S 286-219
(2)
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 286-220
(3)
The external leak point can be at a location shown in Fig. 636.
(a)
A close-up external view is shown in Fig. 636, Sheet 2.
(b)
The large green part immediately outboard of the air conditioning door hinge is the stiffener S-5 splice plate.
S 286-221
(4) Find the external leak point.
(a) Remove the aerodynamic gap seal in areas of suspected leak paths to find the external leak point.
S 286-222
(5) The external leak point can be at one of these locations:
(a)
At a fastener.
(b)
At the faying surface between the lower wing skin and the skin splice plate.
(c)
At the faying surface between stiffener S-5 splice plate and wing skin.
(d)
At the faying surface between stiffener S-5 and wing skin. 1) The leak can occur anywhere along the length of stiffener
________ S-5.
S 286-223
(6) After you find the external leak point, use the Backblowing procedure and Fig. 636 to help you find the internal leak point.
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28-11-00
ALL ú ú 01 Page 680N ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
EXTERNAL SIDE-OF-BODY JOINT AT STIFFENER S-5
A
External View - Side-of-Body Joint at Stiffener S-5
Figure 636 (Sheet 1)
F42240
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28-11-00
ALL ú ú 02 Page 680O ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
OUTBOARD LOWER
WING-TO-BODY CLOSE-UP WING SKIN
FAIRING SUPPORT
SEE A
CENTER WING
LOWER SKIN
LOWER BEAM AT BBL 41
FWD
External View - Side-of-Body Joint at Stiffener S-5
Figure 636 (Sheet 2)
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ALL ú ú 02 Page 680P ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
F43446
A 737-300/400/500MAINTENANCE MANUAL
WING-TO-BODY FAIRING SUPPORT
SPLICE PLATE
WING-TO-BODY FAIRING SUPPORT
CENTER WING
LOWER SKIN
CLOSE-UP
OUTBD
A
FWD
External View - Side-of-Body Joint at Stiffener Figure 636 (Sheet 3)
F43509
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28-11-00
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A
737-300/400/500MAINTENANCE MANUAL
U. External No. 1 or No. 2 Tank- Along the Lower Stiffener S-9
S 286-226
(1)
Leaks can occur from the No. 1 or No. 2 tank anywhere along the lower stiffener S-9.
S 286-227
(2)
Internal access to the area of the No. 1 and No. 2 tank is through any wing access panel between the wing ribs (AMM 28-11-11/401).
S 286-228
(3)
Leaks from this area can occur when the No. 1 or No. 2 tank has a small quantity or more of fuel and when the airplane is parked and level.
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