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outboard.
Tank end ribs close the ends of each fuel tank. There is no fuel
flow through the tank end ribs.
Fuel Tank Locations
The side of body rib is rib 1. Main tank 1 is between rib 5 and rib
22. The location of main tank 2 is the same.
The center tank is between rib 5 in the left wing and rib 5 in the
right wing.
The surge tank for main tank 1 and main tank 2 is between rib 22
and rib 25.
Fuel Tank Access Panels
The fuel tank access panels attach to the bottom wing skin with
a clamp ring. An aluminum gasket supplies a proper fit and an
electrostatic bond.
Impact resistant fuel tank access panels are in areas that are
subject to impact damage. The three inboard fuel tank access
panels, on each wing, are impact resistant panels.
FUEL STORAGE - FUEL TANK ACCESS
EFFECTIVITY
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FUEL STORAGE - FUEL TANK ACCESS
EFFECTIVITY
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General
The sump drain valves let these drain from each fuel tank:
* Fuel
* Water
* Contamination.
Sump drain valves are at the low point of each tank. The sump
drain valves in these tanks attach to the bottom wing skin:
* Main tank 1
* Main tank 2
* Surge tank.
The sump drain valve in the center tank attaches to the lower
wing skin panel.
Component Location
The sump drain valve for main tank 1 and main tank 2 is
outboard of rib five.
The sump drain valve for the center tank is near the center of
the tank. You get to the sump drain valve from an access door
on the lower fuselage skin. The access door is between the two
air conditioning access doors.
The sump drain valve for the surge tanks is outboard of rib 22.
The sump drain valve is on the bottom of the wing.
Operation
The procedure to drain fluid from these tanks is the same:
* Main tank 1
* Main tank 2
* Surge tank.
To open the sump drain valve, push up on the center of the
valve. An internal spring closes the sump drain valve.
To drain fluid from the center tank, open the access door and
pull down on the rod. An internal spring closes the sump drain
valve.
Training Information Point
You can replace the primary seal of a main tank sump drain
valve by removing the valve core plug and valve poppet.
Defueling the main tank is not necessary. However, you must
defuel the tank if you need to replace the whole main tank drain
valve.
You may replace the center tank sump drain assembly without
defueling the center tank.
FUEL STORAGE - SUMP DRAIN VALVES
EFFECTIVITY
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FUEL STORAGE - SUMP DRAIN VALVES
EFFECTIVITY
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FUEL STORAGE - SUMP DRAIN VALVES
28-10-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The fuel vent system keeps the pressure of the fuel tanks near
the ambient pressure. Too large a pressure difference can
cause damage to the wing structure.
Drains let fuel in the vent system return to the tanks.
Flame arrestors make sure excessive heat does not enter the
fuel vent system. A clogged flame arrestor causes the pressure
relief valve in the surge tank to open. When open, the pressure
relief valve becomes another vent for the fuel vent system.
Component Locations
Stringers and the upper wing skin make the vent channels. The
vent channels have drain float valves in the center tank.
Vent tubes attach to vent channels. Each vent tube has a drain
float valve.
A fuel vent float valve is on the outboard fuel tank end rib in
main tank 1 and main tank 2.
A surge tank drain check valve is on the outboard fuel tank end
rib in main tank 1 and main tank 2.
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