W DOC AIRBUS | AMM A320F

Adjustment of the MLG Extension Proximity Sensors

TASK 32-31-73-820-002-A
Adjustment of the MLG Extension Proximity Sensors

WARNING: MAKE SURE THAT THE SAFETY DEVICES AND THE WARNING NOTICES ARE IN POSITION BEFORE YOU START A TASK ON OR NEAR:
  • THE FLIGHT CONTROLS
  • THE FLIGHT CONTROL SURFACES
  • THE LANDING GEAR AND RELATED DOORS
  • COMPONENTS THAT MOVE.
MOVEMENT OF COMPONENTS CAN KILL OR 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.
ZONE: 734
ZONE: 744
FIN: 20GA
FIN: 21GA
FIN: 22GA
FIN: 23GA
1. Reason for the Job
To set the clearances of the MLG extension proximity sensors to the correct dimensions.
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
ACCESS PLATFORM 2M (6 FT)
No specific
AR
CAP - BLANKING
No specific
AR
SAFETY BARRIER(S)
No specific
AR
SAFETY CLIP - CIRCUIT BREAKER
No specific
AR
SCREW-JACK (0.190-28 IN)
No specific
AR
SUPPLY - 28 VDC, ELECTRICAL
No specific
AR
WARNING NOTICE(S)
No specific
Torque wrench: range to between .45 and .39 m.daN (39.82 and 34.51 lbf.in ) T
460005842
1
LAMP BOX
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.06AAB1)
Polysulfide Sealant-General Purpose Fillet -
(Material No.06AAC5)
Polysulfide Sealant-General Purpose Interfay Landing Gear
(Material No.06LDG6)
Non Hardening Jointing Putty-High Temp. Area - Hydraulic
 C. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
734
MAIN DOOR
744
MAIN DOOR
 D. Expendable Parts
FIG.ITEM
DESIGNATION
IPC-CSN
1
SPACER
AIPC 32-11-11-22-055
11
SPACER
AIPC 32-11-11-22-095
1
SPACER
AIPC 32-11-11-24-055
11
SPACER
AIPC 32-11-11-24-095
1
SPACER
AIPC 32-11-11-26-055
11
SPACER
AIPC 32-11-11-26-095
16
SPACER
AIPC 32-11-11-53-050
5
SPACER
AIPC 32-11-11-83-150
1
SPACER
AIPC 32-11-85-20-055
11
SPACER
AIPC 32-11-85-20-095
16
SPACER
AIPC 32-11-85-53-050
5
SPACER
AIPC 32-11-85-83-150
 E. Referenced Information
REFERENCE
DESIGNATION
TASK 07-11-00-581-001-A
Lifting for Aircraft Maintenance Operations
TASK 07-11-00-586-002-A
Lowering of the Aircraft for Maintenance Operations
TASK 12-14-32-614-003-A
Functional Check of MLG Shock Absorber Charge Pressure
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 29-10-00-864-001-A
Depressurize the Green Hydraulic System
TASK 32-00-00-481-001-A
Installation of the Safety Devices on the Landing Gears
TASK 32-00-00-860-001-A
Flight Configuration Precautions with Electrical Power
TASK 32-00-00-860-001-A-01
Flight Configuration Precautions without Electrical Power
TASK 32-00-00-860-002-A
Ground Configuration after Flight Configuration with Electrical Power
TASK 32-00-00-860-002-A-01
Ground Configuration after Flight Configuration without Electrical Power
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 32-69-00-740-001-A
BITE Check of Landing-Gear Control Interface-Unit (LGCIU) With Use of MCDU to Ensure that Continuous BITE is Operative
F MLG Extension Proximity Sensor Dimensions 20GA, 21GA, 22GA, 23GA
F MLG Extension Proximity Sensors 20GA, 21GA, 22GA, 23GA
3. Job Set-up
Subtask 32-31-73-941-059-A
A. Safety Precautions
   (1) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
   (2) Make sure that the ground safety locks are installed on the landing gear (Ref. AMM TASK 32-00-00-481-001).
   (3) On panel 400VU:
  • Make sure that the landing-gear control-lever 6GA is in the DOWN position
  • Put a WARNING NOTICE(S) in position to tell persons not to operate the landing gear and the MLG doors.
   (4) Put the WARNING NOTICE(S) in position to tell persons not to pressurize the Green Hydraulic system:
  • On panel 40VU in the cockpit
  • On the ground service panel of the Green Hydraulic system, access door (197CB).
Subtask 32-31-73-860-059-A
B. Aircraft Maintenance Configuration
   (1) Make sure that the Green hydraulic system is depressurized
(Ref. AMM TASK 29-10-00-864-001).
   (2) If the electrical power is not necessary for other maintenance tasks, de-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002). Then, it is not necessary to open the LGCIU circuit breakers.
