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2)  Monitor the fuel heater for leakage for 5 minutes. a) If there is any leakage, repair the cause of it.
 (f)  
Manually close the APU fuel valve.

 (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 434-011
 (6)  
Install the APU (AMM 49-11-00/401).

 S 724-013

 (7)  
Do a test of the flow control valve (AMM 49-31-92/501).

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FUEL DRAIN - INSPECTION/CHECK
_____________________________
 1.  General
_______
 A.  This procedure gives the task to do the inspection of the fuel drain.
 APUs WITHOUT THE FUEL DRAIN HOUSING;
 The fuel drain system has the plenum union on the turbine plenum, drain
 tee, drain line and drain union on the combustion chamber cap.
 APUs WITH THE FUEL DRAIN HOUSING;
 The fuel drain system has the turbine plenum boss, fuel drain housing,
 drain line and drain reducer on the combustion chamber cap.

 TASK 49-31-71-206-021
 2.  Fuel Drain Inspection (APUs with the Fuel Drain Housing) (Fig. 601)
_____________________
 A.  Standard Tools and Equipment
 (1)  
Air Source - Compressed Dry

 (2)  
Vacuum Cleaner - to clean

 B.  Consumable Materials
 (1)  
B00722 Solvent - P-D-680

 (2)  
C00852 Compound - Antiseize, MIL-T-83483

 C.  Parts
 ~.............................................................................. | MM | | IPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 601 | 1 | Packing | 49-21-00 | 02 | 128 | | | 2 | Packing | | | 170 | 2.......….......…...................................…...........….....…........1
 D.  References
 (1)  AMM 49-31-42/401, Combustor Unit
 E.  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

 F.  Procedure
 S 866-022
 (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

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////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE B
SEE  A  UPPER SHROUD 
A 
TURBINE PLENUM 
HARNESS RESISTOR ENGINE 
CHAMBER CAP COMBUSTION  3  PLENUM UNION DRAIN TEE 
DRAIN UNION  DRAIN UNION B Figure 601 (Sheet 1) Fuel Drain - Inspection/Check DRAIN LINE 1  FWD 

A34914
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