Removal of the Potable Water Tank

TASK 38-11-41-000-001-A
Removal of the Potable Water Tank

WARNING: YOU MUST MAKE SURE THAT YOU CAN HOLD THE COMPONENT BEFORE YOU REMOVE/INSTALL IT. THE COMPONENT IS HEAVY. IF IT FALLS, IT CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.

CAUTION: WHILE YOU REMOVE OR INSTALL THE WATER TANK, BE CAREFUL NOT TO CAUSE DENTS OR DAMAGE TO IT. DENTS OR DAMAGE CAN CAUSE LEAKAGE IN THE WATER TANK.

NOTE: The weight of this equipment is approximately 16 kg (35 lb). More than one person is necessary for this procedure.

FIN: 3000MM

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)
No specific	AR	CAP - BLANKING
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	SCRAPER - NON METALLIC
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
131NW, 132PW
161DW, 162DW

C. Referenced Information

REFERENCE	DESIGNATION
TASK 12-24-38-680-001-A	Draining of the Potable Water System (with Electrical Power)
TASK 12-24-38-680-002-A	Draining of the Potable Water System (without Electrical Power)
TASK 21-21-41-000-001-A	Removal of the Recirculation Filter Cartridge
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 25-54-12-000-001-A	Removal of the Forward Cargo-Compartment Partition
TASK 25-55-12-000-001-A	Removal of the Aft Cargo-Compartment Partition at FR65
TASK 38-10-00-614-002-A	Depressurization of the Potable Water System
TASK 52-30-00-860-001-A	Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
TASK 52-30-00-860-003-A	Open the FWD or Aft Cargo-Compartment Door with the Hand Pump
TASK 53-43-11-000-001-A	Removal of the Support Strut
Access Panels-Support Struts ** ON A/C NOT FOR ALL
Air Conditioning Ducts ** ON A/C NOT FOR ALL
Pressure Switch 10MD ** ON A/C NOT FOR ALL
Potable Water Tank ** ON A/C NOT FOR ALL
Potable Water Tank ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 38-11-41-861-050-A

A. Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 38-11-41-614-052-A

B. De-pressurize the potable water system (Ref. AMM TASK 38-10-00-614-002).

Subtask 38-11-41-680-051-A ** ON A/C NOT FOR ALL

C. Draining of the Potable Water System
(1) Drain the potable water system (Ref. AMM TASK 12-24-38-680-001).
(2) Do not close the potable water-service panel-door 171AL.
(3) Put a WARNING NOTICE(S) in position to tell the persons not to pressurize or fill the potable water tank.

Subtask 38-11-41-010-050-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Put the ACCESS PLATFORM 2M (6 FT) in position.
(2) Open the AFT cargo-compartment door (Ref. AMM TASK 52-30-00-860-001).
(3) Remove the access panels 161DW 162DW (Ref. AMM TASK 25-55-12-000-001).
(4) Remove the center support strut at FR65 (Ref. AMM TASK 53-43-11-000-001).

Subtask 38-11-41-680-051-B ** ON A/C NOT FOR ALL

E. Draining of the Potable Water System
(1) Drain the potable water system (Ref. AMM TASK 12-24-38-680-001) (Ref. AMM TASK 12-24-38-680-002).
(2) Do not close potable-water service-panel door 171AL.
(3) Examine drain valve 14MP and make sure that it is open.

NOTE: If drain valve 14MP is not open, then you must open it manually.

(4) Put a WARNING NOTICE(S) in position to tell the persons not to pressurize or fill the potable water tank.

Subtask 38-11-41-010-050-B ** ON A/C NOT FOR ALL

F. Get Access

Access Panels-Support Struts ** ON A/C NOT FOR ALL

Air Conditioning Ducts ** ON A/C NOT FOR ALL

(1) Put an ACCESS PLATFORM 2M (6 FT) in position.
(2) Open the forward cargo-compartment door (Ref. AMM TASK 52-30-00-860-001) (Ref. AMM TASK 52-30-00-860-003).
(3) Remove partitions 131NW and 132PW (Ref. AMM TASK 25-54-12-000-001).
(4) Remove the partition panel-support struts (31) and (34):
(a) Remove the sealant from the top and bottom part of the partition panel-support struts (31) and (34) with a SCRAPER - NON METALLIC.
(b) Remove the nuts (33) and the bolts (32) and remove the partition panel-support struts (31) and (34).
(5) Remove [4013HM] (Ref. AMM TASK 21-21-41-000-001).
(6) Remove the air conditioning ducts:
(a) Remove the fwd duct (41).
Detail B and C:
1 Remove the clamps (43) and (45).
2 Remove the bellows (44).
3 Remove the duct (41) from the aircraft.
(b) Remove the bend duct (42).
Detail D, E, F and G:
1 Remove the clamps (50), (52) and (54).
2 Remove the bellows (53) and (55).
3 Remove the duct (42) from the aircraft.
(c) Remove the bracket assembly.
Detail J:
1 Remove the bolts (61) and the washers (60).
2 Remove the bracket assembly from the aircraft.