   (3) If the electrical power is necessary, do the precautions for flight configuration (Ref. AMM TASK 32-00-00-860-001) before you open the LGCIU circuit breakers.
Subtask 32-31-73-582-057-A
C. Lift the Aircraft
   (1) Lift the aircraft on jacks (Ref. AMM TASK 07-11-00-581-001).
Subtask 32-31-73-010-056-A
D. Get Access
   (1) Put the ACCESS PLATFORM 2M (6 FT) in position below the applicable zone 734(744).
   (2) Open the applicable MLG door (Ref. AMM TASK 32-12-00-010-001).
   (3) Make sure that the 460005835 SLEEVE - GROUND LOCK is installed on the applicable MLG door actuator.
Subtask 32-31-73-865-071-A
E. Open, safety and tag this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
49VUL/G/LGCIU/SYS1/NORM1GAC09
** ON A/C NOT FOR ALL
121VULGCIU/BAT SPLY/SYS259GAR33
121VULGCIU/BAT SPLY/SYS158GAR32
** ON A/C ALL
121VUHYDRAULIC/LGCIU/SYS22GAQ35
121VUHYDRAULIC/LGCIU/SYS1/GRND SPLY52GAQ34
** ON A/C NOT FOR ALL
121VULGCIU/BAT SPLY/SYS259GAR32
121VULGCIU/BAT SPLY/SYS158GAR31
4. Procedure
Subtask 32-31-73-220-081-A
A. Dimensional Check
   (1) Measure the dimensions that follow for the rear proximity sensors 20GA(21GA) (System 1):
  • Dimension X 3.9 mm (0.1535 in.) to 4.1 mm (0.1614 in.)
  • Dimension Z 1.4 mm (0.0551 in.) to 1.6 mm (0.0630 in.).
   (2) Measure the dimensions that follow for the forward proximity sensors 22GA(23GA) (System 2):
  • Dimension X 3.9 mm (0.1535 in.) to 4.1 mm (0.1614 in.)
  • Dimension Z 1.4 mm (0.0551 in.) to 1.6 mm (0.0630 in.).
   (3) If the dimensions are correct, do the check of the proximity switch detection range in Para. 4.B.
   (4) If the dimensions are incorrect, do the adjustment procedure in Para. 4.C.
Subtask 32-31-73-220-082-B
B. Check of the Proximity Sensor Detection Range
F MLG Extension Proximity Sensors 20GA, 21GA, 22GA, 23GA
   (1) Make sure that the applicable MLG is correctly filled and charged (Ref. AMM TASK 12-14-32-614-003).
   (2) Measure the dimension A. Make sure the dimension A is between 632.80 mm (24.9134 in.) and 636.95 mm (25.0768 in.).
   (3) Disconnect the electrical connector from the applicable rear and forward proximity sensors 20GA(21GA) (System 1), 22GA(23GA) (System 2).
   (4) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
   (5) Connect the 460005842 LAMP BOX to the electrical connector of the applicable proximity sensors 20GA(21GA) (System 1), 22GA(23GA) (system 2).
   (6) Make sure that the switches on the lamp box are set to OFF.
   (7) Connect a SUPPLY - 28 VDC, ELECTRICAL to the lamp box and set the power switch to ON.
   (8) Make sure that the RED lamp on the lamp box is ON.
   (9) Set the indicator switches on the lamp box to ON and make sure that the GREEN lamps on the lamp box are ON.
   (10) Put a SCREW-JACK (0.190-28 IN) under the jacking dome of the applicable shock absorber.
   (11) Slowly operate the jack to ensure that the jack-plunger locates safely.
   (12) Use the jack to slowly compress the applicable MLG shock absorber.
   (13) When the MLG shock absorber is compressed by 26.0 mm (1.0236 in.):
     (a) The applicable forward proximity sensor 22GA(23GA) must operate.
     (b) The applicable GREEN lamp on the lamp box must go OFF.
   (14) When the MLG shock absorber is compressed by 29.3 mm (1.1535 in.):
     (a) The applicable rear proximity sensor 20GA(21GA) must operate.
     (b) The applicable GREEN lamp on the lamp box must go OFF.
   (15) Slowly release the pressure from the jack to fully extend the shock absorber.
   (16) Do the steps (12) thru (15) one more time.
   (17) Remove the jack.
   (18) Set the lamp box switches to OFF, and disconnect the 28V D.C. supply.
   (19) Remove the 460005842 LAMP BOX from the applicable proximity sensor.
   (20) Remove the CAP - BLANKING and connect the electrical connector to the applicable forward and rear proximity sensors.
