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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(b)
If you will clean the flaps, extend them to the fully down position.
(c)
Mix the water-base alkaline cleaner for the condition of the surface that you will clean. For heavy material (grease and exhaust particles), mix the heavy duty cleaner.
WARNING:_______ DO NOT USE HIGH-PRESSURE SPRAY EQUIPMENT. HIGH-PRESSURE
SPRAY EQUIPMENT CAN PUT LIQUIDS INTO BEARINGS, JOINTS,
BRAKES, ELECTRICAL CONNECTORS, AND OTHER SEALED
COMPONENTS. LIQUIDS THAT GET INTO THESE AREAS CAN CAUSE
CORROSION, FREEZE DURING AIRPLANE FLIGHT, OR REMOVE
NECESSARY LUBRICANTS.
(d)
Apply the cleaner to the applicable area with swabs or brushes. NOTE: To prevent scratches on the surface, soak the brushes
____ in the cleaner before you use them.
(e)
Let the cleaner soak for approximately 5 minutes. Apply the cleaner again if necessary to keep the surface wet.
CAUTION: DO NOT REMOVE THE LAYER OF GREASE FROM MECHANICAL JOINTS.
_______ THIS GREASE LUBRICATES THE JOINT AND PREVENTS CORROSION.
(f) Carefully rub the surface with a clean brush to help remove unwanted material.
CAUTION: MAKE SURE YOU FLUSH THE SURFACE SUFFICIENTLY TO REMOVE ALL
_______ OF THE CLEANER. THE CLEANER CAN CAUSE CORROSION IF IT IS NOT REMOVED FULLY FROM THE AIRPLANE SURFACE.
(g)
Flush the surface with clean, warm water (160°F maximum).
(h)
Dry the wet surfaces with air or towels.
CAUTION: YOU MUST LUBRICATE ALL THE BEARINGS AND JOINTS IN THE AREA
_______ YOU CLEANED. THE LUBRICANT WILL REMOVE THE UNWANTED FLUIDS WHICH COULD FREEZE OR CAUSE CORROSION TO THE BEARING OR JOINT. IF YOU DO NOT LUBRICATE THE BEARINGS AND JOINTS, DAMAGE TO THE COMPONENTS CAN OCCUR.
(i) Lubricate of the bearings and joints in the cleaned area (Ref Chapter 12).
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MAINTENANCE MANUAL
WARNING: REFER TO AMM 32-00-30 TO REMOVE THE DOOR LOCKS FOR THE
_______ LANDING GEAR. THE DOORS CAN FALL AND CAUSE INJURY OR DAMAGE IF THE LOCKS ARE NOT REMOVED CORRECTLY.
(j) Remove the door locks for the landing gear, and close the landing gear doors (AMM 32-00-30).
S 113-014
(5) Remove Unwanted Hydraulic Fluid CAUTION: IF HYDRAULIC FLUID GETS ON THE BRAKES, YOU MUST REPLACE
_______ THE BRAKES. HYDRAULIC FLUID SPILLS ON TIRES CAN BE CLEANED WITH SOAPY WATER.
(a)
Clean the unwanted hydraulic fluid with a mop or rags. CAUTION: DO NOT USE WATER OR CLEANERS THAT CONTAIN FLAMMABLE
_______
SOLVENTS TO CLEAN WARM COMPONENTS.
(b)
Use the MIL-T-81533A degreasing fluid to clean the hydraulic fluid from warm components.
S 113-015
(6) Clean With Foam NOTE: Use foam when it is possible that the cleaner will stay
____
on the surface for up to 15 minutes.
(a) Fill the tank of the foam generator. Use a liquid that contains one part of cleaner (Water-Base Alkaline Cleaner or Oakite 74L) and 10 to 20 parts of water.
NOTE: If you do not have a foam generator, mix the liquid
____
quickly to make the foam.
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