(3) Operate the water faucet until the flow rate of the water decreases. Subtask 38-41-00-860-050
 C. Preparation for Test
 (1)
 If necessary fill the potable water tank (Ref. TASK 12-15-38-613-001).

 (2)
 Pressurize the aircraft pneumatic system (Ref. TASK 38-10-00-614-001).

 4. Procedure
_________ Subtask 38-41-00-710-051
 A. Do this test.
 -------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
1. In the aircraft pneumatic system: - the pneumatic cross-feed duct is pressurized.  In the potable-water air supply-system:- the shuttle valve 4215M shuts off theground supply port. - the potable water tank 3000MM is pressurized.
 2. In the lavatory: - operate the water faucet.  In the lavatory:- water flows from the hose into the container.
 - the flow rate of the water is normal.

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 5. Close-up
________ Subtask 38-41-00-410-052
 A. Close Access
 (1)
 Depressurize the potable water system (Ref. TASK 38-10-00-614-002).

 (2)
 If necessary fill the potable water tank (Ref. TASK 12-15-38-613-001).

 (3)
 Remove the hose and the container from the lavatory.

 (4)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (5)
 Remove the ground support and maintenance equipment, the special and standard tools and all other items.

 Subtask 38-41-00-862-053
 B. De-energize the aircraft electrical circuits
 (Ref. TASK 24-41-00-862-002).

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 TASK 38-41-00-790-001 Leak Check of the Components in the Air Supply System
 1.
 Reason for the Job

__________________
 Self Explanatory

 2.
 Job Set-up Information

______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific ground air-supply cart
 No specific access platform 1.0 m (3 ft. 3 in.)

 B. Consumable Materials
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
No specific soap solution
 3. Job Set-up
__________ Subtask 38-41-00-941-053
 A. Put the access platform in position at Zone 171. Subtask 38-41-00-010-055
 B. Open the access panel 171AL. Subtask 38-41-00-480-053
 C. Connect the ground air-supply cart to the ground air-pressure port.
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 4. Procedure
_________

 Subtask 38-41-00-790-050
 A. Do the Leak Check
 (1)
 Apply soap solution to the applicable connection(s).

 (2)
 Operate the ground air-supply cart and pressurize the potable water system to 44 +3 -3 psi (3.0336 +0.2068 -0.2068 bar).

 (3)
 Examine the connection(s) for leaks.
 NOTE : Leaks are not permitted.

____

 (4)
 Clean the connection(s).

 (5)
 Release the pressure from the potable water system.

 5. Close-up
________ Subtask 38-41-00-080-052
 A. Disconnect the ground air-supply cart. Subtask 38-41-00-410-056
 B. Close Access
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 Close the potable-water service panel-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.

 (3)
 Remove the access platform(s).

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 TASK 38-41-00-790-002

R Leak Check of the Air supply System
 1. Reason for the Job
__________________
 Self Explanatory
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------
REFERENCE QTY DESIGNATION
 -------------------------------------------------------------------------------
　
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