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A 737-300/400/500MAINTENANCE MANUAL

FORWARD INBOARD UPPER CORNER

A
No. 1 Internal Tank - View of Forward Inboard Upper Corner
Figure 620 (Sheet 1)

F42109
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UPPER STIFFENER S-20
FRONT SPAR UPPER CHORD
FRONT SPAR WEB
OUTBD
A
737-300/400/500MAINTENANCE MANUAL
UPPER STIFFENER S-19
UPPER WING SKIN
RIB UPPER CHORD
RIB WEB
RIB STIFFENER
AFT
FRONT SPAR  TERMINAL 
STIFFENER  FITTING  RIB 
STIFFENER 

No. 1 Internal Tank - View of Forward Inboard Upper Corner
(Shown Without Sealant)
Figure 620 (Sheet 2)

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A
737-300/400/500MAINTENANCE MANUAL
 (b)  
At a fastener self-sealing collar.

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

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

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

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

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

 H.  External Rear Spar Upper Splice
 S 286-141
 (1)  
Leaks can occur in the aft inboard upper corner of the No. 1 or No. 2 tank.

 S 286-142

 (2)  
Leaks can occur in the aft outboard upper corner of the center tank.

 S 286-143

 (3)  
External access is through the main wheel well and lower-aft wing-to-body fairing.

 S 286-144

 (4)  
Leaks can occur when the No. 1 or No. 2 tank has 1500 kg (3300 pounds) or more of fuel.

 (a)  
Leaks can occur when the center tank has 4600 kg (10,120 pounds) or more of fuel.

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

 S 286-145
 (5)  The external leak point can be at one of these locations:
 (a)  At a fastener.
 1)  Fasteners can have a secondary fillet seal on the external side.
 NOTE: The figures do not show sealant.
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A 737-300/400/500MAINTENANCE MANUAL

FORWARD OUTBOARD UPPER CORNER

A
Center Tank - Forward Outboard Upper Corner
Figure 621 (Sheet 1)

F42090
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A

737-300/400/500MAINTENANCE MANUAL
UPPER
UPPER STIFFENER S-206
WING SKIN
FRONT SPAR
UPPER CHORD

FRONT SPAR WEB RIB UPPER CHORD
INBD 
RIB WEB  TERMINAL FITTING  FWD 
Figure 621 (Sheet 2) Center Tank - View of Forward Outboard Upper Corner (Shown Without Sealant) 

F43391
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