W DOC AIRBUS | AMM A320F

Check Oil Level of THS Actuator Gearbox

TASK 27-44-51-210-004-A
Check Oil Level of THS Actuator Gearbox

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.
MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.
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.
WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
NOTE: Determine the part number of the installed THS actuator. With the part number refer to the MPD for the correct interval.
ZONE: 311
ZONE: 312
FIN: 9CE
1. Reason for the Job
Refer to the MPD TASK: 274451-02
CHECK OIL LEVEL OF THS ACTUATOR GEARBOX
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
MAT - PROTECTIVE
No specific
1
WARNING NOTICE(S)
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.08BAA9)
Non Aqueous Cleaner-General - -
 C. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
311
AFT FUSLG TAIL SECTION
312
AFT FUSLG TAIL SECTION
312AR
 D. Referenced Information
REFERENCE
DESIGNATION
TASK 12-13-27-612-001-A
Oil Replenishment of the THS Actuator
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 27-44-56-000-001-A
Removal of the Position Transducer from the THS Actuator
TASK 27-44-56-400-001-A
Installation of the Position Transducer to the THS Actuator
TASK 27-44-57-000-001-A
Removal of the Pitch Trim Actuator from the Trimmable Horizontal Stabilizer (THS) Actuator
TASK 27-44-57-400-001-A
Installation of the Pitch Trim Actuator on the Trimmable Horizontal Stabilizer (THS) Actuator
TASK 29-00-00-864-001-A
Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
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 29-23-00-863-002-A
Pressurize the Yellow Hydraulic System from the Green Hydraulic System through the PTU with the Ground Service Cart
F THS Actuator 9CE - Gearbox Oil-Sight-Level
3. Job Set-up
Subtask 27-44-51-941-072-A
A. Aircraft Maintenance Configuration
   (1) Put the WARNING NOTICE(S) in the flight compartment to tell persons not to operate the pitch controls.
   (2) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position.
Subtask 27-44-51-010-059-A
B. Get Access
   (1) Open access door 312AR.
   (2) Put the MAT - PROTECTIVE in the area of the Trimmable Horizontal Stabilizer (THS) actuator to prevent damage to the structure.
4. Procedure
Subtask 27-44-51-860-067-A
A. Preparation for the Check of the Oil Level of the THS Actuator Gearbox
   (1) Pressurize the Green and the Yellow hydraulic systems (Ref. AMM TASK 29-23-00-863-001) and (Ref. AMM TASK 29-23-00-863-002).
   (2) For the correct check of the oil level it is necessary to do the steps that follow:
     (a) Turn the pitch-trim control wheel in the flight compartment and move the THS actuator a minimum of:
  • Three times from the fully UP position to the fully DOWN position.
     (b) Turn the pitch-trim control wheel in the flight compartment and move the THS actuator to the zero position.
   (3) Depressurize the Green and Yellow hydraulic systems and put them in the maintenance configuration (Ref. AMM TASK 29-00-00-864-001).
   (4) Put the WARNING NOTICE(S) in position to tell persons not to pressurize the Green, the Yellow and the Blue hydraulic systems:
  • In the cockpit on the hydraulic section 40VU of the overhead panel
  • On the ground service panels of the Green, the Yellow and the Blue hydraulic systems.
   (5) On the fuselage tail cone, make sure that the THS is opposite the 0 mark.
   (6) Make sure that the aircraft is in a horizontal position.
   (7) Clean the sight glass (41) and the adjacent area with the Non Aqueous Cleaner-General - - (Material No.08BAA9) and let it dry.
Subtask 27-44-51-210-057-A
B. Do a Check of the Oil Level of the THS Actuator Gearbox
   (1) Do a check of the oil level through the oil sight glass (40) approximately one hour after the last movement of the THS actuator.
NOTE: This time is necessary for the level of the oil to become stable.
NOTE: Carbon dust from the carbon discs can make the oil black in color. This change of color is usual. You can continue this procedure.
NOTE: The minimum level mark of the oil sight glass (40) can be MINI or 90cc in relation to the type of sight glass.
   (2) If the oil level is between the minimum mark and the maximum mark, fill the THS actuator gearbox until the oil level is correct (Ref. AMM TASK 12-13-27-612-001).
     (a) If the ambient air temperature is less than 10 deg.C (50.00 deg.F), we recommend that you fill the THS actuator gearbox to a level of 1.5 mm (0.0591 in.) below the maximum mark.
     (b) If the ambient air temperature is between 10 deg.C (50.00 deg.F) and 30 deg.C (86.00 deg.F), we recommend that you fill the THS actuator gearbox to the maximum mark.
     (c) If the ambient air temperature is more than 30 deg.C (86.00 deg.F), we recommend that you fill the THS actuator gearbox to a level of 1.5 mm (0.0591 in.) above the maximum mark.
     (d) Do the close-up procedure (refer to Para. 5.).
   (3) If the oil level is below the minimum mark, do a check for an external oil leak of the THS actuator gearbox.
   (4) If you do not find an external oil leak, fill the THS actuator gearbox until the oil level is correct (Ref. AMM TASK 12-13-27-612-001).
     (a) Measure and record the quantity of oil that you add into the THS actuator gearbox:
       1 If the ambient air temperature is less than 10 deg.C (50.00 deg.F), we recommend that you fill the THS actuator gearbox to a level of 1.5 mm (0.0591 in.) below the maximum mark.
       2 If the ambient air temperature is between 10 deg.C (50.00 deg.F) and 30 deg.C (86.00 deg.F), we recommend that you fill the THS actuator gearbox to the maximum mark.
       3 If the ambient air temperature is more than 30 deg.C (86.00 deg.F), we recommend that you fill the THS actuator gearbox to a level of 1.5 mm (0.0591 in.) above the maximum mark.
     (b) If the added oil quantity is less than 90 cm3 (5.49 in.3), no other checks are necessary.
     (c) If the added oil quantity is more than 440 cm3 (26.85 in.3), replace the THS actuator (Ref. AMM TASK 27-44-51-000-001) and (Ref. AMM TASK 27-44-51-400-001).
     (d) If the added oil quantity is more than 90 cm3 (5.49 in.3) but less than 440 cm3 (26.85 in.3):
       1 If you find oil:
       2 If you do not find oil:
         a If you find oil:
         b If you do not find oil:
  • During the time before you replace the THS actuator, do checks of the oil level in the THS actuator gearbox at regular intervals. Refer to the table that follows for the intervals between the checks for a given quantity of added oil.
Quantity of added oil
Intervals between oil level checks
90 to 180 cm3 (5.50 to 11.00 in.3)
150 flight hours
180 to 440 cm3 (11.00 to 26.80 in.3)
One day
5. Close-up
Subtask 27-44-51-410-059-A
A. Close Access
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Remove the MAT - PROTECTIVE.
   (3) Close access door 312AR.
Subtask 27-44-51-942-070-A
B. Put the aircraft back to the serviceable condition.
   (1) Remove the WARNING NOTICE(S).
   (2) Remove the access platform(s).
[Rev.10 from 2021] 2026.03.31 23:51:27 UTC
"Aviabrain" 2025