Subtask 32-31-73-820-051-B ** ON A/C NOT FOR ALL
C. Adjustment of the MLG Extension Proximity Sensors 20GA (21GA) (System 1) and 22GA (23GA) (System 2)
F MLG Extension Proximity Sensor Dimensions 20GA, 21GA, 22GA, 23GA ** ON A/C NOT FOR ALL
F MLG Extension Proximity Sensors 20GA, 21GA, 22GA, 23GA ** ON A/C NOT FOR ALL
NOTE: It is permitted to install a sensor target without a spacer if the correct clearance can be set without the spacer.
   (1) Make sure that the aircraft is lifted on jacks to fully extend the shock absorber (Ref. AMM TASK 07-11-00-581-001).
   (2) Make sure that the applicable MLG shock absorber is correctly filled and charged (Ref. AMM TASK 12-14-32-614-003).
   (3) For the rear proximity sensor 20GA (21GA):
  • If dimension X is incorrect, do the steps that follow:
NOTE: Dimension X must be between 3.9 mm (0.1535 in.) and 4.1 mm (0.1614 in.).
     (a) Measure dimensions F, G and H.
     (b) Use the formula to calculate dimension X.
     (c) Remove the nuts (18), the washers (17) and the screws (14).
     (d) Remove the target (15).
     (e) Remove and discard the spacer (16) if installed.
     (f) Make sure that the target mounting bracket is in the correct condition.
     (g) If necessary, adjust the new AIPC 32-11-11-53-050 SPACER (16) to get the correct dimension X.
NOTE: It is possible that two spacers are necessary.
     (h) Install the new spacer(s) (16) if necessary, and the target (15) together with:
  • The screws (14)
  • The washers (17)
  • The nuts (18).
     (i) TORQUE the nuts (18) to between .45 and .39 m.daN (39.82 and 34.51 lbf.in ) T.
     (j) Apply Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) to the areas that follow:
  • Around the joints between the target (15), the spacer (16) if installed, and the target mounting bracket
  • The heads and the ends of the screws (14)
  • The washers (17)
  • The nuts (18).
   (4) For the rear proximity sensor 20GA (21GA):
  • If dimension Z is incorrect, do the steps that follow:
NOTE: Dimension Z must be between 1.4 mm (0.0551 in.) and 1.6 mm (0.0630 in.).
     (a) Disconnect the electrical connector from the applicable proximity sensor 20GA (21GA).
     (b) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
     (c) Remove the nuts (13), the washers (12) and the screws (10).
     (d) Remove the applicable proximity sensor 20GA (21GA).
     (e) Remove and discard the spacer (11) if installed.
     (f) Make sure that the sensor mounting bracket is in the correct condition.
     (g) If necessary, adjust the new AIPC 32-11-11-22-095 SPACER (11) to get the correct dimension Z.
NOTE: It is possible that two spacers are necessary.
     (h) Put the applicable proximity sensor 20GA (21GA) and the new spacer(s) (11) if necessary, in position on the sensor mounting bracket.
     (i) Install the screws (10), the washers (12) and the nuts (13).
     (j) TORQUE the nuts (13) to between .45 and .39 m.daN (39.82 and 34.51 lbf.in ) T.
     (k) Apply Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) to the areas that follow:
  • Around the joints between the applicable proximity sensor 20GA (21GA), the spacer (11) if installed, and the sensor mounting bracket
  • The heads and the ends of the screws (10)
  • The washers (12)
  • The nuts (13).
     (l) Remove the CAP-BLANKING from each electrical connector and receptacle.
     (m) Connect the electrical connector to the applicable proximity sensor 20GA (21GA).
   (5) For the forward proximity sensor 22GA (23GA):
  • If dimension X is incorrect, do the steps that follow:
NOTE: Dimension X must be between 3.9 mm (0.1535 in.) and 4.1 mm (0.1614 in.).
     (a) Measure dimensions J, K and L.
     (b) Use the formula to calculate dimension X.
     (c) Remove the nuts (7), the washers (6) and the screws (4).
     (d) Remove the target (3).
     (e) Remove and discard the spacer (5) if installed.
     (f) Make sure that the target mounting bracket is in the correct condition.
     (g) If necessary, adjust the new AIPC 32-11-11-83-150 SPACER (5) to get the correct dimension X.
NOTE: It is possible that two spacers are necessary.
     (h) Install the new spacer (5) if necessary, and the target (3) together with:
  • The screws (4)
  • The washers (6)
  • The nuts (7).
     (i) TORQUE the nuts (7) to between .45 and .39 m.daN (39.82 and 34.51 lbf.in ) T.
     (j) Apply Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) to the areas that follow:
  • Around the joints between the target (3), the spacer (5) if installed, and the target mounting bracket
  • The heads and the ends of the screws (4)
  • The washers (6)
  • The nuts (7).
   (6) For the forward proximity sensor 22GA (23GA):
  • If dimension Z is incorrect, do the steps that follow:
NOTE: Dimension Z must be between 1.4 mm (0.0551 in.) and 1.6 mm (0.0630 in.).
