................................................................................ | 1 | 110U3101 |SEAL APPLICATION - FRONT SPAR | | 2 | 110U3102 | - REAR SPAR | | 3 | 110U3103 | - UPPER PANEL | | 4 | 110U3104 | - LOWER PANEL | | 5 | 65B07717 | - RIB, BBL 127.50 | | 6 | 65B07718 | - RIB, WBL 470 | | 7 | 65B07719 | - RIB, WBL 834 | | 8 | 65B07720 | - RIB, WS 1168 | | 9 | 110U3105 | - RIB, WS 1485 | | 10 | 110U3106 | - RIB, MSS 1558.72 | | 12 | 65B07724 | - LEADING EDGE AND TRAILING EDGE | | 12 | 110U3109 | - WING EXT VAPOR SEALING | | 13 | 110U0902 |SEAL APPLICATION - DRY BAY VARIABLE | 2......................….......................................................1
 NOTE: The gaps between the wing leading edge panels (Ref P/N 65B01132) require a
____ special sealant because of greater flexibility of these joints. When the sealant in these joints require repair or replacement proceed as follows. Remove old loose sealant. Clean thoroughly with solvent, Series 92 (AMM 20-30-92/201) to remove all oil and grease and reapply RTV 157.
 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 SEAL PLANE, DO NOT REQUIRE FILLET OR CAP SEALING.
 ALUMINUM RIVETS INSTALLED WITH A SELF-SEALING END ON SEAL PLANE DO NOT REQUIRE ADDITIONAL SEALING.
 SEALANT SHOULD NOT BE APPLIED OVER CORROSION PROTECTIVE COATING ON PRIMARY INTEGRAL TANK SEAL PLANE. SEALANT MAY BE APPLIED OVER BARE AREAS ON PRIMARY INTEGRAL TANK SEAL PLANE. IN AREAS OTHER THAN PRIMARY INTEGRAL TANK SEAL PLANE, SEALANT MAY BE APPLIED OVER BARE AREAS OR CORROSION PROTECTIVE COATING.
 FUNCTIONAL LEAK TEST PER D6-13200.
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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.
 INTERMEDIATE SEAL - SAME AS "EXTENSIVE SEAL", EXCEPT FASTENERS DO NOT REQUIRE SEALING. LIMITED SEAL - SAME AS "EXTENSIVE SEAL", EXCEPT SEAMS AND FASTENERS 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 RIB SHEAR TIES, TWO PRIMARY SEALS ARE
____ REQUIRED FOR RELIABILITY (I.E., FILLET SEAL OVER A FAYING SURFACE SEAL).
 SECONDARY SEAL - ALL OTHER APPLIED SEALANT.
 THE SEALANT MATERIAL INSTALLED IN CAVITIES TO BACKUP OR SUPPORT THE PRIMARY FILLET SEAL PLACED OVER IT.
 THE ISOLATION SEAL (USUALLY A FAYING SURFACE TYPE) PLACED BETWEEN MATING SURFACES TO ISOLATE OR LIMIT FUEL SPREADING UNDER STRUCTURAL PARTS AND TO FACILITATE LEAK TRACING AND SERVICE REPAIRS.
 THE ADDITIONAL SEALANT, LOCATED "DOWNSTREAM" FROM A POTENTIAL PRIMARY SEAL PLANE LEAK SOURCE, WHICH WILL ADEQUATELY CONTAIN FUEL OR VAPOR IF THE PRIMARY SEAL FAILS .
 TYPES OF SEAL PLANES.
 PRIMARY INTEGRAL FUEL TANK SEAL PLANE - THE COMBINATION OF STRUCTURE, SEALANT AND SEALING DEVICES THAT PROVIDES THE INITIAL, CONTINUOUS BARRIER TO CONFINE FUEL AND VAPOR WHICH, IF PENETRATED, MAY RESULT IN A LEAK.
 SECONDARY FUEL AND VAPOR CONTROL SEAL PLANE - THE COMBINATION OF STRUCTURE, SEALANT AND SEALING DEVICES THAT PROVIDES AN EFFECTIVE BARRIER TO CONTROL FUEL AND VAPOR IN CASE OF PRIMARY SEAL PLANE FAILURE.
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747-400
MAINTENANCE MANUAL

Seal Index and Requirements Wing Center Section
　
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