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 S 203-074
 WARNING:_______DO NOT PUT HOT AIR DIRECTLY ON HALON OR OXYGEN BOTTLES. IF YOU PUT HOT AIR ON THE HALON OR OXYGEN BOTTLES, THE BOTTLES CAN EXPLODE.
 CAUTION: THE TEMPERATURE OF THE HOT AIR MUST NOT BE ABOVE 150°F (70°C).
_______ HOT AIR CAN CAUSE DAMAGE TO AIRPLANE SYSTEMS.
 (6)  
Use a conditioned ground cart to blow hot air on the open airplane structure in the lower lobes and main deck (if it is applicable) to melt the ice that has collected.

 S 203-075

 (7)  
Make sure the airplane's structural drains in the bilge are open to let the water drain.

 S 203-076

 (8)  
Use (Fig. 301) to find the time needed to melt the ice.

 NOTE: You can use a conditioned ground cart to heat the inside of
____ the airplane. This will shorten the time needed to melt the ice.
 S 203-077
 (9)  
After the water drains, put the airplane back to its usual condition.

 S 203-078

 (10)
 You must remove or dry all wet insulation blankets before you install them again.

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737-300/400/500MAINTENANCE MANUAL
 S 203-079
 (11) After the water drains, put the airplane back to its usual condition.
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737-300/400/500MAINTENANCE MANUAL
200

40  50  60  70  80  90  100  110  `F 
5  10  15  20  25  30  35  40  `C 
Time Required to Melt Interior Ice FIgure 301 Air Temperature Outside Airplane 

DURATION OF TIME (HOURS)

180
160
140
120
100
80
60
40
20
0
L62373
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737-300/400/500MAINTENANCE MANUAL
 CLEANING AND WASHING - MAINTENANCE PRACTICES
____________________________________________
 1.  General_______
 A.  Use this procedure to clean and polish the external surfaces of the airplane. Clean the external surfaces frequently to help prevent corrosion and to extend the life of the airplane structure. Clean the surfaces that do not have paint more frequently than the painted surfaces.
 B.  The liquids used in this procedure can cause injury to the skin and eyes, or damage to the airplane. Always wear clothing that will prevent injury when you clean the airplane. The cleaners can cause corrosion if you do not remove them fully from the airplane surfaces. The solvent that you mix with the cleaners is flammable. Keep the solvent away from sources of heat.
 C.  Failure to remove covers from pitot static probes or coverings from static ports before flight may cause large errors in airspeed-sensing and altitude-sensing signals, which may lead to loss of safe flight.
 TASK 12-40-00-102-001
 2.  Clean the External Surfaces of the Airplane___________________________________________
 A.  General
 (1)  
This section includes these procedures:

 (a)  
Remove Light Material (dust and dirt) from Smooth Surfaces

 (b)  
Remove Moderately Heavy Material (oil and mud) from Smooth Surfaces

 (c)  
Remove Heavy Material (grease and exhaust particles) from Smooth Surfaces

 (d)  
Remove Material Around Sensitive Components

 (e)  
Remove Unwanted Hydraulic Fluid

 (f)  
Clean With Foam
　
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