     (a) Disconnect the electrical connector from the applicable proximity sensor 22GA (23GA).
     (b) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
     (c) Remove the nuts (8), the washers (9) and the screws (2).
     (d) Remove the applicable proximity sensor 22GA (23GA).
     (e) Remove and discard the spacer (1) if installed.
     (f) Make sure that the sensor mounting bracket is in the correct condition.
     (g) If necessary, adjust the new AIPC 32-11-11-22-055 SPACER (1) to get the correct dimension Z.
NOTE: It is possible that two spacers are necessary.
     (h) Put the applicable proximity sensor 22GA (23GA) and the new spacer (1) if necessary, in position on the sensor mounting bracket.
     (i) Install the screws (2), the washers (9) and the nuts (8).
     (j) TORQUE the nuts (8) to between .45 and .39 m.daN (39.82 and 34.51 lbf.in ) T.
     (k) Apply Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) to the areas that follow:
  • Around the joints between the applicable proximity sensor 22GA (23GA), the spacer (1) if installed, and the sensor mounting bracket
  • The heads and the ends of the screws (2)
  • The washers (9)
  • The nuts (8).
     (l) Remove the CAP-BLANKING from each electrical connector and receptacle.
     (m) Connect the electrical connector to the applicable proximity sensor 22GA (23GA).
   (7) Do a check of the proximity-sensor detection range given in Para. 4.B.
Subtask 32-31-73-820-051-F ** ON A/C NOT FOR ALL
C. Adjustment of the MLG Extension Proximity Sensors 20GA(21GA) (System 1) and 22GA(23GA) (System 2)
F MLG Extension Proximity Sensor Dimensions 20GA, 21GA, 22GA, 23GA ** ON A/C NOT FOR ALL
F MLG Extension Proximity Sensors 20GA, 21GA, 22GA, 23GA ** ON A/C NOT FOR ALL
NOTE: It is permitted to install a sensor target without a spacer if the correct clearance can be set without the spacer.
   (1) Make sure that the aircraft is lifted on jacks to fully extend the shock absorber (Ref. AMM TASK 07-11-00-581-001).
   (2) Make sure that the applicable MLG shock absorber is correctly filled and charged (Ref. AMM TASK 12-14-32-614-003).
   (3) For the rear proximity sensor 20GA(21GA):
  • If the dimension X is incorrect, do the steps that follow:
NOTE: Dimension X must be between 3.9 mm (0.1535 in.) and 4.1 mm (0.1614 in.).
     (a) Measure the dimensions F, G and H.
     (b) Use the formula to calculate the dimension X.
     (c) Remove the nuts (18), the washers (17) and the screws (14).
     (d) Remove the target (15).
     (e) Remove and discard the spacer (16) if installed.
     (f) Make sure that the target mounting bracket is in the correct condition.
     (g) If necessary, adjust the new AIPC 32-11-11-53-050 SPACER (16) or AIPC 32-11-85-53-050 SPACER (16) to get the correct dimension X.
NOTE: It is possible that two spacers are necessary.
     (h) Install the spacer (16) if necessary, and the target (15) together with:
  • The screws (14)
  • The washers (17)
  • The nuts (18).
     (i) TORQUE the nuts (18) to between 0.45 and 0.39 m.daN (39.82 and 34.51 lbf.in ) T.
     (j) Apply Polysulfide Sealant-General Purpose Interfay Landing Gear (Material No.06AAC5) to the areas that follow:
  • Around the joints between the target (15), the spacer (16) if installed, and the target mounting bracket
  • To the heads and the ends of the screws (14)
  • To the washers (17)
  • To the nuts (18).
   (4) For the rear proximity sensor 20GA(21GA):
  • If the dimension Z is incorrect, do the steps that follow:
NOTE: Dimension Z must be between 1.4 mm (0.0551 in.) and 1.6 mm (0.0630 in.).
     (a) Disconnect the electrical connector from the applicable proximity sensor 20GA(21GA).
     (b) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
     (c) Remove the nuts (13), the washers (12) and the screws (10).
     (d) Remove the applicable proximity sensor 20GA(21GA).
     (e) Remove and discard the spacer (11) if installed.
     (f) Make sure that the sensor mounting bracket is in the correct condition.
     (g) If necessary, adjust the new AIPC 32-11-11-22-095 SPACER (11) or AIPC 32-11-85-20-095 SPACER (11) to get the correct dimension Z.
NOTE: It is possible that two spacers are necessary.
     (h) Put the applicable proximity sensor 20GA(21GA) and the new spacer(s) (11) if necessary, in position on the sensor mounting bracket.
     (i) Install the screws (10), the washers (12) and the nuts (13).
     (j) TORQUE the nuts (13) to between 0.45 and 0.39 m.daN (39.82 and 34.51 lbf.in ) T.
