26-15-14
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A
737-300/400/500MAINTENANCE MANUAL
 S 864-062
 (4)  Close the APU CONT and the APU FIRE PROTECTION DETECTION circuit breakers on the panel P6.
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A
737-300/400/500MAINTENANCE MANUAL
 CARGO COMPARTMENT SMOKE DETECTION SYSTEM - DESCRIPTION AND OPERATION
____________________________________________________________________
 1.  General_______
 A.  The cargo compartment smoke detection system is used to monitor smoke in the forward and aft cargo compartments. The system includes these parts:
 (1)  
Smoke Detectors

 (2)  
Cargo Electronic Units (CEU)

 (3)  
Cargo Fire Control Panel

 B.  The cargo compartment smoke detection system uses 28 VDC power. The power is supplied through the circuit breakers on the P6 or P18 panel.
 2.  Component Details (Fig 1)_________________
 A.  Cargo Smoke Detector
 (1)  
Cargo Smoke detectors are installed in the ceiling of the forward and aft cargo compartment. A screen is installed over the smoke detector to keep it from being damaged. The smoke detectors are controlled and monitored by the Cargo Electronic Units (CEUs). The smoke detectors send alarm signals and status signals to the CEUs.

 (2)  
The smoke detectors monitor the air for presence of smoke or equivalent contaminants. When the concentration of smoke gets to a preset threshold, the detector sends a signal to the applicable CEU.

 B.  Cargo Electronic Unit (CEU)
 (1)  
One Cargo Electronic Unit (CEU) is installed in the ceiling of each cargo compartment. An access panel is installed over the CEU to keep it from being damaged. The CEU in the aft cargo compartment controls and monitors the smoke detectors in the aft cargo compartment. The CEU in the forward cargo compartment controls and monitors the smoke detectors in the forward cargo compartment.

 (2)  
The CEU has two test buttons. The LAMP TEST button will make sure that all the indication lamps on the CEU will come on. The PRESS TO TEST button will initiate a signal to do a test of all the smoke detectors in its cargo compartment.

 (3)  
The CEU has lamps for each smoke detector in its cargo compartment. These lamps will illuminate under these situations:

 (a)  
System test initiated from the cockpit.

 (b)  
Local CEU test.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
MASTER CAUTION AND FIRE WARN LIGHTS (P7)
FIRE MASTER SEE A WARN CAUTION
BELL CUTOUT PUSH TO RESET
ENGINE AND APU FIRE CONTROL MODULE (P8)
SEE C
MASTER CAUTION AND FIRE WARN LIGHTS (P7) (EXAMPLE)
A
CARGO FIRE CONTROL PANEL (P8)
SEE B
FLIGHT COMPARTMENT
EXT DET SELECT FWD AFT NORM NORM DETECTOR A
BA
B FAULT
Cg g
FA I
R  FWD AFT DISCH
R
G TEST ARMED
EO
ARMEDARMED
DISCH
rr
CARGO FIRE CONTROL PANEL (P8)
B
OVHT DET OVHT DET
WHEEL
BELL CUTOUT
L BOTTLE R BOTTLE WELL
DISCHARGE DISCHARGE
AB

R AA
AB
ENGINES
FAULT
DISCH
NORMAL
DISCH NORMAL DISCH  E T XE
A
12
ENG 2ENG 1
L RTS
APU DET
LR
OVERHEATOVERHEAT
T
INOP
A
A RA
L
TEST
GG
F
FIRE SWITCHES
APU BOTTLE
IO FA
(FUEL SHUTOFF)DISCHARGED
NV IU
PULL WHEN ILLUMINATED
A
OH R
G
LOCK OVERRIDE: PRESS
L PT E
R
　
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