it with lockwire, corrosion-resistant steel, 0.6 mm (0.024 in.)(f) Remove the 0U190844 TOOL-RELEASE,POB (Ref. AMM TASK 27-44-51-710-001).
(g) Fill the THS-actuator with oil (Ref. AMM TASK 12-13-27-612-001).
(h) Do the system test of the THS-mechanical control (Ref. AMM TASK 27-41-00-730-001).
(i) If the system test shows a defect, replace the THS-actuator (Ref. AMM TASK 27-44-51-000-001) and (Ref. AMM TASK 27-44-51-400-001).
Subtask 27-44-51-410-060-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 access platform(s).
(4) Remove the WARNING NOTICE(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 access platform(s).
(4) Remove the WARNING NOTICE(S).