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A 737-300/400/500MAINTENANCE MANUAL
TASK 28-22-00-766-029
4. Electrical Conduit Leak Test
____________________________
A. Access
(1)
Location Zones
221 Center Section Fuel Tank
303 Left Wing Inboard Leading Edge
305 Left Fuel Tank
403 Right Wing Inboard Leading Edge
405 Right Fuel Tank
(2)
Access Panels
7201 Boost Pump Access Door
7203 Boost Pump Access Door
7401 Boost Pump Access Door
7403 Boost Pump Access Door
B. Procedure
S 016-039
(1)
Do the necessary steps to remove the wiring from the conduit in the task, Fuel Boost Pump Wiring Inspection.
S 766-030
(2)
Do one of these three tests to find if there is a leak in the electrical conduit:
(a) Test 1 1) Fill the applicable fuel tank with fuel. 2) After 5 minutes, make sure there is no sign of fuel leakage
at the ends of the electrical conduit.
3) Examine the end of the electrical conduit at the front spar and the end near the fuel boost pump for indications of fuel leakage.
(b) Test 2 1) Fill the applicable fuel tank with fuel. 2) Pull a clean cloth through the electrical conduit with the
string.
NOTE: Tie a second string to the cloth, so that you
____ will have a string available to pull the wire through the conduit for the wire installation.
3) Make sure there is no fuel on the cloth.
(c) Test 3
1) Use the necessary fittings to plug one end of the electrical conduit and to connect a pressure gage and air supply to the other end of the electrical conduit.
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2) 3) Pressurize the electrical conduit to 20 psi and shut-off the air supply.After 5 minutes with no supply of air, make sure the pressure shown on the pressure gage did not decrease.
NOTE:____ You must connect the pressure gage so that it reads the pressure in the electrical conduit even when the air supply is shut-off.
NOTE:____ You can do this test with any quantity of fuel in the tank.
(3) S 766-031If you do not find a leak (when you do one of the tests above) then it is not necessary to replace the electrical conduit immediately, but you must refer to SB 737-28-1120 for inspection requirements.
(4) S 766-032If you do find a leak (when you do one of the tests above) then you must replace the section of the electrical conduit where the leak is before the next flight.
(5) S 416-040Do the necessary steps to replace or re-install the wiring in the task, Fuel Boost Pump Wiring Inspection.
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A
737-300/400/500MAINTENANCE MANUAL
WIRING AT FRONT SPAR
SEE B
FUEL BOOST PUMP SEE A
ELECTRICAL CONNECTOR BOOST PUMP HOUSING
WING LOWER SURFACE ELECTRICAL CABLE
WIRE CLAMPS (SOME AIRPLANES HAVE ONLY ONE WIRE CLAMP)
ACCESS OPENING
FUEL BOOST PUMP (EXAMPLE) A HANDLE FOR THE PUMP REMOVAL VALVE
Fuel Boost Pump Wiring Inspection
Figure 601 (Sheet 1)
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K34635
A
737-300/400/500
MAINTENANCE MANUAL
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