Operational Test of the Vacuum Toilet System

TASK 38-31-00-710-002-A
Operational Test of the Vacuum Toilet System

NOTE: The operational test of the vacuum toilet system in one lavatory is given. The procedure is the same for all the other lavatories.

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT)
No specific	1	ACCESS PLATFORM 3M (10 FT)
No specific	1	TEST UNIT-STATIC PITOT
98D38308234001	1	ADAPTER - ALTITUDE PRESSURE SWITCH

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
172AR
312AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 12-15-38-613-001-A	Fill the Potable Water Tank System (Aircraft Electrical Power Available)
TASK 12-16-38-613-001-A	Servicing of the Toilet System
TASK 23-73-00-861-001-A	Energize the Cabin Intercommunication Data System (CIDS)
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
TASK 32-69-00-860-001-A	Simulation of Flight (With Aircraft on Ground)
TASK 38-31-00-680-001-A	Draining of the Toilet System
Flush Cycle Schematic ** ON A/C NOT FOR ALL
Flush Cycle Schematic ** ON A/C NOT FOR ALL
CIDS Toilet SYS Status ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 38-31-00-861-052-A

A. Aircraft Maintenance Configuration
(1) Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).
(2) Make sure that the Cabin Intercommunication Data System (CIDS) is energized and is clear from all faults (Ref. AMM TASK 23-73-00-861-001).

Subtask 38-31-00-010-052-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Put the ACCESS PLATFORM 3M (10 FT) below the access panel 312AR.
(2) Put the ACCESS PLATFORM 2M (6 FT) below the access panel 172AR.
(3) Open the access panels 312AR 172AR.

Subtask 38-31-00-010-052-C ** ON A/C NOT FOR ALL

B. Get Access
(1) Put the ACCESS PLATFORM 2M (6 FT) below the access panel 172AR.
(2) Open the access panels 172AR.

Subtask 38-31-00-865-101-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 38-31-00-613-052-A

D. Filling of the Potable Water Tank System
(1) Fill the potable water tank system (Ref. AMM TASK 12-15-38-613-001).

Subtask 38-31-00-680-053-A

E. Draining of the Toilet System
(1) Drain the toilet system (Ref. AMM TASK 38-31-00-680-001).

Subtask 38-31-00-480-051-A ** ON A/C NOT FOR ALL

F. Installation of the Test Equipment
(1) Install the 98D38308234001 ADAPTER - ALTITUDE PRESSURE SWITCH on the altitude pressure switch 43MG.
(2) Connect the TEST UNIT-STATIC PITOT to the altitude pressure switch-adapter.

Subtask 38-31-00-860-050-A ** ON A/C NOT FOR ALL

G. Simulate the LGCIU 2 in the flight configuration on the CFDS (Ref. AMM TASK 32-69-00-860-001).

Subtask 38-31-00-860-050-C ** ON A/C NOT FOR ALL

G. Preparation for the Test
(1) Make sure that the TOILET page is shown on the CFDS.
(2) Make sure that there is no failure in the fault memory of the CFDS.

4. Procedure
Subtask 38-31-00-710-053-C ** ON A/C NOT FOR ALL

A. Do this test.

NOTE: Make sure that the access panel 172AR is closed or the limit switch 44MG is pushed and hold in during the test.

ACTION	RESULT
1.On the altitude pressure switch 43MG: set the altitude to 15250 ft. (4648.11 m).
2.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 starts to operate. 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.
3.In two lavatories: push the flush switches 51MG at the same time.	In the vacuum toilet system: the vacuum generator 37MG starts to operate. air flows out of the ventilation port of the vacuum generator. approx. 0.2 l (0.05 USgal) of water flows into the toilet bowl of both toilets. the flush valves of the both toilets open and the suction removes the water.
4.In a lavatory: push the flush switch 51MG.	In the vacuum toilet system: the vacuum generator 37MG starts to operate. air flows out of the ventilation port of the vacuum generator. approx. 0.2 l (0.05 USgal) of water flows into the toilet bowl. the toilet flush valve opens and the suction removes the water.
within 10 s after the flush cycle starts, push the flush switch 51MG in the same lavatory again.	the vacuum generator continues to operate (first flush cycle not finished). a second or additional flush cycle does not start. the next flush cycle sequence is prevented for approx. 15 s after the first flush cycle starts.
In a different lavatory: push the flush switch 51MG within these 10 s.	The flush cycle starts immediately.
5.On the altitude pressure switch 43MG: set the altitude to 16000 +700 ft. or -700 ft. (4876.71 +213.36 m or -213.36 m).
6.In one lavatory: push the flush switch 51MG.	In the vacuum toilet system: the vacuum generator 37MG will not operate. approx. 0.2 l (0.05 USgal) of water flows into the toilet bowl. the toilet flush valve opens and the water drains out of the toilet bowl.
7.On the altitude pressure switch 43MG: set the altitude to 12000 ft. (3657.53 m).
8.In a different lavatory: push the flush switch 51MG.	In the vacuum toilet system: the vacuum generator 37MG starts to operate. 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.

