W DOC AIRBUS | TSM A320F

Ice Formation in the Potable Water Lines

TASK 30-73-00-810-801-A
Ice Formation in the Potable Water Lines

1. Possible Causes
  • CONTROL UNIT, POTABLE WATERICE PROTECTION- [3DW]
  • HEATER ELEMENT(s)
  • SENSOR,TEMPERATURE- [10DW]
  • microfuse
  • aircraft wiring
  • CONTROL UNIT, POTABLE WATERICE PROTECTION- [23DW]
  • HEATER(s)
  • SENSOR,TEMPERATURE- [29DW]
  • SENSOR,TEMPERATURE- [30DW]
  • CONTROL UNIT, POTABLE WATERICE PROTECTION- [33DW]
  • SENSOR,TEMPERATURE- [40DW]
  • CONTROL UNIT, POTABLE WATERICE PROTECTION- [53DW]
  • SENSOR,TEMPERATURE- [60DW]
  • SENSOR,TEMPERATURE- [61DW]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
TSM TASK 30-71-00-810-805-A
Failure of FWD Waste-Water Ice-Protection System
AMM 30-73-00-720-001
Functional Test of the Potable Water Ice-Protection
AMM 30-73-00-740-001
BITE Test of the Potable Water Ice-Protection
ASM 307301
ASM 307302
AMM 30-73-17-000-001
Removal of the Potable-Water De-icing Sensor
AMM 30-73-17-400-001
Installation of the Potable-Water De-icing Sensor
AMM 30-73-18-000-001
Removal of the Potable Water De-icing Sensor
AMM 30-73-18-400-001
Installation of the Potable Water De-icing Sensor
AMM 30-73-19-000-001
Removal of Temperature Sensor 30DW
AMM 30-73-19-400-001
Installation of Temperature Sensor 30DW
AMM 30-73-34-000-001
Removal of the Potable and Waste Water Ice Protection Control Unit
AMM 30-73-34-000-002
Removal of the Potable and Waste Water Ice Protection Contol Unit and of the Potable Water Ice Protection Control Unit
AMM 30-73-34-400-001
Installation of the Potable and Waste Water Ice Protection Control Unit
AMM 30-73-34-400-002
Installation of the Potable and Waste water Ice Protection Control Unit and of the Potable Water Ice Protection Control Unit
AMM 30-73-35-000-001
Removal of the Potable-Water Ice-Protection Control-Unit 33DW
AMM 30-73-35-400-001
Installation of the Potable-Water Ice-Protection Control-Unit 33DW
AMM 30-73-53-000-001
Removal of the Potable-Water De-icing Heater Elements
AMM 30-73-53-400-001
Installation of the Potable-Water De-icing Heater Elements
AMM 30-73-54-000-001
Removal of the Inner Line Heater
AMM 30-73-54-400-001
Installation of the Inner Line Heater
AMM 30-73-55-000-001
Removal of the Potable-Water Heater Elements
AMM 30-73-55-400-001
Installation of the Potable-Water Heater Elements
3. Fault Confirmation
Subtask 30-73-00-710-050-A
A. Do the BITE test of the potable-water ice-protection AMM 30-73-00-740-001.
4. Fault Isolation
Subtask 30-73-00-810-050-A ** ON A/C NOT FOR ALL
A. Maintenance Action for CONTROL UNIT 3DW
   (1) If the green I/II LED of CONTROL UNIT 3DW does not come on:
Do a check of the related microfuses:
     (a) If the microfuses are OK:
Replace the CONTROL UNIT, POTABLE WATERICE PROTECTION- [3DW] AMM 30-73-34-000-001 and AMM 30-73-34-400-001.
       1 If the fault continues:
Do the functional test of the potable-water ice-protection AMM 30-73-00-720-001 and replace the related HEATER ELEMENT(s) which stay(s) cold AMM 30-73-53-000-001 and AMM 30-73-53-400-001.
         a If all applicable HEATER ELEMENTs stay cold:
Replace the SENSOR,TEMPERATURE- [10DW] AMM 30-73-17-000-001 and AMM 30-73-17-400-001.
     (b) If one microfuse is not OK:
Do a check for a short circuit and replace the microfuse ASM 307301.