     (k) Apply Polysulfide Sealant-General Purpose Interfay Landing Gear (Material No.06AAC5) to the areas that follow:
  • Around the joints between the applicable proximity sensor 20GA(21GA), the spacer (11) if installed, and the sensor mounting bracket
  • To the heads and the ends of the screws (10)
  • To the washers (12)
  • To the nuts (13).
     (l) Remove the CAP - BLANKING and connect the electrical connector to the applicable proximity sensor 20GA(21GA).
   (5) For the forward proximity sensor 22GA(23GA):
  • If the dimension X is incorrect, do the steps that follow:
NOTE: Dimension X must be between 3.9 mm (0.1535 in.) and 4.1 mm (0.1614 in.).
     (a) Measure the dimensions J, K and L.
     (b) Use the formula to calculate the dimension X.
     (c) Remove the nuts (7), the washers (6) and the screws (4).
     (d) Remove the target (3).
     (e) Remove and discard the spacer (5) if installed.
     (f) Apply Non Hardening Jointing Putty-High Temp. Area - Hydraulic (Material No.06LDG6) to the mating surface of the spacer (5) and the upper torque link assembly.
     (g) Install the new AIPC 32-11-11-83-150 SPACER (5) or AIPC 32-11-85-83-150 SPACER (5) if necessary, and the target (3) together with:
  • The screws (4)
  • The washers (6)
  • The nuts (7).
     (h) Make sure that the target mounting bracket is in the correct condition.
     (i) If necessary, adjust the new spacer (5) to get the correct dimension X.
NOTE: It is possible that two spacers are necessary.
     (j) TORQUE the nuts (7) to between 0.45 and 0.39 m.daN (39.82 and 34.51 lbf.in ) T.
     (k) Apply Polysulfide Sealant-General Purpose Interfay Landing Gear (Material No.06AAC5) to the areas that follow:
  • Around the joints between the target (3), the spacer (5) if installed, and the target mounting bracket
  • To the heads and the ends of the screws (4)
  • To the washers (6)
  • To the nuts (7).
   (6) For the forward proximity sensor 22GA(23GA):
  • If the dimension Z is incorrect, do the steps that follow:
NOTE: Dimension Z must be between 1.4 mm (0.0551 in.) and 1.6 mm (0.0630 in.).
     (a) Disconnect the electrical connector from the applicable proximity sensor 22GA(23GA).
     (b) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
     (c) Remove the nuts (8), the washers (9) and the screws (2).
     (d) Remove the applicable proximity sensor 22GA(23GA).
     (e) Remove and discard the spacer (1) if installed.
     (f) Make sure that the sensor mounting bracket is in the correct condition.
     (g) Put the applicable proximity sensor 22GA(23GA) and the new AIPC 32-11-11-22-055 SPACER (1) or AIPC 32-11-85-20-055 SPACER (1) if necessary, in position on the sensor mounting bracket.
     (h) If necessary, adjust the new spacer (1) to get the correct dimension Z.
NOTE: It is possible that two spacers are necessary.
     (i) Install the screws (2), the washers (9) and the nuts (8).
     (j) TORQUE the nuts (8) to between 0.45 and 0.39 m.daN (39.82 and 34.51 lbf.in ) T.
     (k) Apply Polysulfide Sealant-General Purpose Interfay Landing Gear (Material No.06AAC5) to the areas that follow:
  • Around the joints between the applicable proximity sensor 22GA(23GA), the spacer (1) if installed, and the sensor mounting bracket
  • To the heads and the ends of the screws (2)
  • To the washers (9)
  • To the nuts (8).
     (l) Remove the CAP - BLANKING and connect the electrical connector to the applicable proximity sensor 22GA(23GA).
   (7) Do a check of the Proximity Sensor Detection Range Para. 4.B.
Subtask 32-31-73-820-051-G ** ON A/C NOT FOR ALL
C. Adjustment of the MLG Extension Proximity Sensors 20GA (21GA) (System 1) and 22GA (23GA) (System 2)
F MLG Extension Proximity Sensor Dimensions 20GA, 21GA, 22GA, 23GA ** ON A/C NOT FOR ALL
F MLG Extension Proximity Sensors 20GA, 21GA, 22GA, 23GA ** ON A/C NOT FOR ALL
NOTE: It is permitted to install a sensor target without a spacer if the correct clearance can be set without the spacer.
   (1) Make sure that the aircraft is lifted on jacks to fully extend the shock absorber (Ref. AMM TASK 07-11-00-581-001).
   (2) Make sure that the applicable MLG shock absorber is correctly filled and charged (Ref. AMM TASK 12-14-32-614-003).
   (3) For the rear proximity sensor 20GA (21GA):
  • If the dimension X is incorrect, do the steps that follow:
NOTE: Dimension X must be between 3.9 mm (0.1535 in.) and 4.1 mm (0.1614 in.).
