W DOC AIRBUS | TSM A320F

Difference of Temperature between the two Brakes on a Same Gear

TASK 32-42-00-810-921-A
Difference of Temperature between the two Brakes on a Same Gear

1. Possible Causes
  • message related to the braking system
  • wiring of the tachometers
  • wiring of the Normal or Alternate brake servovalves
  • BRAKE-WHEEL 2 [2641GM]
  • BRAKE-WHEEL 4 [2642GM]
  • BRAKE-WHEEL 1 [2643GM]
  • BRAKE-WHEEL 3 [2644GM]
  • MONITORING UNIT-BRK TEMP, R [2GW]
  • MONITORING UNIT-BRK TEMP, L [3GW]
  • SAFETY VALVE-NORM BRK, WHEEL 2 [2616GM]
  • SAFETY VALVE-NORM BRK, WHEEL 3 [2617GM]
  • SAFETY VALVE-NORM BRK, WHEEL 1 [2618GM]
  • SAFETY VALVE-NORM BRK, WHEEL 4 [2619GM]
  • SAFETY VALVE-ALTN BRK, WHEEL 4 [2621GM]
  • SAFETY VALVE-ALTN BRK, WHEEL 2 [2622GM]
  • SAFETY VALVE-ALTN BRK, WHEEL 3 [2623GM]
  • SAFETY VALVE-ALTN BRK, WHEEL 1 [2620GM]
  • PRESS XDCR-NORM BRK WHEEL 1 [11GG]
  • PRESS XDCR-NORM BRK WHEEL 3 [12GG]
  • PRESS XDCR-NORM BRK WHEEL 2 [13GG]
  • PRESS XDCR-NORM BRK WHEEL 4 [14GG]
  • drive assy-tachometer
  • TACHOMETER
  • NORMAL SERVO-VALVE
  • a message related to the braking system
  • wiring of the Normal brake servovalves
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
TSM TASK 32-42-00-810-844-A
Drift of the Normal Brake Servovalve (Wheel 1)
TSM TASK 32-42-00-810-845-A
Drift of the Normal Brake Servovalve (Wheel 3)
TSM TASK 32-42-00-810-846-A
Drift of the Normal Brake Servovalve (Wheel 2)
TSM TASK 32-42-00-810-847-A
Drift of the Normal Brake Servovalve (Wheel 4)
TSM TASK 32-48-00-810-801-A
Brake Fan Inoperative on One Brake
AMM 31-32-00-869-002
Procedure for the Class 3 Fault Reading
AMM 32-42-00-720-002
Functional Test of the Tachometers and the Anti-Skid System with the Normal Braking System ON
AMM 32-42-00-870-001
Bleeding of the Normal Braking at the Brake Units
ASM 324202
AMM 32-42-21-000-001
Removal of the Normal-Brake Pressure Transducer
AMM 32-42-21-400-001
Installation of the Normal-Brake Pressure Transducer
AMM 32-42-27-000-001
Removal of the Brake
AMM 32-42-27-210-006
Inspection/Check of the Brake with the Wheel Removed
AMM 32-42-27-400-001
Installation of the Brake
AMM 32-42-36-000-001
Removal of the Normal Brake Safety-Valve
AMM 32-42-36-400-001
Installation of the Normal Brake Safety-Valve
AMM 32-42-48-000-001
Removal of the Normal Brake Servovalve
AMM 32-42-48-400-001
Installation of the Normal Brake Servovalve
AMM 32-42-57-000-001
Removal of the Tachometer
AMM 32-42-57-400-001
Installation of the Tachometer
AMM 32-42-68-000-003
Removal of the MLG Tachometer-Drive
AMM 32-42-68-400-003
Installation of the MLG Tachometer-Drive
AMM 32-43-00-870-002
Bleeding of the High Pressure Alternate Braking System
ASM 324301
AMM 32-43-16-000-001
Removal of the Alternate Brake Safety-Valve
AMM 32-43-16-400-001
Installation of the Alternate Brake Safety-Valve
AMM 32-47-00-710-002
Operational Check of Channel 1 (2) of the Brake Temperature Monitoring Unit
AMM 32-47-18-000-001
Removal of the Brake Temperature Monitoring Unit
AMM 32-47-18-400-001
Installation of the Brake Temperature Monitoring Unit
3. Fault Confirmation
Subtask 32-42-00-710-080-A
A. Test
   (1) Not applicable.
4. Fault Isolation
Subtask 32-42-00-810-177-A ** ON A/C NOT FOR ALL
A. Do a check for a message related to the braking system on the POST FLIGHT REPORT (PFR) if the conditions that follow occur:
  • If the difference of temperature between the two brakes on a same landing gear is more than 150 deg.C (302.00 deg.F) (or frequently near this value) and if the temperature of one brake is more than 600 deg.C (1112.00 deg.F), or
  • If the difference of temperature between the two brakes on a same landing gear is more than 150 deg.C (302.00 deg.F) (or frequently near this value) and if the temperature of one brake is less than 60 deg.C (140.00 deg.F).
   (1) If there is a message:
  • Do the trouble shooting procedure related to the maintenance message.
   (2) If there is no message:
     (a) Read the CLASS 3 FAULTS report AMM 31-32-00-869-002.
