49-31-31
 ALL  ú ú 01 Page 501 ú Jul 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
2) Replace the fuel solenoid valve (AMM 49-31-31/401). 3) Do the fuel solenoid valve test again.
 (c)  If the APU does shut down with the circuit breaker open, do the following: 1) Remove the DO-NOT-CLOSE tag and close this circuit breaker:
 a) E3-3 Electrical Shelf, APU Control Unit
 S 865-004
 (3)  Do the APU usual shutdown (AMM 49-11-00/201).
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 49-31-31
 ALL  ú ú 01 Page 502 ú Jul 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
COMBUSTOR UNIT - REMOVAL/INSTALLATION
_____________________________________
 1.  General_______
 A.  This procedure gives the tasks to remove and to install the combustor unit. The combustor unit has the igniter plug, fuel drain union, fuel atomizer, combustor chamber cap and combustion chamber. These components are removed and installed as a unit.
 TASK 49-31-42-004-001
 2.  Combustor Unit Removal (Fig. 401)______________________
 A.  Standard Tools and Equipment
 (1)  Container - for fuel
 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.

 (b)  
Open the APU cowl door.

 (c)  
Connect the door suppport 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.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 A
TURBINE PLENUM PACKING
COUPLING
COMBUSTION CHAMBER
CHAMBER CAP COMBUSTION 
IGNITER PLUG  FUEL ATOMIZER 
UNION FUEL DRAIN A  FWD  FUEL LINE FITTING 
Figure 401 (Sheet 1) Combustor Unit Installation 

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 49-31-42
 ALL  ú ú 01 Page 402 ú Nov 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
SEE B
SEE A
FWD
A
FUEL
SOLENOID
VALVE

ELECTRICAL ELECTRICAL
CONNECTOR CONNECTOR
FUEL CONTROL
UNIT

FWD FUEL
HIGH PRESSURE SOLENOID
FUEL

FUEL LINE VALVE CONTROL
INBD (TO FUEL ATOMIZER)
UNIT

HIGH PRESSURE FUEL LINE B 1 (TO FUEL ATOMIZER)
B2
1 AIRPLANES WITHOUT THE TAFCU
2 AIRPLANES WITH THE TAFCU
Combustor Unit Installation Figure 401 (Sheet 2)
G16266
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