Subtask 38-31-00-710-053-E ** ON A/C NOT FOR ALL

A. Operational Test
(1) On the MCDU make sure that there are no fault messages:
(a) Get access to the CIDS X - TOILET SYS STATUS page on the MCDU.

CIDS Toilet SYS Status ** ON A/C NOT FOR ALL

(b) Make sure that the configuration of the vacuum system is as shown on the CIDS X - TOILET SYS STATUS page.

NOTE: Make sure that access panel 172AR is closed or push and hold limit switch 44MG during the test.

ACTION	RESULT
1.In all lavatories: Push each flush switch 51MG with a time delay of 15 +/-3 seconds.	In the vacuum toilet system: The VACU GENERATOR on the CIDS X - TOILET SYS page shows "ENABLE". DELTA P on the CIDS X - TOILET SYS page shows "LO". Vacuum generator 37MG starts to operate each time when the flush switch is pressed. Approximately 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 flush switches 51MG within 7 seconds.	In the vacuum toilet system: Vacuum generator 37MG starts to operate. Approximately 0.2 l (0.05 USgal) of water flows into one toilet bowl. Air flows out of the ventilation port of the vacuum generator. The toilet flush valve (of the same toilet) opens and the suction removes the water.
3.In a lavatory: Operate flush switch 51MG while the waste service panel is open and limit switch 44MG not pressed.	In the vacuum toilet system and on the MCDU: The Waste SVCE PNL DOOR on the CIDS X - TOILET SYS page shows "OPEN". The VACU GENERATOR on the CIDS X - TOILET SYS page shows "DISABLE". The vacuum generator does not operate. The flush does not occur. On the FAP the message VACUUM SYSTEM DISABLED-GROUND SERVICING is shown.
4.Make sure that access panel 172AR is closed or push and hold limit switch 44MG during the next tests.	In the vacuum toilet system and on the MCDU: The Waste SVCE PNL DOOR on the CIDS X - TOILET SYS page shows "CLOSED". The VACU GENERATOR on the CIDS X - TOILET SYS page shows "ENABLED".
	On the FAP: The message VACUUM SYSTEM DISABLED-GROUND SERVICING goes out of view.
5.At circuit breaker panel 2000VU or 2001VU: Pull one circuit breaker of the LAVATORY POWER.	The FCU of that toilet is without electrical power.
6.In the lavatory: Push the flush switch of this toilet.	In vacuum system: A flush does not occur. The vacuum generator remains switched off.
	On the FAP: The message CHECK LAVATORY-POWERSUPPLY: LAV XX shows on the toilet page.
7.In a different lavatory: Push flush switch 51MG.	In the vacuum toilet system: Vacuum generator 37MG operates. Approximately 0.2 l (0.05 USgal) of water flows into the toilet bowl. The message CHECK LAVATORY-POWER SUPPLY: LAV XX shows on the toilet page.
8.At circuit breaker panel 2000VU or 2001VU: Push the applicable circuit breaker of the LAVATORY POWER.	On the FAP: The message CHECK LAVATORY-POWER SUPPLY: LAV XX goes out of view.

5. Close-up
Subtask 38-31-00-080-051-A ** ON A/C NOT FOR ALL

A. Removal of the Test Equipment
(1) Bring the pressure on the altitude pressure switch 43MG back to ground level.
(2) Remove the pitot static tester and the adapter from the altitude pressure switch 43MG.

Subtask 38-31-00-860-051-A

B. Push the MCDU MENU mode key on the MCDU to return the system to the menu mode.

Subtask 38-31-00-613-060-A

C. Servicing of the Toilet System
(1) Do the servicing of the toilet system (Ref. AMM TASK 12-16-38-613-001).

Subtask 38-31-00-410-051-A ** ON A/C NOT FOR ALL

D. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access panels 312AR 172AR.
(3) Remove the access platform(s).

Subtask 38-31-00-410-051-C ** ON A/C NOT FOR ALL

D. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access panels 172AR.
(3) Remove the access platform(s).

Subtask 38-31-00-862-052-A

E. Put the aircraft back to its initial configuration.
(1) De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

[Rev.10 from 2021] 2026.04.01 01:19:42 UTC