W DOC AIRBUS | AMM A320F

Detailed Visual Inspection of the Slat Transmission System

TASK 27-84-00-200-001-A
Detailed Visual Inspection of the Slat Transmission System

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 GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.
ZONE: 147
ZONE: 190
ZONE: 520
ZONE: 620
1. Reason for the Job
Refer to the MPD TASK: 278400-01
DETAILED INSPECTION OF TRANSMISSION ASSY
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific
1
ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific
AR
FLASHLIGHT
No specific
AR
MIRROR - INSPECTION, FLEXIBLE
No specific
AR
SAFETY BARRIER(S)
No specific
AR
SAFETY CLIP - CIRCUIT BREAKER
No specific
AR
WARNING NOTICE(S)
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.08BAA9)
Non Aqueous Cleaner-General - -
(Material No.12ACC1)
Corrosion Preventive Compound-Heavy Duty Soft Film -
(Material No.14SBA1)
Textile-Lint free Cotton -
 C. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
147
MAIN GEAR WELL AND HYDRAULIC COMPARTMENT
190
BELLY FAIR, AIR CONDITIONING & HYD COMPT
520
LEFT WING FIXED LEADING EDGE
620
RIGHT WING FIXED LEADING EDGE
191BB, 191BT, 192BT, 192FB, 521BT, 522CB, 522FB, 522JB, 522KB, 522LB, 522NB, 522QB, 522SB, 522UB, 621BT, 622CB, 622FB, 622JB, 622KB, 622LB, 622NB, 622QB, 622SB, 622UB
522AB, 622AB
522YB, 622YB
 D. Referenced Information
REFERENCE
DESIGNATION
TASK 27-80-00-866-004-A
Extending the Slats on the Ground
TASK 27-80-00-866-005-A
Retracting the Slats on the Ground
TASK 29-00-00-864-001-A
Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 29-14-00-614-001-A
Depressurization of the Hydraulic Reservoirs
TASK 32-12-00-010-001-A
Open the Main Gear Doors for Access
TASK 32-12-00-410-001-A
Close the Main Gear Doors after Access
TASK 53-35-11-000-001-A
Removal of the Wing-to-Fuselage Fairings
TASK 53-35-11-400-001-A
Installation of the Wing-to-Fuselage Fairings
TASK 53-35-13-000-002-A
Removal of the Quick-Release Access Panels from the Belly Fairing Structure
TASK 53-35-13-400-002-A
Installation of the Quick-Release Access Panels on the Belly Fairing Structure
TASK 57-41-37-000-004-A
Removal of the Pressure Relief Panels
TASK 57-41-37-000-006-A
Removal of the Access Panels
TASK 57-41-37-000-009-A
Removal of the Access Panel
TASK 57-41-37-400-002-A
Installation of the Pressure Relief Panels
TASK 57-41-37-400-006-A
Installation of the Access Panels
TASK 57-41-37-400-009-A
Installation of the Access Panel
F Slat System - Component Location
F Steady Bearings and Torque Shafts - Component Location
3. Job Set-up
Subtask 27-84-00-941-051-A
A. Safety Precautions
   (1) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
   (2) Put a WARNING NOTICE(S) in the cockpit to tell persons not to operate the flight controls.
   (3) Put the WARNING NOTICE(S) in position to tell persons not to pressurize the hydraulic systems.
   (4) Put a WARNING NOTICE(S) in position to tell persons not to operate the MLG doors.
Subtask 27-84-00-860-056-A
B. Aircraft Maintenance Configuration
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.
   (1) Extend the slats fully (Ref. AMM TASK 27-80-00-866-004).
   (2) Make sure that the 98D27803000000 LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION is on the flap/slat control lever.
   (3) Depressurize the Green and Yellow hydraulic systems.
(Ref. AMM TASK 29-00-00-864-001).
   (4) Depressurize the applicable hydraulic reservoirs (Ref. AMM TASK 29-14-00-614-001).
Subtask 27-84-00-865-053-A
C. Open, safety and tag this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUFLIGHT CONTROLS/SLT/CTL AND MONG/SYS15CVB06
** ON A/C NOT FOR ALL
49VUFLIGHT CONTROLS/SLT/CTL AND MONG/SYS15CVB01
** ON A/C ALL
121VUFLIGHT CONTROLS/SLT/CTL/SYS27CVR21
Subtask 27-84-00-010-051-A ** ON A/C NOT FOR ALL
D. Get Access
   (1) Open the MLG doors (Ref. AMM TASK 32-12-00-010-001).
   (2) Make sure that the 460005835 SLEEVE - GROUND LOCK is installed on each MLG door actuating cylinder.
   (3) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE below the applicable wing.
   (4) Removal of the applicable access panels:
     (a) Remove the access panels of the left wing that follows:
     (b) Remove the access panels of the right wing that follows:
   (5) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in the applicable MLG bay.
Subtask 27-84-00-010-051-B ** ON A/C NOT FOR ALL
D. Get Access
   (1) Open the MLG doors (Ref. AMM TASK 32-12-00-010-001).
   (2) Make sure that the 460005835 SLEEVE - GROUND LOCK is installed on each MLG door actuating cylinder.
   (3) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE below the applicable wing.
   (4) Removal of the applicable access panels:
     (a) Remove the access panels of the left wing that follows:
     (b) Remove the access panels of the right wing that follows:
   (5) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in the applicable MLG bay.
4. Procedure
Subtask 27-84-00-110-050-A
A. Preparation for Inspection