   (2) If the green III/IV LED of the CONTROL UNIT 3DW does not come on:
Do the trouble shooting of the forward waste-water ice-protection system (Ref. TSM TASK 30-71-00-810-805)
   (3) If both green LEDs do not come on:
Replace the CONTROL UNIT, POTABLE WATERICE PROTECTION- [3DW] AMM 30-73-34-000-001 and AMM 30-73-34-400-001.
     (a) If the fault continues:
Do a check of the subsequent signals:
- 115VAC at connector 3DW-A/14,
- 28VDC at connector 3DW-A/16,
- GND at connector 3DW-A/12,
- GND at connector 3DW-A/15 ASM 307301.
       1 If one signal is missing:
Do a check and repair of the aircraft wiring ASM 307301.
Subtask 30-73-00-810-050-E ** ON A/C NOT FOR ALL
A. Maintenance Action for CONTROL UNIT 3DW
   (1) If the green I/II LED of CONTROL UNIT 3DW does not come on:
Do a check of the related microfuses:
     (a) If the microfuses are OK:
Replace the CONTROL UNIT, POTABLE WATERICE PROTECTION- [3DW] AMM 30-73-34-000-002 and AMM 30-73-34-400-002.
       1 If the fault continues:
Do the functional test of the potable-water ice-protection AMM 30-73-00-720-001 and replace the related HEATER ELEMENT(s) which stay(s) cold AMM 30-73-53-000-001 and AMM 30-73-53-400-001.
         a If all applicable HEATER ELEMENTs stay cold:
Replace the SENSOR,TEMPERATURE- [10DW] AMM 30-73-17-000-001 and AMM 30-73-17-400-001.
     (b) If one microfuse is not OK:
Do a check for a short circuit and replace the microfuse ASM 307301.
   (2) If the green III/IV LED of the CONTROL UNIT 3DW does not come on:
Do the trouble shooting of the forward waste-water ice-protection system (Ref. TSM TASK 30-71-00-810-805)
   (3) If both green LEDs do not come on:
Replace the CONTROL UNIT, POTABLE WATERICE PROTECTION- [3DW] AMM 30-73-34-000-002 and AMM 30-73-34-400-002.
     (a) If the fault continues:
Do a check of the subsequent signals:
- 115VAC at connector 3DW-A/14,
- 28VDC at connector 3DW-A/16,
- GND at connector 3DW-A/12,
- GND at connector 3DW-A/15 ASM 307301.
       1 If one signal is missing:
Do a check and repair of the aircraft wiring ASM 307301.
Subtask 30-73-00-810-051-A ** ON A/C NOT FOR ALL
B. Maintenance Action for CONTROL UNIT 23DW
   (1) If the green I/II LED of CONTROL UNIT 23DW does not come on:
  • do a check of the related microfuses:
     (a) If the microfuses are OK:
       1 If the fault continues:
         a If all applicable HEATERs stay cold:
     (b) If one microfuse is not OK:
  • do a check for a short circuit and replace the microfuse ASM 307301.
   (2) If the green III/IV LED of the CONTROL UNIT 23DW does not come on:
  • do a check of the related microfuses:
     (a) If the microfuses are OK:
       1 If the fault continues:
         a If all applicable HEATERs stay cold:
     (b) If one microfuse is not OK:
  • do a check for a short circuit and replace the microfuse ASM 307301.
   (3) If both green LEDs do not come on:
     (a) If the fault continues:
  • do a check of the subsequent signals:
    - 115VAC at connector 23DW-A/14,
    - 28VDC at connector 23DW-A/16,
    - GND at connector 23DW-A/12,
    - GND at connector 23DW-A/15 ASM 307301.
       1 If one signal is missing:
  • do a check and repair of the aircraft wiring ASM 307301.
Subtask 30-73-00-810-052-A ** ON A/C NOT FOR ALL
C. Maintenance Action for CONTROL UNIT 33DW
   (1) If the green I/II LED of the CONTROL UNIT 33DW does not come on:
   (2) If the green III/IV LED of CONTROL UNIT 33DW does not come on:
  • do a check of the related microfuses:
     (a) If the microfuses are OK:
       1 If the fault continues:
         a If all applicable HEATERs stay cold:
     (b) If one microfuse is not OK:
  • do a check for a short circuit and replace the microfuse ASM 307302.
