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

 B. Procedure
 S 424-007
 (1)  Install the ignition unit:
 (a)  
Put the ignition unit, with a rubber pad, in its position on the support assembly.

 (b)  
Attach the ignition unit to the support assembly with the screws and the washers. 1) Tighten the screws to 20-25 pound-inches (2.3-2.9

 newton-meters).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 ////////////////////////
(c)  
Remove the caps from the electrical connector and the igniter cable.

 (d)  
Connect the electrical connector and the igniter cable to the ignition unit.

 (e)  
Install lockwire on the electrical connector and the igniter cable.

 S 414-008
 CAUTION: KEEP A MINIMUM CLEARANCE OF 0.18 INCHES (5 MM) BETWEEN THE
_______ ENGINE, THE FIRE DETECTOR, THE CLAMPS, AND THE LOWER SHROUD.
 BE CAREFUL WHEN YOU MOVE THE LOWER SHROUD.  DAMAGE TO THE
 SHROUD DRAIN LINES CAN OCCUR.
 (2)  Install the lower shroud: (a) Hold the lower shroud against the upper shroud. (b) Close the shroud latches.
 S 414-009
 (3)  Close the APU cowl door: (a) Disconnect the door support rods. (b) Put the door support rods in the clips on the APU cowl door. (c) Close the APU cowl door. (d) Close the latches on the APU cowl door.
 S 864-010
 (4)  Set the circuit breaker and the switch: (a) Remove the DO-NOT-CLOSE tag and close this circuit breaker: 1) E3-3 Electrical Shelf, APU Control Unit (b) Remove the DO-NOT-OPERATE tag from the APU master switch on the P5 forward overhead panel.

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IGNITER PLUG - REMOVAL/INSTALLATION
___________________________________
 1.  General_______
 A.  This procedure contains the removal and the installation tasks for the APU igniter plug.
 B.  The igniter plug is installed on the combustion chamber cap of the APU. The combustion chamber cap is on the bottom aft end of the APU. You can get access to the igniter plug through the APU cowl door.
 TASK 49-41-51-004-001
 2.  Igniter Plug 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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