       1 If the CLASS 3 FAULTS report give the maintenance message:
  • BRK NORM SERVOVALVE 15GG
  • BRK NORM SERVOVALVE 16GG
  • BRK NORM SERVOVALVE 17GG
  • BRK NORM SERVOVALVE 18GG.
         a Do the procedure related to a drift of the normal brake servovalve of the related wheel (Ref. TSM TASK 32-42-00-810-844) or (Ref. TSM TASK 32-42-00-810-845) or (Ref. TSM TASK 32-42-00-810-846) or (Ref. TSM TASK 32-42-00-810-847).
   (3) If the fault continues:
   (4) if the test is OK:
  • Continue the trouble shooting at step 4.A.(5).
   (5) If the test is not OK:
  • Do a check of the wiring of the tachometers for cross connection ASM 324202.
  • Do a check of the wiring of the Normal or Alternate brake servovalves for cross connection ASM 324202 ASM 324301.
   (6) If the fault continues:
     (a) If necessary replace the BRAKE-WHEEL 2 [2641GM] or BRAKE-WHEEL 4 [2642GM] or BRAKE-WHEEL 1 [2643GM] or BRAKE-WHEEL 3 [2644GM] AMM 32-42-27-000-001 AMM 32-42-27-400-001.
     (b) If there are no leak or damage:
   (7) If the inspections are correct:
  • Do the check of channel 1(2) of the related Brake Temperature Monitoring Unit AMM 32-47-00-710-002.
   (8) Following the check of channels of the related BTMU, if output voltages are not correct:
   (9) If the check of the BTMU channels is correct and if the fault continues:
   (10) If the fault continues:
   (11) If the fault continues:
  • Do an inspection of the drive assy of the related tachometer.
     (a) If the tachometer drive is damaged:
     (b) If the tachometer drive is not damaged:
   (12) If the fault continues:
Subtask 32-42-00-810-177-C ** ON A/C NOT FOR ALL
A. Do a check for a message related to the braking system on the POST FLIGHT REPORT (PFR) if the conditions that follow occur:
  • If the difference of temperature between the two brakes on a same landing gear is more than 150 deg.C (302.00 deg.F) (or frequently near this value) and if the temperature of one brake is more than 600 deg.C (1112.00 deg.F), or
  • If the difference of temperature between the two brakes on a same landing gear is more than 150 deg.C (302.00 deg.F) (or frequently near this value) and if the temperature of one brake is less than 60 deg.C (140.00 deg.F).
   (1) If there is a message:
  • Do the troubleshooting procedure related to the maintenance message.
   (2) If there is no message:
     (a) Read the CLASS 3 FAULTS report AMM 31-32-00-869-002.
       1 If the CLASS 3 FAULTS report give the maintenance message:
  • BRK NORM SERVOVLV1(15GG)
  • BRK NORM SERVOVLV2(17GG)
  • BRK NORM SERVOVLV3(16GG)
  • BRK NORM SERVOVLV4(18GG).
         a Do the procedure related to a drift of the normal brake servovalve of the related wheel (Ref. TSM TASK 32-42-00-810-844) or (Ref. TSM TASK 32-42-00-810-845) or (Ref. TSM TASK 32-42-00-810-846) or (Ref. TSM TASK 32-42-00-810-847).
   (3) If the fault continues:
   (4) if the test is OK:
  • Continue the trouble shooting at step 4.A.(5).
   (5) If the test is not OK:
  • Do a check of the wiring of the tachometers for cross connection ASM 324202.
  • Do a check of the wiring of the Normal brake servovalves for cross connection ASM 324202 .
   (6) If the fault continues:
     (a) If necessary replace the BRAKE-WHEEL 2 [2641GM] or BRAKE-WHEEL 4 [2642GM] or BRAKE-WHEEL 1 [2643GM] or BRAKE-WHEEL 3 [2644GM] AMM 32-42-27-000-001 AMM 32-42-27-400-001.
     (b) If there are no leak or damage:
   (7) If the inspections are correct:
  • Do the check of channel 1(2) of the related Brake Temperature Monitoring Unit AMM 32-47-00-710-002.
   (8) Following the check of channels of the related BTMU, if output voltages are not correct:
   (9) If the check of the BTMU channels is correct and if the fault continues:
   (10) If the fault continues:
   (11) If the fault continues:
  • Do an inspection of the drive assy of the related tachometer.
     (a) If the tachometer drive is damaged:
     (b) If the tachometer drive is not damaged:
   (12) If the fault continues:
[Rev.8 from Aug 2018] 2026.04.04 04:31:37 UTC
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