FUEL HEATER
FUEL INLET LINE
APU SHROUD
ADAPTER

SEE H FUEL HOSE
FWD
G
APU Fuel Feed Line Installation Figure 401 (Sheet 3)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
UPPER SHROUD TO APU

FUEL LINE SHROUD
APU SHROUD ADAPTER

APU Fuel Feed Line Installation
Figure 401 (Sheet 4)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
H47362
A
737-300/400/500MAINTENANCE MANUAL
 S 764-031
 (8)  Do a check of the electrical bond between the APU fuel line and the airplane structure (SWPM 20-20-00).
 (a)  The resistance must not be more than 0.010 ohm.
 S 794-032
 (9)  Pressurize the APU fuel line and do a check for leaks (air procedure).
 (a)  
Disconnect the fuel line from the suction port fitting.

 (b)  
Attach the air pressure source and the pressure gage to the suction port fitting.

 (c)  
Manually close the APU shutoff valve if it is open.

 (d)  
Pressurize the APU fuel line to a maximum of 40 psi.

 (e)  
Keep the pressure on the APU fuel line for a minimum of 5 minutes.

 (f)  
Look for signs of external leakage on all of the connections and the fittings on the APU fuel line.

 (g)  
The must be no leakage.

 (h)  
Release the pressure.

 (i)  
Remove the air source and the pressure gage.

 (j)  
Connect the APU fuel line to the suction port again.

 (k)  
Make sure the tube nuts are tight.

 S 864-034
 (10)
 Remove all of the tools and equipment from the fuel tanks.

 S 414-035

 (11)
 Install the access panel for the fuel tank (AMM 28-11-11/401).

 S 864-036

 (12)
 Open the removal valve for the left boost pump for the center tank.

 S 414-037

 (13)
 Install the access panel, 7201, for the boost pump.

 NOTE: Make sure the removal valve is open before you install the
____
 access panel.

 TASK 28-22-81-004-039
 4. APU Fuel Line Removal (the Part in the Center Section)
_____________________
 A. Equipment
 (1)  Container - to catch fuel
 B. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 28-10-00/201, Storage

 (3)  
AMM 28-11-11/401, Wing Fuel Tank Access Panels

 (4)  
AMM 28-11-31/401, Center Tank Access Door

 (5)  
AMM 28-23-00/201, Defueling

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 C. Access
 (1)  
Location Zones
 221 Center Section Fuel Tank
 305 Left Fuel Tank

 (2)  
Access Panel
 7202 Fuel Tank Access Door

 D. Procedure
 S 864-044
 (1)  
Connect the external electrical power to the airplane
 (AMM 24-22-00/201).

 S 864-041

 (2)  
Close the APU shutoff valve.

 S 654-045
 WARNING: CAREFULLY DO ALL OF THE SAFETY PROCEDURES TO DEFUEL THE FUEL
_______ TANK. AN EXPLOSION, BAD INJURIES TO PERSONS, AND DAMAGE TO EQUIPMENT CAN EASILY OCCUR.
 (3)  
　
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