S 286-185

 (2)  
Internal access to the aft outboard lower corner of the center tank is through center tank access panel under the left air conditioning door (AMM 28-11-31/401).

 S 286-186

 (3)  
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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

LOWER CHORD
NO. 1 INTERNAL TANK - AFT INBOARD LOWER CORNER
A
No. 1 Internal Tank - Aft Inboard Lower Corner Figure 629 (Sheet 1)
F42371
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
REAR SPAR TERMINAL STIFFENERRIB WEB FITTING
RIB
STIFFENER REAR SPAR WEB
LOWER
RIB LOWER WING SKIN
CHORD
No. 1 Internal Tank - View of Aft Inboard Lower Corner (Shown Without Sealant) Figure 629 (Sheet 2)
F43441
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 286-187
 (4)  
Leaks from this area can occur when the center tank has 1000 kg (2200 pounds) or more of fuel and when the airplane is parked and level.

 S 286-188

 (5)  
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. 631 to help you find the internal leak point.

 S 286-189
 (6)  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.

 P. External Front Spar Lower Splice
 S 286-190
 (1)  
Leaks can occur in the forward inboard lower corner of the No. 1 or No. 2 tank.

 S 286-191

 (2)  
Leaks can occur in the forward outboard lower corner of the center tank.

 S 286-192

 (3)
External access is through the forward-upper wing-to-body fairing.

 S 286-193

 (4)  
Leaks can occur when the No. 1 or No. 2 tank has 150 kg (330 pounds) or more of fuel.

 S 286-194

 (5)  
Leaks can occur when the center tank has 1000 kg (2200 pounds) or more of fuel.

 (6)
These fuel quantities apply when the airplane is parked and level.

 S 286-196

 (7)  
The external leak point can be at one of these locations:

 (a)  
At a fastener.

 (b)  
At the faying surface between the terminal fitting and spar web.

 S 286-195
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