(f)
Install the vacuum blanket again and check for leaks.
NOTE: You will have to repeat the installation of the vaccum
____ blanket and do a check for leaks to make sure all the leaks have been corrected.
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ENTRY DOORS AND THE ESCAPE HATCHES
Typical Door Vacuum Blanket Check Figure 601
H86775
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747-400 MAINTENANCE MANUAL
STRUCTURES FINISHES - DESCRIPTION AND OPERATION
_______________________________________________
1. General_______
A. The structure of the airplane is protected from corrosion by various finishes. The finish applied to a surface depends upon material to be finished and upon whether the surface is an interior or an exterior surface.
B. The exterior surfaces of the airplane are defined, for the purposes of this subject, as follows:
(1)
All aerodynamic surfaces, including doors, hatches, and covers.
(2)
Landing gear and wheel wells.
(3)
All exposed areas of the wing, flight control surfaces, supports, and cove areas (surfaces visible when the flight control surfaces are in the extended or deflected position).
(4)
All areas beneath exterior fairings.
C. BMS 10-79 type II primer is used on some non-errosion area surfaces. BMS 10-11 primer is optional for some non-errosion area surfaces. BMS 10-79 type II and III primer is used on aerodynamic errosion areas and on some non-errosion areas. This is a chemical and solvent-resistant, green-colored, organic finish which may be applied by spray or brush. A coat of white enamel, BMS 10-60 is applied over the primer areas where corrosion protection and better visibility for maintenance purposes are required.
D. Refer to AMM 28-11-00/701 and AMM 28-11-00/801, Fuel Tanks, for integral fuel tank cleaning and sealing.
2. Fire-Resistant Hydraulic Fluid Contamination Areas (Fig. 1)__________________________________________________
A. Certain areas on the airplane are subject to contamination by fire-resistant hydraulic fluid. Refer to Fig. 1 for the locations of possible fire-resistant hydraulic fluid contamination.
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ELEV STA 244
ELEV STA 244
Possible Fire Resistant Hydraulic Fluid Contamination Areas
Figure 1
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747-400 MAINTENANCE MANUAL
INTERIOR AND EXTERIOR FINISHES - DESCRIPTION AND OPERATION
__________________________________________________________
1. General_______
A. Prior to applying paint finishes or systems, the surface to receive the finish requires preparation to ensure good paint adhesion. Surface preparation, depending upon the material, usually consists of removing the old deteriorated finish, removing corrosion, if present, cleaning, and application of conversion coating, if required.
B. Deteriorated or old paint finishes are removed with stripping compounds or by mechanical sanding with abrasive paper.
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