B.  These are the aural and visual warnings which alert cabin attendants and flight crew in event of a lavatory fire:
 (1)  Lavatories:
 (a)  
A red alarm light on the smoke detector

 (b)  
A smoke detector horn in the lavatory.

 C.  Smoke detector switches
 (1)  Reset/Interrupt Switch
 (a)  When the Reset/Interrupt switch is pushed and released, all the alarm indications will reset, and the detector will return to the normal sampling mode if the smoke has cleared. If the smoke is not cleared, the alarm indications will restart.
 2.  Operation (Fig. 2)
_________
 A.  The detection system is activated automatically when power is applied to airplane and system circuit breaker is closed.
 B.  The smoke detector uses an ionization sensor to detect smoke. A very small amount of radioactive material ionizes the air between two electrodes allowing current to flow through the air between the electrodes. Any smoke particles present interfere with this current flow. The change in current flow is sensed by a current amplifier which outputs a signal to turn on the alarm indicators.
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A 737-300/400/500MAINTENANCE MANUAL

SWITCH INDICATOR LIGHT (GREEN)
LAVATORY SMOKE DETECTOR
A Lavatory Smoke Detection System - Component Location
Figure 1

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H43802
A 737-300/400/500MAINTENANCE MANUAL
Not Used
Figure 2

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H44211
A 737-300/400/500MAINTENANCE MANUAL
28V DC
BUS 1
PASS & CREW
CALL/LAV SMOKE
DETECTOR

P18-4 PASSENGER
ACCOMODATIONS

SMOKE DETECTORP18

LAVATORY (EXAMPLE)
Lavatory Smoke Detection System Schematic
Figure 3

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H44155
A
737-300/400/500MAINTENANCE MANUAL
 LAVATORY SMOKE DETECTION SYSTEM - ADJUSTMENT/TEST
_________________________________________________
 1.  General_______
 A.  This section contains procedures to do a test of the smoke detection system in the lavatory. This test will make sure the smoke detector sensor, annunciator, and interrupt functions operate correctly.
 (1)  The system test increases the function of the operational test to make sure all performance requirements of the system occur.
 TASK 26-14-00-735-053
 2.  System Test - Lavatory Smoke Detectors______________________________________
 A.  Equipment
 (1)  
Rosco Fog/Smoke Machine -Model 1600 or equivalent. Rosco Lavatories, Inc. 36 Bush Avenue Port Chester, NY 10573 Phone: 914-937-1300 FAX: 914-937-5984

 THIS IS THE PREFERRED SMOKE SOURCE

 (2)  
Ventilation Smoke Tube P/N 458481 or equivalent
 Mine Safety Appliance Co.

 P.O. Box 426
 Pittsburgh, PA 15230
 Phone: 412-967-3000
 FAX: 412-967-3161

 (3)  
　
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