Removal of the Flush Ring

TASK 38-31-66-000-801-A
Removal of the Flush Ring

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.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

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, PLASTIC
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.11CBA1)	Disinfectant and cleaner-Aircraft general - -
(Material No.11GCA1)	Deodorant-Aircraft Toilets - -

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 38-10-00-614-002-A	Depressurization of the Potable Water System
Flush Ring Assembly ** ON A/C NOT FOR ALL
Flush Ring Assembly ** ON A/C NOT FOR ALL
Flush Ring Assembly ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 38-31-66-861-050-A

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

Subtask 38-31-66-860-051-A

B. Aircraft Maintenance Configuration
(1) Make sure that the water system is depressurized (Ref. AMM TASK 38-10-00-614-002).
(2) Put a WARNING NOTICE(S) in position to tell persons not to pressurize the potable water system.
(3) Close the manual shut-off valve in each lavatory.
(4) Push the flush switch one time in each lavatory to remove the remaining water from the toilet assembly.

Subtask 38-31-66-670-051-A

C. Disinfection of the Toilet Assembly
(1) Spray Disinfectant and cleaner-Aircraft general - - (Material No.11CBA1) into the toilet assembly.
(2) Put 0.25 l (0.1 USgal) of Deodorant-Aircraft Toilets - - (Material No.11GCA1) in the toilet bowl and flush.

Subtask 38-31-66-865-050-A

D. 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 38-31-66-010-050-A

E. Get Access
(1) Open the applicable lavatory door.
(2) Remove the toilet shroud (Ref. AMM TASK 25-45-22-000-001).

4. Procedure
Subtask 38-31-66-020-050-B ** ON A/C NOT FOR ALL

A. Removal of the Flush Ring Assembly

Flush Ring Assembly ** ON A/C NOT FOR ALL

(1) Push the fitting (14) in and remove the vent tube (2) from the anti-siphon valve (13).
(2) Unlock the clamp (5).
(3) Disengage the quick release fasteners (8).
(4) Disengage the front clip (9).
(5) Lift the flush ring assembly (1) from the pedestal (3).
(6) Remove the clamp (5).
(7) Remove and discard the O-ring (4).
(8) Put a CAP - BLANKING, PLASTIC on all the disconnected line end(s).
(9) Remove the nuts (10), the screws (6) and the washers (7).
(10) Remove the anti-siphon valve (13) from the flush ring (11).
(11) Remove and discard the O-ring (12).
(12) Remove the flush ring (11).
(13) Put a CAP - BLANKING, PLASTIC on all the disconnected end(s) of the anti-siphon valve (13).

Subtask 38-31-66-020-050-C ** ON A/C NOT FOR ALL

A. Removal of the Flush Ring Assembly

Flush Ring Assembly ** ON A/C NOT FOR ALL

(1) Remove the nuts (5), the screws (6) and the washers (7).
(2) Remove the flush ring (1) from the bowl (3).
(3) Remove and discard the O-ring (2).
(4) Put a CAP - BLANKING, PLASTIC on the open end of the anti-siphon valve (4).

Subtask 38-31-66-020-050-D ** ON A/C NOT FOR ALL

A. Removal of the Flush Ring Assembly

Flush Ring Assembly ** ON A/C NOT FOR ALL

(1) For Configuration 1:
(a) Remove the nuts (5), the washers (4) and the bolts (6).
(b) Remove the flush ring (7) from the bowl (3).
(c) Remove and discard the O-ring (1).
(d) Put a CAP - BLANKING, PLASTIC on the open end of the anti-siphon valve (2).
(2) For Configuration 2:
(a) Remove the nuts (13), the washers (12) and the bolts (14).
(b) Remove the flush ring (15) from the ball check fitting (9).
(c) Remove the ball check fitting (9).
(d) Remove and discard the O-rings (8).
(e) Remove the flush ring (15) from the bowl (11).
(f) Put a CAP - BLANKING, PLASTIC on the open end of the anti-siphon valve (10).

[Rev.10 from 2021] 2026.04.01 01:20:52 UTC