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 flexible tube
 No specific lint-free cloth
 No specific optical probe
 No specific paper filter
 No specific warning notices
 No specific container 4.0 l (1.0566 USgal)
 No specific access platform 5.5 m (18 ft. 1 in.)
 No specific Torque Wrench : range 0.20 to 3.60 m.daN

 (2.00 to 26.00 lbf.ft) 0U190364 1 TOOL - OIL DRAINING, THS ACTUATOR 0U190844 2 RELEASE TOOL - PRESSURE-OFF BRAKE, THS ACTUATOR
 B. Consumable Materials
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
No specific  lockwire, corrosion-resistant steel, 0.6 mm (0.024 in.)
 C. Expendable Parts
 -------------------------------------------------------------------------------FIG.ITEM |DESIGNATION |IPC-CSN -------------------------------------------------------------------------------
2 O-rings 27-44-51 02 -060 4 O-ring 27-44-51 02 -100 R

 D. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
12-13-27-612-001 Oil Replenishment of the THS Actuator (9CE) 27-41-00-730-001 System Test of the THS Actuator Electrical Control 27-44-51-000-001 Removal of the Trimmable Horizontal Stabilizer (THS)
 Actuator (9CE) 27-44-51-400-001 Installation of the Trimmable Horizontal Stabilizer
 (THS) Actuator (9CE) R 27-44-51-710-001 Operational Test of the No-Back Device (No-Back R Pawls)
 29-00-00-864-001 Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action 27-44-51-991-015 Fig. 607
 3. Job Set-up
__________
 Subtask 27-44-51-860-053
 A. Aircraft Maintenance Configuration
 (1)
 Make sure that the Green hydraulic system is depressurized and put it in the maintenance configuration. (Ref. TASK 29-00-00-864-001).

 (2)
 Make sure that the Yellow hydraulic system is depressurized and put it in the maintenance configuration. (Ref. TASK 29-00-00-864-001).

 (3)
 Put warning notices 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.
 (4) Put warning notices in the cockpit to tell persons not to operate the pitch controls.
 Subtask 27-44-51-010-061
 B. Get Access
 (1)
 Put the access platform in position at the access door 312AR.

 (2)
 Open the access door 312AR.

 4. Procedure
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 (Ref. Fig. 607/TASK 27-44-51-991-015) Subtask 27-44-51-210-058
 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 metal particles which are larger than 2 mm (0.0787 in.) by 1 mm (0.0393 in.), do a boroscope inspection as written below.

 (4)
 If you do not find metal particles larger than given above, continue as follows:

 (a) Clean the magnetic chip detector with a lint-free cloth.
 (b) Connect the drain plug (5) to the actuator housing. Subtask 27-44-51-290-050
 B. Do a Boroscope Inspection of the Power Gears
 (1)
 Put a container below the connection of the drain plug to collect the drained oil.

 (2)
 Connect the TOOL - OIL DRAINING, THS ACTUATOR (0U190364) to the opening of the drain plug.

 (3)
 Use a flexible tube 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 TOOL - OIL DRAINING, THS ACTUATOR and the flexible tube from the opening of the drain plug.

 (6)
 Remove the container with the drained oil.
　
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