Vacuum System Controller Failure

TASK 38-31-00-810-806-A
Vacuum System Controller Failure

1. Possible Causes

CONTROLLER VACUUM SYS [31MG]

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
ASM 383111
AMM 38-31-34-000-001	Removal of the Vacuum System Controller
AMM 38-31-34-400-001	Installation of the Vacuum System Controller
MCDU Display

3. Fault Confirmation
Subtask 38-31-00-710-067-A ** ON A/C NOT FOR ALL

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

Subtask 38-31-00-740-057-A ** ON A/C NOT FOR ALL

B. Do the bite test AMM 38-31-00-740-001.

4. Fault Isolation
Subtask 38-31-00-810-055-B ** ON A/C NOT FOR ALL

A. If the operational test does no operate:

refer to the bite test last leg or previous legs report.

(1) If the LAST LEG REPORT or PREVIOUS LEGS REPORT gives the maintenance message

MCDU Display ** ON A/C NOT FOR ALL

VSC
POWER SUPPLY: or
VSC
ARINC TRANSMITTER: or
VSC
RAM: or
VSC
EPROM: or
VSC
EEPROM: or
VSC
A/D.D/A CONVERTER: or
VSC
WATCHDOG TIMER: or
VSC
FEEDBACK
FAULTY LAV X: or
VSC
FEEDBACK
SYSTEM INOPERATIVE: or
VSC
FEEDBACK
LIQUID LEVEL SENSOR
TEST: or
VSC
FEEDBACK
PRECHARGE INDICATION: or
VSC
FEEDBACK
FLUSH ENABLE LAV X: or
VSC
FEEDBACK
MOTOR STARTING RELAY:

replace the CONTROLLER VACUUM SYS [31MG] , AMM 38-31-34-000-001 and AMM 38-31-34-400-001.

(2) If the fault continues:

do a check and repair the aircraft wiring ASM 383111 as necessary.

Subtask 38-31-00-710-055-A ** ON A/C NOT FOR ALL

B. Test
(1) Do the test as given in paragraph 3. A. to check the correct operation of the vacuum toilet system AMM 38-31-00-710-009.
(2) After the subsequent flight, make sure that the fault does not continue.

[Rev.8 from Aug 2018] 2026.04.04 04:34:13 UTC