Operational Test of the Toilet Unit

TASK 38-31-00-710-009-A
Operational Test of the Toilet Unit

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 38-10-00-614-001-A	Pressurization of the Potable Water System from a Ground Air Supply
TASK 38-10-00-614-002-A	Depressurization of the Potable Water System

3. Job Set-up
Subtask 38-31-00-861-060-A

A. Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 38-31-00-010-072-A

B. Get Access
(1) Get access to the lavatory.
(2) Make sure that the waste service-panel door 172AR is closed.

Subtask 38-31-00-865-124-A

C. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-VACUUM-SYS	35MG	A06
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-VACUUM-GEN	33MG	A08
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-LAV PWR-E	34MG	A04
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-LAV PWR-D	39MG	A03
** ON A/C ALL
2001VU	VACU TOIL SYS-LAV PWR-A	32MG	A01
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-VACU-SYS	35MG	A06
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-VACU-GEN	33MG	A08
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-LAV PWR-G	34MG	A04
2001VU	VACU TOIL SYS-LAV PWR-F	39MG	A03
2001VU	VACU TOIL SYS-LAV PWR-D	45MG	A02
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-LAV PWR-L	45MG	A02
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-LAV PWR-L	23MG	A05
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-LAV PWR-M	34MG	A04

Subtask 38-31-00-614-052-A

D. Pressurize the potable water system (Ref. AMM TASK 38-10-00-614-001).

4. Procedure
Subtask 38-31-00-710-062-A ** ON A/C NOT FOR ALL

A. Do this test.

ACTION	RESULT
1.In all lavatories: push each flush switch 51MG with a time delay of 15 +3 -3 s.	In the vacuum toilet system: the vacuum generator 37MG operates. approx. 0.2 l (0.05 USgal) of water flows into the toilet bowl. air flows out of the ventilation port of the vacuum generator. the toilet flush valve opens and the suction removes the water.
2.At the waste service panel: open the waste service-panel door 172AR.
3.In two lavatories: push the flush switch 51MG.	In the vacuum system: the vacuum generator 37MG does not operate. the toilet does not flush.
4.At the waste service panel: close the waste service-panel door 172AR.
5.In the lavatory: push the flush switch 51MG.	In the vacuum toilet system: the vacuum generator 37MG operates. the toilet flushes correctly.

Subtask 38-31-00-710-062-C ** ON A/C NOT FOR ALL

A. Do this test.

NOTE: Incorrect failure messages can show on the MCDU or FAP when a toilet flush occurs flight.
Make sure that no failure messages show on the Previous Flight Report or Last Leg Report before you do this test.

ACTION	RESULT
1.In all lavatories: push each flush switch 51MG with a time delay of 15 +3 -3 s.	In the vacuum toilet system: the vacuum generator 37MG operates. approx. 0.2 l (0.05 USgal) of water flows into the toilet bowl. air flows out of the ventilation port of the vacuum generator. the toilet flush valve opens and the suction removes the water.
2.In two lavatories: push the flush switch of both toilets with a delay of 7 s.	In the vacuum system: the vacuum generator 37MG starts to operate and remains on until both toilets flush are completed.
3.At the waste service panel: open the waste service-panel door 172AR.
4.In two lavatories: push the flush switch 51MG.	In the vacuum system: the vacuum generator 37MG does not operate. the toilet does not flush.
5.At the waste service panel: close the waste service-panel door 172AR.
6.In the lavatory: push the flush switch 51MG.	In the vacuum toilet system: the vacuum generator 37MG operates. the toilet flushes correctly.

5. Close-up
Subtask 38-31-00-614-053-A

A. Release the pressure from the potable water system (Ref. AMM TASK 38-10-00-614-002).

Subtask 38-31-00-410-070-A

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the access platform(s).

Subtask 38-31-00-862-060-A

C. De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

Subtask 38-31-00-942-063-A

D. Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.01 04:27:18 UTC