CENTER TANK - AFT OUTBOARD LOWER CORNER

A
Center Tank - View of Aft Outboard Lower Corner
Figure 630 (Sheet 1)

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737-300/400/500
MAINTENANCE MANUAL

RIB SPAR WEB
RIB WEB
RIB LOWER CHORD
LOWER 
WING SKIN 
REAR SPAR 
LOWER CHORD 
LOWER  FWD 
STIFFENER S-1C  INBD 

Center Tank - View of Aft Outboard Lower Corner (Shown Without Sealant)
Figure 630 (Sheet 2)

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F43530
A
737-300/400/500MAINTENANCE MANUAL
 (c)  
At the faying surface between the terminal fitting and the spar chord.

 (d)  
At the faying surface between the spar web and the spar chord.

 (e)  
At the faying surface between the spar chord and the wing skin.

 (f)  
At the faying surface between the spar chord and the chord splice fitting.

 S 286-197
 (8)  After you find the external leak point, use Fig. 627 and 628 to help you find the internal leak point.
 NOTE: It can help to make sure you found the leak point if you
____
 remove the external sealant.

 Q. No. 1 or No. 2 Tank - Side-of-Body Joint at Stiffener S-9
 S 286-198
 (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-9.

 S 286-199

 (2)  
Internal access ot the afrea 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 286-200
 (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 28-11-31/401) and through the access panel in wing rib WBL 70.85 (AMM 28-11-51/401).

 S 286-201

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

 S 286-202

 (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 286-203

 (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. 634 to help you find the internal leak point.

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

 S 286-204
 (7)  The internal leak point can be at one of these locations:
 (a)  At a fastener fillet seal.
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A 737-300/400/500MAINTENANCE MANUAL

EXTERNAL VIEW - LOWER FRONT SPAR SPLICE

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External View - Lower Front Spar Splice
Figure 631 (Sheet 1)

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