S 663-007

 (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 663-008
 (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 663-009

 (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 fluid. 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 663-010
 (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.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 G. Two-Step Ice Removal/Anti-Icing Procedure
 S 663-011
 (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 663-012

 (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.

 (c)  
Thus, you must do frequent inspections to see if it is necessary to apply more fluid.

 S 663-013
 (3)  If it is necessary to apply more fluid before the subsequent flight, do a full ice removal/anti-icing procedure.
 H. Operation Checks
 S 713-014
 (1)  Before you start the engine, do the steps that follow to make sure the systems will operate correctly.
 (a)  
Operate all the control surfaces. Use a person on the ground to make sure the control surfaces move the full travel.

 (b)  
Examine the openings in the pitot probe, probes installed on the strut or in the engine inlet, and the static ports. Make sure they are clear of ice or snow.

 (c)  
Make sure there is no ice or snow collected on the landing gear and or in the wheel wells.

 (d)  
Make sure all the inlets are clear of ice or snow.

 (e)  
Make sure all the drains are clear and not blocked.

 (f)  
Make sure the engine compressor can turn freely.

 NOTE: If the fan (N1) cannot turn during an engine start
____ because of ice, this can cause heavy damage. When it is possible that water collected in the engine at freezing temperatures, you must make sure the fan (N1) can turn before you start the engine. You can see the low pressure (LP) rotor fan blades turn from the ground. If the wind does not turn the fan, you can turn it by hand. If you will motor the engine to make sure the engine compressor turns, use the procedure in AMM 71-00-00.
 (g)  Make sure all of the doors, including the doors to the off-wing escape slide compartments, are clear of ice.
 I. To Park the Airplane
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