C

Cargo Bay Smoke Detection - Component Location
Figure 1 (Sheet 1)

G96415
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 PROTECTION SYSTEM  ú ú 01 Page 2 ú Jul 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
AFT CARGO 
COMPARTMENT 
FORWARD 
CARGO 
COMPARTMENT  SMOKE 
DETECTOR 
SEE  D 
SMOKE 
DETECTOR 
SEE  D 
CARGO 
CEILING 
(REF) 
SCREEN 

SMOKE DETECTOR
(EXAMPLE) D
Cargo Bay Smoke Detection - Component Location Figure 1 (Sheet 2)
G96419
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 PROTECTION SYSTEM  ú ú 01 Page 3 ú Nov 15/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (c)  
CEU lamp test.

 (d)  
Alarm indication from smoke detector.

 C. Cargo Fire Control Panel
 (1)  The Cargo Fire Control Panel is installed in the P5 or P8 panel in the Flight Compartment. The control panel is used to initiate a test of the cargo smoke detection system and to indicate when a failure or a smoke alarm has been initiated.
 (a)  
The TEST switch, on the control panel, will initiate a test of the cargo smoke detection system. The test will make sure that the Cargo Electronic Unit and the smoke detectors are operating correctly.

 (b)  
The DETECTOR FAULT light will come on whenever a smoke detector or a CEU has a power failure. The light will also come on if a detector fails to respond to the test.

 (c)  
The DET SELECT switches control whether the system will operate in dual loop mode or single loop mode. When the switch is in the NORM position, the system will operate in the dual loop mode. When the switch is in the A position or the B position, then the system will operate in the single loop mode.

 (d)  
The applicable FWD or AFT warning light (red) will come on when smoke is sensed in one of the cargo compartments.

 3.  Operation_________
 A. Functional Description (Fig 2)
 (1)  
The Cargo Smoke Detection System usually operates in the dual loop mode. In the dual loop mode, the two detectors in a loop must sense smoke before a smoke alarm is initiated. If one of the detectors in a loop fails, then the system will automatically change to the single loop mode. In the single loop mode, the smoke alarm will be initiated if only one smoke detector senses smoke.

 (2)  
When smoke is sensed in one of the cargo compartments, a smoke alarm signal will be initated by the Cargo Electronic Unit (CEU). The CEU will send the signal to the flight compartment and the following conditions will occur.

 (a)  
The applicable (FWD or AFT) ARM light (red), on the Cargo Fire Control panel, will come on.

 (b)  
The two FIRE WARN lights, on the Glareshield panel, P7, will come on.

 (c)  
The fire warning bell will sound.

 (3)  
If you push the BELL CUTOUT switch, on the Engine and APU Fire Control panel, P8, the fire warning bell will stop. Also, if you push one of the FIRE WARN lights or one of the MASTER CAUTION lights, then the bell will stop.

 (4)  
If a detector loses power, then the DETECTOR FAULT light will come on. The light on the Cargo Electronic Unit (CEU) will show which detector or wiring circuit failed. If the control panel is installed in the P5 panel, the MASTER CAUTION lights come on whenever the DETECTOR FAULT light comes on.

 (5)  
Fault and Fire Indications are shown in the table that follows:

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