Installation of the Anti-Syphon Valve

TASK 38-31-56-400-001-A
Installation 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: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

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	Torque wrench: range to between 35 and 25 lbf.in (0.40 and 0.28 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03FAB1)	Mineral Oil base Grease-- Vaseline or Petrolatum -
(Material No.03HCA4)	Synthetic Ester base Grease-O-ring - -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
200	UPPER HALF FUSELAGE

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
11	PACKING	AIPC 38-31-41-30-120
9	PACKING	AIPC 38-31-41-30-140
5	O-RING	AIPC 38-31-41-40-040
1	O-RING	AIPC 38-31-41-40-060
6	O-RINGS	AIPC 38-31-41-40-090

E. Referenced Information

REFERENCE	DESIGNATION
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 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 25-45-22-400-001-A	Installation of the Toilet Shroud and the Seat
TASK 25-45-22-400-802-A	Installation of the Toilet Shroud of the Space Flex Lavatory
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
TASK 38-10-00-614-003-A	Pressurization of the Potable Water System with the Compressor
TASK 38-10-00-670-002-A	Disinfection of Potable Water System and Discard of Water Filter Elements, if Installed
TASK 38-31-00-710-009-A	Operational Test of the Toilet Unit
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
Clamp Installation Requirements ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 38-31-56-860-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the ground service network is energized
(Ref. AMM TASK 24-42-00-861-001).
(2) Make sure that the lavatory door is open.
(3) Make sure that the toilet shroud is removed (Ref. AMM TASK 25-45-22-000-001).
(4) Make sure that the potable water system is depressurized (Ref. AMM TASK 38-10-00-614-002).

Subtask 38-31-56-860-050-D ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the ground service network is energized
(Ref. AMM TASK 24-42-00-861-001).
(2) Make sure that the lavatory door is open.
(3) Make sure that the toilet shroud is removed (Ref. AMM TASK 25-45-22-000-001) (Ref. AMM TASK 25-45-22-000-802).
(4) Make sure that the potable water system is depressurized (Ref. AMM TASK 38-10-00-614-002).

Subtask 38-31-56-865-063-A

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

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

4. Procedure
Subtask 38-31-56-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the Anti-Syphon Valve

Clamp Installation Requirements ** ON A/C NOT FOR ALL

(1) Make sure that the potable-water shutoff valve (5) is closed.
(2) Make sure that the WARNING NOTICE(S) are in position to tell persons not to open the potable-water shutoff valve (5).
(3) Make sure that the COVER - BLANKING is in the suction port of the toilet bowl.
(4) Remove the PLUG-BLANKING from each disconnected line end.
(5) Apply Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) to the new AIPC 38-31-41-40-060 O-RING (1) and AIPC 38-31-41-40-090 O-RINGS (6) and install them.
(6) Put the anti-syphon valve (4) in position.
(7) Install the washers (2) and the nuts (3).
(8) Install the sleeve (8) and the coupling clamp (7).
(9) Make sure that the coupling clamp (7) is locked correctly:

axial adjustment is more than 6.35mm
angular misalignment is +/- 4 degree in all the direction around centerline.

(10) Remove the COVER - BLANKING from the suction port of the toilet bowl.
(11) Remove the WARNING NOTICE(S) related to the potable-water shutoff valve (5).
(12) Open the potable-water shutoff valve (5).

Subtask 38-31-56-420-050-C ** ON A/C NOT FOR ALL

A. Installation of the Anti-Syphon Valve
(1) Make sure that the potable-water shutoff valve (4) is closed.
(2) Make sure that the WARNING NOTICE(S) are in position to tell persons not to open the potable-water shutoff valve (4).
(3) Make sure that the COVER - BLANKING is in the suction port of the toilet bowl.
(4) Remove the PLUG-BLANKING from each disconnected line end.
(5) Apply Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) to the new AIPC 38-31-41-40-040 O-RING (5) and install it.
(6) Put the anti-syphon valve (1) in the installation position.
(7) Install the washers (2) and the nuts (3).
(8) Remove the COVER - BLANKING from the suction port of the toilet bowl.
(9) Remove the WARNING NOTICE(S) related to the potable-water shutoff valve (4).
(10) Open the potable-water shutoff valve (4).

Subtask 38-31-56-420-050-I ** ON A/C NOT FOR ALL

A. Installation of the Anti-Syphon Valve
(1) Make sure that the potable-water shutoff valve (3) is closed.
(2) Make sure that the WARNING NOTICE(S) is (are) in position to tell persons not to open the potable-water shutoff valve (3).
(3) Make sure that the COVER - BLANKING is in the suction port of the toilet bowl.
(4) Remove the PLUG-BLANKING from each disconnected line end.
(5) Apply a thin layer of Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) or Synthetic Ester base Grease-O-ring - - (Material No.03HCA4) to the new AIPC 38-31-41-30-140 PACKING (9).
(6) Put the packing (9) in its correct installation position.
(7) Put the anti-syphon valve (4) in its correct installation position.
(8) Apply a thin layer of Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) or Synthetic Ester base Grease-O-ring - - (Material No.03HCA4) to the new AIPC 38-31-41-30-120 PACKING (11).
(9) Put the packing (11) in position between the outlet of the anti-syphon valve (4) and the inlet of the flush ring (1).
(10) Install the washers (5), the screws (6) and the nuts (10).
(11) TORQUE the screws (6) to between 35 and 25 lbf.in (0.40 and 0.28 m.daN )

.
(12) Install the quick-release clamp (8) and lock it.
(13) Make sure that the quick-release clamp (8) is locked correctly.
(14) Push the fitting (7) and connect the tube (2) to the anti-syphon valve (4).
(15) Remove the COVER - BLANKING from the suction port of the toilet bowl.
(16) Remove the WARNING NOTICE(S) related to the potable-water shutoff valve (3).
(17) Open the potable-water shutoff valve (3).

Subtask 38-31-56-865-064-A

B. Remove the safety clip(s) and the tag(s) and close 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 38-31-56-790-050-A

C. Leak Test
(1) Pressurize the potable water system (Ref. AMM TASK 38-10-00-614-001) or (Ref. AMM TASK 38-10-00-614-003).
(2) Operate the toilet and make sure that it flushes correctly (Ref. AMM TASK 38-31-00-710-009).
(3) Make sure that the anti-syphon valve does not leak.

Subtask 38-31-56-670-050-A

D. Disinfection of the Potable Water System
(1) Do the disinfection of the potable water system (Ref. AMM TASK 38-10-00-670-002).

5. Close-up
Subtask 38-31-56-410-050-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the toilet shroud (Ref. AMM TASK 25-45-22-400-001).
(3) Close the lavatory door.
(4) Put the system back to the serviceable condition.

Subtask 38-31-56-410-050-C ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the toilet shroud (Ref. AMM TASK 25-45-22-400-001) (Ref. AMM TASK 25-45-22-400-802).
(3) Close the lavatory door.
(4) Put the system back to the serviceable condition.

Subtask 38-31-56-862-050-A

B. 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 01:20:34 UTC