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A 737-300/400/500MAINTENANCE MANUAL
(2)
AMM 28-11-11/401, Wing Fuel Tank Access Panels
(3)
AMM 28-11-31/401, Center Tank Access Panel
(4)
AMM 28-11-51/401, Wing Root Rib Access Door
(5)
AMM 28-23-00/201, Defueling
C. Access
(1) Location Zones
221 Center Section Fuel Tank
304 Left Surge Tank
305 Left Fuel Tank
404 Right Surge Tank
405 Right Fuel Tank
D. Leak Detection Tips
S 286-100
(1)
Make sure you have trained persons to do leak detection.
S 286-101
(2)
Have materials and equipment to safely drain, purge and go into the fuel tank.
S 286-102
(3)
Have materials and equipment to safely do leak detection.
F71329
Leakage Tracing Device
Figure 613
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CROSSOVER WING TANK ACCESS DOOR
CROSSOVER VENT CAVITY
NO. 1
CAVITY
NO. 2
CAVITY
NO. 3
VENT COVER INTEGRAL
ASSEMBLY CENTER
(F80080-56) TANK
VENT PLUG
(F80080-100)
SURGE TANK
VENT SCOOP (F80080-88)
VENT COVER DOOR ASSEMBLY ASSEMBLY (F80080-82) ____NUMBERS IN PARENTHESIS
NOTE: (F80080-56) ARE TOOL NUMBERS OF CLOSURE ITEMS.
Plug Installation for the Internal Pressure and Bubble Procedure
Figure 614
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DRAIN VALVE DRAIN VALVE
____DRAIN THE MANOMETER
NOTE: AFTER YOU USE IT TO PREVENT FREEZING.
USE THE VALVE TO ADJUST THE FILL
LEVEL AND TO DRAIN THE TUBING
USE THE VALVE TO DRAIN THE OVERFLOW TRAP
Water Safety Relief Manometer Assembly Figure 615
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(4) S 286-103The external leak point can be found with less time, materials, and equipment when fuel is in the tank.
(5) S 286-104During leak detection at the side-of-body joint, you can transfer fuel between tanks to find out which tank has the leak.
(6) S 286-105Talcum powder is useful to find the external leak point when fuel is in the tank.
TO THE DYE PRESSURE CONNECTION OF THE SPECIAL LEAK TRACING DEVICE OR AN EQUIVALENT DEVICE
Hollow Bolt for Areas With Complex Structure Figure 616
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A
737-300/400/500MAINTENANCE MANUAL
S 286-106
(7) Find the external leak point first.
(a) The leak point can be hidden by aerodynamic gap seals.
NOTE: For example, the aerodynamic gap seal in a gap
____
between two lower wing skins.
(b) The leak point can be hidden by external structure with corrosion fay and fillet seals.
NOTE: An example is a fairing attach angle.
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