   (1) Clean the component to be inspected with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
Subtask 27-84-00-210-050-A
B. Detailed Visual Inspection of the Slat Transmission System
   (1) Examine the Power Control Unit (PCU):
     (a) Make sure that the PCU is installed correctly.
     (b) Use a FLASHLIGHT and a MIRROR - INSPECTION, FLEXIBLE and examine the external surfaces of the PCU for:
  • cracks
  • corrosion
  • signs of leakage
  • satisfactory surface protection.
     (c) Make sure that the Line Replacement Units (LRU) are correctly installed. The LRUs are the:
  • two valve blocks
  • two inlet filters
  • six solenoid valves
  • two hydraulic motors
  • two Pressure-Off Brakes
  • Feedback Position Pick-off Unit
  • Instrumentation Position Pick-off Unit.
   (2) Examine the torque shaft assemblies:
     (a) Make sure that the torque shaft assemblies are correctly installed and that the retainer springs safety the pins correctly.
     (b) Use a FLASHLIGHT and MIRROR - INSPECTION, FLEXIBLE to examine the torque shafts and input joints for:
  • stress
  • distortion
  • dents
  • cracks
  • corrosion
  • satisfactory surface protection.
     (c) Make sure that the connections between the torque shafts and input joints are tight.
     (d) Do an inspection of the flange bolts for corrosion protection.
If the corrosion protection is unsatisfactory, apply a new layer of Corrosion Preventive Compound-Heavy Duty Soft Film - (Material No.12ACC1) .
   (3) Examine the steady bearing assemblies:
     (a) Make sure that the steady bearing assemblies are correctly installed.
     (b) Use a FLASHLIGHT and a MIRROR - INSPECTION, FLEXIBLE to examine the steady bearing assemblies for:
  • cracks
  • corrosion
  • satisfactory surface protection.
   (4) Examine the gearbox assemblies:
NOTE: The gearbox assemblies are units filled with grease and are not hermetically sealed units. It is normal for this grease to have some oil separation. The external surfaces of the gearbox assemblies may be moist with this separated oil as they are not sealed units. However, any separated oil in the unit that touches the grease will be changed back during operation. The oil separation will decrease during in-service operation until the lubricant is in a condition that is stable. This is normal and will not cause damage to the unit.
     (a) Make sure that the gearbox assemblies are correctly installed.
     (b) Use a FLASHLIGHT and a MIRROR - INSPECTION, FLEXIBLE to examine the outer sides of the gearbox assemblies for:
  • cracks
  • corrosion
  • signs of leakage
  • satisfactory surface protection.
   (5) Examine the actuator assemblies:
NOTE: The actuators are vented units filled with grease. It is normal for this grease to have some oil separation. The external surfaces of the actuator assemblies may be moist with this oil as they are not a hermetically sealed unit. However, any oil separation in the unit that touches the grease will be changed back during in-service operation and the lubricant is in a condition that is stable. This is normal and will not cause damage to the unit.
     (a) Make sure that each actuator is correctly installed.
     (b) Use a FLASHLIGHT and a MIRROR - INSPECTION, FLEXIBLE to examine the external surfaces of the actuators for:
  • cracks
  • corrosion
  • signs of leakage
  • satisfactory surface protection.
     (c) Make sure that the torque limiter indicator has not operated.
5. Close-up
Subtask 27-84-00-410-050-A ** ON A/C NOT FOR ALL
A. Close Access
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Closure of the applicable access panels:
     (a) Close the access panels of the left wing that follows:
     (b) Close the access panels of the right wing that follows:
   (3) Remove the access platform(s).
   (4) Close the MLG doors (Ref. AMM TASK 32-12-00-410-001).
Subtask 27-84-00-410-050-B ** ON A/C NOT FOR ALL
A. Close Access
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Closure of the applicable access panels:
     (a) Close the access panels of the left wing that follows:
     (b) Close the access panels of the right wing that follows:
   (3) Remove the access platform(s).
   (4) Close the MLG doors (Ref. AMM TASK 32-12-00-410-001).
Subtask 27-84-00-865-054-A
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUFLIGHT CONTROLS/SLT/CTL AND MONG/SYS15CVB06
** ON A/C NOT FOR ALL
49VUFLIGHT CONTROLS/SLT/CTL AND MONG/SYS15CVB01
** ON A/C ALL
121VUFLIGHT CONTROLS/SLT/CTL/SYS27CVR21
Subtask 27-84-00-866-051-A
C. Retract the Slats
   (1) Remove the 98D27803000000 LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION from the slat/flap control lever.
   (2) Retract the slats fully (Ref. AMM TASK 27-80-00-866-005).
Subtask 27-84-00-942-053-A
D. Removal of Equipment
   (1) Remove the WARNING NOTICE(S).
   (2) Remove the safety barriers.
   (3) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
[Rev.10 from 2021] 2026.03.31 23:56:36 UTC
"Aviabrain" 2025