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____ alarm indications require approximately 4 seconds to appear during wing and aft body overheat test.
 2.  Air Conditioning Module Components (Fig. 1)
__________________________________
 A.  Overheat Warning Lights
 (1)  
Two overheat warning lights are on the air conditioning module. Overheat will cause either the left or right overheat warning light and the master caution lights to illuminate.

 (2)  
The warning lights may be tested individually by a press-to-test feature or are tested when the master caution test switch is closed.

 B.  Test Switch
 (1)  A switch is provided for testing the wing and lower aft body overheat detection system. Pressing the test switch grounds the sensing elements. If all circuits are operating correctly, the overheat warning lights will illuminate.
 NOTE: On airplanes with the Fenwal M237 compartment overheat
____ accessory unit, the overheat warning indications require holding the test switch for approximately 4 seconds.
 C.  Master Caution Lights Control Section
 (1)  
The master caution lights control section provides control of the master caution lights and air condition annunciator light on the lightshield module P7.

 (2)  
When an overheat warning occurs, the compartment overheat accessory unit provides a ground to the control section. The ground completes switching circuits which allows the master caution lights and master caution air conditioning annunciator light on P7 to illuminate. Either master caution light may be pressed to reset the master caution lights and annunciator lights.

 3.  AIRPLANES WITH BOEING M237 COMPARTMENT OVERHEAT ACCESSORY UNIT; Compartment Overheat Accessory Unit Components (Fig. 2)
______________________________________________
 A.  The compartment overheat accessory unit is on electronic equipment rack E3 in the electronic compartment.
 B.  Temperature Control Units A1 and A2
 (1)  The temperature control units plug in to the accessory unit and are held in place by screws. Each control unit contains circuitry to continuously monitor sensing element resistance and provide an alarm signal when the element resistance drops to the trip level. When the overheat condition has passed, the system returns to its standby condition.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 01 Page 3 ú Jul 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

OVERHEAT DETECTORS  DETECTOR, OVERHEAT SECTION 58 
SEE  A  M276 
AFT CARGO 
AIR CONDITIONING  RIGHT AIR  COMPARTMENT 
MODULE (P5)  CONDITIONING PACK OVERHEAT  M347, M348, M1147 OVERHEAT DETECTORS, 
SEE  B  DETECTORS,  AFT 
M356, M271  KEEL BEAM 
OVERHEAT 
DETECTOR, 
BLEED AIR DUCT  M273 
RIGHT WING 
LEADING EDGE 
OVERHEAT DETECTOR, 
M1204 
RIGHT ENGINE 
STRUT CAVITY 
OVERHEAT DETECTOR, M488  SECTION 56 
OVERHEAT 
DETECTOR, 
M275 
RIGHT WING M269, M371 DETECTOR, OVERHEAT  FORWARD KEEL DETECTORS, BEAM OVERHEAT  DUCT LEFT BLEED AIR DETECTOR, EDGE OVERHEAT WING LEADING 
M272  LEFT WING  M1205 
OVERHEAT  LEFT ENGINE 
DETECTORS,  STRUT CAVITY 
M370, M268  OVERHEAT 
DETECTOR, 
LEFT AIR CONDITIONING  M487 
PACK OVERHEAT DETECTORS, 
M355, M274 
A 

Wing and Lower Aft Body Overheat Detector System - Component Location
Figure 1 (Sheet 1)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 01 Page 4 ú Nov 15/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

A DUAL BLEED B FULL OPEN RAM DOOR B RAM DOOR FULL OPEN 
WING RESET 0 OFF ON 1 OFF HIGH PACK TRIP OFF A WING-BODY OVERHEAT OFF ON APU 2 A BLEED TRIP OFF A PACK TRIP OFF A WING-BODY OVERHEAT A BLEED TRIP OFF A ANTI ICE WING ANTI ICE TRIP PSI 40 60 80 100 BLEED RECIRC FAN OFF TEST OVHT R PACKISOLATION OFF HIGH VALVE CLOSE AUTO OPEN L PACK AUTO AUTO AUTO 
　
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