     (a) Measure the dimensions F, G and H.
     (b) Use the formula to calculate the dimension X.
     (c) Remove the nuts (18), the washers (17) and the screws (14).
     (d) Remove the target (15).
     (e) Remove and discard the spacer (16) if installed.
     (f) Make sure that the target mounting bracket is in the correct condition.
     (g) If necessary, adjust the new AIPC 32-11-11-53-050 SPACER (16) or AIPC 32-11-85-53-050 SPACER (16) to get the correct dimension X.
NOTE: It is possible that two spacers are necessary.
     (h) Install the spacer (16) if necessary, and the target (15) together with:
  • The screws (14)
  • The washers (17)
  • The nuts (18).
     (i) TORQUE the nuts (18) to between 0.45 and 0.39 m.daN (39.82 and 34.51 lbf.in ) T.
     (j) Apply Polysulfide Sealant-General Purpose Interfay Landing Gear (Material No.06AAC5) to the areas that follow:
  • Around the joints between the target (15), the spacer (16) if installed, and the target mounting bracket
  • To the heads and the ends of the screws (14)
  • To the washers (17)
  • To the nuts (18).
   (4) For the rear proximity sensor 20GA (21GA):
  • If the dimension Z is incorrect, do the steps that follow:
NOTE: Dimension Z must be between 1.4 mm (0.0551 in.) and 1.6 mm (0.0630 in.).
     (a) Disconnect the electrical connector from the applicable proximity sensor 20GA(21GA).
     (b) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
     (c) Remove the nuts (13), the washers (12) and the screws (10).
     (d) Remove the applicable proximity sensor 20GA (21GA).
     (e) Remove and discard the spacer (11) if installed.
     (f) Make sure that the sensor mounting bracket is in the correct condition.
     (g) If necessary, adjust the new AIPC 32-11-85-20-095 SPACER (11) or the new AIPC 32-11-11-26-095 SPACER (11) to get the correct dimension Z.
NOTE: It is possible that two spacers are necessary.
     (h) Put the applicable proximity sensor 20GA (21GA) and the new spacer(s) (11) if necessary, in position on the sensor mounting bracket.
     (i) Install the screws (10), the washers (12) and the nuts (13).
     (j) TORQUE the nuts (13) to between 0.45 and 0.39 m.daN (39.82 and 34.51 lbf.in ) T.
     (k) Apply Polysulfide Sealant-General Purpose Interfay Landing Gear (Material No.06AAC5) to the areas that follow:
  • Around the joints between the applicable proximity sensor 20GA (21GA), the spacer (11) if installed, and the sensor mounting bracket
  • To the heads and the ends of the screws (10)
  • To the washers (12)
  • To the nuts (13).
     (l) Remove the CAP-BLANKING from each electrical connector and receptacle.
     (m) Connect the electrical connector to the applicable proximity sensor 20GA (21GA).
   (5) For the forward proximity sensor 22GA (23GA):
  • If the dimension X is incorrect, do the steps that follow:
  • If the dimension X is incorrect, do the steps that follow:
NOTE: Dimension X must be between 3.9 mm (0.1535 in.) and 4.1 mm (0.1614 in.).
     (a) Measure the dimensions J, K and L.
     (b) Use the formula to calculate the dimension X.
     (c) Remove the nuts (7), the washers (6) and the screws (4).
     (d) Remove the target (3).
     (e) Remove and discard the spacer (5) if installed.
     (f) Apply Non Hardening Jointing Putty-High Temp. Area - Hydraulic (Material No.06LDG6) to the mating surface of the spacer (5) and the upper torque link assembly.
     (g) Install the new AIPC 32-11-11-83-150 SPACER (5) or AIPC 32-11-85-83-150 SPACER (5) if necessary, and the target (3) together with:
  • The screws (4)
  • The washers (6)
  • The nuts (7).
     (h) Make sure that the target mounting bracket is in the correct condition.
     (i) If necessary, adjust the new spacer (5) to get the correct dimension X.
NOTE: It is possible that two spacers are necessary.
     (j) TORQUE the nuts (7) to between 0.45 and 0.39 m.daN (39.82 and 34.51 lbf.in ) T.
     (k) Apply Polysulfide Sealant-General Purpose Interfay Landing Gear (Material No.06AAC5) to the areas that follow:
  • Around the joints between the target (3), the spacer (5) if installed, and the target mounting bracket
  • To the heads and the ends of the screws (4)
  • To the washers (6)
  • To the nuts (7).
   (6) For the forward proximity sensor 22GA (23GA):
  • If the dimension Z is incorrect, do the steps that follow:
NOTE: Dimension Z must be between 1.4 mm (0.0551 in.) and 1.6 mm (0.0630 in.).
     (a) Disconnect the electrical connector from the applicable proximity sensor 22GA (23GA).
