Operational Test of the Anti-Syphon Valve

TASK 38-31-00-710-005-A
Operational Test of the Anti-Syphon Valve

ZONE: 200

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
200	UPPER HALF FUSELAGE

B. 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 38-31-56-000-001-A	Removal of the Anti-Syphon Valve
TASK 38-31-56-400-001-A	Installation of the Anti-Syphon Valve
Antisyphon Valve ** ON A/C NOT FOR ALL
Anti-Syphon Valve ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 38-31-00-861-056-A

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

Subtask 38-31-00-010-059-A ** ON A/C NOT FOR ALL

B. Get Access

Antisyphon Valve ** ON A/C NOT FOR ALL

(1) Get access to the cabin.
(2) Open the applicable lavatory door.
(3) Remove the toilet shroud.
(a) Remove the screws (1).
(b) Remove the shroud (2).

Subtask 38-31-00-010-059-C ** ON A/C NOT FOR ALL

B. Get Access
(1) Get access to the cabin.
(2) Open the related lavatory door.
(3) Remove the toilet shroud (Ref. AMM TASK 25-45-22-000-001) (Ref. AMM TASK 25-45-22-000-802).

Subtask 38-31-00-614-050-A

C. Pressurize the potable water system (Ref. AMM TASK 38-10-00-614-001) or (Ref. AMM TASK 38-10-00-614-003).

4. Procedure
Subtask 38-31-00-710-056-A

A. Do the Test
(1) Operate the toilet flush switch.
(2) Make sure that the toilet flushes satisfactorily.

Subtask 38-31-00-790-050-A

B. Examine the anti-syphon valve for leaks. If leaks are found, remove and replace the anti-syphon valve (Ref. AMM TASK 38-31-56-000-001) and (Ref. AMM TASK 38-31-56-400-001).

5. Close-up
Subtask 38-31-00-614-051-A

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

Subtask 38-31-00-410-061-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the toilet shroud.
(a) Put the shroud (2) in position.
(b) Install the screws (1).
(3) Close the lavatory door.

Subtask 38-31-00-410-061-C ** ON A/C NOT FOR ALL

B. 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 related lavatory door.

Subtask 38-31-00-862-056-A

C. De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

[Rev.10 from 2021] 2026.04.01 01:19:45 UTC