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 J.  Make sure there is no in-flight ice buildup from the forward toilet service panel. Ice buildup is the result of a leaking service drain valve. If the forward service panel drain valve leaks, and ice buildup occurs around the valve, the release of ice in-flight can cause damage to the wing leading edge, the engine strut, and the engine itself.
 K.  When you add antifreeze, make sure the quantity of chemical precharge and antifreeze is not more than the quantity shown on the service panel.
 NOTE: The total chemical precharge quantity is shown on the service
____ panel placard. The suggested amount is 3 gallons (12 liters).
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A

737-300/400/500
MAINTENANCE MANUAL

OPEN LEVER CLOSED LEVER
2
DRAIN CAP TOILET  FLUSH PORTS 4  SEE  A 
AUXILIARY FLUSH PORT 4  HANDLE VALVE DRAIN DRAIN CAP TOILET  SEE  B 
VALVE HANDLE AUXILIARY DRAIN 
1  FLUSH PORT 4  HANDLE VALVE DRAIN 
FWD 
AFT TOILET SERVICE PANEL A 
TOILET DRAIN CAP  1 
3  DRAIN CAP TOILET 
1 4 3 2  Figure 301 Toilet Service Panels B FORWARD TOILET SERVICE PANEL AIRPLANES WITH THE TOILET DRAIN CAP AND THE DONUT PLUG SOME AIRPLANES HAVE FLUSH PORTS WITH CAPS AIRPLANES WITH THE PUSH-TO-OPEN LEVER ON THE TOILET DRAIN CAP AIRPLANES WITH THE OPEN/CLOSE LEVERS ON THE TOILET DRAIN CAP  FWD 

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A
737-300/400/500MAINTENANCE MANUAL
 L.  If you use too much chemical precharge, the toilet tanks can become full with less use.
 TASK 12-17-00-603-001
 2.  Toilet Servicing
________________
 A.  General
 CAUTION:  DO NOT PERMIT TOILET FLUIDS TO CONTACT THE AIRCRAFT STRUCTURE
_______ TOILET FLUIDS CAN CAUSE CORROSION, WHICH WILL DAMAGE THE AIRPLANE STRUCTURE.
 (1)  Do not permit toilet fluids to contact the airplane structure as corrosion can result. If contact does occur, thoroughly clean the affected area with a mixture of soap and water.
 WARNING:_______DO NOT OVER-SERVICE THE TOILET SYSTEM. SPILLAGE OF TOILET FLUIDS CAN ENTER ELECTRICAL AND/OR ELECTRONIC SYSTEMS AND CAUSE DANGEROUS MALFUNCTIONS. THIS COULD NEGATIVELY EFFECT THE FLIGHT SAFETY OF THE AIRPLANE AND RESULT IN INJURY OR LOSS OF LIFE TO THE PERSONS ABOARD.
 CAUTION:  MAKE SURE THERE ARE NO TOILET FLUID STAINS ON THE EXTERIOR OF THE AIRPLANE. STAINS ON THE AIRPLANES EXTERIOR CAN BE AN INDICATION OF UNSATISFACTORY SERVICING PROCEDURES, OR IN-FLIGHT LEAKAGE OF THE SERVICE DRAIN VALVE.
 CAUTION:  MAKE SURE THERE IS NO IN-FLIGHT ICE BUILDUP FROM THE FORWARD
_______ TOILET SERVICE PANEL. ICE BUILDUP IS THE RESULT OF A LEAKING SERVICE DRAIN VALVE. IF THE FORWARD SERVICE PANEL DRAIN VALVE LEAKS, AND ICE BUILDUP OCCURS AROUND THE VALVE, THE RELEASE OF ICE IN FLIGHT CAN CAUSE DAMAGE TO THE WING LEADING EDGE, THE ENGINE STRUT AND NACELLE, AND THE ENGINE ITSELF.
 (2)  Make sure the Service Panel drain valve fully closes and seals at every service operation. Drain valve leakage can cause ice to form which can, when it separates from the airframe, cause damge to the airplane.
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A 737-300/400/500MAINTENANCE MANUAL
 B. Equipment
 (1)  
Toilet service cart

 (2)  
Y-fitting - Roylyn Part No. 2651-133; Roylyn, Inc., Glendale, California

 C. Consumable Materials
 (1)  
B00490 Chemical Precharge:

 (2)  
Chemical Precharge:
　
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