NOTE: MIL-A-8243D Type 1 fluid is acceptable in a 50/50
____ fluid/water concentration. MIL-A-8243D Type 2 fluid is acceptable in any concentration. There are no holdover time guidelines for MIL-A-8243D fluids.
(2) Type II and Type IV (non-newtonian) fluids:
(a) G02301 SAE AMS 1428 latest revision
D. Guidelines
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A
737-300/400/500MAINTENANCE MANUAL
S 663-070
CAUTION: THE REPEATED APPLICATION OF TYPE II AND TYPE IV
_______ DEICING/ANTI-ICING FLUIDS, WITHOUT THE SUBSEQUENT APPLICATION OF TYPE I DEICING/ANTI-ICING FLUID OR HOT WATER, MAY CAUSE A RESIDUE TO COLLECT IN AERODYNAMICALLY QUIET AREAS. THIS RESIDUE MAY REHYDRATE AND FREEZE UNDER CERTAIN TEMPERATURE, HIGH HUMIDITY AND/OR RAIN CONDITIONS. THIS RESIDUE MAY BLOCK OR IMPEDE CRITICAL FLIGHT CONTROL SYSTEMS. THIS RESIDUE MAY REQUIRE REMOVAL.
(1) General
(a)
Many conditions can have an effect on which procedure you use to remove ice, snow, or frost or to make sure it does not collect and become attached to the airplane surfaces. Each operator must look at the local weather conditions. If it is possible, use the procedures that were used before with the same conditions. A general guideline is, Type II and Type IV fluids give a longer holdover time than Type I fluids. Use Type II and Type IV fluids to decrease the risk that ice, snow, or frost will collect on the airplane during a long taxi. For example, Fig. 301 gives the general guidelines to help you find the correct ice, snow, or frost removal procedure. This gives you the same procedure you will find when you use the full guidelines in this procedure.
(b)
Use a hot mixture of water and Type I, Type II or Type IV deicing/anti-icing fluids when you do the one-step ice removal/anti-icing procedure. The three items below will have an effect on the quantity of water mixed with the fluid and the temperature you use: 1) The weather conditions 2) The holdover protection that is necessary 3) The condition of the airplane
(c)
It is necessary to have sufficient fluid temperature and flow rate to flush the ice and snow from the airplane surfaces when it collects there. More ice, snow or frost will not collect on the airplane surfaces where there is remaining fluid. The mixture and type of fluid used will have an effect on the holdover time. The weather conditions can make it necessary to apply the fluid/water mixture again. This will be necessary to remove the frozen fluid that collected since the fluid/water mixture was applied last. This is also done to increase the protection time. You can use cold water to remove snow if the conditions that follow occur:
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A 737-300/400/500MAINTENANCE MANUAL
GUIDELINE SUMMARY OF GUIDELINES
REMOVAL/PROTECTION SNOW, ICE OR FROST PROCEDURE STABLE OR ON THE INCREASE 34`F OR ABOVE TEMP 27`F TO 34`F TEMP STABLE OR ON THE INCREASE BELOW 27`F
HEATED - WATER THAT IS NOT PERMITTED PROCEDURE TO REMOVE THE SNOW FROM THE APPLY ANTI-ICING FLUID OUTSIDE. OPTIONAL TO SURFACES IN THE HANGAR OR NOT PERMITTED NOT PERMITTED
AFTER DEICING ANTI-ICING FLUID TANK) APPLY (180-200`F AT THE - HOT WATER DEICING REMOVE THE ICE, SNOW OR FLUID APPLY THE ANTI-ICING OUTSIDE. OPTIONAL TO FROST IN THE HANGAR OR PERMITTED PROCEDURE TO PROCEDURE RECOMMENDED OR OUTSIDE OR FROST IN THE HANGAR TO REMOVE THE ICE, SNOW NOT PERMITTED
TANK) TO 200`F AT THE - DECING FLUID (180 - ANTI-ICING FLUID IT IS NOT NECESSARY ABOVE FREEZING) TO USE IN TEMPERATURES OF THE FLUID IS TOO HIGH NOT RECOMMENDED (THE COST PERMITTED PROCEDURE TO HOT WATER PROCEDURE APPLY IF YOU USE THE FROST OUTSIDE REMOVE THE ICE, SNOW OR PROCEDURE RECOMMENDED TO FROST OUTSIDE REMOVE THE ICE, SNOW OR APPLY AS PROTECTION IF CONDITION WILL POSSIBLY AN ICE, SNOW OR FROST OCCUR
APPLY AS PROTECTION TO KEEP THE COLLECTION OF ICE, SNOW OR FROST TO A MINIMUM NECESSARY DEICING IF IT IS APPLY AGAIN AFTER
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