W DOC AIRBUS | TSM A320F

Toilet Assembly Failure

TASK 38-31-00-810-824-A
Toilet Assembly Failure

1. Possible Causes
  • Water Quantity
  • Water Line Connections
  • flush switch
  • Flush Control Unit (FCU)
  • Water Valve
  • Blockage
  • Flush Valve
  • Flush Ring
  • Water Valve Screen
  • Potable Water Line Connections
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 12-15-38-613-001
Fill the Potable Water Tank System (Aircraft Electrical Power Available)
AMM 38-30-00-615-001
Blockage Removal from the Toilet Flush Valve
AMM 38-31-00-710-009
Operational Test of the Toilet Unit
AMM 38-31-00-740-001
BITE Test of the Vacuum Toilet System
ASM 383111
AMM 38-31-12-000-001
Removal of the Flush Control Unit
AMM 38-31-12-400-001
Installation of the Flush Control Unit
AMM 38-31-19-000-001
Removal of the Toilet Flush Switch
AMM 38-31-19-400-001
Installation of the Toilet Flush Switch
AMM 38-31-55-000-001
Removal of the Water Valve
AMM 38-31-55-400-001
Installation of the Water Valve
AMM 38-31-57-000-001
Removal of the Flush Valve
AMM 38-31-57-400-001
Installation of the Flush Valve
F MCDU Display
3. Fault Confirmation
Subtask 38-31-00-710-093-A ** ON A/C NOT FOR ALL
A. Fault Confirmation
   (1) Make sure that the circuit breakers of the vacuum toilet system are closed.
   (2) Do an operational test of the toilet assembly AMM 38-31-00-710-009.
Subtask 38-31-00-740-056-A ** ON A/C NOT FOR ALL
B. Do the bite test AMM 38-31-00-740-001.
4. Fault Isolation
Subtask 38-31-00-810-107-A ** ON A/C NOT FOR ALL
A. If the FAP gives the maintenance message LAV X INOP:
   (1) Refer to the LAST LEG REPORT or PREVIOUS LEGS REPORT page of the bite test.
F MCDU Display ** ON A/C NOT FOR ALL
Subtask 38-31-00-810-108-A ** ON A/C NOT FOR ALL
B. If the toilet will not rinse or flush when the flush switch is pushed:
  • do a check on all the other toilets.
   (1) If the other toilets also do not rinse or flush:
  • do a check of the Water Quantity on the forward attendant panel 120RH.
   (2) If the water level is low or the tank is empty:
   (3) If the fault continues:
  • Open and close the circuit breaker 32MG or 34MG.
  • do a check of the potable Water Line Connections .
NOTE: Make sure that the shut off valve 3025MM is open.
   (4) If the fault continues:
  • do a check for continuity between pins B and K of the plug 50MG1/A, 50MG2/A, 50MG3/A, 50MG4/A or 50MG7/A with the flush switch pushed ASM 383111.
  • if there is continuity with the flush switch release:
  • replace the flush switch , AMM 38-31-19-000-001 and AMM 38-31-19-400-001.
   (5) If the fault continues:
   (6) If the fault continues:
   (7) If the toilet outlet stays open:
     (a) If the fault continues:
     (b) If the fault continues:
   (8) If toilet bowl is constantly rinsed:
  • disconnect the electrical connector of the water valve from the flush control unit (FCU).
     (a) If the fault continues:
   (9) If the water stops:
Subtask 38-31-00-810-109-A ** ON A/C NOT FOR ALL
C. If the flush cycle does not continue for 4 s when the flush switch is pushed:
   (1) If the rinse water during flush is not sufficient when the flush switch is pushed:
  • do a check of the Flush Ring and clean if necessary.
NOTE: Make sure that the shut off valve 3025MM is open.
     (a) If the fault continues:
  • do a check of the Water Valve Screen and clean if necessary.
     (b) If the fault continues:
     (c) If the fault continues:
  • do a check of the Potable Water Line Connections .
5. Close-up
Subtask 38-31-00-860-056-A ** ON A/C NOT FOR ALL
A. Close Access
   (1) Do the test given in Para. 3.
   (2) After the subsequent flight, make sure that the fault does not continue.
[Rev.8 from Aug 2018] 2026.04.04 04:34:14 UTC
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