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 THE ISOLATION SEAL (USUALLY A FAYING SURFACE TYPE) PLACED BETWEEN MATING SURFACES TO ISLOLATE 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 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.
 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.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400
MAINTENANCE MANUAL

INBOARD NACELLE STRUT
LH SIDE VIEW

INTERMEDIATE SEAL - ALL HOLES, SLOTS, JOGGLES AND ENCLOSURE JOINTS (SEAMS) UNLESS SEAM HAS BEEN BONDED AT ASSEMBLY. FASTENERS OF ANY TYPE DO NOT REQUIRE SEALING IN INTERMEDIATE SEAL LEVEL AREAS.
ABSOLUTE SEAL - (NO LEAKAGE ALLOWED) ALL SEAMS, HOLES, SLOTS, JOGGLES, FASTENERS AND STRUCTURE FASTENED TO SEAL PLANE MUST BE SEALED.

-
INTERMEDIATE (FIREWALL SEAL)

-
INTERMEDIATE (HYDRAULIC SEAL)

-
INTERMEDIATE (FUEL VAPOR SEAL)

-ABSOLUTE (FUEL SEAL)
Seal Index and Requirements Nacelle Struts Figure 8 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400
MAINTENANCE MANUAL

NSTA
NSTA
282.93

OUTBOARD NACELLE STRUT
LH SIDE VIEW

INTERMEDIATE SEAL - ALL HOLES, SLOTS, JOGGLES AND ENCLOSURE JOINTS (SEAMS) UNLESS SEAM HAS BEEN BONDED AT ASSEMBLY. FASTENERS OF ANY TYPE DO NOT REQUIRE SEALING IN INTERMEDIATE SEAL LEVEL AREAS.
ABSOLUTE SEAL - (NO LEAKAGE ALLOWED) ALL SEAMS, HOLES, SLOTS, JOGGLES, FASTENERS AND STRUCTURE FASTENED TO SEAL PLANE MUST BE SEALED.

-
INTERMEDIATE (FIREWALL SEAL)

-
INTERMEDIATE (HYDRAULIC SEAL)

-
INTERMEDIATE (FUEL VAPOR SEAL)

-ABSOLUTE (FUEL SEAL)
Seal Index and Requirements Nacelle Struts Figure 8 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400
MAINTENANCE MANUAL

SEALING REQUIREMENTS
WEATHER SEAL: INTERMEDIATE - ALL EXTERNAL SKIN GAPS AND NONBONDED SEAMS
AERODYNAMIC SEAL:  LIMITED - ALL EXTERNAL GAPS INVOLVED IN THE AIRSTREAM TO MEET AERODYNAMIC REQUIREMENTS
CAUTION:_______  REPLACE SEALANT IF SEALANT BECOMES LOOSE OR IS MISSING. CLEAN SURFACE AND APPLY PRIMER BEFORE APPLYING SEALANT. DO NOT APPLY SEALANT WHERE SEALANT WILL PREVENT FLOW OF LIQUID TO DRAIN HOLES AND PAST THE ENDS OF STIFFENERS ETC. USE LEVELING COMPOUND TO PREVENT PUDDLING AND TO ASSURE DRAINAGE
301U4700  AERODYNAMIC SMOOTHNESS REQMT 
310T4010  FIREWALL, FUEL AND VAPOR SEAL APPLICATION - STRUT 
310U8792  PI TUBING INST. STRUT INBD 
310U8892  WIRE BUNDLE INSTALLATION SECTION 31, LEFT AND RIGHT INBD STRUTS 
311U2010  SEALING APPLICATION INBD, NAC STRUT 
311U2080  VAPOR BARRIER INST. -STRUT STRUT/WING - INBD NACELLE 
311U2630  DRAIN INSTL - INBD NACELLE STRUT 
311U4011  STRUT SYSTEMS SEAL APPLICATION - INBOARD 
312U2330  INBD NACELLE STRUT PNEUMATIC DUCT INSTL -
　
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