(2)
Gage - pressure, 0-20 to 0-50 psi (or equivalent)
(3)
Plug - BACP20AU8 or MS21913-8 (or equivalent), to plug the end of the conduit where the float switch was removed.
(4)
Valve - shut-off, to shut off the air supply
(5)
Plumbing - To connect the pressure gage and the valve to the float switch conduit and to an air supply. The thread on the conduit is 3/4 16.
B. Access
(1) Location Zones
302 Left Wing Outboard Leading Edge
402 Right Wing Outboard Leading Edge
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(2) Access Panels
7213 Fuel Tank Access Door (Left)
7413 Fuel Tank Access Door (Right)
6223 Slat Access Panel (Left)
6523 Slat Access Panel (Right)
C. Inspection Procedure - To be used with the float switch wiring inspection when the wiring is removed
S 486-031
(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.
S 766-036
(2)
Pressurize the electrical conduit to approximately 20 psi and shut-off the supply of air.
S 766-033
(3)
After 5 (five) minutes, with no supply of air, make sure the pressure gage does not show a decrease in pressure.
NOTE: You must connect the pressure gage so that is shows the
____ pressure in the electrical conduit, even when the air supply is shut-off.
S 766-034
(4)
If you find leakage, then you must replace the section of the electrical conduit where the leak is before the next flight.
S 766-035
(5)
If you do not find a leak, then it is not necessary to replace the electrical conduit immediately. But if you found indications of arcing (in the task, Fuel Float Switch Wiring Inspection), then refer to SB 28-1132 for more data about the necessary inspection intervals.
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D. Inspection Procedure - To be used when the wiring is not removed
S 766-032
(1) Do these steps to do an inspection for fuel leaks from the electrical conduit:
(a)
Fill the center tank with fuel.
(b)
Fill the No. 2 tank to a minimum of half full.
NOTE: After you finish this inspection but before you move
____ the airplane, move fuel between the tanks until the airplane is correctly balanced.
(c)
Wait for 5 (five) minutes and then make sure there is no fuel leakage from the electrical conduit at the front spar.
(d)
If you find leakage, then you must replace the section of the electrical conduit where the leak is before the next flight.
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FUELING FLOAT SWITCH FOR THE NO. 2 TANK (NO. 1 TANK OPPOSITE)
SEE B
ACCESS PANEL NO. 11
FUELING FLOAT
SWITCH FOR THE
CENTER TANK
SEE A
CONDUIT ROUTING
CONDUIT
FUELING FLOAT SWITCH
CONDUIT
FWD
CENTER TANK A
INBD
WING FRONT SPAR
WIRE SPLICES
FWD
NO. 2 TANK
B
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