S1 OVHT TEST SWITCH
L1 L33
P5-10 AIR CONDITIONING MODULE

Wing and Lower Aft Body Overheat Detection System Component Location

Figure 1 (Sheet 2)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
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 COMPARTMENT OVERHEAT ACCESSORY UNIT  ú ú 02 Page 6 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
28V DC
BAT BUS
C571

A AA A
MASTER CAUTION
MASTER
CAUTION
AIR COND

P6-3  CIRCUIT BREAKER
M488 RIGHT ENGM1204 RT WNG LE PANEL
STRUT CAVITYBLD AIR DUCTOVHT DET OVHT DET
TO
MASTERDIM &
D680
24

TEST
A2 RIGHT TEMPERATURE
CONTROL UNIT
A A
L3  RIGHT WING BODYOVERHEAT
23 S1 OVHT
M371 RIGHT WINGM269 RIGHT WINGTEST SW
K1 OVHT TEST RELAY
OVHT DET OVHT DET
INBOARD OUTBOARD
TO
P5-10  AIR
CONDITIONING

MASTER
DIM &TEST
PANEL
A A
L1  LEFT WING BODY
DET FAULT
OVERHEAT M356 RIGHT FWDM271 RIGHT AFT115V AC
ISOL CHECK
DS1  OVERHEAT LIGHT
A/C PACK A/C PACKTRANS BUS 1
NORM
P5-10 AIR CONDITIONING PANEL
C388

OVHT DET OVHT DET
DET CONT
CHECK
WING AND LWR
BODY OVHT

WHEEL WELL
A1 LEFT AND APU TEMP
28V DC

CONTROL UNIT
BAT BUS
C396
MASTER WARN

A AA A
S1 TEST SWITCH
& CONT
UP DET FAULT
P6-2 CIRCUIT BREAKER

SW1 ISOL CHECK
M487  LEFT ENGM1205 LT WNG LE
PANEL
SW2 NORM
STRUT BLD AIR DUCTSW3
DET CONT
CAVITY OVHT DETDN CHECK
OVHT DET
A
ADET FAULT
CONT
ISOL CHECK
UNIT
NORM
SW3
DET CONT
A A
M274 LEFT AFT M355LEFT FWD OVHT
CHECK
A/C PACK PACK BAY OVHT DET OVHT DETL SEC 5658AFT CARGO
M370  LEFT WINGM268 LEFT WING
INBOARD OUTBOARDDET
OVHT DET OVHT DET
KEEL

BEAM
DET

L WING
DET

AA
S2  TEST SWITCH
SW2 SW1
A/C PACK
M272 FORWARD
DET

KEELBEAM
AAOVHT DET
AADET FAULT
ISOL CHECK
M276  OVHT DET
NORM
OVERHEAT

COMPARTMENT
SEC 58
DET CONT
M273  AFT
CHECK KEELBEAMOVHT DET
UNIT
A
A  AA
S3  TEST SWITCH
M348  AFT CARGO M1147 AFT CARGOM347 AFT CARGO M275AFT OVHTCOMPT COMPT COMPT DET SEC 56
M237  COMPARTMENT OVERHEAT ACCESSORY UNIT (E3) OVHT DET OVHT DET OVHT DET
Wing and Lower Aft Body Overheat Detection System Simplified SchematicFigure 2 (Sheet 1)
A 737-300/400/500MAINTENANCE MANUAL
115V AC
TRANS C388
MASTER CAUTION
BUS 1 WHEEL WELL
A AA A
WING AND LWRBODY OVHT 28V DC
DUCT LEAKVOLTAGETO
M488  RIGHT ENGM1204 RT WNG LE
AND W/W
BAT BUS C396REGULATOR MASTER
STRUT CAVITY BLD AIR DUCT
POWER SUPPLY
MASTER WARN DIM &
OVHT DET OVHT DET
& CONT CARD
TESTP6-2 CIRCUIT BREAKER
PANEL
A A
L3  RIGHT WING BODYOVERHEAT
M371  RIGHT WINGM269 RIGHT WINGOVHT DETOVHT DET
INBOARD OUTBOARD
TO
MASTERDIM &TEST
A A
MICRO
FIRE/
FIRE/
PROCESSOR
OVHT
OVHT
L1  LEFT WING BODY
CONTROLLER
OVERHEAT
OUTPUT
INPUT
R2
M356 RIGHT FWDM271 RIGHT AFTP5-10 AIR CONDITIONING PANEL
LOGIC
LOGIC
A/C PACKA/C PACK
OVHT DET OVHT DET
K2 L OVHT
RELAY

A AA A
R
M487  LEFT ENGM1205 LT WNG LESTRUTBLD AIR DUCTCAVITYOVHT DET OVHT DET
A A
K6 R OVHT
RELAY

A A
M274  LEFT AFTM355 LEFT FWD
A/C PACKPACK BAY
MICRO
A
　
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