(2)
25-21-45/401, Sculptured Ceiling Panel

 (3)
25-52-81/401, Bulkhead Lining

 C. Access
 (1)  
Location Zones
 101 Control Cabin - Left
 102 Control Cabin - Right
 107 Forward Half of Cabin
 108 Aft Half of Cabin
 210 Air Conditioning Distibution Bay
 212 Left Air Conditioning Equipment Bay
 214 Right Air Conditioning Equipment Bay

 (2)  
Access Panels
 3303L A/C Access Panel
 3403R A/C Access Panel

 D. Prepare for the Test
 S 865-153
 (1)
Supply electrical power (Ref 24-22-00/201).

 (2)
Open the access doors to the air conditioning bays.

 S 015-154
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
 S 015-155
 (3) Get access to the 190°F duct overheat switch for the control cabin:
 (a)  Remove the aft bulkhead lining in the forward cargo compartment (Ref 25-52-81/401).
 S 015-156
 (4)  Get access to the 190°F duct overheat switch for the passenger cabin:
 (a)  Remove the overhead ceiling panels in the passenger cabin which are near the forward edge of the right wing of the airplane (Ref 25-21-45/401).
 E. Thermal Test - 190°F Duct Overheat Switches
 NOTE: This test will make sure the 190°F duct overheat switch for the
____
 control cabin and the passenger cabin operates correctly.

 S 865-157
 (1)  Do these steps when you do the test to the 190°F duct overheat switch for the control cabin:
 (a)  
Disconnect the electrical connector, D486, from the left pack valve.

 (b)  
Move the L PACK switch to AUTO or HIGH, on the P5-10 panel.

 S 865-158
 (2)  Do these steps when you do the test to the 190°F duct overheat switch for the passenger cabin:
 (a)  
Disconnect the electrical connector, D490, from the right pack valve.

 (b)  
Move the R PACK switch to AUTO or HIGH, on the P5-10 panel.

 S 025-159
 (3)  
Remove the 190°F duct overheat switch for the control cabin, but do not disconnect the electrical wires from the switch.

 S 885-160

 (4)  
Use the specified heat source equipment to increase the temperature of the overheat switch probe to 190°F (88°C).

 S 215-194
 CAUTION: DO NOT LET THE TEMPERATURE OF THE OVERHEAT SWITCH PROBE GET
_______ HOTTER THAN 200 DEGREES F (93 DEGREES C). THIS CAN CAUSE DAMAGE TO THE OVERHEAT SWITCH.
 (5)  Make sure these lights come on when the temperature of the overheat switch probe gets to 190|10°F (88|5°C):
 (a)  
DUCT OVERHEAT light on the P5-17 panel

 (b)  
MASTER CAUTION and AIR COND annunciator lights on the P7 panel

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 ú  ALL  ú
 ú ú  ú 01.101 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.  Page 525Jul 12/02 

A
737-300/400/500MAINTENANCE MANUAL
 S 885-162
 (6)  
Remove the heat from the overheat switch probe.

 S 885-163

 (7)  
Let the overheat switch probe become cool.

 S 865-164

 (8)  
Push the TRIP RESET switch on the P5-10 panel.

 S 215-165

 (9)  
Make sure the DUCT OVERHEAT, MASTER CAUTION and AIR COND lights go off.

 S 425-166

 (10)
 Install the 190°F duct overheat switch to the air distribution manifold.

 S 865-167

 (11)
 Move the PACK switch to OFF, on the P5-10 panel.

 S 435-168

 (12)
 Connect the electrical connector D486 to the left pack valve.
　
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