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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
IGNITION UNIT - REMOVAL/INSTALLATION
____________________________________
 1.  General_______
 A.  This procedure contains the removal and the installation tasks for the ignition unit.
 B.  The ignition unit is on the bottom aft end of the APU. You can get access to the ignition unit through the APU cowl door.
 TASK 49-41-31-004-001
 2.  Ignition Unit Removal (Fig. 401)_____________________
 A.  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

 B.  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 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.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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
A 
ASSEMBLY SUPPORT 
(4 LOCATIONS) WASHER SCREW 
UNIT IGNITION  CABLE IGNITER CONNECTOR ELECTRICAL 
B  1  FWD 

SCREW 
WASHER 
(4 LOCATIONS) 
SUPPORT  ELECTRICAL 
ASSEMBLY  CONNECTOR 
IGNITER 
IGNITION  CABLE 
UNIT 
1  AIRPLANES WITHOUT THE ETC FWD 
B  2 
2  AIRPLANES WITH THE ETC 

Ignition Unit Installation
Figure 401

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
(b)  Remove the lower shroud.
 S 024-005
 (4)  Remove the ignition unit:
 WARNING: DO NOT TOUCH THE IGNITION COMPONENTS UNTIL YOU DO THESE
_______ STEPS. THESE STEPS WILL RELEASE THE HIGH VOLTAGE FROM THE IGNITION UNIT. IF YOU DO NOT OBEY THESE STEPS, INJURY TO PERSONS CAN OCCUR.
 (a)  
Release the voltage from the ignition unit: 1) Make sure 5 minutes have gone by since the last APU start. 2) Disconnect the igniter cable from the igniter plug. 3) Ground the igniter cable terminal to the APU engine. 4) Connect the igniter cable to the igniter plug.

 (b)  
Disconnect the electrical connector and the igniter cable from the ignition unit.

 (c)  
Install the caps on the electrical connector and the igniter cable.

 (d)  
Remove the screws and the washers that attach the ignition unit to the support assembly.

 (e)  
Remove the ignition unit from the support assembly.

 TASK 49-41-31-404-006
 3. Ignition Unit Installation (Fig. 401)
　
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