51-31-00
 ALL  ú ú 01 Page 10 ú Apr 10/89
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A

747-400
MAINTENANCE MANUAL

SEALING REQUIREMENTS
PRESSURE SEAL1-A (INTERMEDIATE) - FORWARD FACE OF PRESSURE DOME
FIREWALL SEAL2-A (INTERMEDIATE) - AFT FACE OF FIREWALL
WEATHER SEAL 3-A (INTERMEDIATE) - EXTERNAL SURFACE OF AIRFRAME ENVELOPE
AERODYNAMIC SEAL
________________
4-A (LIMITED)  - HORIZONTAL STABILIZER AND FIN 
FUEL SEAL_________ 
5-A (FILLET)  - HORIZONTAL STABILIZER 

1 COLLECTOR RING, CONTROL CABLE OUTLETS, PLATE SPLICE JOINTS AND VARIOUS OPENINGS PRESSURE SEAL PER 65B02626 SEAL DRAWING

PERIPHERY OF AFT FACE STA 2658 APU SUPPORT BRACKETS AND FUEL LINE INLETS FIREWALL SEAL PER 65B02813 SEAL DRAWING ALL EXTERNAL NONBONDED SEAMS, GAPS AND HOLES WEATHER SEAL PER 65B02648 SEAL DRAWING ALL HOLES THAT LEAD INTO HORIZONTAL STABILIZER AND FIN AND ALL SKIN GAPS FORWARD OF THE
REAR SPAR OF THE HORIZONTAL STABILIZER AND FIN AERODYNAMIC SEAL PER 65B02648 SEAL DRAWING WITH EXCEPTION OF DRAIN HOLES AND REMOVABLE PANEL SKIN GAPS
Seal Index and Requirements - Body Section 48,
Horizontal Stabilizer and Vertical Fin
Figure 5 (Sheet 2)

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 51-31-00
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SHT. NO.  DRAWING NO.  DESCRIPTION 
1  65B02813  SEAL APPLICATION - FIREWALL, BODY STATION 2658 
1  65B02648  SEAL APPLICATION - EXTERIOR 
2  65B02626  SEAL APPLICATION - PRESSURE DOME 
1  180U0014  SEAL APPLICATION - HORIZONTAL STABLIZER 

Seal Index and Requirements - Body Section 48,
Horizontal Stabilizer and Vertical Fin
Figure 5 (Sheet 3)

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 51-31-00
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1169
MAIN FUEL TANKS.
ABSOLUTE FUEL SEAL PER CHAPTER 28 REQUIRED ON ALL INTERNAL BOUNDARIES OF TANK, EXCEPT WBL
470 AND WBL 834 TANK END RIBS WHICH HAVE ABSOLUTE FUEL SEAL ON OUTBOARD SIDE ONLY. ABSOLUTE
FUEL SEALS REQUIRED AT SPECIFIED INTERVALS ALONG ALL SEALED SEAMS (EXCEPT FUEL VENT STRINGERS)

RESERVE TANK.
ABSOLUTE FUEL SEAL PER CHAPTER 28 REQUIRED ON ALL INTERNAL BOUNDARIES OF TANK, EXCEPT WS
1485 RIB WHICH WILL HAVE ABSOLUTE FUEL SEAL ON BOTH SIDES, AND WS 1168 RIB WHICH WILL
HAVE ABSOLUTE FUEL SEAL ON INBOARD SIDE ONLY

DELETED

VENT SURGE TANK.
ABSOLUTE FUEL SEAL PER CHAPTER 28 REQUIRED ON ALL INTERNAL BOUNDARIES OF THE TANK

FUEL VENT STRINGERS (INTEGRAL TANKS) ABSOLUTE FUEL SEAL PER CHAPTER 28 REQUIRED ON EXTERNAL
BOUNDARIES OF VENTS

LEADING EDGE SEAL RIB.
ABSOLUTE FUEL SEAL UP 2.0 INCHES FROM BOTTON OF RIB. LIMITED SEAL REMAINDER OF RIB (EXCEPT
DO NOT SEAL CABLE OPENINGS IN FAIRLEADS)

THERMAL ANTI-ICING.
LIMITED SEALING

VENT OUTLET. ABSOLUTE FUEL SEAL PER CHAPTER 28 REQUIRED ON VENT LINE AND NACA VENT OUTLET.

CLOSURE RIB.
ABSOLUTE VAPOR SEAL LE TO TE

LEADING EDGE SEAL RIB.
ABSOLUTE FUEL SEAL 2.0 INCHES UP FROM LOWER LEADING EDGE PANEL FROM FRONT SPAR FORWARD TO BS 958.
LIMITED VAPOR SEAL REMAINDER OF RIB

Seal Index and Requirements Outboard Wing Figure 6
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