Removal of the Anti-Syphon Valve

TASK 38-31-56-000-001-A
Removal of the Anti-Syphon Valve

WARNING: DO NOT DO WORK ON THE TOILET WASTE SYSTEM AND THE POTABLE WATER SYSTEM AT THE SAME TIME. THIS WILL PREVENT CONTAMINATION OF THE POTABLE WATER SYSTEM. SUCH CONTAMINATION CAN BE DANGEROUS TO HEALTH.

WARNING: ALWAYS USE RUBBER GLOVES WHEN YOU DO WORK:

ON THE TOILET WASTE SYSTEM, OR
ON PARTS THAT HAVE CONTAMINATION FROM THE WASTE SYSTEM.

WHEN YOU COMPLETE THE WORK PROCEDURE, CLEAN YOUR HANDS WITH SOAP AND WATER. THIS WILL PREVENT INFECTION (TOILET WASTE IS DANGEROUS FOR HEALTH).

WARNING: WHEN YOU REMOVE A COMPONENT OF THE TOILET WASTE SYSTEM, ALWAYS DISINFECT THE PART BEFORE YOU PUT IT IN A PLASTIC BAG, THEN SEAL THE BAG. DO NOT PUT DOCUMENTS INTO THE PLASTIC BAG. SEAL THE BAG FIRST,THEN ATTACH THE DOCUMENTS TO IT. THIS WILL PREVENT INFECTION OR ILLNESS. CONTAMINATION FROM THE WASTE CAN BE DANGEROUS TO HEALTH.

ZONE: 200

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	COVER - BLANKING
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
200	UPPER HALF FUSELAGE

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 25-45-22-000-001-A	Removal of the Toilet Shroud and the Seat
TASK 25-45-22-000-802-A	Removal of the Toilet Shroud of the Space Flex Lavatory
TASK 38-10-00-614-002-A	Depressurization of the Potable Water System
TASK 38-30-00-510-001-A	Decontamination of Components of the Waste/Water and Toilet System for Shipping and/or Installation
Anti-Syphon Valve ** ON A/C NOT FOR ALL
Anti-Syphon Valve ** ON A/C NOT FOR ALL
Anti-Syphon Valve ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 38-31-56-861-050-A

A. Aircraft Maintenance Configuration
(1) Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).

Subtask 38-31-56-865-062-A

B. Open, safety and tag this(these) circuit breaker(s):

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 38-31-56-010-051-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Open the lavatory door.
(2) Remove the toilet shroud (Ref. AMM TASK 25-45-22-000-001).
(3) Make sure that the potable water system is depressurized (Ref. AMM TASK 38-10-00-614-002).

Subtask 38-31-56-010-051-I ** ON A/C NOT FOR ALL

C. Get Access
(1) Open the lavatory door.
(2) Remove the toilet shroud (Ref. AMM TASK 25-45-22-000-001) (Ref. AMM TASK 25-45-22-000-802).
(3) Make sure that you do the depressurization of the potable water system (Ref. AMM TASK 38-10-00-614-002).

4. Procedure
Subtask 38-31-56-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the Anti-Syphon Valve
(1) Close the potable-water shutoff valve (5).
(2) Put the WARNING NOTICE(S) in position to tell persons not to open the potable-water shutoff valve (5).
(3) Put a COVER - BLANKING in the suction port of the toilet bowl.
(4) Remove the coupling clamp (7).
(5) Remove the sleeve (8).
(6) Remove and discard the O-rings (6).
(7) Remove the nuts (3) and the washers (2).
(8) Remove the anti-syphon valve (4).
(9) Remove and discard the O-ring (1).
(10) Put the PLUG-BLANKING in each disconnected line end.
(11) If you use the removed parts again, clean and disinfect them (Ref. AMM TASK 38-30-00-510-001).

Subtask 38-31-56-020-050-C ** ON A/C NOT FOR ALL

A. Removal of the Anti-Syphon Valve
(1) Close the potable-water shutoff valve (4).
(2) Put the WARNING NOTICE(S) in position to tell persons not to open the potable-water shutoff valve (4).
(3) Put a COVER - BLANKING in the suction port of the toilet bowl.
(4) Remove the nuts (3) and the washers (2).
(5) Remove the anti-syphon valve (1).
(6) Remove and discard the O-ring (5).
(7) Put the PLUG-BLANKING in each disconnected line end.
(8) If you use the removed parts again, clean and disinfect them (Ref. AMM TASK 38-30-00-510-001).

Subtask 38-31-56-020-050-I ** ON A/C NOT FOR ALL

A. Removal of the Anti-Syphon Valve
(1) Close the potable-water shutoff valve (3).
(2) Put the WARNING NOTICE(S) in position to tell persons not to open the potable-water shutoff valve (3).
(3) Put the COVER - BLANKING in the suction port of the toilet bowl.
(4) Push the fitting (7) and disconnect the tube (2) from the anti-syphon valve (4).
(5) Unlock the quick-release clamp (8) and remove it from the anti-syphon valve (4).
(6) Remove the nuts (10), the screws (6) and the washers (5).
(7) Remove the packing (11) and discard it.
(8) Remove the anti-syphon valve (4).
(9) Remove the packing (9) and discard it.
(10) Put the PLUG-BLANKING in each disconnected line end.
(11) If you use the removed parts again, clean them with disinfectant (Ref. AMM TASK 38-30-00-510-001).

[Rev.10 from 2021] 2026.04.01 01:20:33 UTC