(h)  
A layer of anti-icing fluid will give protection from ice, snow, and frost if you apply the fluid to a dry wing. A mixture of anti-icing fluid and water (the ambient temperature will have an effect on when to use a mixture with water) will also give protection if you apply it to a dry wing. The fluid must be applied before conditions start. Use the conditions that follow to make a decision to apply anti-icing fluid to a cold soaked airplane:

 -There is precipitation.
 -The air temperature is above freezing.
 Since the temperature of the external surfaces of the airplane can be below freezing, ice can occur and attach to the surface. There can be clear ice below the layer of snow or slush, which is not easy to find. Make sure that all the ice is removed after you do the ice removal or ice removal/anti-icing procedure. Possibly it will be necessary to feel the surface to do the inspection.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
GUIDELINE SUMMARY FOR APPLICATION OF TYPE I FLUID MIXTURES (MINIMUM CONCENTRATIONS) AS A FUNCTION OF OAT
OUTSIDE AIR  ONE-STEP PROCEDURE  TWO-STEP PROCEDURE 
TEMPERATURE OAT  DEICING/ANTI-ICING  1ST STEP: DEICING  2ND STEP: ANTI-ICING 1 
AND ABOVE -3`C (27`F)  10`C (18`F) BELOW OAT FP OF HEATED FLUID MIXTURE SHALL BE AT LEAST  SHALL BE NOT MORE THAN FP OF HEATED FLUID MIXTURE FLUID AND WATER. TANK, OR A HEATED MIX OF (180`F) MINIMUM AT THE WATER TREATED TO 82`C 3`C (5`F) ABOVE ACTUAL OAT.  FP OF FLUID MIXTURE SHALL BE AT LEAST 10`C (18F) BELOW ACTUAL OAT 
-3`C (27`F) BELOW 

TYPE I FLUIDS 
OAT FP `C `F  OUTSIDE AIR TEMPERATURE FREEZING POINT DEGREES CELSIUS DEGREES FAHRENHEIT 

_______WING SKIN TEMPERATURES MAY DIFFER AND IN SOME CASES MAY BE LOWER THAN OAT.CAUTION: A STRONGER MIX (MORE GLYCOL) CAN BE USED UNDER THE LATTER CONDITIONS.
____FOR HEATED FLUIDS, A FLUID TEMPERATURE NOT LESS THAN 82`C (180`F) AT THE TANK
NOTE: IS DESIRABLE. UPPER TEMPERATURE LIMIT SHALL NOT EXCEED FLUID AND AIRPLANE MANUFACTURER'S RECOMMENDATIONS.

1 TO BE APPLIED BEFORE FIRST STEP FLUID FREEZES, TYPICALLY WITHIN 3 MINUTES
Fluid Mixture Guidelines for Deicing
Figure 302 (Sheet 1)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
G69252
A
737-300/400/500MAINTENANCE MANUAL
GUIDELINE SUMMARY FOR APPLICATION OF TYPE II/TYPE IV FLUID MIXTURES (MINIMUM CONCENTRATIONS) AS A FUNCTION OF OAT
CONCENTRATION (PERCENTAGE BY VOLUME)
ANTI-ICING FLUID/WATER

OAT OUTSIDE AIR TEMPERATURE  ONE-STEP PROCEDURE 2  TWO-STEP PROCEDURE 2 
DEICING/ANTI-ICING  1ST STEP: DEICING  2ND STEP: ANTI-ICING 1 
-3`C (27`F) AND ABOVE  HEATED TYPE II/IV 50/50  WATER TREATED TO 82`C OR A HEATED MIX OF TYPE I, (180`F) MINIMUM AT THE TANK TYPE II OR TYPE IV FLUID AND WATER.  TYPE II/IV 50/50 
-3`C (27`F) BELOW TO -14`C (7`F)  HEATED TYPE II/IV 75/25  HEATED SUITABLE MIX OF TYPE I, TYPE II OR TYPE IV  TYPE II/IV 75/25 
BELOW -14`C (7`F) TO -25`C (-13`F)  100/0 HEATED TYPE II/IV  3`C (5`F) ABOVE ACTUAL OAT. WITH FP NOT MORE THAN  100/0 TYPE II/IV 
BELOW -25`C (-13`F)  CONSIDER USE OF TYPE I FLUID WHEN TYPE II/TYPE IV FLUID CANNOT BE USED. CONFORM TO THE LOWEST OPERATIONAL USE TEMPERATURE/AERODYNAMICS ACCEPTANCE LIMITATION. 7`C (13`F) BUFFER BETWEEN THE FP OF THE NEAT FLUID AND OAT, AND THE FLUID SHALL USE OF TYPE II/TYPE IV FLUID FOR ANTI-ICING BELOW -25`C (-13`F) SHALL MAINTAIN 

TYPE II AND TYPE IV FLUIDS
CAUTION:  WING SKIN TEMPERATURES MAY DIFFER AND IN SOME CASES MAY BE LOWER THAN OAT. A STRONGER MIX (MORE GLYCOL) CAN BE USED UNDER THE LATTER CONDITIONS.
NOTE:  FOR HEATED FLUIDS, A FLUID TEMPERATURE NOT LESS THAN 82`C (180`F) AT THE TANK IS DESIRABLE. UPPER TEMPERATURE LIMIT SHALL NOT EXCEED FLUID AND AIRPLANE MANUFACTURER'S RECOMMENDATIONS.

TO BE APPLIED BEFORE FIRST STEP FLUID FREEZES, TYPICALLY WITHIN 3 MINUTES
REFER TO PARAGRAPH 1.C. FOR DEFINITIONS FOR ONE-STEP, TWO-STEP AND ANTI-ICING PROCEDURES.
　
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