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Fuselage and Vertical Tail Surfaces
 CAUTION: BE CAREFUL WHEN YOU REMOVE THE ICE AND SNOW FROM THE
_______ FUSELAGE AREA WHERE THERE ARE LIGHTS AND ANTENNA. IF YOU ARE NOT CAREFUL, YOU CAN CAUSE DAMAGE TO THE EQUIPMENT.
 1)  The fuselage and the vertical tail surfaces must have no ice or snow on them. This will decrease the aerodynamic drag and the weight of the airplane.
 NOTE: Thin hoar frost is permitted on the top surface of
____ the fuselage if all the vents and ports are clear. Thin hoar frost is a white layer of constant thickness with a sharp crystalline texture. It usually occurs on surfaces that are out on a cold night with no clouds. Hoar frost is thin. You can see items on the surface below the layer of frost, such as paint lines, marks or letters.
 2)  Do not apply hot deicing fluid or hot water directly on the pilots' windshield or the passenger windows. You can let the fluid flow on the windows after you apply it to the top of the cabin. This is permitted since the fluid will be cool when it gets to the window.
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 (d)

A
737-300/400/500MAINTENANCE MANUAL
 3)  All of the deicing/anti-icing fluid on the cockpit windows must be removed before the departure. Carefully examine the windows with the wipers installed. Also, examine the forward areas where the fluid can flow aft on the windshields during the taxi and takeoff. These areas must be clear before the departure.
Engines and APU
 WARNING: PERSONS MUST STAY CLEAR OF THE DANGEROUS AREAS IN
_______ FRONT OF OR IN BACK OF AN ENGINE (AMM 71-00-00) AND IN THE APU EXHAUST (CHAPTER 49) WHEN THEY OPEATE. INJURY OR DEATH OF PERSONS CAN OCCUR IN THESE AREAS.
 1)  For the safety of persons, do not operate the engines or the APU during the ice removal/anti-icing operations. But, if it is necessary to do the ice removal/anti-icing procedure during engine and/or APU operation, do the steps that follow: a) Make sure the engine and/or the APU is at idle speed. b) Do not point the spray of deicing/anti-icing fluids
 directly into the engine and/or APU inlet.
 CAUTION: MAKE SURE THE APU INLET AREA IS CLEAR BEFORE YOU
_______ START THE APU. THE APU CAN BE DAMAGED BY THE ICE OR SNOW THAT COLLECTED IN THE INLET AREA.
 2)  If the engines/APU are on, do the steps that follow:
 -
Close the valves for the air conditioning pack to the cabin.

 -
Close the shutoff valves for the APU air supply.

 This will keep the fumes out of the cabin when you apply deicing/anti-icing fluid in the area of the engines/APU inlets.
 3)  Do not point a spray of deicing/anti-icing fluid directly into the areas below: a) The inlet ducts for the engine or APU b) Exhausts c) Engine thrust reversers d) Engine inlet e) Engine bleed air ducts
 4)  Remove the ice from the Vortex generator on the APU inlet door when the APU is not in operation.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 (e) Brakes 1) When deicing or anti-icing the airplane, protect the wheels and brakes from fluid contamination with the methods below: a) Do not direct a spray of deicing or anti-icing fluids at the wheels or brakes. b) Use suitable covers on the wheels and brakes when operationally feasible.
 c)  Apply the parking brake to reduce incidental contamination of brake friction surfaces when operationally feasible.
 NOTE: The brakes do not need to be re-applied if the _
____ wheels have not rotated since the last brake application.
 2)  Manually remove snow or ice accumulation from the wheels, brakes or tires. A hot air blower may be used for this purpose.
 3)  The brakes must be cool (you can put your hand on the housing) before you apply deicing/anti-icing fluid to the wheel area.
 4)  Use a small quantity of fluid to keep it out of the wheel bearings and heat sink.
 (f) Landing Gear and Doors 1) Make sure there is not a layer of ice and/or snow on the movable parts and the position indication switches for the landing gear. This could prevent the correct operation of the landing gear. Make sure you do not remove lubricants or make the lubricants thinner when you apply deicing/anti-icing fluids. Parts that are not lubricated can cease or not operate without the correct servicing.
　
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