Liquid Level Sensor Failure

TASK 38-31-00-810-805-A
Liquid Level Sensor Failure

1. Possible Causes

SENSOR,LEVEL [41MG]

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 38-31-63-000-001	Removal of the Liquid Level Sensor
AMM 38-31-63-400-001	Installation of the Liquid Level Sensor
MCDU Display ** ON A/C NOT FOR ALL

3. Fault Confirmation
Subtask 38-31-00-710-099-A ** ON A/C NOT FOR ALL

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

Subtask 38-31-00-740-054-A ** ON A/C NOT FOR ALL

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

4. Fault Isolation
Subtask 38-31-00-810-083-B ** ON A/C NOT FOR ALL

A. If the operational test is OK:

Refer to the trouble shooting page of the bite test.

(1) If the LAST LEG REPORT or PEVIOUS LEGS REPORT gives the maintenance message LIQD LVL SNSR:

MCDU Display ** ON A/C NOT FOR ALL

do a check of the electrical connections of the connector (41MG).

(2) If the electrical connections are OK:

replace the SENSOR,LEVEL [41MG] , AMM 38-31-63-000-001 and AMM 38-31-63-400-001.

Subtask 38-31-00-710-066-A

B. Test
(1) Do the operational test of the vacuum toilet system and make sure it operates correctly 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 04:34:12 UTC