NOTE: If necessary, loosen the clamps of the cable harness (aft of the bracket assembly) to get easier access to the aft bolts (61).

(d) Remove the rear duct (40).
Detail B and H:
1 Remove the clamps (43), (63) and (64).
2 Remove the bellows (44) and (66).
3 Remove the rear duct (40) from the aircraft.

Subtask 38-11-41-941-052-A

G. Safety Precautions
(1) Put the warning notices in the positions:

In the cockpit on engine control panel 115VU to tell persons not to start the engine(s).
In the cockpit, on the overhead panel, on the AIR COND section of control panel 30VU to tell persons not to push ENG 1 BLEED, ENG 2 BLEED and APU BLEED pushbutton switches to the ON position.
On the HP ground connection to tell persons not to pressurize the pneumatic system.
On potable-water service panel 2023VU to tell persons not to pressurize the potable water system.

Subtask 38-11-41-865-056-A

H. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
2000VU	WATER SYSTEM-DEPRESS	1MD	B02
2000VU	WATER SYSTEM-QANT-IND	1MA	B01
** ON A/C NOT FOR ALL
2001VU	WATER-SYSTEM-DEPRESS	1MD	F03
** ON A/C NOT FOR ALL
2001VU	WATER SYS-QUANT-IND	1MA	B06
** ON A/C NOT FOR ALL
2001VU	WATER SYS-AIR-COMPRESSOR	19MD	F01
** ON A/C NOT FOR ALL
2001VU	WATER-SYSTEM-DEPRESS	1MD	D05

4. Procedure
Subtask 38-11-41-560-052-C ** ON A/C NOT FOR ALL

A. Disconnection of the Pressure Switch 10MD

Pressure Switch 10MD ** ON A/C NOT FOR ALL

(1) Disconnect the electrical connector 10MD-A (2) from the pressure switch 10MD (1).
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.

Subtask 38-11-41-020-051-B ** ON A/C NOT FOR ALL

WARNING: MAKE SURE THAT THE POTABLE WATER SYSTEM IS DEPRESSURIZED. A PRESSURIZED SYSTEM CAN CAUSE INJURY TO PERSONS WHEN THEY DO WORK ON IT.

B. Removal of the Potable Water Tank

Potable Water Tank ** ON A/C NOT FOR ALL

(1) Disconnect the air pressure line (16).
(2) Disconnect the connection (15) at the tank.
(3) Disconnect the connection (13).
(4) Remove the clamps (20) and the overflow line (14).
(5) Disconnect the electrical connector 3MA-A (17) from the quantity transmitter 3MA.
(6) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(7) Disconnect the connection (8).
(8) Put the PLUG-BLANKING in each disconnected line end.
(9) Pull the distribution line assembly (7) out of the water tank (1).
(10) Remove and discard the cotter pin (11).
(11) Remove the washer (10) and the pin (9).
(12) Remove the clamps (2).
(13) Remove the potable water tank 3000MM (1).

NOTE: Make sure that you do not dent or cause damage to the tank. Dents or damage to the tank could cause a leak to occur.

Subtask 38-11-41-020-051-C ** ON A/C NOT FOR ALL

WARNING: MAKE SURE THAT THE POTABLE WATER SYSTEM IS DEPRESSURIZED. A PRESSURIZED SYSTEM CAN CAUSE INJURY TO PERSONS WHEN THEY DO WORK ON IT.

B. Removal of the Potable Water Tank

Potable Water Tank ** ON A/C NOT FOR ALL

(1) Disconnect the electrical connector 3MA-A from the quantity transmitter 3MA.
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Disconnect the air pressure line (8).
(4) Disconnect the clamshell (6) and move the sleeve (5) back.
(5) Discard the O-rings (4).
(6) Disconnect the clamshell (18) and move the sleeve (17) over the pipe (19).
(7) Pull the distribution line assembly (16) out of the water tank.
(8) Discard the O-rings (15).
(9) Put the PLUG-BLANKING in each disconnected line end.
(10) Loosen the two tank attach clamps (9).
(11) Remove and discard the cotter pin (24).
(12) Remove the washer (25) and the pin (26).
(13) Remove the nuts (21) the washers (22) and the bolts (23).
(14) Remove the brackets (20).
(15) Remove the potable water tank 3000MM (10).

NOTE: Make sure that you do not dent or cause damage to the tank. Dents or damage to the tank could cause a leak to occur.

[Rev.10 from 2021] 2026.04.01 08:24:50 UTC