(2)
 Install the floor-panel 161DW (Ref. TASK 25-55-12-400-001).

 (3)
 In the AFT cargo compartment, on the control panel 5024VE set the light switch 30LU to the OFF position.

 (4)
 Remove the access platform(s).

 (5)
 Close the AFT cargo-compartment door (Ref. TASK 52-30-00-860-002).

 (6)
 Close the access door 171AL. NOTE : Make sure that the latches are correctly locked and that the

____ door makes a continuous surface with the skin of the aircraft.

 (7)
 Remove the access platform(s).

 (8)
 Remove the ground support and maintenance equipment, the special and standard tools and all other items.

 Subtask 38-14-19-862-050
 B. De-energize the ground service network
 (Ref. TASK 24-42-00-862-001).

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 VALVE - DRAIN (4MP) - REMOVAL/INSTALLATION__________________________________________
 TASK 38-14-41-000-002
 Removal of the Drain Valve (4MP)
 WARNING : MAKE SURE THAT THE WATER TANK IS DEPRESSURIZED._______
 1. Reason for the Job__________________
 Self Explanatory
 2. Job Set-up Information______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific No specific No specific No specific  blanking capsblanking plugscircuit breaker(s) safety clip(s)access platform 2 m (6 ft. 7 in.)
 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
R R R R R 12-24-38-680-001 12-24-38-680-002 24-42-00-861-001 52-30-00-860-001 38-14-41-991-002  Draining of the Potable Water System (with Electrical Power) Draining of the Potable Water System (without Electrical Power)Energize the Ground Service Network from the External Power Open the FWD or AFT Cargo-Compartment Door with the Yellow Electric PumpFig. 401
 3. Job Set-up__________
 Subtask 38-14-41-861-051
 A. Energize the ground service network (Ref. TASK 24-42-00-861-001).

 Subtask 38-14-41-613-052 R B. Drain the potable water tank and potable water lines (Ref. TASK 12-24-38-R 680-001) or (Ref. TASK 12-24-38-680-002). Subtask 38-14-41-010-055
 C. Get Access
 (1)
 Put an access platform in position at the FWD cargo-compartment door

 825.

 (2)
 Open the FWD cargo-compartment door 825 (Ref. TASK 52-30-00-860-001).

 (3)
 Set the CARGO COMPT LIGHT switch 6LU to ON position.

 (4)
 In the FWD cargo compartment, remove the sidewall panel 131HW.

 (5) Remove the insulation blanket from the valve (3).
 Subtask 38-14-41-865-053

 D. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
124VU SVCE/601PP/602PP/SPLY 1PX BB01
 4. Procedure
_________
 (Ref. Fig. 401/TASK 38-14-41-991-002)
 Subtask 38-14-41-020-052

 A. Removal of the Drain Valve
 (1)
 Disconnect the electrical connector (5) from the valve (3).

 (2)
 Put blanking caps on the disconnected electrical connectors.

 (3)
 Remove and discard the cotter pin (10) and remove the washer (9).

 (4)
 Remove the pin (7) and disconnect the linkage (8).

 (5)
 Disconnect the hose (11).

 (6)
 Disconnect the pipe (4).

 (7)
 Remove the screws (1) and the washers (2).

 (8)
 Remove the valve (3).

 (9)
 Put blanking plugs on the disconnected line ends.

 Drain Valve (4MP)
 Figure 401/TASK 38-14-41-991-002
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 TASK 38-14-41-400-002

 Installation of the Drain Valve (4MP)
　
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