(b)  
Put the door support rods in the clips on the APU cowl door.

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////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
(c)
Close the APU cowl door.

 (d)
Close the latches for the APU cowl door.

 S 864-022
 (12) Remove the DO-NOT-OPERATE tag from the APU master switch on the P5 forward overhead panel.
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FUEL HEATER - REMOVAL/INSTALLATION
__________________________________
 1.  General
_______
 A.  This procedure gives the tasks to remove and to install the fuel heater. The fuel heater is installed on the upper shroud. You must remove the APU to get access to the fuel heater.
 TASK 49-31-61-004-001
 2.  Fuel Heater Removal (Fig. 401)
___________________
 A.  Standard Tools and Equipment
 (1)  Container - for fuel, 1 U.S. gallon (4 liter) capacity
 B.  References
 (1)  AMM 49-11-00/401, APU Power Plant
 C.  Access
 (1)  
Location Zones
 703 APU Compartment

 (2)  
Access Panels
 3804 APU Cowl Door

 D.  Procedure
 S 034-002
 (1)  
Remove the APU power plant (AMM 49-11-00/401).

 S 034-003

 (2)  
Disconnect the fuel lines and the bleed air lines from the fuel heater:

 (a)  
Put a container below the fuel heater.

 (b)  
Disconnect the fuel inlet line from the check valve on the fuel heater.

 (c)  
Permit the fuel in the fuel inlet line to drain into the container.

 (d)  
Install a cap on the fuel inlet line.

 (e)  
Disconnect the fuel outlet line from the fuel heater.

 (f)  
Permit the fuel in the fuel outlet line to drain into the container.

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SEE B
SEE  A 
SHROUD UPPER  THE FUEL HEATER CHECK VALVE FOR CLAMP CSEE  A 
FUEL HEATER 
OVERBOARD DUMP LINE FOR THE BLEED AIR
FLOW CONTROL VALVE 
FUEL INLET LINE  THE BLEED AIR INLET LINE FOR 
FUEL HOSE  CHECK VALVE 
NUTPLATE  B  BLEED AIR DUCT 
UPPER SHROUD  (4 LOCATIONS) SPACER 
(2 LOCATIONS) CLAMP 
FUEL HEATER 
C (4 LOCATIONS) WASHER  (4 LOCATIONS) SCREW 
Figure 401 Fuel Heater Installation 

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(g)  
Install a cap on the fuel outlet line.

 (h)  
Disconnect the inlet line for the bleed air.

 (i)  
Install a cap on the inlet line for the bleed air.

 (j)  
Disconnect the overboard dump line for the bleed air from the fuel heater.
　
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