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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
F43463
A 737-300/400/500MAINTENANCE MANUAL
 S 286-210
 (6)  After you find the external leak point, use the Backblowing procedure and Fig. 634 to help you find the internal leak point.
 S. No. 1 or No. 2 Tank - Side-of-Body Joint at Stiffener S-5
 S 286-211
 (1)  
Leaks can occur from the No. 1 or No. 2 tank at the inboard end at the side-of-body joint at lower stiffener S-5.

 S 286-212

 (2)  
Internal access to the area of the No. 1 or No. 2 tank is through the No. 1 access panel between wing rib WBL 114 and wing rib WBL

 135.5 (AMM 28-11-11/401) and through an access hole through wing rib WBL 114 and wing rib WBL 92.5.
 S 286-213
 (3)  
When the center tank is drained and purged, access to the area of the No. 1 or No. 2 tank can be through the center tank access panel under the left air conditioning door (AMM 28-11-51/401).

 S 286-214

 (4)
External access is through the lower wing-to-body fairing panels.

 S 286-215

 (5)  
Leaks from this area can occur when the No. 1 or No. 2 tank has a residual quantity or more of fuel and when the airplane is parked and level.

 S 286-216

 (6)  
Find the external leak point.

 (a)  
After you find the external leak point, use the Backblowing procedure to find the leak path.

 (b)  
Use Fig. 636 to help you find the internal leak point.

 (c)  
Remove the aerodynamic gap seal in area of suspected leak paths to find the external leak point.

 S 286-217
 (7)  The internal leak point can be at one of these locations:
 (a)  
At a fastener.

 (b)  
At a fastener self-sealing collar.

 (c)  
At the faying surface between the lower wing skin and the skin splice plate.

 (d)  
At the faying surface between stiffeneer S-5 splice plate and wing skin.

 (e)  
At the faying surface between stiffener S-5 and wing skin. 1) The leak can occur anywhere along the length of stiffener

________ S-5.
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A 737-300/400/500MAINTENANCE MANUAL

EXTERNAL SIDE-OF-BODY JOINT AT STIFFENER S-9

A

External View - Side-of-Body Joint at Stiffener S-9
Figure 634

F42236
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A 737-300/400/500MAINTENANCE MANUAL

STIFFENER S-5
INBD SPLICE PLATE

NO. 1 TANK SIDE-OF-BODY JOINT AT STIFFENER S-5

No. 1 Tank - Side-of-Body Joint at Stiffener S-5

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F42213
A

737-300/400/500
MAINTENANCE MANUAL

RIB 
RIB  STIFFENER 
STIFFENER 
RIB WEB 

LOWER  LOWER 
STIFFENER S-6  WING SKIN  FWD 
LOWER 
STIFFENER S-5 
OUTBD

No. 1 Tank - Side-of-Body Joint at Stiffener S-5 (Shown Without Sealant)
Figure 635 (Sheet 2)

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