(g)  
Set the No. 1 AFT FUEL PUMP switch on the P5 forward overhead panel to the OFF position.

 (h)  
Loosen the plug on the fuel supply hose to release the fuel pressure. 1) Let the fuel from the fuel supply hose drain into the

 container.

 (i)  
Remove the plug from the fuel supply hose.

 (j)  
Remove the container with the fuel from below the fuel supply hose.

 (k)  
Remove the external electrical power from the airplane if it is not necessary (AMM 24-22-00/201).

 S 434-007
 (3)  Install the APU (AMM 49-11-00/401).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
FUEL SENSING FLOW CONTROL VALVE - REMOVAL/INSTALLATION
______________________________________________________
 1.  General
_______
 A.  This procedure contains the removal and the installation tasks for the control valve for the fuel sensing flow. During this procedure, the valve is referred to as the control valve.
 B.  The control valve is installed on a bracket on the upper shroud in the APU compartment. You can get access to the valve through the APU cowl door.
 TASK 49-31-92-004-001
 2.  Control Valve Removal (Fig. 401)
_____________________
 A.  References
 (1)  
AMM 26-15-14/401, APU Fire Detection Sensing Element

 (2)  
AMM 49-52-81/201, Overtemperature Control Switch

 B.  Access
 (1)  
Location Zones
 101 Control Cabin, LH
 205 Electronic Compartment
 703 APU Compartment

 (2)  
Access Panels
 1201 Electronic Equipment Access Door
 3804 APU Cowl Door

 C.  Procedure
 S 864-002
 (1)  Set the switch and the circuit breaker:
 (a)  
Set the APU master switch on the P5 forward overhead panel to the OFF position and attach a DO-NOT-OPERATE tag.

 (b)  
Open this circuit breaker and attach a DO-NOT-CLOSE tag: 1) E3-3 Electrical Shelf, APU Control Unit

 S 014-003
 (2)  Open the APU cowl door:
 (a)  Open the latches for the APU cowl door.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE B
SEE  A 
SHROUD UPPER  FUEL HEATER A 
CONTROL VALVE CSEE 
BLEED AIR FOR THE INLET LINE 
FUEL LINE 
B  BLEED AIR DUCT 
BRACKET 
LINE FUEL  (2 LOCATIONS) CLAMP SCREW, WASHER 
BLEED AIR FOR THE INLET LINE 
CONTROL VALVE 
C 
Fuel Sensing Flow Control Valve Installation Figure 401 

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
(b)  
Open the APU cowl door.

 (c)  
Connect the door support rods.

 S 014-004
 CAUTION:_______BE CAREFUL WHEN YOU MOVE THE LOWER SHROUD. DAMAGE TO THE SHROUD DRAIN LINES CAN OCCUR.
 (3)  Remove the lower shroud:
 (a)  
Hold the lower shroud and open the shroud latches.

 (b)  
Remove the lower shroud.

 S 014-005
 (4)  Get access to the control valve:
 (a)  
Remove the fire detection element for the APU (AMM 26-15-14/401).

 (b)  
　
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