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747-400
MAINTENANCE MANUAL
PRIMARY INTEGRAL FUEL TANK SEAL PLANE.
ABSOLUTE FUEL SEAL PER CHAPTER 28 REQUIRED ON:
1A. LOWER PANEL, INTERIOR SURFACE, BETWEEN FRONT SPAR AND REAR SPAR.
1B. UPPER PANEL, INTERIOR SURFACE, BETWEEN FRONT SPAR AND REAR SPAR.
1C. ENTIRE AFT SURFACE OF FRONT SPAR.
1D. ENTIRE FWD SURFACE OF REAR SPAR.
1E. EXTERNAL SEAL PLANES OF FUEL VENTS.
SECONDARY FUEL SEAL PLANE.
ABSOLUTE FUEL SEAL PER BAC5000 REQUIRED ON:
2A. LOWER PANEL, EXTERIOR SURFACE, BETWEEN FRONT SPAR AND REAR SPAR (SEE NOTE).
2B. UPPER PANEL, EXTERIOR SURFACE, BETWEEN FRONT SPAR AND REAR SPAR (SEE NOTE).
____FOR AREAS 2A & 2B SEALANT SHALL BE OMITTED FROM THE MANUFACTURED HEAD OF ALUMINUM RIVETS
NOTE:
UNLESS SPECIFICALLY CALLED OUT ON THE RESPECTIVE SEAL APPLICATION DRAWING.
2C. ENTIRE FWD SURFACE OF FRONT SPAR.
NO. SEC APL DRAWING NO. DESCRIPTION
11 65B07736 SEAL APPLICATION - FRONT SPAR
11 110U3108 SEAL APPLICATION - REAR SPAR
11 65B07732 SEAL APPLICATION - UPPER PANEL
11 65B07733 SEAL APPLICATION - LOWER PANEL
Seal Index and Requirements Wing Center Section
Figure 7 (Sheet 2)
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747-400 MAINTENANCE MANUAL
GENERAL REQUIREMENTS
____________________
ALL NUTPLATES AND THREADED OR SWAGED COLLAR FASTENERS THAT PENETRATE AN ABSOLUTE
SEAL AREA MUST BE SEALED.
DOME TYPE NUTPLATES, WITH OR WITHOUT INTEGRAL O-RING, MUST BE FILLET SEALED.
THREADED OR SWAGED COLLAR FASTENERS, WITH A MECHANICAL SEAL DEVICE LOCATED ON THE
SEAL PLANE, DO NOT REQUIRE FILLET OR CAP SEALING UNLESS SPECIFICALLY CALLED OUT
ON SEAL APPLICATION DRAWING.
ALUMINUM RIVETS INSTALLED WITH A SELF-SEALING END ON SEAL PLANE DO NOT REQUIRE
ADDITIONAL SEALING UNLESS SPECIFICALLY CALLED OUT ON SEAL APPLICATION DRAWING.
ON PRIMARY INTEGRAL TANK SEAL PLANE AREAS:
SEALANT SHOULD NOT BE APPLIED OVER CORROSION PROTECTIVE COATING UNLESS
SPECIFICALLY CALLED OUT ON SEAL APPLICATION DRAWING.
SEALANT MAY BE APPLIED OVER UNPRIMED AREAS.
ON AREAS OTHER THAN THE PRIMARY INTEGRAL TANK SEAL PLANE: SEALANT MAY BE APPLIED
OVER BARE AREAS OR CORROSION PROTECTIVE COATING.
FUNCTIONAL LEAK TEST PER D6-13200 (AFTER SECTION 11 AND SECTION 12 ASSY AND PRIOR
TO APPLICATION OF SECONDARY FUEL SEAL PLANE SEALANT).
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747-400 MAINTENANCE MANUAL
DEFINITIONS
___________
LEVELS OF SEALING.
ABSOLUTE SEAL - REQUIRES SEALING ALL SEAMS AND OPENINGS OF ANY SHAPE COMMON TO THE SEAL PLANE AND ALL FASTENERS THAT PENETRATE THE SEAL PLANE.
EXTENSIVE SEAL - SAME AS "ABSOLUTE SEAL" EXCEPT FASTENERS INSTALLED IN CLASS I OR CLOSER TOLERANCE HOLES DO NOT REQUIRE SEALING.
TYPES OF APPLIED SEALS (FILLET, PREPACK, FAYING SURFACE AND INJECTION SEALS).
PRIMARY SEAL - THE SEALANT WHICH PRIMARILY PREVENTS LEAKAGE AND IS IN DIRECT CONTACT WITH FUEL AND PRESSURE.
NOTE: IN SPECIFIC AREAS, SUCH AS SPAR SHEAR TIES, TWO PRIMARY SEALS ARE
____ REQUIRED FOR REALIBILITY (I.E., FILLET SEAL OVER FAYING SURFACE SEAL).
SECONDARY SEAL - ALL OTHER APPLIED SEALANT.
THE SEALANT MATERIAL INSTALLED IN CAVITIES TO BACK UP OR SUPPORT THE PRIMARY FILLET SEAL PLACED OVER IT.
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