Replacement of the Packings of the Waste Drain Valve

TASK 38-31-72-960-001-A
Replacement of the Packings of the Waste Drain Valve

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).

CAUTION: MAKE SURE THAT THE INSULATION DOES NOT STOP THE OPERATION OF THE VALVE.

FIN: 3345MM

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	ACCESS PLATFORM 2M (6 FT)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03FAB1)	Mineral Oil base Grease-- Vaseline or Petrolatum -
(Material No.11GCA1)	Deodorant-Aircraft Toilets - -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
172AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
4	PACKING	AIPC 38-31-72-01-090
2	PACKING	AIPC 38-31-72-01-160

E. Referenced Information

REFERENCE	DESIGNATION
TASK 12-16-38-613-001-A	Servicing of the Toilet System
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 38-31-00-680-001-A	Draining of the Toilet System
Waste Drain Valve 3345MM ** ON A/C NOT FOR ALL
Waste Drain Valve 3345MM ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 38-31-72-861-052-A

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

Subtask 38-31-72-010-052-A

B. Get Access
(1) Put the ACCESS PLATFORM 2M (6 FT) in position at the waste service panel 172AR.
(2) Open the waste service panel 172AR.
(3) Open the waste outlet cover.

Subtask 38-31-72-860-051-A

C. Aircraft Maintenance Configuration
(1) Drain and flush the waste holding tank (Ref. AMM TASK 38-31-00-680-001).
(2) Disinfect the Toilet System
(a) Put 2 l (0.5283 USgal) of Deodorant-Aircraft Toilets - - (Material No.11GCA1) in each toilet bowl and flush them through.
(3) Remove the drain hose which you used for for the draining procedure.

4. Procedure
Subtask 38-31-72-960-050-A

A. Replacement of the Packings
(1) Remove the packings (2) and (4) as follows:
(a) Remove the packing (2) from the inner flap (1) and discard it.
(b) Remove the packing (4) from the cap (3) and discard it.
(c) Clean the inner flap (1) and the cap (3) with Textile-Lint free Cotton - (Material No.14SBA1) .
(2) Install the packings (2) and (4) as follows:
(a) Apply a thin layer of Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) on a new AIPC 38-31-72-01-160 PACKING (2) and install it on the inner flap (1).
(b) Apply a thin layer of Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) on a new AIPC 38-31-72-01-090 PACKING (4) and install it on the cap (3).

Subtask 38-31-72-790-050-A

B. Do this Leak Test
(1) Make sure that the inner flap is closed.
(2) Set the drain lever 3341MM to the DRAIN position.
(3) Fill the waste tank with approximately 10 l (2.6417 USgal) of water.
(4) Examine the inner flap and make sure there are no leaks.
(5) Leaks are not permitted.

Subtask 38-31-72-680-052-A

C. Drain the waste holding tank (Ref. AMM TASK 38-31-00-680-001)

5. Close-up
Subtask 38-31-72-613-051-A

A. Service the waste holding tank 3300MM (Ref. AMM TASK 12-16-38-613-001).

Subtask 38-31-72-410-051-A

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the access platform(s).

Subtask 38-31-72-862-051-A

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

[Rev.10 from 2021] 2026.04.01 01:21:03 UTC