W DOC AIRBUS | AMM A320F

Resistance Check of the Proximity Sensors

TASK 32-31-73-820-009-A
Resistance Check of the 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.
1. Reason for the Job
Self explanatory
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
INDUCTANCE METER 1KHZ
No specific
1
MULTIMETER - STANDARD
No specific
AR
SAFETY BARRIER(S)
No specific
AR
TESTER - INSULATION RESISTANCE
No specific
1
WARNING NOTICE(S)
38-798-01
1
A320FAM LGCIU BREAKOUT BOX
98D27803500001
1
LOCKING TOOL ZERO POS
 B. 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 27-50-00-866-009-A
Retraction of the Flaps on the Ground
TASK 27-50-00-866-009-A-01
Retraction of the Flaps/Slats on the Ground
TASK 32-00-00-481-001-A
Installation of the Safety Devices on the Landing Gears
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 32-22-00-010-001-A
Nose Gear Doors - Ground Doors Opening
TASK 32-22-00-410-001-A
Nose Gear Doors - Ground Doors Closing
TASK 32-31-71-000-001-A
Removal of the LGCIU
TASK 32-31-71-400-001-A
Installation of the LGCIU
TASK 32-31-73-000-001-A
Removal of the MLG Proximity-Sensors
TASK 32-31-73-000-005-A
Removal of the NLG Proximity-Sensors
TASK 32-31-73-400-001-A
Installation of the MLG Proximity-Sensors
TASK 32-31-73-400-005-A
Installation of the NLG Proximity-Sensors
TASK 52-30-00-860-001-A
Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
TASK 52-30-00-860-002-A
Close the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
ASM 323103
ASM 323104
F Proximity Sensor - Pin Arrangement
F Crane Proximity-Sensor Breakout-Box
F Resistance/Inductance Values
F Proximity Sensor/Switch Inductance Check Data - Aircraft On-Ground Condition
F Proximity Sensor/Switch Inductance Check Data - Simulated Flight Condition
3. Job Set-up
Subtask 32-31-73-941-066-A
A. Safety Precautions
   (1) Put the SAFETY BARRIER(S) in position.
   (2) Install the ground safety locks on the landing gear (Ref. AMM TASK 32-00-00-481-001).
   (3) On the 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.
   (4) Put a WARNING NOTICE(S) on the GRAVITY GEAR EXTN handle (panel 110VU) to tell persons not to operate the landing gear.
Subtask 32-31-73-860-072-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) Make sure that the flaps are fully retracted (Ref. AMM TASK 27-50-00-866-009).
   (2) Install the 98D27803500001 LOCKING TOOL ZERO POS on the flap/slat control lever.
   (3) Open the MLG doors (Ref. AMM TASK 32-12-00-010-001).
     (a) Make sure a 460005835 SLEEVE - GROUND LOCK is correctly installed on each MLG door actuating-cylinder.
   (4) Open the NLG doors (Ref. AMM TASK 32-22-00-010-001).
     (a) Make sure that a 98D32203502000 SAFETY PIN - NLG DOOR is correctly installed in the rigging holes of each NLG door.
   (5) Open the FWD and AFT cargo-compartment doors (Ref. AMM TASK 52-30-00-860-001).
     (a) Make sure that a 98D52307515000 SAFETY LOCK-ACTUATOR,CARGO DOORS is correctly installed on the actuator of each cargo-compartment door.
4. Procedure
Subtask 32-31-73-760-053-A
A. Resistance Check of the Proximity Sensors without the LGCIU Breakout Box (38-798-01)
NOTE: This subtask gives the procedure for the resistance check without the breakout box. If you want to do the resistance check with the breakout box, go to Para. 4.B.
   (1) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).
   (2) At the applicable proximity sensor, disconnect the electrical connector.
   (3) Use a MULTIMETER - STANDARD to measure and record the DC resistance between pins A and B of the applicable proximity sensor ASM 323103 or ASM 323104.
     (a) The sensor coil resistance must be:
  • 11 to 13 ohms for a ferrite proximity sensor (P/N 8-484-01 or ABS0121-10)
  • 16 to 18 ohms for an all metal proximity sensor (P/N 8-933-01 or ABS0121-40).
   (4) Connect pins A and B of the applicable proximity sensor together.
   (5) Connect one test lead of a TESTER - INSULATION RESISTANCE to the pins AB and the other test lead to the case.
   (6) Slowly supply a test signal at 50VDC for 5 seconds and read the resistance value shown.
