Vacuum Toilet Assy Failure

TASK 38-31-00-810-834-A
Vacuum Toilet Assy Failure

1. Possible Causes

toilet assembly
WATER VALVE
FLUSH VALVE
AIRCRAFT WIRING

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 38-31-00-040-002	DEACTIVATION OF A TOILET ASSEMBLY
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 38-31-41-000-001	Removal of a Toilet Assembly
AMM 38-31-41-400-001	Installation of a Toilet Assembly
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
TSM TASK 38-31-00-03	TOILET SYSTEM - TASK SUPPORTING DATA
MCDU Display

3. Fault Confirmation
Subtask 38-31-00-710-115-A ** ON A/C NOT FOR ALL

A. Do a test of the vacuum toilet system AMM 38-31-00-710-009.

Subtask 38-31-00-740-069-A ** ON A/C NOT FOR ALL

B. Do the procedure to get access to the CFDS SYSTEM REPORT/TEST menu PAGE AMM 38-31-00-740-001.

4. Fault Isolation
Subtask 38-31-00-810-163-A ** ON A/C NOT FOR ALL

A. If the LAST/PREVIOUS LEGS Report gives the maintenance message
TOILET ASSY LAV X:

Replace the toilet assembly AMM 38-31-41-000-001 and AMM 38-31-41-400-001.

NOTE: The toilet assembly is a LRU (Line Replaceable Unit). AIRBUS recommends the replacement of the full LRU.
If necessary, you can replace components of the toilet assembly.
You can refer to the applicable error code on the trouble shooting data page. With the error code you can find the defective component.

If it is not possible to replace the toilet assembly, disconnect the toilet assembly AMM 38-31-00-040-002.

Subtask 38-31-00-810-132-A ** ON A/C NOT FOR ALL

B. If the LAST/PREVIOUS LEGS Report gives the maintenance message
TOILET ASSY LAV X:

push the CLASS line key adjacent to the message, the Trouble Shooting Data page comes in view.

(1) Look at the error codes on the trouble shooting data page 38-31-00-03 TSM TASK 38-31-00-03.
(2) If the last two characters in block 5 of the hexadecimal binary code are:
01

replace the WATER VALVE , AMM 38-31-55-000-001 and AMM 38-31-55-400-001.

Subtask 38-31-00-810-135-A ** ON A/C NOT FOR ALL

C. If the LAST LEG/PREVIOUS LEG REPORT gives the maintenance message TOILET ASSY X:

push the CLASS line key adjacent to the message, the Trouble Shooting Data page comes in view.

(1) Look at the error codes on the trouble shooting data page 38-31-00-03 TSM TASK 38-31-00-03.
(2) If the last two characters of block 5 of the hexadecimal binary code are:
02 or
04 or
08

replace the FLUSH VALVE , AMM 38-31-57-000-001 and AMM 38-31-57-400-001.

Subtask 38-31-00-810-137-A ** ON A/C NOT FOR ALL

D. If the LAST LEG/PREVIOUS LEG REPORT gives the maintenance message TOILET ASSY X:

push the CLASS line key adjacent to the message, the Trouble Shooting Data page comes in view.

(1) Look at the error codes on the trouble shooting data page 38-31-00-03 TSM TASK 38-31-00-03.
(2) If the last two characters in block 5 of the hexadecimal binary code are:
40

do a check of the AIRCRAFT WIRING between the DEU-B and the related lavatory and repair if necessary ASM 383111.

Subtask 38-31-00-710-118-A ** ON A/C NOT FOR ALL

E. Test
(1) Do the test as given in paragraph 3. A. to check the correct operation.
(2) After the subsequent flight, make sure that the fault does not continue.

[Rev.8 from Aug 2018] 2026.04.04 04:34:15 UTC