Ram Air System Turbofan - Servicing
Figure 301

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A 737-300/400/500MAINTENANCE MANUAL
 (4)  S 963-005Replace the oil in the drain sump if there is oil discoloration on the dipstick (AMM 21-52-61/301).
 (5)  S 613-006If the oil level on the dipstick is below the ADD line, add oil to the turbofan as follows: (a) Add oil to the turbofan until the oil level is at the bottom of the overflow holes. (b) After a few minutes, do a check that the oil level is above the ADD mark on the dipstick.
 NOTE:____ It will take a few minutes until the oil flows into the passages of the turbofan and the oil level becomes stable.
 (c) (d)  If the oil level is still not above the ADD mark on the dipstick, do the two previous steps again until the oil level is satisfactory.Install the dipstick.
 (6)  S 413-010Close the access doors to the air conditioning bay.

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737-300/400/500MAINTENANCE MANUAL
 POTABLE WATER SYSTEM - SERVICING
________________________________
 1.  General_______
 A. This procedure has a task to fill the potable water tank.
 TASK 12-14-00-603-017
 2.  Potable Water Tank - Servicing (Fig. 301)______________________________
 A. General
 WARNING: IF THE POTABLE WATER SYSTEM IS NOT DRAINED OR IN NORMAL SERVICE
_______ A MINIMUM OF ONE TIME EACH THREE DAYS, THE GROWTH OF BACTERIA CAN OCCUR. IF BACTERIA GROWTH CONTINUES, AND YOU DRINK THE WATER, ILLNESS CAN OCCUR.
 (1)  The procedure to drain and clean the potable water tank with a disinfectant is in section AMM 38-11-00/301.
FILL VALVE HANDLE
OVERFLOW FITTING FILL FITTING
CAP
AIR VALVE
SEE A TANK DRAIN VALVE HANDLE
DOOR LATCH FWD (3 PLACES)
WATER SERVICE PANEL A Passenger Water Service Panel Figure 301
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737-300/400/500MAINTENANCE MANUAL
 B. References
 (1)  AMM 38-41-00/201, Water Tank Pressurization System
 C. Procedure
 S 413-001
 (1)  
Open the access panel for the potable water service panel.

 S 413-002

 (2)  
Remove the cap for the fill connection.

 S 493-003

 (3)  
Connect the water supply hose to the fill connection at the service panel.

 S 863-004

 (4)  
Turn the handle for the fill valve to the open position.

 NOTE: You will not have sufficient pressure in the
____ pneumatic system with the fill valve in the open position. A fill valve in the open position will not prevent high pressure in the pneumatic system when the tank is full.
 S 613-005
 CAUTION:_______THE WATER PRESSURE MUST NOT BE MORE THAN 55 PSI. IF WATER PRESSURE IS MORE THAN 55 PSI, IT CAN CAUSE DAMAGE TO THE WATER TANK.
 (5)  
Use a pressure of 25-55 psi to fill the tank with water.

 S 863-006

 (6)  
Stop the procedure to fill the water tank when the water flows from the overflow port.

 S 863-007

 (7)  
Turn the handle for the fill valve to the closed position.

 (8)  
Disconnect the water supply hose from the fill connection.

 (9)  
　
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