Removal of the Water Valve

TASK 38-31-55-000-001-A
Removal of the Water 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.

NOTE: The procedure for the removal of all the water valves is the same.

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	AR	CAP - BLANKING
No specific	1	COVER - BLANKING
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
No specific	1	WRENCH - OPEN END

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
TASK 38-31-56-000-001-A	Removal of the Anti-Syphon Valve
Valve - Water ** ON A/C NOT FOR ALL
Valve - Water ** ON A/C NOT FOR ALL
Valve - Water ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 38-31-55-861-050-A

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

Subtask 38-31-55-865-062-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 38-31-55-010-051-A ** ON A/C NOT FOR ALL

C. Get Access

Valve - Water ** ON A/C NOT FOR ALL

(1) Make sure that the potable water system is depressurized (Ref. AMM TASK 38-10-00-614-002).
(2) Open the lavatory door.
(3) Remove the toilet shroud (Ref. AMM TASK 25-45-22-000-001).
(4) Close the potable-water shutoff valve (7).
(5) Put the WARNING NOTICE(S) in position to tell persons not to open the potable-water shutoff valve (7).

Subtask 38-31-55-010-051-C ** ON A/C NOT FOR ALL

C. Get Access

Valve - Water ** ON A/C NOT FOR ALL

(1) Make sure that the potable water system is depressurized (Ref. AMM TASK 38-10-00-614-002).
(2) Open the lavatory door.
(3) Remove the toilet shroud (Ref. AMM TASK 25-45-22-000-001) (Ref. AMM TASK 25-45-22-000-802).
(4) Close the potable-water shutoff valve (3).
(5) Put the WARNING NOTICE(S) in position to tell persons not to open the potable-water shutoff valve (3).

Subtask 38-31-55-010-051-J ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 38-31-55-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the Water Valve
(1) Put the COVER - BLANKING in the suction port of the toilet bowl.

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTORS ARE CLEAN BEFORE YOU DISCONNECT OR CONNECT THEM. CONTAMINATION ON THE ELECTRICAL CONNECTORS CAN CAUSE DAMAGE TO EQUIPMENT.

(2) Disconnect the electrical connector (5).
(3) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(4) Remove the clamp (10).
(5) Remove the sleeve (9).
(6) Remove the packings (8) and discard them.
(7) Put the PLUG-BLANKING in each disconnected line end.

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

(8) Remove the lockwire from the water valve (1) and discard it.
(9) Cut and discard the tie wrap (6).
(10) Remove the water valve (1) and retain the spacer (2).
(11) Remove the packing (3) and discard it.
(12) Put the PLUG-BLANKING in each disconnected line end.
(13) If you use the removed parts again, clean and disinfect them (Ref. AMM TASK 38-30-00-510-001).

Subtask 38-31-55-020-050-C ** ON A/C NOT FOR ALL

A. Removal of the Water Valve
(1) Put the COVER - BLANKING in the suction port of the toilet bowl.
(2) Cut the cable-tie (10) that holds the connector cable and discard it.
(3) Remove the rubber (11) from the connector cable.

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTORS ARE CLEAN BEFORE YOU DISCONNECT OR CONNECT THEM. CONTAMINATION ON THE ELECTRICAL CONNECTORS CAN CAUSE DAMAGE TO EQUIPMENT.

(4) Disconnect the electrical connector (1).
(5) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(6) Remove the anti-syphon valve (Ref. AMM TASK 38-31-56-000-001).
(7) Remove the nut (9), the washer (8) and the bolt (12).
(8) Open the retainer (13).

CAUTION: USE TWO WRENCHES TO REMOVE OR INSTALL THE TUBE COUPLING NUTS:

ONE WRENCH TO HOLD THE UNION, AND
ONE TO LOOSEN OR TIGHTEN THE COUPLING NUT.

THIS PREVENTS DAMAGE TO THE PARTS.

(9) Use the WRENCH - OPEN END and disconnect the water line (2) from the water valve (6).
(10) Remove the water valve (6).
(11) Remove and discard the packing (7).
(12) Remove the water valve screen (4) from the water valve (6).
(13) Remove and discard the packing (5).
(14) Put the PLUG-BLANKING in each disconnected line end.
(15) If you use removed parts again, clean them with disinfectant (Ref. AMM TASK 38-30-00-510-001).

Subtask 38-31-55-020-050-I ** ON A/C NOT FOR ALL

A. Removal of the Water Valve
(1) Close the potable-water shutoff valve (1).
(2) Put the WARNING NOTICE(S) in position to tell persons not to open the potable-water shutoff valve (1).

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTORS ARE CLEAN BEFORE YOU DISCONNECT OR CONNECT THEM. CONTAMINATION ON THE ELECTRICAL CONNECTORS CAN CAUSE DAMAGE TO EQUIPMENT.

(3) Disconnect the electrical connector (8) from the flush valve assembly (2).
(4) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(5) Remove the anti-syphon valve (Ref. AMM TASK 38-31-56-000-001).

CAUTION: USE TWO WRENCHES TO REMOVE OR INSTALL THE TUBE COUPLING NUTS:

ONE WRENCH TO HOLD THE UNION, AND
ONE TO LOOSEN OR TIGHTEN THE COUPLING NUT.

THIS PREVENTS DAMAGE TO THE PARTS.

(6) Use the WRENCH - OPEN END and disconnect the water line (14) from the adapter (13).
(7) Unlock and remove the quick-release clamp (11) from the water valve (15).
(8) Remove the adapter (13), packing (12), water valve screen (10) and packing (9) from the water valve (15).
(9) Discard the packings (12) and (9).
(10) Put the PLUG-BLANKING in each disconnected line end.
(11) Unlock and remove the quick-release clamp (4) from the water valve (15).
(12) Remove the tube (3) and the packing (5) from the water valve (15).
(13) Discard the packing (5).
(14) Put the PLUG-BLANKING in each disconnected line end.
(15) Move the cam lever (7) up and turn it 90 degrees.
(16) Disengage the quarter turn cam-fastener (6).
(17) Remove the water valve (15).
(18) Put the PLUG-BLANKING in each disconnected line end.
(19) 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 01:20:29 UTC