   (3) If both green LEDs do not come on:
     (a) If the fault continues:
  • do a check of the subsequent signals:
    - 115VAC at connector 33DW-A/14,
    - 28VDC at connector 33DW-A/16,
    - GND at connector 33DW-A/12,
    - GND at connector 33DW-A/15 ASM 307302.
       1 If one signal is missing:
  • do a check and repair of the aircraft wiring ASM 307302.
Subtask 30-73-00-810-051-E ** ON A/C NOT FOR ALL
D. Maintenance Action for CONTROL UNIT 23DW
   (1) If the green I/II LED of CONTROL UNIT 23DW does not come on:
  • do a check of the related microfuses:
     (a) If the microfuses are OK:
       1 If the fault continues:
         a If all applicable HEATERs stay cold:
     (b) If one microfuse is not OK:
  • do a check for a short circuit and replace the microfuse ASM 307301.
   (2) If the green III/IV LED of the CONTROL UNIT 23DW does not come on:
  • do a check of the related microfuses:
     (a) If the microfuses are OK:
       1 If the fault continues:
         a If all applicable HEATERs stay cold:
     (b) If one microfuse is not OK:
  • do a check for a short circuit and replace the microfuse ASM 307301.
   (3) If both green LEDs do not come on:
     (a) If the fault continues:
  • do a check of the subsequent signals:
    - 115VAC at connector 23DW-A/14,
    - 28VDC at connector 23DW-A/16,
    - GND at connector 23DW-A/12,
    - GND at connector 23DW-A/15 ASM 307301.
       1 If one signal is missing:
  • do a check and repair of the aircraft wiring ASM 307301.
Subtask 30-73-00-810-052-F ** ON A/C NOT FOR ALL
E. Maintenance Action for CONTROL UNIT 33DW
   (1) If the green I/II LED of CONTROL UNIT 33DW does not come on:
  • Do a check of the related microfuses:
     (a) If the microfuses are OK:
       1 If the fault continues:
         a If all applicable HEATERs stay cold:
     (b) If one microfuse is not OK:
  • Do a check for a short circuit and replace the microfuse ASM 307302.
   (2) If the green LED does not come on:
     (a) If the fault continues:
  • Do a check of the signals that follow:
    - 115VAC at connector 33DW-A/14,
    - 28VDC at connector 33DW-A/16,
    - GND at connector 33DW-A/12,
    - GND at connector 33DW-A/15 ASM 307302.
       1 If one signal is missing:
  • Do a check and repair of the aircraft wiring ASM 307302.
Subtask 30-73-00-810-053-A ** ON A/C NOT FOR ALL
F. Maintenance Action for CONTROL UNIT 53DW
   (1) If the green I/II LED of CONTROL UNIT 53DW does not come on:
  • do a check of the related microfuses:
     (a) If the microfuses are OK:
       1 If the fault continues:
         a If all applicable HEATERs stay cold:
     (b) If one microfuse is not OK:
  • do a check for a short circuit and replace the microfuse ASM 307302.
   (2) If the green III/IV LED of the CONTROL UNIT 53DW does not come on:
  • do a check of the related microfuses:
     (a) If the microfuses are OK:
       1 If the fault continues:
         a If all applicable HEATERs stay cold:
     (b) If one microfuse is not OK:
  • do a check for a short circuit and replace the microfuse ASM 307302.
   (3) If both green LEDs do not come on:
     (a) If the fault continues:
  • do a check of the subsequent signals:
    - 115VAC at connector 53DW-A/14,
    - 28VDC at connector 53DW-A/16,
    - GND at connector 53DW-A/12,
    - GND at connector 53DW-A/15 ASM 307302.
       1 If one signal is missing:
  • do a check and repair of the aircraft wiring ASM 307302.
Subtask 30-73-00-710-051-A
G. Do the test as given in the Para. 3.A.
5. Close-up
Subtask 30-73-00-860-050-A
A. Put the aircraft back to its initial configuration.
[Rev.8 from Aug 2018] 2026.04.04 04:29:47 UTC
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