Vacuum Toilet Assy Failure

TASK 38-31-00-810-835-A
Vacuum Toilet Assy Failure

1. Possible Causes

Flush Valve

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
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
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 38-31-00-710-116-A ** ON A/C NOT FOR ALL

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

Subtask 38-31-00-740-070-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 38-31-00-810-133-D ** ON A/C NOT FOR ALL

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

Look at the error codes on the trouble shooting data page 38-31-00-03 TSM TASK 38-31-00-03.

(1) If the last two characters in block 5 of the hexadecimal binary code are:
20
and the FAP gives the maintenance message
SHUT OFF WATER SUPPLY LAV XX:

replace the Flush Valve , AMM 38-31-57-000-001 and AMM 38-31-57-400-001.

Subtask 38-31-00-710-119-A ** ON A/C NOT FOR ALL

B. 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