(b)  
Install the caps on the igniter cable to prevent contamination.

 (c)  
Remove the igniter cable from the APU.

 TASK 49-41-52-404-007
 3.  Igniter Cable Installation (Fig. 401)
__________________________
 A.  Access
 (1)  
Location Zones
 101 Control Cabin (Left)
 205 Electronic Compartment
 703 APU Compartment

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

 B.  Procedure
 S 424-008
 (1)  Install the igniter cable to the APU:
 (a)  
Remove the caps from the igniter cable.

 (b)  
Connect the igniter cable to the ignition unit.

 1)  Install a lockwire between the ignition unit and the igniter cable.

 (c)  
Connect the igniter cable to the igniter plug on the combustion chamber cap. 1) Install a lockwire between the igniter plug and the igniter

 cable.
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 49-41-52
 ALL  ú ú 01 Page 403 ú Mar 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
S 414-009 CAUTION: KEEP A MINIMUM CLEARANCE OF 0.18 INCHES (5 MM) BETWEEN THE
_______ ENGINE, FIRE DETECTOR, CLAMPS AND 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 414-010
 (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 for the APU cowl door.
 S 864-011
 (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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 49-41-52
 ALL  ú ú 01 Page 404 ú Jul 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
APU COOLING AIR SYSTEM - DESCRIPTION AND OPERATION
__________________________________________________
 1.  General
_______
 A.  The cooling air system for the APU supplies the air to control the temperature of the APU electrical generator. It also supplies the air to control the temperature of the APU lubrication system, APU engine parts and APU shroud. The cooling air system has these components:
 (1)
the cooling air duct

 (2)
the shutoff valve

 (3)
the pneumatic actuator

 (4)
the cooling fan

 (5)
the crossover duct.

 2.  Cooling Air Inlet Duct (Fig. 1)
______________________
 A.  The cooling air duct supplies the stable air to the cooling fan when the airplane is on the ground. When the airplane is in flight, the cooling air duct supplies the ram air to the cooling fan. The cooling air duct is found between the torque box and the inlet flange of the cooling fan. The cooling air duct is connected to the upper shroud with rivets.
 B.  A cooling fan inlet screen (referred to as the fan inlet screen) attaches to the cooling fan inlet. An inspection tube and a cap assembly are attached to the cooling air duct for the inspection of the fan inlet screen. The inspection tube goes through a lightning hole in the horizontal web above the upper shroud.
 3.  Cooling Air Shutoff Valve (Fig. 1)
_________________________
 A.  The shutoff valve stops the airflow through the cooling air duct when the APU is stopped. Also, the shutoff valve will keep all flames in the APU shroud if an APU fire occurs. The shutoff valve has a butterfly that is installed on a shaft. The shutoff valve is installed in the cooling air duct. The pneumatic actuator controls the shutoff valve.
　
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