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