NOTE : Air will flow from the overflow port. If there is water in the
____ system, water will flow from the fill port.
 NOTE : When the pressure in the potable water system decreases, the
____ reducing valve starts the air supply to the system again.
 (5)
 Make sure that the pressure at the manometer shows between 22 psi (1.5168 bar) and 25 psi (1.7236 bar).

 (6)
 If necessary, do the procedure again until the pressure is correct NOTE : It is not necessary to adjust the relief pressure of the valve

____ after you adjust the reducing pressure.
 (7) Close the ground air supply.
 **ON A/C ALL

 Subtask 38-41-00-710-052
 C. Do the operational test of the pressure reducing and relief valve 4200MM (Ref. TASK 38-41-00-710-001).
 **ON A/C 001-049, 051-099, 101-149, 201-299,
 Subtask 38-41-00-614-052
 D. Move the fill/drain handle from the NORMAL to the FILL position to depressurize the potable water system.

R **ON A/C 151-199, 301-399, 401-499,
 Subtask 38-41-00-614-052-A
 D. Move the fill/drain and overflow handle from the NORMAL to the FILL position to depressurize the potable water system.
 **ON A/C ALL
 5. Close-up
________
 Subtask 38-41-00-080-051

 A. Removal of the Test Equipment
 (1)
 Remove the manometer from the test port and install the blanking plug.

 (2)
 Remove the air supply cart.

 **ON A/C 001-049, 051-099, 101-149, 201-299,
 Subtask 38-41-00-410-053
 B. Close Access
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 Install the access panels 131PW, 131NW.

 (3)
 Close the FWD cargo-compartment door (Ref. TASK 52-30-00-860-002).

 (4)
 Close the access panel 171AL.

 (5) Remove the access platform(s). R **ON A/C 151-199, 301-399, 401-499,
 Subtask 38-41-00-410-053-A
 B. Close Access
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 Install the access panel 161DW.

 (3)
 Close the AFT cargo-compartment door (Ref. TASK 52-30-00-860-002).

 (4)
 Close the access panel 171AL.

 (5) Remove the access platform(s).
 **ON A/C ALL

 Subtask 38-41-00-862-054
 C. De-energize the aircraft electrical circuits
 (Ref. TASK 24-41-00-862-002).

 CHECK VALVE (4205MM) - REMOVAL/INSTALLATION
___________________________________________
 TASK 38-41-41-000-001
 Removal of the Valve 4205MM
 WARNING : MAKE SURE THAT THE PNEUMATIC SYSTEM IS DEPRESSURIZED BEFORE YOU START
_______
 WORK ON THE PNEUMATIC SYSTEM.

 1.
 Reason for the Job

__________________
 Self Explaantory

 2.
 Job Set-up Information

______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------
REFERENCE QTY DESIGNATION
 -------------------------------------------------------------------------------
No specific blanking plugs
 No specific access platform 2 m (6 ft. 7 in.)

 B. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
24-41-00-861-002 Energize the Aircraft Electrical Circuits from the
 External Power 38-10-00-614-002 Depressurization of the Potable Water System 52-30-00-860-001 Open the FWD or AFT Cargo-Compartment Door with the
 Yellow Electric Pump
 **ON A/C 001-049, 051-099, 101-149, 201-299,
 38-41-41-991-001 Fig. 401 R **ON A/C 151-199, 301-399, 401-499,
 38-41-41-991-001-A Fig. 401A **ON A/C ALL

 3. Job Set-up
__________
 Subtask 38-41-41-861-050

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

 Subtask 38-41-41-614-050
 B. Depresurize the potable water system (Ref. TASK 38-10-00-614-002).
 Subtask 38-41-41-941-051

 C. Safety Precautions
 (1) Put warning notices in position to tell persons not to pressurize the potable water system.
 **ON A/C 001-049, 051-099, 101-149, 201-299,
 Subtask 38-41-41-010-050
 D. Get Access
　
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