737 AMM 飞机维护手册 燃油 FUEL(89)

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2.  Equipment and Materials
A.  Leading Edge Flap Actuator Locks - F80048-89 (Preferred), F80048-90 (Preferred), F80048-84 (Alternate), and F80048-36 (Alternate)
B.  Wire puller, conduit
C.  Fuel Conduit Fill Kit P/N 08045-260 or 08045-265
D.  Dispensing Gun P/N 221828, 221830, 220847, or 229004
3.  Prepare for Removal
A.  Defuel and purge the applicable fuel tank (AMM 28-23-0/201 and AMM 28-10-0/201).
WARNING:  DO NOT COMPROMISE THE SAFETY PRECAUTIONS GIVEN FOR PURGING AND FUEL TANK ENTRY.
NOTE:  If maintenance is necessary on the float switch conduit for the center tank, you must defuel and purge both the center tank and tank No. 2.
B.  Extend the flaps and install the leading edge flap locks (AMM 27-81-0/201).
WARNING:  REFER TO AMM 27-81-0/201 FOR LOCK INSTALLATION PROCEDURE. FLAPS ARE FAST ACTING AND CAN CAUSE SERIOUS INJURY TO PERSONS.
C.  Make sure the fueling shutoff valves at the fueling station are closed.
D.  Disconnect external electrical power, if connected.
E.  Get access to float switches as follows (Fig. 401):
(1)  To get access to the float switch in tank No. 1 or 2, remove the fuel tank access panel  No. 11 (AMM 28-11-11/401).
May 01/03 28-21-71 Page 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

F95064 G43275 F95083
Fueling Float Switch Installation (Type I)  500 
28-21-71  Figure 401 (Sheet 1)  May 01/03 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

500  Fueling Float Switch Installation (Type I) 
May 01/03  Figure 401 (Sheet 2)  28-21-71 
Page 403 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

Fueling Float Switch Installation (Type I)  500 
28-21-71  Figure 401 (Sheet 3)  May 01/03 
Page 404 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

(2)  
To get access to the wing front spar out of the fuel tank, remove the slat access panel No. 6223/6523.

(3)  
On airplanes with removable fuel cells, to get access to the center tank, remove the access panel located in the bottom of cavity No. 1 followed by removal of fuel cell access panel as required to enter cell containing center tank float switch (AMM 28-12-21/401,  AMM 28-12-31/401).

(4)  
On airplanes with integral center tank, to get access to the center tank and float switch, remove the access panel in the bottom of cavity No. 1 (AMM 28-11-31/401).

4.  AIRPLANES WITH TYPE I FLOAT SWITCH; Remove the Fueling Float Switch
A.  Outside the fuel tank, separate the float switch wires from wire bundle, forward of front wing spar, and locate the splice (Fig. 401).
B.  Cut the wires at convenient point near splice allowing sufficient wire length to make new splice. Tag the wires for identification.
C.  If necessary to allow larger passage for pulling wire, remove the conduit nut, nylon grommet and rubber grommet (installed on wing tank float switch) from fitting on front spar (Detail A,  Fig. 401).
D.  Inside the fuel tank, unscrew the conduit nut at the base of the float switch.
E.  Unscrew float switch mounting nut. Lift switch up from bracket and out to the side allowing wires to pass through slot in bracket. Reinstall nut and washers loosely.
NOTE:  On some center tank installations, it is only necessary to loosen mounting nut to allow threaded base of switch to pass out through wide slot in bracket.
F. Hold or restrain the float switch from falling and pull the switch wires out through the conduit.
CAUTION:  IN CENTER TANK, USE CARE TO PREVENT DAMAGE TO CELL OR LOWER SKIN FROM FALLING TOOLS OR LOOSE TANK COMPONENTS.
NOTE:  Wires for center tank float switch are 22-24 feet long.
G.  Coil up the wire and remove the switch from the tank.
5C8 
May 01/03  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  28-21-71 Page 405 

H.  When it is necessary to remove the conduit for the fueling float switch in the wing tank, do the steps that follow:
(1)  
From out of the wing tank remove the bulkhead union nut.

NOTE:  Make sure the conduit is held from in the tank while the bulkhead union nut is removed. This is to prevent the conduit and the union from falling in the tank.

(2) 
 Remove the washer.

(3)  
From in the wing tank, remove the conduit nut at the bulkhead union.

(4)  
Remove the bulkhead union.
　
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