12-33-01
 ALL  ú ú 01B Page 309 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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A
747-400
MAINTENANCE MANUAL

 (i)  
Make sure there is no ice, snow, or frost on the wing for the takeoff. To do this, the maintenance persons must carefully examine the airplane before the departure.

 (j)  
You must remove snow from a parked airplane regularly. This will make sure that a large quantity of snow will not collect and possibly freeze on the airplane surface.

 CAUTION: CAREFULLY MOVE ROPES OR FABRIC HOSES ON THE WING OR
_______ FUSELAGE. EQUIPMENT THAT IS INSTALLED ON THE SURFACE OF THE WING OR FUSELAGE CAN BE DAMAGED BY THE MOVEMENT OF THE ROPES OR FABRIC HOSE.
 (k)  
Use brooms with long handles to remove the snow from the wings and horizontal stabilizers. This will make it easier. You can use ropes or a fabric fire hose to remove the snow from the fuselage. Move the rope or hose back and forth on the top of the fuselage as you move it aft.

 (l)  
Before you move an airplane out of a warm hangar during icing conditions, do the anti-icing procedure on the airplane. This will make it less possible that ice or snow will melt when it touches the warm airplane and freeze again.

 (m)  
If you remove ice with water that is not hot, you must do it in a warm hangar, if it is possible. Keep the airplane in the hangar until the surfaces are dry. It will be necessary to do a check of those areas where the water can collect and freeze. If anti-icing fluid is applied, it is not as necessary for the airplane to dry.

 (n)  
General Precautions

 WARNING:_______DEICING/ANTI-ICING FLUID IS DANGEROUS. DO NOT LET IT TOUCH THE SKIN OR EYES, AND USE CLOTHING THAT GIVES SUFFICIENT PROTECTION.
 1) Do not point a spray of deicing/anti-icing fluid directly at or into the pitot inlets, TAT probes or static ports. 2) Do not point a spray of hot deicing fluid or hot water directly at cold windows. 3) Do not point a spray of deicing/anti-icing fluid directly into the engine, APU, scoops, vents, drains, etc.
 4)  Do not use more than 10 psi on an area of 25 square inches. Do not point a solid flow of fluid directly at the airplane surfaces.
 5) Make sure that ice and/or snow is not pushed into the areas around the flight controls during ice and snow removal. 6) Remove all of the ice or snow from the door and girt bar areas before you close a door.
 7)  Do not open the cargo doors if it is not necessary. Remove the ice and snow from the cargo containers before you put them on the airplane. Before the doors are closed for flight, put anti-icing fluid on these areas. a) The pressure relief doors
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 12-33-01
 ALL  ú ú 01B Page 310 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 b) The lower doorsills c) The bottom edge of the door 8) Do not use hard or sharp tools to remove the ice from the airplane surface.
 9)  The right and left sides of the wing and horizontal stabilizer must get the same and full ice removal/anti-icing procedure.
 10) Remove all of the deicing/anti-icing fluid from the cockpit windows before the departure. Make sure you carefully examine the windows with the wipers installed. Make sure that fluid is removed from all the forward areas where it can flow back on the windshields during the taxi and takeoff. These areas must be clean before the departure.
 11) After the ice removal/anti-icing procedure has been done many times, you must examine the areas and holes where there is less or no aerodynamic flow. Look for remaining deicing/anti-icing fluids in the areas such as balance bays and wing and stabilizer rear spars.
 (o)  When there is slush on the runways, examine the airplane when it gets to the ramp. Look for slush that collected on the airplane or damage to the airplane surfaces. 1) Examine the areas that follow for ice that collected and
 damage to the skin panels (remove the ice if it is necessary). a) The leading edges b) The flaps c) The flap wells d) The vertical stabilizer e) The rudder f) The bottom and the top surface of the horizontal
 stabilizers and elevators 2) Examine the wheel well area sfor ice, slush and snow that collected. Remove the ice if it is necessary. 3) Examine the skin panels behind the wheel wells for damaged edges.
　
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