     (b) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
     (c) Remove the nuts (8), the washers (9) and the screws (2).
     (d) Remove the applicable proximity sensor 22GA (23GA).
     (e) Remove and discard the spacer (1) if installed.
     (f) Make sure that the sensor mounting bracket is in the correct condition.
     (g) Put the applicable proximity sensor 22GA (23GA) and the new AIPC 32-11-85-20-055 SPACER (1) or the new AIPC 32-11-11-26-055 SPACER (1) if necessary, in position on the sensor mounting bracket.
     (h) If necessary, adjust the new spacer (1) to get the correct dimension Z.
NOTE: It is possible that two spacers are necessary.
     (i) Install the screws (2), the washers (9) and the nuts (8).
     (j) TORQUE the nuts (8) to between 0.45 and 0.39 m.daN (39.82 and 34.51 lbf.in ) T.
     (k) Apply Polysulfide Sealant-General Purpose Interfay Landing Gear (Material No.06AAC5) to the areas that follow:
  • Around the joints between the applicable proximity sensor 22GA (23GA), the spacer (1) if installed, and the sensor mounting bracket
  • To the heads and the ends of the screws (2)
  • To the washers (9)
  • To the nuts (8).
     (l) Remove the CAP-BLANKING from each electrical connector and receptacle.
     (m) Connect the electrical connector to the applicable proximity sensor 22GA (23GA).
   (7) Do a check of the Proximity Sensor Detection Range Para. 4.B.
Subtask 32-31-73-820-051-J ** ON A/C NOT FOR ALL
C. Adjustment of the MLG Extension Proximity Sensors 20GA (21GA) (System 1) and 22GA (23GA) (System 2)
F MLG Extension Proximity Sensor Dimensions 20GA, 21GA, 22GA, 23GA ** ON A/C NOT FOR ALL
F MLG Extension Proximity Sensors 20GA, 21GA, 22GA, 23GA ** ON A/C NOT FOR ALL
NOTE: It is permitted to install a sensor target without a spacer if the correct clearance can be set without the spacer.
   (1) Make sure that the aircraft is lifted on jacks to fully extend the shock absorber (Ref. AMM TASK 07-11-00-581-001).
   (2) Make sure that the applicable MLG shock absorber is correctly filled and charged (Ref. AMM TASK 12-14-32-614-003).
   (3) For the rear proximity sensor 20GA (21GA):
  • If dimension X is incorrect, do the steps that follow:
NOTE: Dimension X must be between 3.9 mm (0.1535 in.) and 4.1 mm (0.1614 in.).
     (a) Measure dimensions F, G and H.
     (b) Use the formula to calculate dimension X.
     (c) Remove the nuts (18), the washers (17) and the screws (14).
     (d) Remove the target (15).
     (e) Remove and discard the spacer (16) if installed.
     (f) Make sure that the target mounting bracket is in the correct condition.
     (g) If necessary, adjust the new AIPC 32-11-11-53-050 SPACER (16) to get the correct dimension X.
NOTE: It is possible that two spacers are necessary.
     (h) Install the new spacer(s) (16) if necessary, and the target (15) together with:
  • The screws (14)
  • The washers (17)
  • The nuts (18).
     (i) TORQUE the nuts (18) to between 0.45 and 0.39 m.daN (39.82 and 34.51 lbf.in ) T.
     (j) Apply Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) to the areas that follow:
  • Around the joints between the target (15), the spacer (16) if installed, and the target mounting bracket
  • The heads and the ends of the screws (14)
  • The washers (17)
  • The nuts (18).
   (4) For the rear proximity sensor 20GA (21GA):
  • If dimension Z is incorrect, do the steps that follow:
NOTE: Dimension Z must be between 1.4 mm (0.0551 in.) and 1.6 mm (0.0630 in.).
     (a) Disconnect the electrical connector from the applicable proximity sensor 20GA (21GA).
     (b) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
     (c) Remove the nuts (13), the washers (12) and the screws (10).
     (d) Remove the applicable proximity sensor 20GA (21GA).
     (e) Remove and discard the spacer (11) if installed.
     (f) Make sure that the sensor mounting bracket is in the correct condition.
     (g) If necessary, adjust the new AIPC 32-11-11-24-095 SPACER (11) or the new AIPC 32-11-11-26-095 SPACER (11) to get the correct dimension Z.
NOTE: It is possible that two spacers are necessary.
     (h) Put the applicable proximity sensor 20GA (21GA) and the new spacer(s) (11) if necessary, in position on the sensor mounting bracket.
     (i) Install the screws (10), the washers (12) and the nuts (13).
     (j) TORQUE the nuts (13) to between 0.45 and 0.39 m.daN (39.82 and 34.51 lbf.in ) T.