     (a) The resistance value must be more than 400 megohms.
   (7) If necessary replace the applicable defective proximity sensor, (Ref. AMM TASK 32-31-73-000-001), (Ref. AMM TASK 32-31-73-400-001), (Ref. AMM TASK 32-31-73-000-005) and (Ref. AMM TASK 32-31-73-400-005).
Subtask 32-31-73-760-054-A
B. Resistance/Inductance Check of the Proximity-Sensors with the LGCIU Breakout Box (38-798-01)
NOTE: This subtask gives the procedure for the resistance check with the breakout box. If you want to do the resistance check without the breakout box, go to Para. 4.A.
NOTE: You can do this check with the aircraft on ground or on jacks. If the resistance and inductance values were measured before, compare the measured values in the same aircraft configuration.
   (1) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).
   (2) Remove the LGCIU 1 (Ref. AMM TASK 32-31-71-000-001).
   (3) Install the 38-798-01 A320FAM LGCIU BREAKOUT BOX.
   (4) Set the 38-798-01 A320FAM LGCIU BREAKOUT BOX rocker switch and rotary switch to position 1.
   (5) Connect the INDUCTANCE METER 1KHZ to the front panel of the 38-798-01 A320FAM LGCIU BREAKOUT BOX.
   (6) To measure the resistance and inductance of each proximity-sensor:
   (7) Record the resistance and inductance values in the record sheet.
F Resistance/Inductance Values
   (8) Remove the 38-798-01 A320FAM LGCIU BREAKOUT BOX from the LGCIU 1 position.
   (9) Install the LGCIU 1 (Ref. AMM TASK 32-31-71-400-001).
   (10) Remove the LGCIU 2 (Ref. AMM TASK 32-31-71-000-001).
   (11) Install the 38-798-01 A320FAM LGCIU BREAKOUT BOX on the LGCIU 2 rack position.
   (12) Set the 38-798-01 A320FAM LGCIU BREAKOUT BOX rocker switch and rotary switch to position 1.
   (13) Connect the INDUCTANCE METER 1KHZ to the front panel of the 38-798-01 A320FAM LGCIU BREAKOUT BOX.
   (14) Measure the resistance and inductance values between pins A and B of the applicable proximity-sensors ASM 323104 as follows:
F Crane Proximity-Sensor Breakout-Box
     (a) For each proximity-sensor, turn the rotary switch clockwise from positions 1 thru 18.
     (b) For FWD cargo door proximity-sensor, set the rotary switch to position 3 and the rocker switch to position 2.
     (c) For AFT cargo door proximity-sensor, set the rotary switch to position 4 and the rocker switch to position 2.
   (15) Record the resistance and inductance values in the record sheet.
F Resistance/Inductance Values
   (16) Remove the 38-798-01 A320FAM LGCIU BREAKOUT BOX from the LGCIU 2 rack position.
   (17) Install the LGCIU 2 (Ref. AMM TASK 32-31-71-400-001).
   (18) Keep the record sheet to compare the resistance and inductance values.
   (19) If the resistance and inductance values were measured before, compare the measured values and record the changes.
   (20) Make sure that the resistance values of the applicable proximity-sensors are:
  • 10 to 25 ohms for a ferrite proximity-sensor (P/N 8-484-01 or ABS0121-10)
  • 13 to 30 ohms for metal proximity-sensors (P/N 8-933-01 or ABS0121-40).
   (21) Make sure that the inductance values of the applicable proximity-sensors are in line with the applicable table.
F Proximity Sensor/Switch Inductance Check Data - Aircraft On-Ground Condition
F Proximity Sensor/Switch Inductance Check Data - Simulated Flight Condition
   (22) If the resistance and inductance values are not correct, do the applicable troubleshooting procedure.
5. Close-up
Subtask 32-31-73-860-073-A
A. Aircraft Maintenance Configuration
   (1) Close the FWD and aft cargo-compartment doors (Ref. AMM TASK 52-30-00-860-002).
   (2) Close the NLG doors (Ref. AMM TASK 32-22-00-410-001).
   (3) Close the MLG doors (Ref. AMM TASK 32-12-00-410-001).
   (4) Remove the 98D27803500001 LOCKING TOOL ZERO POS from the flap/slat control lever.
Subtask 32-31-73-942-064-A
B. Close Access
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Remove the SAFETY BARRIERS.
   (3) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
   (4) Remove the WARNING NOTICE(S).
[Rev.10 from 2021] 2026.04.01 00:46:06 UTC
"Aviabrain" 2025