W DOC AIRBUS | AMM A320F

Detailed Inspection of the Upper and Lower THS-Actuator Attachments (Primary and Secondary)

TASK 27-44-51-220-002-A
Detailed Inspection of the Upper and Lower THS-Actuator Attachments (Primary and Secondary)

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: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
ZONE: 310
FIN: 9CE
1. Reason for the Job
Refer to the MPD TASK: 274451-05
DETAILED INSPECTION OF UPPER AND LOWER THS ACTUATOR ATTACHMENT (PRIMARY AND SECONDARY)
NOTE: If you want to do this inspection at the same time as MPD tasks 274451-10-1 and 274451-11-1, make sure that:
  • You do the inspections that are given in MPD tasks 274451-10-1 and 274451-11-1 first.
  • You do not clean the attachments before you do this inspection.
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
FLASHLIGHT
No specific
AR
MAT - PROTECTIVE
No specific
AR
WARNING NOTICE(S)
98D27403500000
1
PITCH TRIM CONTROL LOCKING
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.08BBB1)
Non Aqueous Cleaner-- Petroleum Based -
 C. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
310
FUSLG TAIL SECTION AFT OF AFT PRESS BHD
197CB, 197EB, 198CB, 312AR
 D. Referenced Information
REFERENCE
DESIGNATION
TASK 24-41-00-862-002-A
De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01
De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02
De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 27-00-00-080-001-A
Removal of the Pitch-Trim Control Locking Tool (98D27403500000)
TASK 27-00-00-480-001-A
Installation of the Pitch-Trim Control Locking Tool (98D27403500000)
TASK 29-00-00-864-001-A
Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
F THS Actuator 9CE with the Electrical Load Sensing Device (ELSD) ** ON A/C NOT FOR ALL
F THS Actuator 9CE ** ON A/C NOT FOR ALL
3. Job Set-up
Subtask 27-44-51-860-084-A
A. Aircraft Maintenance Configuration
   (1) Make sure that the aircraft electrical circuits are de-energized
(Ref. AMM TASK 24-41-00-862-002).
   (2) Make sure that the hydraulic systems are depressurized
(Ref. AMM TASK 29-00-00-864-001).
Subtask 27-44-51-941-068-A
B. Safety Precautions
   (1) In the cockpit:
     (a) On the pitch-trim control wheels, put the 98D27403500000 PITCH TRIM CONTROL LOCKING (Ref. AMM TASK 27-00-00-480-001).
     (b) Put the WARNING NOTICE(S) in position:
  • On the overhead panel, on the HYD section of panel 40VU, to tell persons not to pressurize the hydraulic systems
  • On the pitch-trim control wheels, to tell persons not to operate it.
   (2) On the ground:
     (a) Open access doors 197CB, 198CB and 197EB.
     (b) Put the WARNING NOTICE(S) in position:
  • On the ground service panel of the Yellow hydraulic system, to tell persons not to pressurize the Yellow hydraulic system
  • On the ground service panel of the Green hydraulic system, to tell persons not to pressurize the Green hydraulic system
  • On the ground service panel of the Blue hydraulic system, to tell persons not to pressurize the Blue hydraulic system.
Subtask 27-44-51-010-057-A
C. Get Access
   (1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position below access door 312AR.
   (2) Open access door 312AR.
   (3) Put the MAT - PROTECTIVE in the area of the Trimmable Horizontal Stabilizer (THS) actuator to prevent damage to the structure.
4. Procedure
Subtask 27-44-51-220-051-A ** ON A/C NOT FOR ALL
A. Inspection
   (1) Carefully examine the upper attachments (2),(3) and the lower attachments (6) of the THSA.
   (2) Clean:
  • the primary upper attachments (2),
  • the secondary upper attachments (3),
  • the primary lower attachments (6),
  • the secondary lower attachments at the nut assembly (8)
with Non Aqueous Cleaner-- Petroleum Based - (Material No.08BBB1) and let them dry.
   (3) Use a FLASHLIGHT and examine the primary upper attachments (2) for:
  • cracks,
  • dents,
  • corrosion,
  • protective finish,
  • correct attachment.
   (4) Use a FLASHLIGHT and examine the secondary upper attachments (3) for:
  • cracks,
  • dents,
  • corrosion,
  • protective finish,
  • correct attachment.
NOTE: There can be a light mark on the tie bar of the upper attachment secondary load path. This circular mark is a cosmetic mark only.
This mark is permitted and will not have negative effects on the function, performance or life time of the THSA. Refer to Goodrich SB for more data (Ref. SB 47145-27-10).
   (5) Use a FLASHLIGHT and examine the primary lower attachments (6) for:
  • cracks,
  • dents,
  • corrosion,
  • protective finish,
  • correct attachment.
   (6) Use a FLASHLIGHT and examine the secondary lower attachments at the nut assembly (8) for:
  • cracks,
  • corrosion,
  • protective finish,
  • correct attachment.
Subtask 27-44-51-220-051-B ** ON A/C NOT FOR ALL
A. Inspection
   (1) Carefully examine the upper attachments (2) and (3), and the lower attachments (6) of the THS actuator.
   (2) Clean the attachments that follow with Non Aqueous Cleaner-- Petroleum Based - (Material No.08BBB1) and let them dry:
  • The primary upper attachments (2)
  • The secondary upper attachments (3)
  • The primary lower attachments (6)
  • The secondary lower attachments at the nut assembly (8).
   (3) With the FLASHLIGHT, examine the primary upper attachments (2) for:
  • Cracks
  • Dents
  • Corrosion
  • Protective finish.
     (a) Make sure that the primary upper attachments (2) are correctly attached.
   (4) With the FLASHLIGHT, examine the secondary upper attachments (3) for:
  • Cracks
  • Dents
  • Corrosion
  • Protective finish.
NOTE: There can be a small circular mark on the tie bar of the upper-attachment secondary load-path.
This mark is permitted and will not have unwanted effects on the operation, performance or life time of the THS actuator. For more data, you can refer to the Goodrich Service Bulletin (SB) (Ref. SB 47145-27-10).
     (a) Make sure that the secondary upper attachments (3) are correctly attached.
     (b) On the Electrical Load Sensing Device (ELSD):
       1 Make sure that the two teeth on the two opposite sides of each locking washer are bent.
   (5) With the FLASHLIGHT, examine the primary lower attachments (6) for:
  • Cracks
  • Dents
  • Corrosion
  • Protective finish.
     (a) Make sure that the primary lower attachments (6) are correctly attached.
   (6) With the FLASHLIGHT, examine the secondary lower attachments at the nut assembly (8) for:
  • Cracks
  • Dents
  • Corrosion
  • Protective finish.
     (a) Make sure that the secondary lower attachments at the nut assembly (8) are correctly attached.
5. Close-up
Subtask 27-44-51-410-057-A
A. Close Access
   (1) Remove the MAT - PROTECTIVE.
   (2) Make sure that the work area is clean and clear of tools and other items.
   (3) Close access door 312AR.
   (4) Close access doors 197CB, 198CB and 197EB.
Subtask 27-44-51-942-067-A
B. Put the aircraft back to the serviceable condition.
   (1) In the cockpit: Remove the 98D27403500000 PITCH TRIM CONTROL LOCKING (Ref. AMM TASK 27-00-00-080-001).
   (2) Remove the WARNING NOTICE(S).
   (3) Remove the access platform(s).
   (4) Remove all the fixtures, tools, test and support equipment used during this procedure.
[Rev.10 from 2021] 2026.03.31 23:51:30 UTC
"Aviabrain" 2025