W DOC AIRBUS | AMM A320F

Removal of the Asymmetry-Position Pick-Off Unit

TASK 27-51-18-000-001-A
Removal of the Asymmetry-Position Pick-Off Unit

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 ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED BEFORE YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT. UNWANTED ELECTRICAL POWER CAN BE DANGEROUS.
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.
FIN: 29CV
FIN: 30CV
1. Reason for the Job
Self explanatory
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
AR
ACCESS PLATFORM 4M (13 FT)
No specific
AR
CAP - BLANKING
No specific
AR
SAFETY BARRIER(S)
No specific
AR
SAFETY CLIP - CIRCUIT BREAKER
No specific
AR
TIE WRAP
No specific
AR
WARNING NOTICE(S)
98D27504005000
1
PIN RIGGING-FLAPS (TRACK 1)
98D27504006000
1
PIN-RIGGING, FLAPS
98D27803500001
1
LOCKING TOOL ZERO POS
98D27803500002
1
LOCKING TOOL ZERO POS
 B. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
FOR [29CV] (POSITION PICK OFF UNIT)
575FB
FOR [30CV] (POSITION PICK OFF UNIT)
675FB
 C. Referenced Information
REFERENCE
DESIGNATION
TASK 27-50-00-866-009-A
Retraction of the Flaps on the Ground
TASK 27-50-00-866-009-A-01
Retraction of the Flaps/Slats on the Ground
F Flap APPU - Detail and Location
F Flap APPU - Zero Datum Settings and Locations
FOR [29CV] (POSITION PICK OFF UNIT)
TASK 57-51-37-000-004-A
Removal of the Access Panels 575AB(675AB), 575BB(675BB), 575CB(675CB), 575DB(675DB), 575EB(675EB), 575FB(675FB), 575GB(675GB), 575HB(675HB)
FOR [30CV] (POSITION PICK OFF UNIT)
TASK 57-51-37-000-004-A
Removal of the Access Panels 575AB(675AB), 575BB(675BB), 575CB(675CB), 575DB(675DB), 575EB(675EB), 575FB(675FB), 575GB(675GB), 575HB(675HB)
3. Job Set-up
Subtask 27-51-18-941-056-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 27-51-18-860-050-B ** ON A/C NOT FOR ALL
B. Aircraft Maintenance Configuration
   (1) If you replace the APPU, fully retract the flaps (Ref. AMM TASK 27-50-00-866-009).
NOTE: An APPU is self locking and can be removed/installed when the flap/slat system is not at zero if:
  • the same APPU is to be installed and its position is not changed
  • no movement of the flap/slat system is permitted during the time the APPU is removed.
   (2) Install the 98D27803500001 LOCKING TOOL ZERO POS or 98D27803500002 LOCKING TOOL ZERO POS on the flap/slat control-lever.
   (3) If a new APPU is to be installed, install the 98D27504005000 PIN RIGGING-FLAPS (TRACK 1) at the flap track 1 position only.
   (4) Remove the safety collar from the circuit breakers 10CV and 12CV.
Subtask 27-51-18-860-050-C ** ON A/C NOT FOR ALL
B. Aircraft Maintenance Configuration
   (1) If you replace the APPU, fully retract the flaps (Ref. AMM TASK 27-50-00-866-009).
NOTE: An APPU is self locking and can be removed/installed when the flap/slat system is not at zero if:
  • the same APPU is to be installed and its position is not changed
  • no movement of the flap/slat system is permitted during the time the APPU is removed.
   (2) Install the 98D27803500001 LOCKING TOOL ZERO POS or 98D27803500002 LOCKING TOOL ZERO POS on the flap/slat control-lever.
   (3) If a new APPU is to be installed, install the 98D27504006000 PIN-RIGGING, FLAPS at the flap track 1 position only.
   (4) Remove the safety collar from the circuit breakers 10CV and 12CV.
Subtask 27-51-18-865-050-A
C. Open, safety and tag this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUFLIGHT CONTROLS/FLP/CTL AND MONG/SYS16CVB07
** ON A/C NOT FOR ALL
49VUFLIGHT CONTROLS/FLP/CTL AND MONG/SYS16CVB02
** ON A/C ALL
121VUFLIGHT CONTROLS/WTB/FLP/SYS212CVP20
121VUFLIGHT CONTROLS/FLP/CTL AND/MONG/SYS28CVQ21
122VUFLIGHT CONTROLS/WTB/FLP/SYS110CVS07
Subtask 27-51-18-010-050-A
D. Get Access
   (1) Put the ACCESS PLATFORM 4M (13 FT) in position:
     (a) FOR [29CV] (POSITION PICK OFF UNIT)
below the access panel 575FB
     (b) FOR [30CV] (POSITION PICK OFF UNIT)
below the access panel 675FB.
   (2) Remove the applicable access panel:
     (a) FOR [29CV] (POSITION PICK OFF UNIT)
remove 575FB (Ref. AMM TASK 57-51-37-000-004)
     (b) FOR [30CV] (POSITION PICK OFF UNIT)
remove 675FB (Ref. AMM TASK 57-51-37-000-004).
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 27-51-18-020-050-A
A. Removal of the Asymmetry-Position Pick-Off Unit
CAUTION: MAKE MATCH MARKS ON ALL THE ELECTRICAL WIRES BEFORE YOU DISCONNECT THEM. INCORRECT CONNECTION OF WIRES WILL CAUSE DAMAGE TO EQUIPMENT.
   (1) Electrically disconnect the APPU as follows:
     (a) Disconnect the plug (4) from the connector A and the plug (5) from the connector B.
     (b) Install CAP - BLANKING on the plugs (4) and (5) and the connectors A and B.
   (2) Hold the APPU (3), remove the bolts (2) and the washers (1), then disengage and remove the APPU (3).
   (3) Install a TIE WRAP (6) behind the locking plate (7) to lock the APPU (3) in position.
[Rev.10 from 2021] 2026.04.01 06:56:37 UTC
"Aviabrain" 2025