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

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

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

 (f)  
At the faying surface between the rear spar web and the bulkhead fitting body station 663.

 S 286-176
 (5)  After you find the external leak, use Fig. 630 or 631 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.

 N.  No. 1 or No. 2 Internal Tank - Aft Inboard Lower Corner
 S 286-177
 (1)  
Leaks can occur in the aft inboard lower corner of the No. 1 or No. 2 tank.

 S 286-178

 (2)  
Internal access to the aft inboard lower corner of the No. 1 or No. 2 tank is through 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 and access hole through wing rib WBL 114 and wing rib WBL 92.5.

 S 286-179

 (3)  
When the center tank is drained and purged, access to the aft inboard lower corner 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 286-180
 (4)  External access is through the main wheel well and lower-aft wing-to-body fairing.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

EXTERNAL VIEW - LOWER REAR SPAR SPLICE

A
External View - Lower Rear Spar Splice
Figure 628 (Sheet 1)

F42391
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
BULKHEAD FITTING 
BODY STATION 663 
REAR 
S[AR WEB 

LOWER CHORD REAR SPAR 
FAIRING SUPPORT WING TO BODY  INBD  FAIRING SUPPORT WING TO BODY 
Figure 628 (Sheet 2) External View - Rear Spar Lower Splice 

F43437
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 286-181
 (5)  
Leaks from the area can occur when the No. 1 or No. 2 tank has 150 kg (330 pounds) or more of fuel and when the airplane is parked and level.

 S 286-182

 (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. 630 to help to find the internal leak point.

 S 286-183
 (7)  The internal leak point can be at one of these locations:
 (a)  
At a fastener fillet seal.

 (b)  
At a fastener self-sealing collar.

 (c)  
At a fillet seal at the terminal fitting and rear spar web

 (d)  
At a fillet seal at the rear spar web and the rear spar chord.

 (e)  
At a fillet seal at the rear spar chord and the wing skin.

 (f)  
At a fillet seal at the rear spar chord and the chord splice plate.

 (g)  
At a fillet seal at the seal pan and wing structure.

 O. Center Tank - Aft Outboard Lower Corner
　
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