49-51-00
 ALL  ú ú 01 Page 4 ú Mar 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
APU COOLING AIR SYSTEM - MAINTENANCE PRACTICES
______________________________________________
 1.  General
_______
 A.  This section gives the tasks to examine and to clean the cooling fan inlet screen (which is referred to as the 'fan inlet screen'). A removal of the fan inlet screen is not necessary to clean the fan inlet screen. To clean the fan inlet screen, use a movable vacuum cleaner with a minimum diameter of 1.0 inch (25 mm) flexible nozzle, or wash the screen with solvent.
 B.  The fan inlet screen is attached to the top of the cooling fan housing. The access to the fan inlet screen is through the inspection tube on the cooling air duct.
 C.  The cooling fan blows air through the crossover duct to cool the
 generator and the oil cooler.

 D.  A large quantity of blockage on the fan inlet screen will cause a high oil temperature. The high oil temperature will stop the APU automatically.
 TASK 49-51-00-202-001
 2.  Cooling Fan Inlet Screen Examination (Fig.____________________________________201)
 A.  Special Tools and Equipment
 (1)  F71336-501 - Horizontal Stabilizer Trim Lock
 B.  Standard Tools and Equipment
 (1)  Flashlight
 C.  Access
 (1)  
Location Zones
 101 Control Cabin (Left)
 205 Electronic Compartment
 701 Tail Compartment
 703 APU Compartment

 (2)  
Access Panels
 1201 Electronic Equipment Access Door
 3701 Stabilizer Trim Access Door
 3804 APU Cowl Door

 D.  Procedure
 S 862-002
 (1)  Set the switch and the circuit breakers:
 (a)  Set the APU master switch, on the P5 forward overhead panel, to the OFF position and attach a DO-NOT-OPERATE tag.
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 49-51-00
 ALL  ú ú 02 Page 201 ú Jul 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE A
FLIGHT COMPARTMENT
YOKE
STABILIZER
TRIM WHEEL

TRIM WHEEL CONTROL STAND
HANDLE
STABILIZER TRIM LOCK
A
Cooling Fan Inlet Screen Examination and Cleaning
Figure 201 (Sheet 1)

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 49-51-00
 ALL  ú ú 02 Page 202 ú Nov 15/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
G96119
SEE B
STABILIZER
JACKSCREW

STABILIZER TRIM 
ELECTRICAL ACTUATOR  ELECTRICAL 
CONNECTOR 
ELECTRICAL 
CONNECTOR 

AUTOPILOT STABILIZER TRIM SERVO
MANUAL TRIM DRIVE CABLE DRUM
B
Cooling Fan Inlet Screen Examination and Cleaning Figure 201 (Sheet 2)
G97848
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 49-51-00
 ALL  ú ú 01 Page 203 ú Nov 15/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
HORIZONTAL WEB LIGHTENING HOLES SEE C INSPECTION TUBE
ACCESS DOOR
D
FWD
CAP ASSEMBLY
INSPECTION TUBE SEE D
STABILIZER
JACKSCREW

FWD
C
Cooling Fan Inlet Screen Examination and Cleaning Figure 201 (Sheet 3)
K07656
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 49-51-00
　
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