     (k) Apply Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) to the areas that follow:
  • Around the joints between the applicable proximity sensor 20GA (21GA), the spacer (11) if installed, and the sensor mounting bracket
  • The heads and the ends of the screws (10)
  • The washers (12)
  • The nuts (13).
     (l) Remove the CAP-BLANKING from each electrical connector and receptacle.
     (m) Connect the electrical connector to the applicable proximity sensor 20GA (21GA).
   (5) For the forward proximity sensor 22GA (23GA):
  • If dimension X is incorrect, do the steps that follow:
NOTE: Dimension X must be between 3.9 mm (0.1535 in.) and 4.1 mm (0.1614 in.).
     (a) Measure dimensions J, K and L.
     (b) Use the formula to calculate dimension X.
     (c) Remove the nuts (7), the washers (6) and the screws (4).
     (d) Remove the target (3).
     (e) Remove and discard the spacer (5) if installed.
     (f) Make sure that the target mounting bracket is in the correct condition.
     (g) If necessary, adjust the new AIPC 32-11-11-83-150 SPACER (5) to get the correct dimension X.
NOTE: It is possible that two spacers are necessary.
     (h) Install the new spacer (5) if necessary, and the target (3) together with:
  • The screws (4)
  • The washers (6)
  • The nuts (7).
     (i) TORQUE the nuts (7) to between 0.45 and 0.39 m.daN (39.82 and 34.51 lbf.in ) T.
     (j) Apply Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) to the areas that follow:
  • Around the joints between the target (3), the spacer (5) if installed, and the target mounting bracket
  • The heads and the ends of the screws (4)
  • The washers (6)
  • The nuts (7).
   (6) For the forward proximity sensor 22GA (23GA):
  • If dimension Z is incorrect, do the steps that follow:
NOTE: Dimension Z must be between 1.4 mm (0.0551 in.) and 1.6 mm (0.0630 in.).
     (a) Disconnect the electrical connector from the applicable proximity sensor 22GA (23GA).
     (b) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
     (c) Remove the nuts (8), the washers (9) and the screws (2).
     (d) Remove the applicable proximity sensor 22GA (23GA).
     (e) Remove and discard the spacer (1) if installed.
     (f) Make sure that the sensor mounting bracket is in the correct condition.
     (g) If necessary, adjust the new AIPC 32-11-11-24-055 SPACER (1) or the new AIPC 32-11-11-26-055 SPACER (1) to get the correct dimension Z.
NOTE: It is possible that two spacers are necessary.
     (h) Put the applicable proximity sensor 22GA (23GA) and the new spacer (1) if necessary, in position on the sensor mounting bracket.
     (i) Install the screws (2), the washers (9) and the nuts (8).
     (j) TORQUE the nuts (8) to between 0.45 and 0.39 m.daN (39.82 and 34.51 lbf.in ) T.
     (k) Apply Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) to the areas that follow:
  • Around the joints between the applicable proximity sensor 22GA (23GA), the spacer (1) if installed, and the sensor mounting bracket
  • The heads and the ends of the screws (2)
  • The washers (9)
  • The nuts (8).
     (l) Remove the CAP-BLANKING from each electrical connector and receptacle.
     (m) Connect the electrical connector to the applicable proximity sensor 22GA (23GA).
   (7) Do a check of the proximity-sensor detection range given in Para. 4.B.
Subtask 32-31-73-865-072-A
D. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
49VUL/G/LGCIU/SYS1/NORM1GAC09
** ON A/C NOT FOR ALL
121VULGCIU/BAT SPLY/SYS259GAR33
121VULGCIU/BAT SPLY/SYS158GAR32
** ON A/C ALL
121VUHYDRAULIC/LGCIU/SYS22GAQ35
121VUHYDRAULIC/LGCIU/SYS1/GRND SPLY52GAQ34
** ON A/C NOT FOR ALL
121VULGCIU/BAT SPLY/SYS259GAR32
121VULGCIU/BAT SPLY/SYS158GAR31
Subtask 32-31-73-582-058-A
E. Lower the Aircraft
   (1) Lower the aircraft off jacks (Ref. AMM TASK 07-11-00-586-002).
Subtask 32-31-73-740-058-A
F. Test
   (1) Do a BITE test of the landing gear (Ref. AMM TASK 32-69-00-740-001).
Subtask 32-31-73-860-060-A
G. Aircraft Maintenance Configuration
   (1) If you did the flight configuration precautions, put the aircraft back to the ground configuration (Ref. AMM TASK 32-00-00-860-002).
Subtask 32-31-73-410-057-A
H. Close Access
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Remove the access platform(s).
   (3) Close the MLG doors (Ref. AMM TASK 32-12-00-410-001).
5. Close-up
Subtask 32-31-73-942-058-A
A. Removal of Equipment
   (1) Remove the SAFETY BARRIER(S).
   (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 00:45:58 UTC
"Aviabrain" 2025