Installation of the Drain Valve

TASK 38-14-41-400-002-A
Installation of the Drain Valve

WARNING: MAKE SURE THAT THE WATER TANK IS DEPRESSURIZED.

FIN: 4MP

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	ACCESS PLATFORM 2M (6 FT)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
131HW, 825

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
9	PIN	AIPC 38-14-48-01-040

D. Referenced Information

REFERENCE	DESIGNATION
TASK 12-15-38-613-001-A	Fill the Potable Water Tank System (Aircraft Electrical Power Available)
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 20-23-38-400-003-A	Installation of the Tube Assembly of the Potable Water and the associated Air Supply System
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
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 25-54-12-000-003-A	Removal of the Sidewall Panels in the Forward Cargo Compartment
TASK 25-54-12-400-003-A	Installation of the Sidewall Panels in the Forward Cargo Compartment
TASK 38-14-00-710-001-A	Operational Test of the Potable Water Drain-System
TASK 52-30-00-860-001-A	Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
TASK 52-30-00-860-002-A	Close 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
Drain Valve

3. Job Set-up
Subtask 38-14-41-860-051-A

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 potable water tank and potable water lines (Ref. AMM TASK 12-24-38-680-001) or (Ref. AMM TASK 12-24-38-680-002) are drained.

Subtask 38-14-41-010-056-A

B. Get Access
(1) Make sure that the ACCESS PLATFORM 2M (6 FT) is in position at forward cargo-compartment door 825.
(2) Make sure that forward cargo-compartment door 825 (Ref. AMM TASK 52-30-00-860-001) or (Ref. AMM TASK 52-30-00-860-003) is open.
(3) Make sure that cargo-compartment light switch 6LU is in ON position.
(4) Make sure that sidewall panel 131HW is removed in the forward cargo compartment (Ref. AMM TASK 25-54-12-000-003).
(5) Make sure that the insulation blanket is removed from drain valve [4MP] .

Subtask 38-14-41-865-054-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
124VU	SVCE/601PP/602PP/SPLY	1PX	BB01

4. Procedure
Subtask 38-14-41-420-051-A

A. Installation of the Drain Valve Assembly
(1) Put the drain valve assembly (3) in position on the support (8).
(2) Make sure that the lever of the drain valve assembly (3) is in the SHUT position.

CAUTION: MAKE SURE THAT THE BONDING STRAP(S) IS(ARE) CONNECTED BEFORE YOU CONNECT THE ELECTRICAL WIRE(S).

(3) Put the bonding strap (6) in position.
(4) Install the spacers (5), the washers (2) and the screws (1).
(5) Prevent the bonding (Ref. AMM TASK 20-28-00-912-802).
(6) Tighten the screws (1).
(7) Connect the linkage (12) to the drain valve assembly (3).
(8) Install the pin (11), the washer (10) and the new AIPC 38-14-48-01-040 PIN (9).
(9) Remove the PLUG-BLANKING from each disconnected line end.
(10) Connect the pipe (4) to the drain valve assembly (3).
(11) Connect the tee (13) to the drain valve assembly (3). (Ref. AMM TASK 20-23-38-400-003).
(12) Remove the CAP-BLANKING from each electrical connector and receptacle.

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTORS ARE CLEAN BEFORE YOU DISCONNECT OR CONNECT THEM. CONTAMINATION ON THE ELECTRICAL CONNECTORS CAN CAUSE DAMAGE TO EQUIPMENT.

(13) Connect the electrical connector (7) to the drain valve assembly (3).

5. Close-up
Subtask 38-14-41-865-055-A

A. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
124VU	SVCE/601PP/602PP/SPLY	1PX	BB01

Subtask 38-14-41-613-053-A

B. Fill the potable water tank (Ref. AMM TASK 12-15-38-613-001).

Subtask 38-14-41-710-051-A

C. Do the operational test of the Drain Valve (4MP) (Ref. AMM TASK 38-14-00-710-001).

Subtask 38-14-41-410-052-A

D. Close Access
(1) Install the insulation blanket on drain valve [4MP] .
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Install sidewall panel 131HW (Ref. AMM TASK 25-54-12-400-003).
(4) Set cargo-compartment light switch 6LU to OFF position.
(5) Close forward cargo-compartment door 825 (Ref. AMM TASK 52-30-00-860-002) or (Ref. AMM TASK 52-30-00-860-003).
(6) Remove the access platform(s).

Subtask 38-14-41-862-051-A

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

[Rev.10 from 2021] 2026.04.02 06:25:43 UTC