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757
MAINTENANCE MANUAL

PITOT PROBE (4 LOCATIONS) (2 LOCATIONS)
Probe Location
Figure 303

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757 MAINTENANCE MANUAL
 E. Hot Water Ice Removal Procedure
 S 663-078
 (1)  
You can use hot water at 180-200°F maximum tank temperature to remove ice and snow from the airplane surfaces when the ambient temperature is 26°F, stable or on the increase.

 S 663-079

 (2)  
To prevent the water from freezing again, you must apply anti-icing fluid to the surface immediately after you remove the ice with hot water.

 S 663-080

 (3)  
Add 10% glycol to the hot water tank. This will keep to a minimum the freezing of the remaining water in the equipment you used to remove the ice.

 F. One-Step Ice Removal/Anti-Icing Procedure
 S 663-081
 (1)  
You can do the one-step ice removal/anti-icing procedure, with the deicing/anti-icing fluid heated to 180-200°F. Use this procedure to remove the ice and snow from the airplane when the temperature is below 28°F. After you use the mixture to make the airplane surfaces clear, the remaining fluid will give some anti-icing protection. If the material/deicing fluid that you wanted to remove freezes before it flows off the airplane, it shows that an incorrect mixture of anti-icing fluid was used. You must apply more anti-icing fluid to get more protection.

 S 663-082

 (2)  
The fluid mixed with the water can be Type I deicing (ice removal)/anti-icing fluid, Type II, or Type IV deicing/anti-icing fluid. The holdover time will be longer with the Type II and Type IV deicing/anti-icing fluids. With each fluid, you must use the data that follows to find the quantity of fluid to use in the mixture:

 (a)  
The airline experience

 (b)  
The fluid specifications

 (c)  
The manufacturer's recommendations

 (d)  
The weather conditions.

 S 663-083
 (3)  If you must remove more ice, or it is necessary to do the anti-icing procedure before the subsequent flight, do the full ice removal/anti-icing procedure.
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 G. Two-Step Ice Removal/Anti-Icing Procedure
 S 663-084
 (1)  
The two-step ice removal/anti-icing procedure is usually the recommended procedure when the precipitation conditions are continuous. The second step must be done no more than 3 minutes after you begin the first step. Do the procedure area by area if it is necessary.

 S 663-085

 (2)  
The items that follow will have an effect on the holdover time you get after you do the anti-icing procedure:

 (a)  
The fluid that was used

 (b)  
The weather conditions.

 S 663-101
 (3)  
Thus, you must do frequent inspections to see if it is necessary to apply more fluid.

 S 663-086

 (4)  
If it is necessary to apply more fluid before the subsequent flight, do a full ice removal/anti-icing procedure.

 H. Operation Checks
 S 713-087
 (1)  Before you start the engine, do the steps that follow to make sure the systems will operate correctly:
　
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