W DOC AIRBUS | AMM A320F

Manual Adjustment of the Position Pick-Off Units

TASK 27-51-00-820-001-A
Manual Adjustment of the Position Pick-Off Units

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.
1. Reason for the Job
To set the mechanical zero position of the Position Pick-off Units.
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
LABEL - ADHESIVE, INOP
No specific
AR
SAFETY BARRIER(S)
No specific
1
TIE WRAP(S)
No specific
AR
WARNING NOTICE(S)
 B. Referenced Information
REFERENCE
DESIGNATION
TASK 27-51-18-000-001-A
Removal of the Asymmetry-Position Pick-Off Unit
TASK 27-51-18-400-001-A
Installation of the Asymmetry-Position Pick-Off Unit
TASK 27-51-19-000-001-A
Removal of the Feed Back Position Pick-Off Unit
TASK 27-51-19-400-001-A
Installation of the Feed Back Position Pick-Off Unit
TASK 27-55-11-000-001-A
Removal of the Instrumentation Position Pick-Off Unit
TASK 27-55-11-400-001-A
Installation of the Instrumentation Position Pick-Off Unit
TASK 27-81-18-000-001-A
Removal of the Asymmetry-Position Pick-Off Unit
TASK 27-81-18-400-001-A
Installation of the Asymmetry-Position Pick-Off Unit
TASK 27-81-19-000-001-A
Removal of the Feed Back Position Pick-Off Unit
TASK 27-81-19-400-001-A
Installation of the Feed Back Position Pick-Off Unit
TASK 27-85-11-000-001-A
Removal of the Instrumentation Position Pick-Off Unit
TASK 27-85-11-400-001-A
Installation of the Instrumentation Position Pick-Off Unit
F Position Pick-off Unit
3. Job Set-up
Subtask 27-51-00-941-072-A
A. Safety Precautions
   (1) Put the SAFETY BARRIER(S) in position.
   (2) Put a WARNING NOTICE(S) in position to tell persons not to operate the flight controls.
Subtask 27-51-00-010-060-A
B. Get Access
   (1) Remove the applicable Position Pick-off Unit (PPU):
4. Procedure
CAUTION: BE CAREFUL WHEN YOU DO MAINTENANCE TASKS ON THE WING TRAILING EDGE:
  • DO NOT CAUSE DAMAGE TO THE ELECTRICAL CABLE RACEWAYS.
  • DO NOT CAUSE DAMAGE TO THE ELECTRICAL CABLE INSTALLATIONS.
  • MAKE SURE THAT THE ELECTRICAL CABLES ARE INSTALLED CORRECTLY. INCORRECT INSTALLATION CAN CAUSE DAMAGE.
Subtask 27-51-00-820-050-A
A. Manual Adjustment of the Position Pick-Off Units
   (1) Unlock the locking plate of the drive shaft of the PPU.
   (2) Make sure that the drive shaft turns freely.
   (3) Turn the input shaft and align the drive gear zero mark and the orange zero indicator with the fixed pointers.
   (4) Make sure that the input shaft zero mark and the fixed zero mark are aligned.
NOTE: The mechanical zero position and the electrical zero position are the same.
   (5) If the PPU is not to be immediately installed:
     (a) Install a TIE WRAP(S) behind the locking plate.
     (b) Attach a LABEL - ADHESIVE, INOP to the PPU to tell persons that the PPU is locked in the zero position.
5. Close-up
Subtask 27-51-00-410-058-A
A. Close Access
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Install the applicable Position Pick-off Unit (PPU):
Subtask 27-51-00-942-076-A
B. Removal of Equipment
   (1) Remove the safety barriers.
   (2) Remove the WARNING NOTICE(S).
   (3) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
[Rev.10 from 2021] 2026.04.01 06:58:21 UTC
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