28-21-71
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 FUELING FLOAT SWITCH - INSPECTION/CHECK
_______________________________________
 1.  General_______
 A.  This procedure contains these tasks:
 (1)  
Wing tank float switch inspection

 (2)  
Center tank fueling float switch wiring inspection

 (3)  
Center tank float switch electrical conduit inspection

 B.  The wire bundle that goes to the float switch in each fuel tank goes through a conduit with fuel-tight connections. It is necessary to do an inspection of the conduit in each wing tank regularly for signs of leakage. Water can collect in the conduit and freeze. This can cause damage to the conduit. If the conduit is filled with grease, this will prevent the collection of water in the conduit and subsequent damage (AMM 28-21-71/401).
 TASK 28-21-71-796-001
 2.  Wing Tank Float Switch Inspection_________________________________
 A.  Equipment
 (1)  
Tube - flexible, plastic, with 0.25 inch (6.4 millimeters) outer diameter or less

 (2)  
Source - vacuum, to remove accumulated water from the conduit (for example, a syringe)

 B.  References
 (1)  
AMM 12-11-00/301, Fuel Servicing

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 27-81-00/201, Leading Edge Flaps and Slats

 (4)  
AMM 28-10-00/201, Storage

 (5)  
AMM 28-11-11/401, Wing Fuel Tank Access Panels

 (6)  
AMM 28-21-71/401, Fueling Float Switch

 (7)  
AMM 28-23-00/201, Defueling

 C.  Access
 (1)  
Location Zones
 302 Left Wing Outboard Leading Edge
 402 Right Wing Outboard Leading Edge

 (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)

 D.  Procedure
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 28-21-71
 ALL  ú ú 01 Page 601 ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 866-002
 WARNING:_______ MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE
 AND TE FLAPS AND FLAP DRIVE MECHANISMS.  THE CONTROL SURFACES
 FOR THE TRAILING EDGE AND THE LEADING EDGE CAN EXTEND AND
 RETRACT QUICKLY.  THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO

 EQUIPMENT.
 (1)  Extend the leading edge flaps (AMM 27-81-00/201).
 S 496-003
 WARNING: MAKE SURE YOU CORRECTLY INSTALL THE LEADING EDGE FLAP
_______ AND SLAT LOCKS TO PREVENT ACCIDENTAL OPERATION OF THE LEADING EDGE FLAPS AND SLATS. THE LEADING EDGE FLAPS AND SLATS CAN MOVE QUICKLY. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (2)  
Install safety locks on the leading edge flaps (AMM 27-81-00/201).

 S 866-004

 (3)  
Make sure you close the fueling shutoff valves at the refuel station.

 S 656-013

 (4)  
Make sure there is sufficient fuel to fill one of the wing tanks (the No. 1 tank or the No. 2 tank) full of fuel (a minimum of approximately 1600 U. S. gallons).

 (a)  If there is not sufficient fuel, put the necessary quantity in the fuel tanks (AMM 12-11-00/301).
 S 866-014
 (5)  Make sure the fuel tank with the float switch that you will examine is filled to its capacity.
 (a)  If it is necessary, do this procedure: "Move the Fuel from a Tank to a Different Tank" (AMM 28-23-00/201).
 S 866-005
 (6)  
Remove the external electrical power if it is connected (AMM 24-22-00/201).

 S 016-007

 (7)  
Get access to the float switch wires at the wing front spar of the applicable fuel tank (Fig. 601).

 (a)  Remove the slat access panel.
 S 796-008
 (8)  Do a visual inspection of the bulkhead union for indications of fuel leakage.
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