115 Volt Failure

TASK 38-31-00-810-840-A
115 Volt Failure

1. Possible Causes

RELAY [36MG]
RELAY-FAN PHASE OFF [38MG]
AIRCRAFT WIRING
GENERATOR,VACUUM [37MG]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ESPM 2046500
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 383110
AMM 38-31-36-000-001	Removal of the Motor Start Relay
AMM 38-31-36-400-001	Installation of the Motor Start Relay
AMM 38-31-64-000-001	Removal of the Vacuum Generator
AMM 38-31-64-400-001	Installation of the Vacuum Generator
MCDU Display

3. Fault Confirmation
Subtask 38-31-00-710-127-A ** ON A/C NOT FOR ALL

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

Subtask 38-31-00-740-075-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 38-31-00-810-142-A ** ON A/C NOT FOR ALL

A. If the LAST/PREVIOUS LEGS Report gives the maintenance message
VACU GEN (37MG) SUPPLY
and
the FAP gives the maintenance message VACUUM SYSTEM DISABLED ON GROUND:

replace the RELAY [36MG] , AMM 38-31-36-000-001 and AMM 38-31-36-400-001.

(1) If the fault continues:

replace the RELAY-FAN PHASE OFF [38MG] , ESPM 2046500.

(2) If the fault continues:

do a check of the AIRCRAFT WIRING and repair as necessary ASM 383110.

(3) If the fault continues:

replace the GENERATOR,VACUUM [37MG] , AMM 38-31-64-000-001 and AMM 38-31-64-400-001.

Subtask 38-31-00-710-128-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